Add components

slider/node_modules/eslint/lib/linter/apply-disable-directives.js

@@ -0,0 +1,584 @@
+/**
+ * @fileoverview A module that filters reported problems based on `eslint-disable` and `eslint-enable` comments
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/** @typedef {import("../types").Linter.LintMessage} LintMessage */
+/** @typedef {import("@eslint/core").Language} Language */
+/** @typedef {import("@eslint/core").Position} Position */
+/** @typedef {import("@eslint/core").RulesConfig} RulesConfig */
+
+//------------------------------------------------------------------------------
+// Module Definition
+//------------------------------------------------------------------------------
+
+const escapeRegExp = require("escape-string-regexp");
+const { Config } = require("../config/config.js");
+
+/**
+ * Compares the locations of two objects in a source file
+ * @param {Position} itemA The first object
+ * @param {Position} itemB The second object
+ * @returns {number} A value less than 1 if itemA appears before itemB in the source file, greater than 1 if
+ * itemA appears after itemB in the source file, or 0 if itemA and itemB have the same location.
+ */
+function compareLocations(itemA, itemB) {
+	return itemA.line - itemB.line || itemA.column - itemB.column;
+}
+
+/**
+ * Groups a set of directives into sub-arrays by their parent comment.
+ * @param {Iterable<Directive>} directives Unused directives to be removed.
+ * @returns {Directive[][]} Directives grouped by their parent comment.
+ */
+function groupByParentDirective(directives) {
+	const groups = new Map();
+
+	for (const directive of directives) {
+		const {
+			unprocessedDirective: { parentDirective },
+		} = directive;
+
+		if (groups.has(parentDirective)) {
+			groups.get(parentDirective).push(directive);
+		} else {
+			groups.set(parentDirective, [directive]);
+		}
+	}
+
+	return [...groups.values()];
+}
+
+/**
+ * Creates removal details for a set of directives within the same comment.
+ * @param {Directive[]} directives Unused directives to be removed.
+ * @param {{node: Token, value: string}} parentDirective Data about the backing directive.
+ * @param {SourceCode} sourceCode The source code object for the file being linted.
+ * @returns {{ description, fix, unprocessedDirective }[]} Details for later creation of output Problems.
+ */
+function createIndividualDirectivesRemoval(
+	directives,
+	parentDirective,
+	sourceCode,
+) {
+	/*
+	 * Get the list of the rules text without any surrounding whitespace. In order to preserve the original
+	 * formatting, we don't want to change that whitespace.
+	 *
+	 *     // eslint-disable-line rule-one , rule-two , rule-three -- comment
+	 *                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+	 */
+	const listText = parentDirective.value.trim();
+
+	// Calculate where it starts in the source code text
+	const listStart = sourceCode.text.indexOf(
+		listText,
+		sourceCode.getRange(parentDirective.node)[0],
+	);
+
+	/*
+	 * We can assume that `listText` contains multiple elements.
+	 * Otherwise, this function wouldn't be called - if there is
+	 * only one rule in the list, then the whole comment must be removed.
+	 */
+
+	return directives.map(directive => {
+		const { ruleId } = directive;
+
+		const regex = new RegExp(
+			String.raw`(?:^|\s*,\s*)(?<quote>['"]?)${escapeRegExp(ruleId)}\k<quote>(?:\s*,\s*|$)`,
+			"u",
+		);
+		const match = regex.exec(listText);
+		const matchedText = match[0];
+		const matchStart = listStart + match.index;
+		const matchEnd = matchStart + matchedText.length;
+
+		const firstIndexOfComma = matchedText.indexOf(",");
+		const lastIndexOfComma = matchedText.lastIndexOf(",");
+
+		let removalStart, removalEnd;
+
+		if (firstIndexOfComma !== lastIndexOfComma) {
+			/*
+			 * Since there are two commas, this must one of the elements in the middle of the list.
+			 * Matched range starts where the previous rule name ends, and ends where the next rule name starts.
+			 *
+			 *     // eslint-disable-line rule-one , rule-two , rule-three -- comment
+			 *                                    ^^^^^^^^^^^^^^
+			 *
+			 * We want to remove only the content between the two commas, and also one of the commas.
+			 *
+			 *     // eslint-disable-line rule-one , rule-two , rule-three -- comment
+			 *                                     ^^^^^^^^^^^
+			 */
+			removalStart = matchStart + firstIndexOfComma;
+			removalEnd = matchStart + lastIndexOfComma;
+		} else {
+			/*
+			 * This is either the first element or the last element.
+			 *
+			 * If this is the first element, matched range starts where the first rule name starts
+			 * and ends where the second rule name starts. This is exactly the range we want
+			 * to remove so that the second rule name will start where the first one was starting
+			 * and thus preserve the original formatting.
+			 *
+			 *     // eslint-disable-line rule-one , rule-two , rule-three -- comment
+			 *                            ^^^^^^^^^^^
+			 *
+			 * Similarly, if this is the last element, we've already matched the range we want to
+			 * remove. The previous rule name will end where the last one was ending, relative
+			 * to the content on the right side.
+			 *
+			 *     // eslint-disable-line rule-one , rule-two , rule-three -- comment
+			 *                                               ^^^^^^^^^^^^^
+			 */
+			removalStart = matchStart;
+			removalEnd = matchEnd;
+		}
+
+		return {
+			description: `'${ruleId}'`,
+			fix: {
+				range: [removalStart, removalEnd],
+				text: "",
+			},
+			unprocessedDirective: directive.unprocessedDirective,
+		};
+	});
+}
+
+/**
+ * Creates a description of deleting an entire unused disable directive.
+ * @param {Directive[]} directives Unused directives to be removed.
+ * @param {Token} node The backing Comment token.
+ * @param {SourceCode} sourceCode The source code object for the file being linted.
+ * @returns {{ description, fix, unprocessedDirective }} Details for later creation of an output problem.
+ */
+function createDirectiveRemoval(directives, node, sourceCode) {
+	const range = sourceCode.getRange(node);
+	const ruleIds = directives
+		.filter(directive => directive.ruleId)
+		.map(directive => `'${directive.ruleId}'`);
+
+	return {
+		description:
+			ruleIds.length <= 2
+				? ruleIds.join(" or ")
+				: `${ruleIds.slice(0, ruleIds.length - 1).join(", ")}, or ${ruleIds.at(-1)}`,
+		fix: {
+			range,
+			text: " ",
+		},
+		unprocessedDirective: directives[0].unprocessedDirective,
+	};
+}
+
+/**
+ * Parses details from directives to create output Problems.
+ * @param {Iterable<Directive>} allDirectives Unused directives to be removed.
+ * @param {SourceCode} sourceCode The source code object for the file being linted.
+ * @returns {{ description, fix, unprocessedDirective }[]} Details for later creation of output Problems.
+ */
+function processUnusedDirectives(allDirectives, sourceCode) {
+	const directiveGroups = groupByParentDirective(allDirectives);
+
+	return directiveGroups.flatMap(directives => {
+		const { parentDirective } = directives[0].unprocessedDirective;
+		const remainingRuleIds = new Set(parentDirective.ruleIds);
+
+		for (const directive of directives) {
+			remainingRuleIds.delete(directive.ruleId);
+		}
+
+		return remainingRuleIds.size
+			? createIndividualDirectivesRemoval(
+					directives,
+					parentDirective,
+					sourceCode,
+				)
+			: [
+					createDirectiveRemoval(
+						directives,
+						parentDirective.node,
+						sourceCode,
+					),
+				];
+	});
+}
+
+/**
+ * Collect eslint-enable comments that are removing suppressions by eslint-disable comments.
+ * @param {Directive[]} directives The directives to check.
+ * @returns {Set<Directive>} The used eslint-enable comments
+ */
+function collectUsedEnableDirectives(directives) {
+	/**
+	 * A Map of `eslint-enable` keyed by ruleIds that may be marked as used.
+	 * If `eslint-enable` does not have a ruleId, the key will be `null`.
+	 * @type {Map<string|null, Directive>}
+	 */
+	const enabledRules = new Map();
+
+	/**
+	 * A Set of `eslint-enable` marked as used.
+	 * It is also the return value of `collectUsedEnableDirectives` function.
+	 * @type {Set<Directive>}
+	 */
+	const usedEnableDirectives = new Set();
+
+	/*
+	 * Checks the directives backwards to see if the encountered `eslint-enable` is used by the previous `eslint-disable`,
+	 * and if so, stores the `eslint-enable` in `usedEnableDirectives`.
+	 */
+	for (let index = directives.length - 1; index >= 0; index--) {
+		const directive = directives[index];
+
+		if (directive.type === "disable") {
+			if (enabledRules.size === 0) {
+				continue;
+			}
+			if (directive.ruleId === null) {
+				// If encounter `eslint-disable` without ruleId,
+				// mark all `eslint-enable` currently held in enabledRules as used.
+				// e.g.
+				//    /* eslint-disable */ <- current directive
+				//    /* eslint-enable rule-id1 */ <- used
+				//    /* eslint-enable rule-id2 */ <- used
+				//    /* eslint-enable */ <- used
+				for (const enableDirective of enabledRules.values()) {
+					usedEnableDirectives.add(enableDirective);
+				}
+				enabledRules.clear();
+			} else {
+				const enableDirective = enabledRules.get(directive.ruleId);
+
+				if (enableDirective) {
+					// If encounter `eslint-disable` with ruleId, and there is an `eslint-enable` with the same ruleId in enabledRules,
+					// mark `eslint-enable` with ruleId as used.
+					// e.g.
+					//    /* eslint-disable rule-id */ <- current directive
+					//    /* eslint-enable rule-id */ <- used
+					usedEnableDirectives.add(enableDirective);
+				} else {
+					const enabledDirectiveWithoutRuleId =
+						enabledRules.get(null);
+
+					if (enabledDirectiveWithoutRuleId) {
+						// If encounter `eslint-disable` with ruleId, and there is no `eslint-enable` with the same ruleId in enabledRules,
+						// mark `eslint-enable` without ruleId as used.
+						// e.g.
+						//    /* eslint-disable rule-id */ <- current directive
+						//    /* eslint-enable */ <- used
+						usedEnableDirectives.add(enabledDirectiveWithoutRuleId);
+					}
+				}
+			}
+		} else if (directive.type === "enable") {
+			if (directive.ruleId === null) {
+				// If encounter `eslint-enable` without ruleId, the `eslint-enable` that follows it are unused.
+				// So clear enabledRules.
+				// e.g.
+				//    /* eslint-enable */ <- current directive
+				//    /* eslint-enable rule-id *// <- unused
+				//    /* eslint-enable */ <- unused
+				enabledRules.clear();
+				enabledRules.set(null, directive);
+			} else {
+				enabledRules.set(directive.ruleId, directive);
+			}
+		}
+	}
+	return usedEnableDirectives;
+}
+
+/**
+ * This is the same as the exported function, except that it
+ * doesn't handle disable-line and disable-next-line directives, and it always reports unused
+ * disable directives.
+ * @param {Object} options options for applying directives. This is the same as the options
+ * for the exported function, except that `reportUnusedDisableDirectives` is not supported
+ * (this function always reports unused disable directives).
+ * @returns {{problems: LintMessage[], unusedDirectives: LintMessage[]}} An object with a list
+ * of problems (including suppressed ones) and unused eslint-disable directives
+ */
+function applyDirectives(options) {
+	const problems = [];
+	const usedDisableDirectives = new Set();
+	const { sourceCode } = options;
+
+	for (const problem of options.problems) {
+		let disableDirectivesForProblem = [];
+		let nextDirectiveIndex = 0;
+
+		while (
+			nextDirectiveIndex < options.directives.length &&
+			compareLocations(options.directives[nextDirectiveIndex], problem) <=
+				0
+		) {
+			const directive = options.directives[nextDirectiveIndex++];
+
+			if (
+				directive.ruleId === null ||
+				directive.ruleId === problem.ruleId
+			) {
+				switch (directive.type) {
+					case "disable":
+						disableDirectivesForProblem.push(directive);
+						break;
+
+					case "enable":
+						disableDirectivesForProblem = [];
+						break;
+
+					// no default
+				}
+			}
+		}
+
+		if (disableDirectivesForProblem.length > 0) {
+			const suppressions = disableDirectivesForProblem.map(directive => ({
+				kind: "directive",
+				justification: directive.unprocessedDirective.justification,
+			}));
+
+			if (problem.suppressions) {
+				problem.suppressions =
+					problem.suppressions.concat(suppressions);
+			} else {
+				problem.suppressions = suppressions;
+				usedDisableDirectives.add(disableDirectivesForProblem.at(-1));
+			}
+		}
+
+		problems.push(problem);
+	}
+
+	const unusedDisableDirectivesToReport = options.directives.filter(
+		directive =>
+			directive.type === "disable" &&
+			!usedDisableDirectives.has(directive) &&
+			!options.rulesToIgnore.has(directive.ruleId),
+	);
+
+	const unusedEnableDirectivesToReport = new Set(
+		options.directives.filter(
+			directive =>
+				directive.unprocessedDirective.type === "enable" &&
+				!options.rulesToIgnore.has(directive.ruleId),
+		),
+	);
+
+	/*
+	 * If directives has the eslint-enable directive,
+	 * check whether the eslint-enable comment is used.
+	 */
+	if (unusedEnableDirectivesToReport.size > 0) {
+		for (const directive of collectUsedEnableDirectives(
+			options.directives,
+		)) {
+			unusedEnableDirectivesToReport.delete(directive);
+		}
+	}
+
+	const processed = processUnusedDirectives(
+		unusedDisableDirectivesToReport,
+		sourceCode,
+	).concat(
+		processUnusedDirectives(unusedEnableDirectivesToReport, sourceCode),
+	);
+	const columnOffset = options.language.columnStart === 1 ? 0 : 1;
+	const lineOffset = options.language.lineStart === 1 ? 0 : 1;
+
+	const unusedDirectives = processed.map(
+		({ description, fix, unprocessedDirective }) => {
+			const { parentDirective, type, line, column } =
+				unprocessedDirective;
+
+			let message;
+
+			if (type === "enable") {
+				message = description
+					? `Unused eslint-enable directive (no matching eslint-disable directives were found for ${description}).`
+					: "Unused eslint-enable directive (no matching eslint-disable directives were found).";
+			} else {
+				message = description
+					? `Unused eslint-disable directive (no problems were reported from ${description}).`
+					: "Unused eslint-disable directive (no problems were reported).";
+			}
+
+			const loc = sourceCode.getLoc(parentDirective.node);
+
+			return {
+				ruleId: null,
+				message,
+				line:
+					type === "disable-next-line"
+						? loc.start.line + lineOffset
+						: line,
+				column:
+					type === "disable-next-line"
+						? loc.start.column + columnOffset
+						: column,
+				severity:
+					options.reportUnusedDisableDirectives === "warn" ? 1 : 2,
+				nodeType: null,
+				...(options.disableFixes ? {} : { fix }),
+			};
+		},
+	);
+
+	return { problems, unusedDirectives };
+}
+
+/**
+ * Given a list of directive comments (i.e. metadata about eslint-disable and eslint-enable comments) and a list
+ * of reported problems, adds the suppression information to the problems.
+ * @param {Object} options Information about directives and problems
+ * @param {Language} options.language The language being linted.
+ * @param {SourceCode} options.sourceCode The source code object for the file being linted.
+ * @param {{
+ *      type: ("disable"|"enable"|"disable-line"|"disable-next-line"),
+ *      ruleId: (string|null),
+ *      line: number,
+ *      column: number,
+ *      justification: string
+ * }} options.directives Directive comments found in the file, with one-based columns.
+ * Two directive comments can only have the same location if they also have the same type (e.g. a single eslint-disable
+ * comment for two different rules is represented as two directives).
+ * @param {{ruleId: (string|null), line: number, column: number}[]} options.problems
+ * A list of problems reported by rules, sorted by increasing location in the file, with one-based columns.
+ * @param {"off" | "warn" | "error"} options.reportUnusedDisableDirectives If `"warn"` or `"error"`, adds additional problems for unused directives
+ * @param {RulesConfig} options.configuredRules The rules configuration.
+ * @param {Function} options.ruleFilter A predicate function to filter which rules should be executed.
+ * @param {boolean} options.disableFixes If true, it doesn't make `fix` properties.
+ * @returns {{ruleId: (string|null), line: number, column: number, suppressions?: {kind: string, justification: string}}[]}
+ * An object with a list of reported problems, the suppressed of which contain the suppression information.
+ */
+module.exports = ({
+	language,
+	sourceCode,
+	directives,
+	disableFixes,
+	problems,
+	configuredRules,
+	ruleFilter,
+	reportUnusedDisableDirectives = "off",
+}) => {
+	const blockDirectives = directives
+		.filter(
+			directive =>
+				directive.type === "disable" || directive.type === "enable",
+		)
+		.map(directive =>
+			Object.assign({}, directive, { unprocessedDirective: directive }),
+		)
+		.sort(compareLocations);
+
+	const lineDirectives = directives
+		.flatMap(directive => {
+			switch (directive.type) {
+				case "disable":
+				case "enable":
+					return [];
+
+				case "disable-line":
+					return [
+						{
+							type: "disable",
+							line: directive.line,
+							column: 1,
+							ruleId: directive.ruleId,
+							unprocessedDirective: directive,
+						},
+						{
+							type: "enable",
+							line: directive.line + 1,
+							column: 0,
+							ruleId: directive.ruleId,
+							unprocessedDirective: directive,
+						},
+					];
+
+				case "disable-next-line":
+					return [
+						{
+							type: "disable",
+							line: directive.line + 1,
+							column: 1,
+							ruleId: directive.ruleId,
+							unprocessedDirective: directive,
+						},
+						{
+							type: "enable",
+							line: directive.line + 2,
+							column: 0,
+							ruleId: directive.ruleId,
+							unprocessedDirective: directive,
+						},
+					];
+
+				default:
+					throw new TypeError(
+						`Unrecognized directive type '${directive.type}'`,
+					);
+			}
+		})
+		.sort(compareLocations);
+
+	// This determines a list of rules that are not being run by the given ruleFilter, if present.
+	const rulesToIgnore =
+		configuredRules && ruleFilter
+			? new Set(
+					Object.keys(configuredRules).filter(ruleId => {
+						const severity = Config.getRuleNumericSeverity(
+							configuredRules[ruleId],
+						);
+
+						// Ignore for disabled rules.
+						if (severity === 0) {
+							return false;
+						}
+
+						return !ruleFilter({ severity, ruleId });
+					}),
+				)
+			: new Set();
+
+	// If no ruleId is supplied that means this directive is applied to all rules, so we can't determine if it's unused if any rules are filtered out.
+	if (rulesToIgnore.size > 0) {
+		rulesToIgnore.add(null);
+	}
+
+	const blockDirectivesResult = applyDirectives({
+		language,
+		sourceCode,
+		problems,
+		directives: blockDirectives,
+		disableFixes,
+		reportUnusedDisableDirectives,
+		rulesToIgnore,
+	});
+	const lineDirectivesResult = applyDirectives({
+		language,
+		sourceCode,
+		problems: blockDirectivesResult.problems,
+		directives: lineDirectives,
+		disableFixes,
+		reportUnusedDisableDirectives,
+		rulesToIgnore,
+	});
+
+	return reportUnusedDisableDirectives !== "off"
+		? lineDirectivesResult.problems
+				.concat(blockDirectivesResult.unusedDirectives)
+				.concat(lineDirectivesResult.unusedDirectives)
+				.sort(compareLocations)
+		: lineDirectivesResult.problems;
+};

slider/node_modules/eslint/lib/linter/code-path-analysis/code-path-analyzer.js

@@ -0,0 +1,828 @@
+/**
+ * @fileoverview A class of the code path analyzer.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("../../shared/assert"),
+	{ breakableTypePattern } = require("../../shared/ast-utils"),
+	CodePath = require("./code-path"),
+	CodePathSegment = require("./code-path-segment"),
+	IdGenerator = require("./id-generator"),
+	debug = require("./debug-helpers");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given node is a `case` node (not `default` node).
+ * @param {ASTNode} node A `SwitchCase` node to check.
+ * @returns {boolean} `true` if the node is a `case` node (not `default` node).
+ */
+function isCaseNode(node) {
+	return Boolean(node.test);
+}
+
+/**
+ * Checks if a given node appears as the value of a PropertyDefinition node.
+ * @param {ASTNode} node THe node to check.
+ * @returns {boolean} `true` if the node is a PropertyDefinition value,
+ *      false if not.
+ */
+function isPropertyDefinitionValue(node) {
+	const parent = node.parent;
+
+	return (
+		parent && parent.type === "PropertyDefinition" && parent.value === node
+	);
+}
+
+/**
+ * Checks whether the given logical operator is taken into account for the code
+ * path analysis.
+ * @param {string} operator The operator found in the LogicalExpression node
+ * @returns {boolean} `true` if the operator is "&&" or "||" or "??"
+ */
+function isHandledLogicalOperator(operator) {
+	return operator === "&&" || operator === "||" || operator === "??";
+}
+
+/**
+ * Checks whether the given assignment operator is a logical assignment operator.
+ * Logical assignments are taken into account for the code path analysis
+ * because of their short-circuiting semantics.
+ * @param {string} operator The operator found in the AssignmentExpression node
+ * @returns {boolean} `true` if the operator is "&&=" or "||=" or "??="
+ */
+function isLogicalAssignmentOperator(operator) {
+	return operator === "&&=" || operator === "||=" || operator === "??=";
+}
+
+/**
+ * Gets the label if the parent node of a given node is a LabeledStatement.
+ * @param {ASTNode} node A node to get.
+ * @returns {string|null} The label or `null`.
+ */
+function getLabel(node) {
+	if (node.parent.type === "LabeledStatement") {
+		return node.parent.label.name;
+	}
+	return null;
+}
+
+/**
+ * Checks whether or not a given logical expression node goes different path
+ * between the `true` case and the `false` case.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is a test of a choice statement.
+ */
+function isForkingByTrueOrFalse(node) {
+	const parent = node.parent;
+
+	switch (parent.type) {
+		case "ConditionalExpression":
+		case "IfStatement":
+		case "WhileStatement":
+		case "DoWhileStatement":
+		case "ForStatement":
+			return parent.test === node;
+
+		case "LogicalExpression":
+			return isHandledLogicalOperator(parent.operator);
+
+		case "AssignmentExpression":
+			return isLogicalAssignmentOperator(parent.operator);
+
+		default:
+			return false;
+	}
+}
+
+/**
+ * Gets the boolean value of a given literal node.
+ *
+ * This is used to detect infinity loops (e.g. `while (true) {}`).
+ * Statements preceded by an infinity loop are unreachable if the loop didn't
+ * have any `break` statement.
+ * @param {ASTNode} node A node to get.
+ * @returns {boolean|undefined} a boolean value if the node is a Literal node,
+ *   otherwise `undefined`.
+ */
+function getBooleanValueIfSimpleConstant(node) {
+	if (node.type === "Literal") {
+		return Boolean(node.value);
+	}
+	return void 0;
+}
+
+/**
+ * Checks that a given identifier node is a reference or not.
+ *
+ * This is used to detect the first throwable node in a `try` block.
+ * @param {ASTNode} node An Identifier node to check.
+ * @returns {boolean} `true` if the node is a reference.
+ */
+function isIdentifierReference(node) {
+	const parent = node.parent;
+
+	switch (parent.type) {
+		case "LabeledStatement":
+		case "BreakStatement":
+		case "ContinueStatement":
+		case "ArrayPattern":
+		case "RestElement":
+		case "ImportSpecifier":
+		case "ImportDefaultSpecifier":
+		case "ImportNamespaceSpecifier":
+		case "CatchClause":
+			return false;
+
+		case "FunctionDeclaration":
+		case "FunctionExpression":
+		case "ArrowFunctionExpression":
+		case "ClassDeclaration":
+		case "ClassExpression":
+		case "VariableDeclarator":
+			return parent.id !== node;
+
+		case "Property":
+		case "PropertyDefinition":
+		case "MethodDefinition":
+			return parent.key !== node || parent.computed || parent.shorthand;
+
+		case "AssignmentPattern":
+			return parent.key !== node;
+
+		default:
+			return true;
+	}
+}
+
+/**
+ * Updates the current segment with the head segment.
+ * This is similar to local branches and tracking branches of git.
+ *
+ * To separate the current and the head is in order to not make useless segments.
+ *
+ * In this process, both "onCodePathSegmentStart" and "onCodePathSegmentEnd"
+ * events are fired.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function forwardCurrentToHead(analyzer, node) {
+	const codePath = analyzer.codePath;
+	const state = CodePath.getState(codePath);
+	const currentSegments = state.currentSegments;
+	const headSegments = state.headSegments;
+	const end = Math.max(currentSegments.length, headSegments.length);
+	let i, currentSegment, headSegment;
+
+	// Fires leaving events.
+	for (i = 0; i < end; ++i) {
+		currentSegment = currentSegments[i];
+		headSegment = headSegments[i];
+
+		if (currentSegment !== headSegment && currentSegment) {
+			const eventName = currentSegment.reachable
+				? "onCodePathSegmentEnd"
+				: "onUnreachableCodePathSegmentEnd";
+
+			debug.dump(`${eventName} ${currentSegment.id}`);
+
+			analyzer.emit(eventName, [currentSegment, node]);
+		}
+	}
+
+	// Update state.
+	state.currentSegments = headSegments;
+
+	// Fires entering events.
+	for (i = 0; i < end; ++i) {
+		currentSegment = currentSegments[i];
+		headSegment = headSegments[i];
+
+		if (currentSegment !== headSegment && headSegment) {
+			const eventName = headSegment.reachable
+				? "onCodePathSegmentStart"
+				: "onUnreachableCodePathSegmentStart";
+
+			debug.dump(`${eventName} ${headSegment.id}`);
+			CodePathSegment.markUsed(headSegment);
+			analyzer.emit(eventName, [headSegment, node]);
+		}
+	}
+}
+
+/**
+ * Updates the current segment with empty.
+ * This is called at the last of functions or the program.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function leaveFromCurrentSegment(analyzer, node) {
+	const state = CodePath.getState(analyzer.codePath);
+	const currentSegments = state.currentSegments;
+
+	for (let i = 0; i < currentSegments.length; ++i) {
+		const currentSegment = currentSegments[i];
+		const eventName = currentSegment.reachable
+			? "onCodePathSegmentEnd"
+			: "onUnreachableCodePathSegmentEnd";
+
+		debug.dump(`${eventName} ${currentSegment.id}`);
+
+		analyzer.emit(eventName, [currentSegment, node]);
+	}
+
+	state.currentSegments = [];
+}
+
+/**
+ * Updates the code path due to the position of a given node in the parent node
+ * thereof.
+ *
+ * For example, if the node is `parent.consequent`, this creates a fork from the
+ * current path.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function preprocess(analyzer, node) {
+	const codePath = analyzer.codePath;
+	const state = CodePath.getState(codePath);
+	const parent = node.parent;
+
+	switch (parent.type) {
+		// The `arguments.length == 0` case is in `postprocess` function.
+		case "CallExpression":
+			if (
+				parent.optional === true &&
+				parent.arguments.length >= 1 &&
+				parent.arguments[0] === node
+			) {
+				state.makeOptionalRight();
+			}
+			break;
+		case "MemberExpression":
+			if (parent.optional === true && parent.property === node) {
+				state.makeOptionalRight();
+			}
+			break;
+
+		case "LogicalExpression":
+			if (
+				parent.right === node &&
+				isHandledLogicalOperator(parent.operator)
+			) {
+				state.makeLogicalRight();
+			}
+			break;
+
+		case "AssignmentExpression":
+			if (
+				parent.right === node &&
+				isLogicalAssignmentOperator(parent.operator)
+			) {
+				state.makeLogicalRight();
+			}
+			break;
+
+		case "ConditionalExpression":
+		case "IfStatement":
+			/*
+			 * Fork if this node is at `consequent`/`alternate`.
+			 * `popForkContext()` exists at `IfStatement:exit` and
+			 * `ConditionalExpression:exit`.
+			 */
+			if (parent.consequent === node) {
+				state.makeIfConsequent();
+			} else if (parent.alternate === node) {
+				state.makeIfAlternate();
+			}
+			break;
+
+		case "SwitchCase":
+			if (parent.consequent[0] === node) {
+				state.makeSwitchCaseBody(false, !parent.test);
+			}
+			break;
+
+		case "TryStatement":
+			if (parent.handler === node) {
+				state.makeCatchBlock();
+			} else if (parent.finalizer === node) {
+				state.makeFinallyBlock();
+			}
+			break;
+
+		case "WhileStatement":
+			if (parent.test === node) {
+				state.makeWhileTest(getBooleanValueIfSimpleConstant(node));
+			} else {
+				assert(parent.body === node);
+				state.makeWhileBody();
+			}
+			break;
+
+		case "DoWhileStatement":
+			if (parent.body === node) {
+				state.makeDoWhileBody();
+			} else {
+				assert(parent.test === node);
+				state.makeDoWhileTest(getBooleanValueIfSimpleConstant(node));
+			}
+			break;
+
+		case "ForStatement":
+			if (parent.test === node) {
+				state.makeForTest(getBooleanValueIfSimpleConstant(node));
+			} else if (parent.update === node) {
+				state.makeForUpdate();
+			} else if (parent.body === node) {
+				state.makeForBody();
+			}
+			break;
+
+		case "ForInStatement":
+		case "ForOfStatement":
+			if (parent.left === node) {
+				state.makeForInOfLeft();
+			} else if (parent.right === node) {
+				state.makeForInOfRight();
+			} else {
+				assert(parent.body === node);
+				state.makeForInOfBody();
+			}
+			break;
+
+		case "AssignmentPattern":
+			/*
+			 * Fork if this node is at `right`.
+			 * `left` is executed always, so it uses the current path.
+			 * `popForkContext()` exists at `AssignmentPattern:exit`.
+			 */
+			if (parent.right === node) {
+				state.pushForkContext();
+				state.forkBypassPath();
+				state.forkPath();
+			}
+			break;
+
+		default:
+			break;
+	}
+}
+
+/**
+ * Updates the code path due to the type of a given node in entering.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function processCodePathToEnter(analyzer, node) {
+	let codePath = analyzer.codePath;
+	let state = codePath && CodePath.getState(codePath);
+	const parent = node.parent;
+
+	/**
+	 * Creates a new code path and trigger the onCodePathStart event
+	 * based on the currently selected node.
+	 * @param {string} origin The reason the code path was started.
+	 * @returns {void}
+	 */
+	function startCodePath(origin) {
+		if (codePath) {
+			// Emits onCodePathSegmentStart events if updated.
+			forwardCurrentToHead(analyzer, node);
+			debug.dumpState(node, state, false);
+		}
+
+		// Create the code path of this scope.
+		codePath = analyzer.codePath = new CodePath({
+			id: analyzer.idGenerator.next(),
+			origin,
+			upper: codePath,
+			onLooped: analyzer.onLooped,
+		});
+		state = CodePath.getState(codePath);
+
+		// Emits onCodePathStart events.
+		debug.dump(`onCodePathStart ${codePath.id}`);
+		analyzer.emit("onCodePathStart", [codePath, node]);
+	}
+
+	/*
+	 * Special case: The right side of class field initializer is considered
+	 * to be its own function, so we need to start a new code path in this
+	 * case.
+	 */
+	if (isPropertyDefinitionValue(node)) {
+		startCodePath("class-field-initializer");
+
+		/*
+		 * Intentional fall through because `node` needs to also be
+		 * processed by the code below. For example, if we have:
+		 *
+		 * class Foo {
+		 *     a = () => {}
+		 * }
+		 *
+		 * In this case, we also need start a second code path.
+		 */
+	}
+
+	switch (node.type) {
+		case "Program":
+			startCodePath("program");
+			break;
+
+		case "FunctionDeclaration":
+		case "FunctionExpression":
+		case "ArrowFunctionExpression":
+			startCodePath("function");
+			break;
+
+		case "StaticBlock":
+			startCodePath("class-static-block");
+			break;
+
+		case "ChainExpression":
+			state.pushChainContext();
+			break;
+		case "CallExpression":
+			if (node.optional === true) {
+				state.makeOptionalNode();
+			}
+			break;
+		case "MemberExpression":
+			if (node.optional === true) {
+				state.makeOptionalNode();
+			}
+			break;
+
+		case "LogicalExpression":
+			if (isHandledLogicalOperator(node.operator)) {
+				state.pushChoiceContext(
+					node.operator,
+					isForkingByTrueOrFalse(node),
+				);
+			}
+			break;
+
+		case "AssignmentExpression":
+			if (isLogicalAssignmentOperator(node.operator)) {
+				state.pushChoiceContext(
+					node.operator.slice(0, -1), // removes `=` from the end
+					isForkingByTrueOrFalse(node),
+				);
+			}
+			break;
+
+		case "ConditionalExpression":
+		case "IfStatement":
+			state.pushChoiceContext("test", false);
+			break;
+
+		case "SwitchStatement":
+			state.pushSwitchContext(
+				node.cases.some(isCaseNode),
+				getLabel(node),
+			);
+			break;
+
+		case "TryStatement":
+			state.pushTryContext(Boolean(node.finalizer));
+			break;
+
+		case "SwitchCase":
+			/*
+			 * Fork if this node is after the 2st node in `cases`.
+			 * It's similar to `else` blocks.
+			 * The next `test` node is processed in this path.
+			 */
+			if (parent.discriminant !== node && parent.cases[0] !== node) {
+				state.forkPath();
+			}
+			break;
+
+		case "WhileStatement":
+		case "DoWhileStatement":
+		case "ForStatement":
+		case "ForInStatement":
+		case "ForOfStatement":
+			state.pushLoopContext(node.type, getLabel(node));
+			break;
+
+		case "LabeledStatement":
+			if (!breakableTypePattern.test(node.body.type)) {
+				state.pushBreakContext(false, node.label.name);
+			}
+			break;
+
+		default:
+			break;
+	}
+
+	// Emits onCodePathSegmentStart events if updated.
+	forwardCurrentToHead(analyzer, node);
+	debug.dumpState(node, state, false);
+}
+
+/**
+ * Updates the code path due to the type of a given node in leaving.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function processCodePathToExit(analyzer, node) {
+	const codePath = analyzer.codePath;
+	const state = CodePath.getState(codePath);
+	let dontForward = false;
+
+	switch (node.type) {
+		case "ChainExpression":
+			state.popChainContext();
+			break;
+
+		case "IfStatement":
+		case "ConditionalExpression":
+			state.popChoiceContext();
+			break;
+
+		case "LogicalExpression":
+			if (isHandledLogicalOperator(node.operator)) {
+				state.popChoiceContext();
+			}
+			break;
+
+		case "AssignmentExpression":
+			if (isLogicalAssignmentOperator(node.operator)) {
+				state.popChoiceContext();
+			}
+			break;
+
+		case "SwitchStatement":
+			state.popSwitchContext();
+			break;
+
+		case "SwitchCase":
+			/*
+			 * This is the same as the process at the 1st `consequent` node in
+			 * `preprocess` function.
+			 * Must do if this `consequent` is empty.
+			 */
+			if (node.consequent.length === 0) {
+				state.makeSwitchCaseBody(true, !node.test);
+			}
+			if (state.forkContext.reachable) {
+				dontForward = true;
+			}
+			break;
+
+		case "TryStatement":
+			state.popTryContext();
+			break;
+
+		case "BreakStatement":
+			forwardCurrentToHead(analyzer, node);
+			state.makeBreak(node.label && node.label.name);
+			dontForward = true;
+			break;
+
+		case "ContinueStatement":
+			forwardCurrentToHead(analyzer, node);
+			state.makeContinue(node.label && node.label.name);
+			dontForward = true;
+			break;
+
+		case "ReturnStatement":
+			forwardCurrentToHead(analyzer, node);
+			state.makeReturn();
+			dontForward = true;
+			break;
+
+		case "ThrowStatement":
+			forwardCurrentToHead(analyzer, node);
+			state.makeThrow();
+			dontForward = true;
+			break;
+
+		case "Identifier":
+			if (isIdentifierReference(node)) {
+				state.makeFirstThrowablePathInTryBlock();
+				dontForward = true;
+			}
+			break;
+
+		case "CallExpression":
+		case "ImportExpression":
+		case "MemberExpression":
+		case "NewExpression":
+		case "YieldExpression":
+			state.makeFirstThrowablePathInTryBlock();
+			break;
+
+		case "WhileStatement":
+		case "DoWhileStatement":
+		case "ForStatement":
+		case "ForInStatement":
+		case "ForOfStatement":
+			state.popLoopContext();
+			break;
+
+		case "AssignmentPattern":
+			state.popForkContext();
+			break;
+
+		case "LabeledStatement":
+			if (!breakableTypePattern.test(node.body.type)) {
+				state.popBreakContext();
+			}
+			break;
+
+		default:
+			break;
+	}
+
+	// Emits onCodePathSegmentStart events if updated.
+	if (!dontForward) {
+		forwardCurrentToHead(analyzer, node);
+	}
+	debug.dumpState(node, state, true);
+}
+
+/**
+ * Updates the code path to finalize the current code path.
+ * @param {CodePathAnalyzer} analyzer The instance.
+ * @param {ASTNode} node The current AST node.
+ * @returns {void}
+ */
+function postprocess(analyzer, node) {
+	/**
+	 * Ends the code path for the current node.
+	 * @returns {void}
+	 */
+	function endCodePath() {
+		let codePath = analyzer.codePath;
+
+		// Mark the current path as the final node.
+		CodePath.getState(codePath).makeFinal();
+
+		// Emits onCodePathSegmentEnd event of the current segments.
+		leaveFromCurrentSegment(analyzer, node);
+
+		// Emits onCodePathEnd event of this code path.
+		debug.dump(`onCodePathEnd ${codePath.id}`);
+		analyzer.emit("onCodePathEnd", [codePath, node]);
+		debug.dumpDot(codePath);
+
+		codePath = analyzer.codePath = analyzer.codePath.upper;
+		if (codePath) {
+			debug.dumpState(node, CodePath.getState(codePath), true);
+		}
+	}
+
+	switch (node.type) {
+		case "Program":
+		case "FunctionDeclaration":
+		case "FunctionExpression":
+		case "ArrowFunctionExpression":
+		case "StaticBlock": {
+			endCodePath();
+			break;
+		}
+
+		// The `arguments.length >= 1` case is in `preprocess` function.
+		case "CallExpression":
+			if (node.optional === true && node.arguments.length === 0) {
+				CodePath.getState(analyzer.codePath).makeOptionalRight();
+			}
+			break;
+
+		default:
+			break;
+	}
+
+	/*
+	 * Special case: The right side of class field initializer is considered
+	 * to be its own function, so we need to end a code path in this
+	 * case.
+	 *
+	 * We need to check after the other checks in order to close the
+	 * code paths in the correct order for code like this:
+	 *
+	 *
+	 * class Foo {
+	 *     a = () => {}
+	 * }
+	 *
+	 * In this case, The ArrowFunctionExpression code path is closed first
+	 * and then we need to close the code path for the PropertyDefinition
+	 * value.
+	 */
+	if (isPropertyDefinitionValue(node)) {
+		endCodePath();
+	}
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * The class to analyze code paths.
+ * This class implements the EventGenerator interface.
+ */
+class CodePathAnalyzer {
+	/**
+	 * @param {EventGenerator} eventGenerator An event generator to wrap.
+	 */
+	constructor(eventGenerator) {
+		this.original = eventGenerator;
+		this.emit = eventGenerator.emit;
+		this.codePath = null;
+		this.idGenerator = new IdGenerator("s");
+		this.currentNode = null;
+		this.onLooped = this.onLooped.bind(this);
+	}
+
+	/**
+	 * Does the process to enter a given AST node.
+	 * This updates state of analysis and calls `enterNode` of the wrapped.
+	 * @param {ASTNode} node A node which is entering.
+	 * @returns {void}
+	 */
+	enterNode(node) {
+		this.currentNode = node;
+
+		// Updates the code path due to node's position in its parent node.
+		if (node.parent) {
+			preprocess(this, node);
+		}
+
+		/*
+		 * Updates the code path.
+		 * And emits onCodePathStart/onCodePathSegmentStart events.
+		 */
+		processCodePathToEnter(this, node);
+
+		// Emits node events.
+		this.original.enterNode(node);
+
+		this.currentNode = null;
+	}
+
+	/**
+	 * Does the process to leave a given AST node.
+	 * This updates state of analysis and calls `leaveNode` of the wrapped.
+	 * @param {ASTNode} node A node which is leaving.
+	 * @returns {void}
+	 */
+	leaveNode(node) {
+		this.currentNode = node;
+
+		/*
+		 * Updates the code path.
+		 * And emits onCodePathStart/onCodePathSegmentStart events.
+		 */
+		processCodePathToExit(this, node);
+
+		// Emits node events.
+		this.original.leaveNode(node);
+
+		// Emits the last onCodePathStart/onCodePathSegmentStart events.
+		postprocess(this, node);
+
+		this.currentNode = null;
+	}
+
+	/**
+	 * This is called on a code path looped.
+	 * Then this raises a looped event.
+	 * @param {CodePathSegment} fromSegment A segment of prev.
+	 * @param {CodePathSegment} toSegment A segment of next.
+	 * @returns {void}
+	 */
+	onLooped(fromSegment, toSegment) {
+		if (fromSegment.reachable && toSegment.reachable) {
+			debug.dump(
+				`onCodePathSegmentLoop ${fromSegment.id} -> ${toSegment.id}`,
+			);
+			this.emit("onCodePathSegmentLoop", [
+				fromSegment,
+				toSegment,
+				this.currentNode,
+			]);
+		}
+	}
+}
+
+module.exports = CodePathAnalyzer;

slider/node_modules/eslint/lib/linter/code-path-analysis/code-path-segment.js

@@ -0,0 +1,262 @@
+/**
+ * @fileoverview The CodePathSegment class.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("./debug-helpers");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given segment is reachable.
+ * @param {CodePathSegment} segment A segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+	return segment.reachable;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A code path segment.
+ *
+ * Each segment is arranged in a series of linked lists (implemented by arrays)
+ * that keep track of the previous and next segments in a code path. In this way,
+ * you can navigate between all segments in any code path so long as you have a
+ * reference to any segment in that code path.
+ *
+ * When first created, the segment is in a detached state, meaning that it knows the
+ * segments that came before it but those segments don't know that this new segment
+ * follows it. Only when `CodePathSegment#markUsed()` is called on a segment does it
+ * officially become part of the code path by updating the previous segments to know
+ * that this new segment follows.
+ */
+class CodePathSegment {
+	/**
+	 * Creates a new instance.
+	 * @param {string} id An identifier.
+	 * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+	 *   This array includes unreachable segments.
+	 * @param {boolean} reachable A flag which shows this is reachable.
+	 */
+	constructor(id, allPrevSegments, reachable) {
+		/**
+		 * The identifier of this code path.
+		 * Rules use it to store additional information of each rule.
+		 * @type {string}
+		 */
+		this.id = id;
+
+		/**
+		 * An array of the next reachable segments.
+		 * @type {CodePathSegment[]}
+		 */
+		this.nextSegments = [];
+
+		/**
+		 * An array of the previous reachable segments.
+		 * @type {CodePathSegment[]}
+		 */
+		this.prevSegments = allPrevSegments.filter(isReachable);
+
+		/**
+		 * An array of all next segments including reachable and unreachable.
+		 * @type {CodePathSegment[]}
+		 */
+		this.allNextSegments = [];
+
+		/**
+		 * An array of all previous segments including reachable and unreachable.
+		 * @type {CodePathSegment[]}
+		 */
+		this.allPrevSegments = allPrevSegments;
+
+		/**
+		 * A flag which shows this is reachable.
+		 * @type {boolean}
+		 */
+		this.reachable = reachable;
+
+		// Internal data.
+		Object.defineProperty(this, "internal", {
+			value: {
+				// determines if the segment has been attached to the code path
+				used: false,
+
+				// array of previous segments coming from the end of a loop
+				loopedPrevSegments: [],
+			},
+		});
+
+		/* c8 ignore start */
+		if (debug.enabled) {
+			this.internal.nodes = [];
+		} /* c8 ignore stop */
+	}
+
+	/**
+	 * Checks a given previous segment is coming from the end of a loop.
+	 * @param {CodePathSegment} segment A previous segment to check.
+	 * @returns {boolean} `true` if the segment is coming from the end of a loop.
+	 */
+	isLoopedPrevSegment(segment) {
+		return this.internal.loopedPrevSegments.includes(segment);
+	}
+
+	/**
+	 * Creates the root segment.
+	 * @param {string} id An identifier.
+	 * @returns {CodePathSegment} The created segment.
+	 */
+	static newRoot(id) {
+		return new CodePathSegment(id, [], true);
+	}
+
+	/**
+	 * Creates a new segment and appends it after the given segments.
+	 * @param {string} id An identifier.
+	 * @param {CodePathSegment[]} allPrevSegments An array of the previous segments
+	 *      to append to.
+	 * @returns {CodePathSegment} The created segment.
+	 */
+	static newNext(id, allPrevSegments) {
+		return new CodePathSegment(
+			id,
+			CodePathSegment.flattenUnusedSegments(allPrevSegments),
+			allPrevSegments.some(isReachable),
+		);
+	}
+
+	/**
+	 * Creates an unreachable segment and appends it after the given segments.
+	 * @param {string} id An identifier.
+	 * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+	 * @returns {CodePathSegment} The created segment.
+	 */
+	static newUnreachable(id, allPrevSegments) {
+		const segment = new CodePathSegment(
+			id,
+			CodePathSegment.flattenUnusedSegments(allPrevSegments),
+			false,
+		);
+
+		/*
+		 * In `if (a) return a; foo();` case, the unreachable segment preceded by
+		 * the return statement is not used but must not be removed.
+		 */
+		CodePathSegment.markUsed(segment);
+
+		return segment;
+	}
+
+	/**
+	 * Creates a segment that follows given segments.
+	 * This factory method does not connect with `allPrevSegments`.
+	 * But this inherits `reachable` flag.
+	 * @param {string} id An identifier.
+	 * @param {CodePathSegment[]} allPrevSegments An array of the previous segments.
+	 * @returns {CodePathSegment} The created segment.
+	 */
+	static newDisconnected(id, allPrevSegments) {
+		return new CodePathSegment(id, [], allPrevSegments.some(isReachable));
+	}
+
+	/**
+	 * Marks a given segment as used.
+	 *
+	 * And this function registers the segment into the previous segments as a next.
+	 * @param {CodePathSegment} segment A segment to mark.
+	 * @returns {void}
+	 */
+	static markUsed(segment) {
+		if (segment.internal.used) {
+			return;
+		}
+		segment.internal.used = true;
+
+		let i;
+
+		if (segment.reachable) {
+			/*
+			 * If the segment is reachable, then it's officially part of the
+			 * code path. This loops through all previous segments to update
+			 * their list of next segments. Because the segment is reachable,
+			 * it's added to both `nextSegments` and `allNextSegments`.
+			 */
+			for (i = 0; i < segment.allPrevSegments.length; ++i) {
+				const prevSegment = segment.allPrevSegments[i];
+
+				prevSegment.allNextSegments.push(segment);
+				prevSegment.nextSegments.push(segment);
+			}
+		} else {
+			/*
+			 * If the segment is not reachable, then it's not officially part of the
+			 * code path. This loops through all previous segments to update
+			 * their list of next segments. Because the segment is not reachable,
+			 * it's added only to `allNextSegments`.
+			 */
+			for (i = 0; i < segment.allPrevSegments.length; ++i) {
+				segment.allPrevSegments[i].allNextSegments.push(segment);
+			}
+		}
+	}
+
+	/**
+	 * Marks a previous segment as looped.
+	 * @param {CodePathSegment} segment A segment.
+	 * @param {CodePathSegment} prevSegment A previous segment to mark.
+	 * @returns {void}
+	 */
+	static markPrevSegmentAsLooped(segment, prevSegment) {
+		segment.internal.loopedPrevSegments.push(prevSegment);
+	}
+
+	/**
+	 * Creates a new array based on an array of segments. If any segment in the
+	 * array is unused, then it is replaced by all of its previous segments.
+	 * All used segments are returned as-is without replacement.
+	 * @param {CodePathSegment[]} segments The array of segments to flatten.
+	 * @returns {CodePathSegment[]} The flattened array.
+	 */
+	static flattenUnusedSegments(segments) {
+		const done = new Set();
+
+		for (let i = 0; i < segments.length; ++i) {
+			const segment = segments[i];
+
+			// Ignores duplicated.
+			if (done.has(segment)) {
+				continue;
+			}
+
+			// Use previous segments if unused.
+			if (!segment.internal.used) {
+				for (let j = 0; j < segment.allPrevSegments.length; ++j) {
+					const prevSegment = segment.allPrevSegments[j];
+
+					if (!done.has(prevSegment)) {
+						done.add(prevSegment);
+					}
+				}
+			} else {
+				done.add(segment);
+			}
+		}
+
+		return [...done];
+	}
+}
+
+module.exports = CodePathSegment;

slider/node_modules/eslint/lib/linter/code-path-analysis/code-path.js

@@ -0,0 +1,332 @@
+/**
+ * @fileoverview A class of the code path.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const CodePathState = require("./code-path-state");
+const IdGenerator = require("./id-generator");
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A code path.
+ */
+class CodePath {
+	/**
+	 * Creates a new instance.
+	 * @param {Object} options Options for the function (see below).
+	 * @param {string} options.id An identifier.
+	 * @param {string} options.origin The type of code path origin.
+	 * @param {CodePath|null} options.upper The code path of the upper function scope.
+	 * @param {Function} options.onLooped A callback function to notify looping.
+	 */
+	constructor({ id, origin, upper, onLooped }) {
+		/**
+		 * The identifier of this code path.
+		 * Rules use it to store additional information of each rule.
+		 * @type {string}
+		 */
+		this.id = id;
+
+		/**
+		 * The reason that this code path was started. May be "program",
+		 * "function", "class-field-initializer", or "class-static-block".
+		 * @type {string}
+		 */
+		this.origin = origin;
+
+		/**
+		 * The code path of the upper function scope.
+		 * @type {CodePath|null}
+		 */
+		this.upper = upper;
+
+		/**
+		 * The code paths of nested function scopes.
+		 * @type {CodePath[]}
+		 */
+		this.childCodePaths = [];
+
+		// Initializes internal state.
+		Object.defineProperty(this, "internal", {
+			value: new CodePathState(new IdGenerator(`${id}_`), onLooped),
+		});
+
+		// Adds this into `childCodePaths` of `upper`.
+		if (upper) {
+			upper.childCodePaths.push(this);
+		}
+	}
+
+	/**
+	 * Gets the state of a given code path.
+	 * @param {CodePath} codePath A code path to get.
+	 * @returns {CodePathState} The state of the code path.
+	 */
+	static getState(codePath) {
+		return codePath.internal;
+	}
+
+	/**
+	 * The initial code path segment. This is the segment that is at the head
+	 * of the code path.
+	 * This is a passthrough to the underlying `CodePathState`.
+	 * @type {CodePathSegment}
+	 */
+	get initialSegment() {
+		return this.internal.initialSegment;
+	}
+
+	/**
+	 * Final code path segments. These are the terminal (tail) segments in the
+	 * code path, which is the combination of `returnedSegments` and `thrownSegments`.
+	 * All segments in this array are reachable.
+	 * This is a passthrough to the underlying `CodePathState`.
+	 * @type {CodePathSegment[]}
+	 */
+	get finalSegments() {
+		return this.internal.finalSegments;
+	}
+
+	/**
+	 * Final code path segments that represent normal completion of the code path.
+	 * For functions, this means both explicit `return` statements and implicit returns,
+	 * such as the last reachable segment in a function that does not have an
+	 * explicit `return` as this implicitly returns `undefined`. For scripts,
+	 * modules, class field initializers, and class static blocks, this means
+	 * all lines of code have been executed.
+	 * These segments are also present in `finalSegments`.
+	 * This is a passthrough to the underlying `CodePathState`.
+	 * @type {CodePathSegment[]}
+	 */
+	get returnedSegments() {
+		return this.internal.returnedForkContext;
+	}
+
+	/**
+	 * Final code path segments that represent `throw` statements.
+	 * This is a passthrough to the underlying `CodePathState`.
+	 * These segments are also present in `finalSegments`.
+	 * @type {CodePathSegment[]}
+	 */
+	get thrownSegments() {
+		return this.internal.thrownForkContext;
+	}
+
+	/**
+	 * Traverses all segments in this code path.
+	 *
+	 *     codePath.traverseSegments((segment, controller) => {
+	 *         // do something.
+	 *     });
+	 *
+	 * This method enumerates segments in order from the head.
+	 *
+	 * The `controller` argument has two methods:
+	 *
+	 * - `skip()` - skips the following segments in this branch
+	 * - `break()` - skips all following segments in the traversal
+	 *
+	 * A note on the parameters: the `options` argument is optional. This means
+	 * the first argument might be an options object or the callback function.
+	 * @param {Object} [optionsOrCallback] Optional first and last segments to traverse.
+	 * @param {CodePathSegment} [optionsOrCallback.first] The first segment to traverse.
+	 * @param {CodePathSegment} [optionsOrCallback.last] The last segment to traverse.
+	 * @param {Function} callback A callback function.
+	 * @returns {void}
+	 */
+	traverseSegments(optionsOrCallback, callback) {
+		// normalize the arguments into a callback and options
+		let resolvedOptions;
+		let resolvedCallback;
+
+		if (typeof optionsOrCallback === "function") {
+			resolvedCallback = optionsOrCallback;
+			resolvedOptions = {};
+		} else {
+			resolvedOptions = optionsOrCallback || {};
+			resolvedCallback = callback;
+		}
+
+		// determine where to start traversing from based on the options
+		const startSegment =
+			resolvedOptions.first || this.internal.initialSegment;
+		const lastSegment = resolvedOptions.last;
+
+		// set up initial location information
+		let record;
+		let index;
+		let end;
+		let segment = null;
+
+		// segments that have already been visited during traversal
+		const visited = new Set();
+
+		// tracks the traversal steps
+		const stack = [[startSegment, 0]];
+
+		// segments that have been skipped during traversal
+		const skipped = new Set();
+
+		// indicates if we exited early from the traversal
+		let broken = false;
+
+		/**
+		 * Maintains traversal state.
+		 */
+		const controller = {
+			/**
+			 * Skip the following segments in this branch.
+			 * @returns {void}
+			 */
+			skip() {
+				skipped.add(segment);
+			},
+
+			/**
+			 * Stop traversal completely - do not traverse to any
+			 * other segments.
+			 * @returns {void}
+			 */
+			break() {
+				broken = true;
+			},
+		};
+
+		/**
+		 * Checks if a given previous segment has been visited.
+		 * @param {CodePathSegment} prevSegment A previous segment to check.
+		 * @returns {boolean} `true` if the segment has been visited.
+		 */
+		function isVisited(prevSegment) {
+			return (
+				visited.has(prevSegment) ||
+				segment.isLoopedPrevSegment(prevSegment)
+			);
+		}
+
+		/**
+		 * Checks if a given previous segment has been skipped.
+		 * @param {CodePathSegment} prevSegment A previous segment to check.
+		 * @returns {boolean} `true` if the segment has been skipped.
+		 */
+		function isSkipped(prevSegment) {
+			return (
+				skipped.has(prevSegment) ||
+				segment.isLoopedPrevSegment(prevSegment)
+			);
+		}
+
+		// the traversal
+		while (stack.length > 0) {
+			/*
+			 * This isn't a pure stack. We use the top record all the time
+			 * but don't always pop it off. The record is popped only if
+			 * one of the following is true:
+			 *
+			 * 1) We have already visited the segment.
+			 * 2) We have not visited *all* of the previous segments.
+			 * 3) We have traversed past the available next segments.
+			 *
+			 * Otherwise, we just read the value and sometimes modify the
+			 * record as we traverse.
+			 */
+			record = stack.at(-1);
+			segment = record[0];
+			index = record[1];
+
+			if (index === 0) {
+				// Skip if this segment has been visited already.
+				if (visited.has(segment)) {
+					stack.pop();
+					continue;
+				}
+
+				// Skip if all previous segments have not been visited.
+				if (
+					segment !== startSegment &&
+					segment.prevSegments.length > 0 &&
+					!segment.prevSegments.every(isVisited)
+				) {
+					stack.pop();
+					continue;
+				}
+
+				visited.add(segment);
+
+				// Skips the segment if all previous segments have been skipped.
+				const shouldSkip =
+					skipped.size > 0 &&
+					segment.prevSegments.length > 0 &&
+					segment.prevSegments.every(isSkipped);
+
+				/*
+				 * If the most recent segment hasn't been skipped, then we call
+				 * the callback, passing in the segment and the controller.
+				 */
+				if (!shouldSkip) {
+					resolvedCallback.call(this, segment, controller);
+
+					// exit if we're at the last segment
+					if (segment === lastSegment) {
+						controller.skip();
+					}
+
+					/*
+					 * If the previous statement was executed, or if the callback
+					 * called a method on the controller, we might need to exit the
+					 * loop, so check for that and break accordingly.
+					 */
+					if (broken) {
+						break;
+					}
+				} else {
+					// If the most recent segment has been skipped, then mark it as skipped.
+					skipped.add(segment);
+				}
+			}
+
+			// Update the stack.
+			end = segment.nextSegments.length - 1;
+			if (index < end) {
+				/*
+				 * If we haven't yet visited all of the next segments, update
+				 * the current top record on the stack to the next index to visit
+				 * and then push a record for the current segment on top.
+				 *
+				 * Setting the current top record's index lets us know how many
+				 * times we've been here and ensures that the segment won't be
+				 * reprocessed (because we only process segments with an index
+				 * of 0).
+				 */
+				record[1] += 1;
+				stack.push([segment.nextSegments[index], 0]);
+			} else if (index === end) {
+				/*
+				 * If we are at the last next segment, then reset the top record
+				 * in the stack to next segment and set its index to 0 so it will
+				 * be processed next.
+				 */
+				record[0] = segment.nextSegments[index];
+				record[1] = 0;
+			} else {
+				/*
+				 * If index > end, that means we have no more segments that need
+				 * processing. So, we pop that record off of the stack in order to
+				 * continue traversing at the next level up.
+				 */
+				stack.pop();
+			}
+		}
+	}
+}
+
+module.exports = CodePath;

slider/node_modules/eslint/lib/linter/code-path-analysis/debug-helpers.js

@@ -0,0 +1,223 @@
+/**
+ * @fileoverview Helpers to debug for code path analysis.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("debug")("eslint:code-path");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Gets id of a given segment.
+ * @param {CodePathSegment} segment A segment to get.
+ * @returns {string} Id of the segment.
+ */
+/* c8 ignore next */
+// eslint-disable-next-line jsdoc/require-jsdoc -- Ignoring
+function getId(segment) {
+	return segment.id + (segment.reachable ? "" : "!");
+}
+
+/**
+ * Get string for the given node and operation.
+ * @param {ASTNode} node The node to convert.
+ * @param {"enter" | "exit" | undefined} label The operation label.
+ * @returns {string} The string representation.
+ */
+function nodeToString(node, label) {
+	const suffix = label ? `:${label}` : "";
+
+	switch (node.type) {
+		case "Identifier":
+			return `${node.type}${suffix} (${node.name})`;
+		case "Literal":
+			return `${node.type}${suffix} (${node.value})`;
+		default:
+			return `${node.type}${suffix}`;
+	}
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+module.exports = {
+	/**
+	 * A flag that debug dumping is enabled or not.
+	 * @type {boolean}
+	 */
+	enabled: debug.enabled,
+
+	/**
+	 * Dumps given objects.
+	 * @param {...any} args objects to dump.
+	 * @returns {void}
+	 */
+	dump: debug,
+
+	/**
+	 * Dumps the current analyzing state.
+	 * @param {ASTNode} node A node to dump.
+	 * @param {CodePathState} state A state to dump.
+	 * @param {boolean} leaving A flag whether or not it's leaving
+	 * @returns {void}
+	 */
+	dumpState: !debug.enabled
+		? debug
+		: /* c8 ignore next */ function (node, state, leaving) {
+				for (let i = 0; i < state.currentSegments.length; ++i) {
+					const segInternal = state.currentSegments[i].internal;
+
+					if (leaving) {
+						const last = segInternal.nodes.length - 1;
+
+						if (
+							last >= 0 &&
+							segInternal.nodes[last] ===
+								nodeToString(node, "enter")
+						) {
+							segInternal.nodes[last] = nodeToString(
+								node,
+								void 0,
+							);
+						} else {
+							segInternal.nodes.push(nodeToString(node, "exit"));
+						}
+					} else {
+						segInternal.nodes.push(nodeToString(node, "enter"));
+					}
+				}
+
+				debug(
+					[
+						`${state.currentSegments.map(getId).join(",")})`,
+						`${node.type}${leaving ? ":exit" : ""}`,
+					].join(" "),
+				);
+			},
+
+	/**
+	 * Dumps a DOT code of a given code path.
+	 * The DOT code can be visualized with Graphvis.
+	 * @param {CodePath} codePath A code path to dump.
+	 * @returns {void}
+	 * @see http://www.graphviz.org
+	 * @see http://www.webgraphviz.com
+	 */
+	dumpDot: !debug.enabled
+		? debug
+		: /* c8 ignore next */ function (codePath) {
+				let text =
+					"\n" +
+					"digraph {\n" +
+					'node[shape=box,style="rounded,filled",fillcolor=white];\n' +
+					'initial[label="",shape=circle,style=filled,fillcolor=black,width=0.25,height=0.25];\n';
+
+				if (codePath.returnedSegments.length > 0) {
+					text +=
+						'final[label="",shape=doublecircle,style=filled,fillcolor=black,width=0.25,height=0.25];\n';
+				}
+				if (codePath.thrownSegments.length > 0) {
+					text +=
+						'thrown[label="✘",shape=circle,width=0.3,height=0.3,fixedsize=true];\n';
+				}
+
+				const traceMap = Object.create(null);
+				const arrows = this.makeDotArrows(codePath, traceMap);
+
+				// eslint-disable-next-line guard-for-in -- Want ability to traverse prototype
+				for (const id in traceMap) {
+					const segment = traceMap[id];
+
+					text += `${id}[`;
+
+					if (segment.reachable) {
+						text += 'label="';
+					} else {
+						text +=
+							'style="rounded,dashed,filled",fillcolor="#FF9800",label="<<unreachable>>\\n';
+					}
+
+					if (segment.internal.nodes.length > 0) {
+						text += segment.internal.nodes.join("\\n");
+					} else {
+						text += "????";
+					}
+
+					text += '"];\n';
+				}
+
+				text += `${arrows}\n`;
+				text += "}";
+				debug("DOT", text);
+			},
+
+	/**
+	 * Makes a DOT code of a given code path.
+	 * The DOT code can be visualized with Graphvis.
+	 * @param {CodePath} codePath A code path to make DOT.
+	 * @param {Object} traceMap Optional. A map to check whether or not segments had been done.
+	 * @returns {string} A DOT code of the code path.
+	 */
+	makeDotArrows(codePath, traceMap) {
+		const stack = [[codePath.initialSegment, 0]];
+		const done = traceMap || Object.create(null);
+		let lastId = codePath.initialSegment.id;
+		let text = `initial->${codePath.initialSegment.id}`;
+
+		while (stack.length > 0) {
+			const item = stack.pop();
+			const segment = item[0];
+			const index = item[1];
+
+			if (done[segment.id] && index === 0) {
+				continue;
+			}
+			done[segment.id] = segment;
+
+			const nextSegment = segment.allNextSegments[index];
+
+			if (!nextSegment) {
+				continue;
+			}
+
+			if (lastId === segment.id) {
+				text += `->${nextSegment.id}`;
+			} else {
+				text += `;\n${segment.id}->${nextSegment.id}`;
+			}
+			lastId = nextSegment.id;
+
+			stack.unshift([segment, 1 + index]);
+			stack.push([nextSegment, 0]);
+		}
+
+		codePath.returnedSegments.forEach(finalSegment => {
+			if (lastId === finalSegment.id) {
+				text += "->final";
+			} else {
+				text += `;\n${finalSegment.id}->final`;
+			}
+			lastId = null;
+		});
+
+		codePath.thrownSegments.forEach(finalSegment => {
+			if (lastId === finalSegment.id) {
+				text += "->thrown";
+			} else {
+				text += `;\n${finalSegment.id}->thrown`;
+			}
+			lastId = null;
+		});
+
+		return `${text};`;
+	},
+};

slider/node_modules/eslint/lib/linter/code-path-analysis/fork-context.js

@@ -0,0 +1,374 @@
+/**
+ * @fileoverview A class to operate forking.
+ *
+ * This is state of forking.
+ * This has a fork list and manages it.
+ *
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("../../shared/assert"),
+	CodePathSegment = require("./code-path-segment");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines whether or not a given segment is reachable.
+ * @param {CodePathSegment} segment The segment to check.
+ * @returns {boolean} `true` if the segment is reachable.
+ */
+function isReachable(segment) {
+	return segment.reachable;
+}
+
+/**
+ * Creates a new segment for each fork in the given context and appends it
+ * to the end of the specified range of segments. Ultimately, this ends up calling
+ * `new CodePathSegment()` for each of the forks using the `create` argument
+ * as a wrapper around special behavior.
+ *
+ * The `startIndex` and `endIndex` arguments specify a range of segments in
+ * `context` that should become `allPrevSegments` for the newly created
+ * `CodePathSegment` objects.
+ *
+ * When `context.segmentsList` is `[[a, b], [c, d], [e, f]]`, `begin` is `0`, and
+ * `end` is `-1`, this creates two new segments, `[g, h]`. This `g` is appended to
+ * the end of the path from `a`, `c`, and `e`. This `h` is appended to the end of
+ * `b`, `d`, and `f`.
+ * @param {ForkContext} context An instance from which the previous segments
+ *      will be obtained.
+ * @param {number} startIndex The index of the first segment in the context
+ *      that should be specified as previous segments for the newly created segments.
+ * @param {number} endIndex The index of the last segment in the context
+ *      that should be specified as previous segments for the newly created segments.
+ * @param {Function} create A function that creates new `CodePathSegment`
+ *      instances in a particular way. See the `CodePathSegment.new*` methods.
+ * @returns {Array<CodePathSegment>} An array of the newly-created segments.
+ */
+function createSegments(context, startIndex, endIndex, create) {
+	/** @type {Array<Array<CodePathSegment>>} */
+	const list = context.segmentsList;
+
+	/*
+	 * Both `startIndex` and `endIndex` work the same way: if the number is zero
+	 * or more, then the number is used as-is. If the number is negative,
+	 * then that number is added to the length of the segments list to
+	 * determine the index to use. That means -1 for either argument
+	 * is the last element, -2 is the second to last, and so on.
+	 *
+	 * So if `startIndex` is 0, `endIndex` is -1, and `list.length` is 3, the
+	 * effective `startIndex` is 0 and the effective `endIndex` is 2, so this function
+	 * will include items at indices 0, 1, and 2.
+	 *
+	 * Therefore, if `startIndex` is -1 and `endIndex` is -1, that means we'll only
+	 * be using the last segment in `list`.
+	 */
+	const normalizedBegin =
+		startIndex >= 0 ? startIndex : list.length + startIndex;
+	const normalizedEnd = endIndex >= 0 ? endIndex : list.length + endIndex;
+
+	/** @type {Array<CodePathSegment>} */
+	const segments = [];
+
+	for (let i = 0; i < context.count; ++i) {
+		// this is passed into `new CodePathSegment` to add to code path.
+		const allPrevSegments = [];
+
+		for (let j = normalizedBegin; j <= normalizedEnd; ++j) {
+			allPrevSegments.push(list[j][i]);
+		}
+
+		// note: `create` is just a wrapper that augments `new CodePathSegment`.
+		segments.push(create(context.idGenerator.next(), allPrevSegments));
+	}
+
+	return segments;
+}
+
+/**
+ * Inside of a `finally` block we end up with two parallel paths. If the code path
+ * exits by a control statement (such as `break` or `continue`) from the `finally`
+ * block, then we need to merge the remaining parallel paths back into one.
+ * @param {ForkContext} context The fork context to work on.
+ * @param {Array<CodePathSegment>} segments Segments to merge.
+ * @returns {Array<CodePathSegment>} The merged segments.
+ */
+function mergeExtraSegments(context, segments) {
+	let currentSegments = segments;
+
+	/*
+	 * We need to ensure that the array returned from this function contains no more
+	 * than the number of segments that the context allows. `context.count` indicates
+	 * how many items should be in the returned array to ensure that the new segment
+	 * entries will line up with the already existing segment entries.
+	 */
+	while (currentSegments.length > context.count) {
+		const merged = [];
+
+		/*
+		 * Because `context.count` is a factor of 2 inside of a `finally` block,
+		 * we can divide the segment count by 2 to merge the paths together.
+		 * This loops through each segment in the list and creates a new `CodePathSegment`
+		 * that has the segment and the segment two slots away as previous segments.
+		 *
+		 * If `currentSegments` is [a,b,c,d], this will create new segments e and f, such
+		 * that:
+		 *
+		 * When `i` is 0:
+		 * a->e
+		 * c->e
+		 *
+		 * When `i` is 1:
+		 * b->f
+		 * d->f
+		 */
+		for (
+			let i = 0, length = Math.floor(currentSegments.length / 2);
+			i < length;
+			++i
+		) {
+			merged.push(
+				CodePathSegment.newNext(context.idGenerator.next(), [
+					currentSegments[i],
+					currentSegments[i + length],
+				]),
+			);
+		}
+
+		/*
+		 * Go through the loop condition one more time to see if we have the
+		 * number of segments for the context. If not, we'll keep merging paths
+		 * of the merged segments until we get there.
+		 */
+		currentSegments = merged;
+	}
+
+	return currentSegments;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Manages the forking of code paths.
+ */
+class ForkContext {
+	/**
+	 * Creates a new instance.
+	 * @param {IdGenerator} idGenerator An identifier generator for segments.
+	 * @param {ForkContext|null} upper The preceding fork context.
+	 * @param {number} count The number of parallel segments in each element
+	 *      of `segmentsList`.
+	 */
+	constructor(idGenerator, upper, count) {
+		/**
+		 * The ID generator that will generate segment IDs for any new
+		 * segments that are created.
+		 * @type {IdGenerator}
+		 */
+		this.idGenerator = idGenerator;
+
+		/**
+		 * The preceding fork context.
+		 * @type {ForkContext|null}
+		 */
+		this.upper = upper;
+
+		/**
+		 * The number of elements in each element of `segmentsList`. In most
+		 * cases, this is 1 but can be 2 when there is a `finally` present,
+		 * which forks the code path outside of normal flow. In the case of nested
+		 * `finally` blocks, this can be a multiple of 2.
+		 * @type {number}
+		 */
+		this.count = count;
+
+		/**
+		 * The segments within this context. Each element in this array has
+		 * `count` elements that represent one step in each fork. For example,
+		 * when `segmentsList` is `[[a, b], [c, d], [e, f]]`, there is one path
+		 * a->c->e and one path b->d->f, and `count` is 2 because each element
+		 * is an array with two elements.
+		 * @type {Array<Array<CodePathSegment>>}
+		 */
+		this.segmentsList = [];
+	}
+
+	/**
+	 * The segments that begin this fork context.
+	 * @type {Array<CodePathSegment>}
+	 */
+	get head() {
+		const list = this.segmentsList;
+
+		return list.length === 0 ? [] : list.at(-1);
+	}
+
+	/**
+	 * Indicates if the context contains no segments.
+	 * @type {boolean}
+	 */
+	get empty() {
+		return this.segmentsList.length === 0;
+	}
+
+	/**
+	 * Indicates if there are any segments that are reachable.
+	 * @type {boolean}
+	 */
+	get reachable() {
+		const segments = this.head;
+
+		return segments.length > 0 && segments.some(isReachable);
+	}
+
+	/**
+	 * Creates new segments in this context and appends them to the end of the
+	 * already existing `CodePathSegment`s specified by `startIndex` and
+	 * `endIndex`.
+	 * @param {number} startIndex The index of the first segment in the context
+	 *      that should be specified as previous segments for the newly created segments.
+	 * @param {number} endIndex The index of the last segment in the context
+	 *      that should be specified as previous segments for the newly created segments.
+	 * @returns {Array<CodePathSegment>} An array of the newly created segments.
+	 */
+	makeNext(startIndex, endIndex) {
+		return createSegments(
+			this,
+			startIndex,
+			endIndex,
+			CodePathSegment.newNext,
+		);
+	}
+
+	/**
+	 * Creates new unreachable segments in this context and appends them to the end of the
+	 * already existing `CodePathSegment`s specified by `startIndex` and
+	 * `endIndex`.
+	 * @param {number} startIndex The index of the first segment in the context
+	 *      that should be specified as previous segments for the newly created segments.
+	 * @param {number} endIndex The index of the last segment in the context
+	 *      that should be specified as previous segments for the newly created segments.
+	 * @returns {Array<CodePathSegment>} An array of the newly created segments.
+	 */
+	makeUnreachable(startIndex, endIndex) {
+		return createSegments(
+			this,
+			startIndex,
+			endIndex,
+			CodePathSegment.newUnreachable,
+		);
+	}
+
+	/**
+	 * Creates new segments in this context and does not append them to the end
+	 *  of the already existing `CodePathSegment`s specified by `startIndex` and
+	 * `endIndex`. The `startIndex` and `endIndex` are only used to determine if
+	 * the new segments should be reachable. If any of the segments in this range
+	 * are reachable then the new segments are also reachable; otherwise, the new
+	 * segments are unreachable.
+	 * @param {number} startIndex The index of the first segment in the context
+	 *      that should be considered for reachability.
+	 * @param {number} endIndex The index of the last segment in the context
+	 *      that should be considered for reachability.
+	 * @returns {Array<CodePathSegment>} An array of the newly created segments.
+	 */
+	makeDisconnected(startIndex, endIndex) {
+		return createSegments(
+			this,
+			startIndex,
+			endIndex,
+			CodePathSegment.newDisconnected,
+		);
+	}
+
+	/**
+	 * Adds segments to the head of this context.
+	 * @param {Array<CodePathSegment>} segments The segments to add.
+	 * @returns {void}
+	 */
+	add(segments) {
+		assert(
+			segments.length >= this.count,
+			`${segments.length} >= ${this.count}`,
+		);
+		this.segmentsList.push(mergeExtraSegments(this, segments));
+	}
+
+	/**
+	 * Replaces the head segments with the given segments.
+	 * The current head segments are removed.
+	 * @param {Array<CodePathSegment>} replacementHeadSegments The new head segments.
+	 * @returns {void}
+	 */
+	replaceHead(replacementHeadSegments) {
+		assert(
+			replacementHeadSegments.length >= this.count,
+			`${replacementHeadSegments.length} >= ${this.count}`,
+		);
+		this.segmentsList.splice(
+			-1,
+			1,
+			mergeExtraSegments(this, replacementHeadSegments),
+		);
+	}
+
+	/**
+	 * Adds all segments of a given fork context into this context.
+	 * @param {ForkContext} otherForkContext The fork context to add from.
+	 * @returns {void}
+	 */
+	addAll(otherForkContext) {
+		assert(otherForkContext.count === this.count);
+		this.segmentsList.push(...otherForkContext.segmentsList);
+	}
+
+	/**
+	 * Clears all segments in this context.
+	 * @returns {void}
+	 */
+	clear() {
+		this.segmentsList = [];
+	}
+
+	/**
+	 * Creates a new root context, meaning that there are no parent
+	 * fork contexts.
+	 * @param {IdGenerator} idGenerator An identifier generator for segments.
+	 * @returns {ForkContext} New fork context.
+	 */
+	static newRoot(idGenerator) {
+		const context = new ForkContext(idGenerator, null, 1);
+
+		context.add([CodePathSegment.newRoot(idGenerator.next())]);
+
+		return context;
+	}
+
+	/**
+	 * Creates an empty fork context preceded by a given context.
+	 * @param {ForkContext} parentContext The parent fork context.
+	 * @param {boolean} shouldForkLeavingPath Indicates that we are inside of
+	 *      a `finally` block and should therefore fork the path that leaves
+	 *      `finally`.
+	 * @returns {ForkContext} New fork context.
+	 */
+	static newEmpty(parentContext, shouldForkLeavingPath) {
+		return new ForkContext(
+			parentContext.idGenerator,
+			parentContext,
+			(shouldForkLeavingPath ? 2 : 1) * parentContext.count,
+		);
+	}
+}
+
+module.exports = ForkContext;

slider/node_modules/eslint/lib/linter/code-path-analysis/id-generator.js

@@ -0,0 +1,44 @@
+/**
+ * @fileoverview A class of identifiers generator for code path segments.
+ *
+ * Each rule uses the identifier of code path segments to store additional
+ * information of the code path.
+ *
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A generator for unique ids.
+ */
+class IdGenerator {
+	/**
+	 * @param {string} prefix Optional. A prefix of generated ids.
+	 */
+	constructor(prefix) {
+		this.prefix = String(prefix);
+		this.n = 0;
+	}
+
+	/**
+	 * Generates id.
+	 * @returns {string} A generated id.
+	 */
+	next() {
+		this.n = (1 + this.n) | 0;
+
+		/* c8 ignore start */
+		if (this.n < 0) {
+			this.n = 1;
+		} /* c8 ignore stop */
+
+		return this.prefix + this.n;
+	}
+}
+
+module.exports = IdGenerator;

slider/node_modules/eslint/lib/linter/esquery.js

@@ -0,0 +1,332 @@
+/**
+ * @fileoverview ESQuery wrapper for ESLint.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const esquery = require("esquery");
+
+//-----------------------------------------------------------------------------
+// Typedefs
+//-----------------------------------------------------------------------------
+
+/**
+ * @typedef {import("esquery").Selector} ESQuerySelector
+ * @typedef {import("esquery").ESQueryOptions} ESQueryOptions
+ */
+
+//------------------------------------------------------------------------------
+// Classes
+//------------------------------------------------------------------------------
+
+/**
+ * The result of parsing and analyzing an ESQuery selector.
+ */
+class ESQueryParsedSelector {
+	/**
+	 * The raw selector string that was parsed
+	 * @type {string}
+	 */
+	source;
+
+	/**
+	 * Whether this selector is an exit selector
+	 * @type {boolean}
+	 */
+	isExit;
+
+	/**
+	 * An object (from esquery) describing the matching behavior of the selector
+	 * @type {ESQuerySelector}
+	 */
+	root;
+
+	/**
+	 * The node types that could possibly trigger this selector, or `null` if all node types could trigger it
+	 * @type {string[]|null}
+	 */
+	nodeTypes;
+
+	/**
+	 * The number of class, pseudo-class, and attribute queries in this selector
+	 * @type {number}
+	 */
+	attributeCount;
+
+	/**
+	 * The number of identifier queries in this selector
+	 * @type {number}
+	 */
+	identifierCount;
+
+	/**
+	 * Creates a new parsed selector.
+	 * @param {string} source The raw selector string that was parsed
+	 * @param {boolean} isExit Whether this selector is an exit selector
+	 * @param {ESQuerySelector} root An object (from esquery) describing the matching behavior of the selector
+	 * @param {string[]|null} nodeTypes The node types that could possibly trigger this selector, or `null` if all node types could trigger it
+	 * @param {number} attributeCount The number of class, pseudo-class, and attribute queries in this selector
+	 * @param {number} identifierCount The number of identifier queries in this selector
+	 */
+	constructor(
+		source,
+		isExit,
+		root,
+		nodeTypes,
+		attributeCount,
+		identifierCount,
+	) {
+		this.source = source;
+		this.isExit = isExit;
+		this.root = root;
+		this.nodeTypes = nodeTypes;
+		this.attributeCount = attributeCount;
+		this.identifierCount = identifierCount;
+	}
+
+	/**
+	 * Compares this selector's specifity to another selector for sorting purposes.
+	 * @param {ESQueryParsedSelector} otherSelector The selector to compare against
+	 * @returns {number}
+	 * a value less than 0 if this selector is less specific than otherSelector
+	 * a value greater than 0 if this selector is more specific than otherSelector
+	 * a value less than 0 if this selector and otherSelector have the same specificity, and this selector <= otherSelector alphabetically
+	 * a value greater than 0 if this selector and otherSelector have the same specificity, and this selector > otherSelector alphabetically
+	 */
+	compare(otherSelector) {
+		return (
+			this.attributeCount - otherSelector.attributeCount ||
+			this.identifierCount - otherSelector.identifierCount ||
+			(this.source <= otherSelector.source ? -1 : 1)
+		);
+	}
+}
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const selectorCache = new Map();
+
+/**
+ * Computes the union of one or more arrays
+ * @param {...any[]} arrays One or more arrays to union
+ * @returns {any[]} The union of the input arrays
+ */
+function union(...arrays) {
+	return [...new Set(arrays.flat())];
+}
+
+/**
+ * Computes the intersection of one or more arrays
+ * @param {...any[]} arrays One or more arrays to intersect
+ * @returns {any[]} The intersection of the input arrays
+ */
+function intersection(...arrays) {
+	if (arrays.length === 0) {
+		return [];
+	}
+
+	let result = [...new Set(arrays[0])];
+
+	for (const array of arrays.slice(1)) {
+		result = result.filter(x => array.includes(x));
+	}
+	return result;
+}
+
+/**
+ * Analyzes a parsed selector and returns combined data about it
+ * @param {ESQuerySelector} parsedSelector An object (from esquery) describing the matching behavior of the selector
+ * @returns {{nodeTypes:string[]|null, attributeCount:number, identifierCount:number}} Object containing selector data.
+ */
+function analyzeParsedSelector(parsedSelector) {
+	let attributeCount = 0;
+	let identifierCount = 0;
+
+	/**
+	 * Analyzes a selector and returns the node types that could possibly trigger it.
+	 * @param {ESQuerySelector} selector The selector to analyze.
+	 * @returns {string[]|null} The node types that could possibly trigger this selector, or `null` if all node types could trigger it
+	 */
+	function analyzeSelector(selector) {
+		switch (selector.type) {
+			case "identifier":
+				identifierCount++;
+				return [selector.value];
+
+			case "not":
+				selector.selectors.map(analyzeSelector);
+				return null;
+
+			case "matches": {
+				const typesForComponents =
+					selector.selectors.map(analyzeSelector);
+
+				if (typesForComponents.every(Boolean)) {
+					return union(...typesForComponents);
+				}
+				return null;
+			}
+
+			case "compound": {
+				const typesForComponents = selector.selectors
+					.map(analyzeSelector)
+					.filter(typesForComponent => typesForComponent);
+
+				// If all of the components could match any type, then the compound could also match any type.
+				if (!typesForComponents.length) {
+					return null;
+				}
+
+				/*
+				 * If at least one of the components could only match a particular type, the compound could only match
+				 * the intersection of those types.
+				 */
+				return intersection(...typesForComponents);
+			}
+
+			case "attribute":
+			case "field":
+			case "nth-child":
+			case "nth-last-child":
+				attributeCount++;
+				return null;
+
+			case "child":
+			case "descendant":
+			case "sibling":
+			case "adjacent":
+				analyzeSelector(selector.left);
+				return analyzeSelector(selector.right);
+
+			case "class":
+				// TODO: abstract into JSLanguage somehow
+				if (selector.name === "function") {
+					return [
+						"FunctionDeclaration",
+						"FunctionExpression",
+						"ArrowFunctionExpression",
+					];
+				}
+				return null;
+
+			default:
+				return null;
+		}
+	}
+
+	const nodeTypes = analyzeSelector(parsedSelector);
+
+	return {
+		nodeTypes,
+		attributeCount,
+		identifierCount,
+	};
+}
+
+/**
+ * Tries to parse a simple selector string, such as a single identifier or wildcard.
+ * This saves time by avoiding the overhead of esquery parsing for simple cases.
+ * @param {string} selector The selector string to parse.
+ * @returns {Object|null} An object describing the selector if it is simple, or `null` if it is not.
+ */
+function trySimpleParseSelector(selector) {
+	if (selector === "*") {
+		return {
+			type: "wildcard",
+			value: "*",
+		};
+	}
+
+	if (/^[a-z]+$/iu.test(selector)) {
+		return {
+			type: "identifier",
+			value: selector,
+		};
+	}
+
+	return null;
+}
+
+/**
+ * Parses a raw selector string, and throws a useful error if parsing fails.
+ * @param {string} selector The selector string to parse.
+ * @returns {Object} An object (from esquery) describing the matching behavior of this selector
+ * @throws {Error} An error if the selector is invalid
+ */
+function tryParseSelector(selector) {
+	try {
+		return esquery.parse(selector);
+	} catch (err) {
+		if (
+			err.location &&
+			err.location.start &&
+			typeof err.location.start.offset === "number"
+		) {
+			throw new SyntaxError(
+				`Syntax error in selector "${selector}" at position ${err.location.start.offset}: ${err.message}`,
+				{
+					cause: err,
+				},
+			);
+		}
+		throw err;
+	}
+}
+
+/**
+ * Parses a raw selector string, and returns the parsed selector along with specificity and type information.
+ * @param {string} source A raw AST selector
+ * @returns {ESQueryParsedSelector} A selector descriptor
+ */
+function parse(source) {
+	if (selectorCache.has(source)) {
+		return selectorCache.get(source);
+	}
+
+	const cleanSource = source.replace(/:exit$/u, "");
+	const parsedSelector =
+		trySimpleParseSelector(cleanSource) ?? tryParseSelector(cleanSource);
+	const { nodeTypes, attributeCount, identifierCount } =
+		analyzeParsedSelector(parsedSelector);
+
+	const result = new ESQueryParsedSelector(
+		source,
+		source.endsWith(":exit"),
+		parsedSelector,
+		nodeTypes,
+		attributeCount,
+		identifierCount,
+	);
+
+	selectorCache.set(source, result);
+	return result;
+}
+
+/**
+ * Checks if a node matches a given selector.
+ * @param {Object} node The node to check against the selector.
+ * @param {ESQuerySelector} root The root of the selector to match against.
+ * @param {Object[]} ancestry The ancestry of the node being checked, which is an array of nodes from the current node to the root.
+ * @param {ESQueryOptions} options The options to use for matching.
+ * @returns {boolean} `true` if the node matches the selector, `false` otherwise.
+ */
+function matches(node, root, ancestry, options) {
+	return esquery.matches(node, root, ancestry, options);
+}
+
+//-----------------------------------------------------------------------------
+// Exports
+//-----------------------------------------------------------------------------
+
+module.exports = {
+	parse,
+	matches,
+	ESQueryParsedSelector,
+};

slider/node_modules/eslint/lib/linter/file-context.js

@@ -0,0 +1,144 @@
+/**
+ * @fileoverview The FileContext class.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+/**
+ * Represents a file context that the linter can use to lint a file.
+ */
+class FileContext {
+	/**
+	 * The current working directory.
+	 * @type {string}
+	 */
+	cwd;
+
+	/**
+	 * The filename of the file being linted.
+	 * @type {string}
+	 */
+	filename;
+
+	/**
+	 * The physical filename of the file being linted.
+	 * @type {string}
+	 */
+	physicalFilename;
+
+	/**
+	 * The source code of the file being linted.
+	 * @type {SourceCode}
+	 */
+	sourceCode;
+
+	/**
+	 * The parser options for the file being linted.
+	 * @type {Record<string, unknown>}
+	 * @deprecated Use `languageOptions` instead.
+	 */
+	parserOptions;
+
+	/**
+	 * The path to the parser used to parse this file.
+	 * @type {string}
+	 * @deprecated No longer supported.
+	 */
+	parserPath;
+
+	/**
+	 * The language options used when parsing this file.
+	 * @type {Record<string, unknown>}
+	 */
+	languageOptions;
+
+	/**
+	 * The settings for the file being linted.
+	 * @type {Record<string, unknown>}
+	 */
+	settings;
+
+	/**
+	 * Creates a new instance.
+	 * @param {Object} config The configuration object for the file context.
+	 * @param {string} config.cwd The current working directory.
+	 * @param {string} config.filename The filename of the file being linted.
+	 * @param {string} config.physicalFilename The physical filename of the file being linted.
+	 * @param {SourceCode} config.sourceCode The source code of the file being linted.
+	 * @param {Record<string, unknown>} config.parserOptions The parser options for the file being linted.
+	 * @param {string} config.parserPath The path to the parser used to parse this file.
+	 * @param {Record<string, unknown>} config.languageOptions The language options used when parsing this file.
+	 * @param {Record<string, unknown>} config.settings The settings for the file being linted.
+	 */
+	constructor({
+		cwd,
+		filename,
+		physicalFilename,
+		sourceCode,
+		parserOptions,
+		parserPath,
+		languageOptions,
+		settings,
+	}) {
+		this.cwd = cwd;
+		this.filename = filename;
+		this.physicalFilename = physicalFilename;
+		this.sourceCode = sourceCode;
+		this.parserOptions = parserOptions;
+		this.parserPath = parserPath;
+		this.languageOptions = languageOptions;
+		this.settings = settings;
+
+		Object.freeze(this);
+	}
+
+	/**
+	 * Gets the current working directory.
+	 * @returns {string} The current working directory.
+	 * @deprecated Use `cwd` instead.
+	 */
+	getCwd() {
+		return this.cwd;
+	}
+
+	/**
+	 * Gets the filename of the file being linted.
+	 * @returns {string} The filename of the file being linted.
+	 * @deprecated Use `filename` instead.
+	 */
+	getFilename() {
+		return this.filename;
+	}
+
+	/**
+	 * Gets the physical filename of the file being linted.
+	 * @returns {string} The physical filename of the file being linted.
+	 * @deprecated Use `physicalFilename` instead.
+	 */
+	getPhysicalFilename() {
+		return this.physicalFilename;
+	}
+
+	/**
+	 * Gets the source code of the file being linted.
+	 * @returns {SourceCode} The source code of the file being linted.
+	 * @deprecated Use `sourceCode` instead.
+	 */
+	getSourceCode() {
+		return this.sourceCode;
+	}
+
+	/**
+	 * Creates a new object with the current object as the prototype and
+	 * the specified properties as its own properties.
+	 * @param {Object} extension The properties to add to the new object.
+	 * @returns {FileContext} A new object with the current object as the prototype
+	 * and the specified properties as its own properties.
+	 */
+	extend(extension) {
+		return Object.freeze(Object.assign(Object.create(this), extension));
+	}
+}
+
+exports.FileContext = FileContext;

slider/node_modules/eslint/lib/linter/file-report.js

@@ -0,0 +1,608 @@
+/**
+ * @fileoverview A class to track messages reported by the linter for a file.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const assert = require("../shared/assert");
+const { RuleFixer } = require("./rule-fixer");
+const { interpolate } = require("./interpolate");
+const ruleReplacements = require("../../conf/replacements.json");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/** @typedef {import("../types").Linter.LintMessage} LintMessage */
+/** @typedef {import("../types").Linter.LintSuggestion} SuggestionResult */
+/** @typedef {import("@eslint/core").Language} Language */
+/** @typedef {import("@eslint/core").SourceLocation} SourceLocation */
+
+/**
+ * An error message description
+ * @typedef {Object} MessageDescriptor
+ * @property {ASTNode} [node] The reported node
+ * @property {Location} loc The location of the problem.
+ * @property {string} message The problem message.
+ * @property {Object} [data] Optional data to use to fill in placeholders in the
+ *      message.
+ * @property {Function} [fix] The function to call that creates a fix command.
+ * @property {Array<{desc?: string, messageId?: string, fix: Function}>} suggest Suggestion descriptions and functions to create a the associated fixes.
+ */
+
+/**
+ * @typedef {Object} LintProblem
+ * @property {string} ruleId The rule ID that reported the problem.
+ * @property {string} message The problem message.
+ * @property {SourceLocation} loc The location of the problem.
+ */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const DEFAULT_ERROR_LOC = {
+	start: { line: 1, column: 0 },
+	end: { line: 1, column: 1 },
+};
+
+/**
+ * Updates a given location based on the language offsets. This allows us to
+ * change 0-based locations to 1-based locations. We always want ESLint
+ * reporting lines and columns starting from 1.
+ * @todo Potentially this should be moved into a shared utility file.
+ * @param {Object} location The location to update.
+ * @param {number} location.line The starting line number.
+ * @param {number} location.column The starting column number.
+ * @param {number} [location.endLine] The ending line number.
+ * @param {number} [location.endColumn] The ending column number.
+ * @param {Language} language The language to use to adjust the location information.
+ * @returns {Object} The updated location.
+ */
+function updateLocationInformation(
+	{ line, column, endLine, endColumn },
+	language,
+) {
+	const columnOffset = language.columnStart === 1 ? 0 : 1;
+	const lineOffset = language.lineStart === 1 ? 0 : 1;
+
+	// calculate separately to account for undefined
+	const finalEndLine = endLine === void 0 ? endLine : endLine + lineOffset;
+	const finalEndColumn =
+		endColumn === void 0 ? endColumn : endColumn + columnOffset;
+
+	return {
+		line: line + lineOffset,
+		column: column + columnOffset,
+		endLine: finalEndLine,
+		endColumn: finalEndColumn,
+	};
+}
+
+/**
+ * creates a missing-rule message.
+ * @param {string} ruleId the ruleId to create
+ * @returns {string} created error message
+ * @private
+ */
+function createMissingRuleMessage(ruleId) {
+	return Object.hasOwn(ruleReplacements.rules, ruleId)
+		? `Rule '${ruleId}' was removed and replaced by: ${ruleReplacements.rules[ruleId].join(", ")}`
+		: `Definition for rule '${ruleId}' was not found.`;
+}
+
+/**
+ * creates a linting problem
+ * @param {LintProblem} options to create linting error
+ * @param {RuleSeverity} severity the error message to report
+ * @param {Language} language the language to use to adjust the location information.
+ * @returns {LintMessage} created problem, returns a missing-rule problem if only provided ruleId.
+ * @private
+ */
+function createLintingProblem(options, severity, language) {
+	const {
+		ruleId = null,
+		loc = DEFAULT_ERROR_LOC,
+		message = createMissingRuleMessage(options.ruleId),
+	} = options;
+
+	return {
+		ruleId,
+		message,
+		...updateLocationInformation(
+			{
+				line: loc.start.line,
+				column: loc.start.column,
+				endLine: loc.end.line,
+				endColumn: loc.end.column,
+			},
+			language,
+		),
+		severity,
+		nodeType: null,
+	};
+}
+
+/**
+ * Translates a multi-argument context.report() call into a single object argument call
+ * @param {...*} args A list of arguments passed to `context.report`
+ * @returns {MessageDescriptor} A normalized object containing report information
+ */
+function normalizeMultiArgReportCall(...args) {
+	// If there is one argument, it is considered to be a new-style call already.
+	if (args.length === 1) {
+		// Shallow clone the object to avoid surprises if reusing the descriptor
+		return Object.assign({}, args[0]);
+	}
+
+	// If the second argument is a string, the arguments are interpreted as [node, message, data, fix].
+	if (typeof args[1] === "string") {
+		return {
+			node: args[0],
+			message: args[1],
+			data: args[2],
+			fix: args[3],
+		};
+	}
+
+	// Otherwise, the arguments are interpreted as [node, loc, message, data, fix].
+	return {
+		node: args[0],
+		loc: args[1],
+		message: args[2],
+		data: args[3],
+		fix: args[4],
+	};
+}
+
+/**
+ * Asserts that either a loc or a node was provided, and the node is valid if it was provided.
+ * @param {MessageDescriptor} descriptor A descriptor to validate
+ * @returns {void}
+ * @throws AssertionError if neither a node nor a loc was provided, or if the node is not an object
+ */
+function assertValidNodeInfo(descriptor) {
+	if (descriptor.node) {
+		assert(typeof descriptor.node === "object", "Node must be an object");
+	} else {
+		assert(
+			descriptor.loc,
+			"Node must be provided when reporting error if location is not provided",
+		);
+	}
+}
+
+/**
+ * Normalizes a MessageDescriptor to always have a `loc` with `start` and `end` properties
+ * @param {MessageDescriptor} descriptor A descriptor for the report from a rule.
+ * @returns {{start: Location, end: (Location|null)}} An updated location that infers the `start` and `end` properties
+ * from the `node` of the original descriptor, or infers the `start` from the `loc` of the original descriptor.
+ */
+function normalizeReportLoc(descriptor) {
+	if (descriptor.loc.start) {
+		return descriptor.loc;
+	}
+	return { start: descriptor.loc, end: null };
+}
+
+/**
+ * Clones the given fix object.
+ * @param {Fix|null} fix The fix to clone.
+ * @returns {Fix|null} Deep cloned fix object or `null` if `null` or `undefined` was passed in.
+ */
+function cloneFix(fix) {
+	if (!fix) {
+		return null;
+	}
+
+	return {
+		range: [fix.range[0], fix.range[1]],
+		text: fix.text,
+	};
+}
+
+/**
+ * Check that a fix has a valid range.
+ * @param {Fix|null} fix The fix to validate.
+ * @returns {void}
+ */
+function assertValidFix(fix) {
+	if (fix) {
+		assert(
+			fix.range &&
+				typeof fix.range[0] === "number" &&
+				typeof fix.range[1] === "number",
+			`Fix has invalid range: ${JSON.stringify(fix, null, 2)}`,
+		);
+	}
+}
+
+/**
+ * Compares items in a fixes array by range.
+ * @param {Fix} a The first message.
+ * @param {Fix} b The second message.
+ * @returns {number} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareFixesByRange(a, b) {
+	return a.range[0] - b.range[0] || a.range[1] - b.range[1];
+}
+
+/**
+ * Merges the given fixes array into one.
+ * @param {Fix[]} fixes The fixes to merge.
+ * @param {SourceCode} sourceCode The source code object to get the text between fixes.
+ * @returns {{text: string, range: number[]}} The merged fixes
+ */
+function mergeFixes(fixes, sourceCode) {
+	for (const fix of fixes) {
+		assertValidFix(fix);
+	}
+
+	if (fixes.length === 0) {
+		return null;
+	}
+	if (fixes.length === 1) {
+		return cloneFix(fixes[0]);
+	}
+
+	fixes.sort(compareFixesByRange);
+
+	const originalText = sourceCode.text;
+	const start = fixes[0].range[0];
+	const end = fixes.at(-1).range[1];
+	let text = "";
+	let lastPos = Number.MIN_SAFE_INTEGER;
+
+	for (const fix of fixes) {
+		assert(
+			fix.range[0] >= lastPos,
+			"Fix objects must not be overlapped in a report.",
+		);
+
+		if (fix.range[0] >= 0) {
+			text += originalText.slice(
+				Math.max(0, start, lastPos),
+				fix.range[0],
+			);
+		}
+		text += fix.text;
+		lastPos = fix.range[1];
+	}
+	text += originalText.slice(Math.max(0, start, lastPos), end);
+
+	return { range: [start, end], text };
+}
+
+/**
+ * Gets one fix object from the given descriptor.
+ * If the descriptor retrieves multiple fixes, this merges those to one.
+ * @param {MessageDescriptor} descriptor The report descriptor.
+ * @param {SourceCode} sourceCode The source code object to get text between fixes.
+ * @returns {({text: string, range: number[]}|null)} The fix for the descriptor
+ */
+function normalizeFixes(descriptor, sourceCode) {
+	if (typeof descriptor.fix !== "function") {
+		return null;
+	}
+
+	const ruleFixer = new RuleFixer({ sourceCode });
+
+	// @type {null | Fix | Fix[] | IterableIterator<Fix>}
+	const fix = descriptor.fix(ruleFixer);
+
+	// Merge to one.
+	if (fix && Symbol.iterator in fix) {
+		return mergeFixes(Array.from(fix), sourceCode);
+	}
+
+	assertValidFix(fix);
+	return cloneFix(fix);
+}
+
+/**
+ * Gets an array of suggestion objects from the given descriptor.
+ * @param {MessageDescriptor} descriptor The report descriptor.
+ * @param {SourceCode} sourceCode The source code object to get text between fixes.
+ * @param {Object} messages Object of meta messages for the rule.
+ * @returns {Array<SuggestionResult>} The suggestions for the descriptor
+ */
+function mapSuggestions(descriptor, sourceCode, messages) {
+	if (!descriptor.suggest || !Array.isArray(descriptor.suggest)) {
+		return [];
+	}
+
+	return (
+		descriptor.suggest
+			.map(suggestInfo => {
+				const computedDesc =
+					suggestInfo.desc || messages[suggestInfo.messageId];
+
+				return {
+					...suggestInfo,
+					desc: interpolate(computedDesc, suggestInfo.data),
+					fix: normalizeFixes(suggestInfo, sourceCode),
+				};
+			})
+
+			// Remove suggestions that didn't provide a fix
+			.filter(({ fix }) => fix)
+	);
+}
+
+/**
+ * Creates information about the report from a descriptor
+ * @param {Object} options Information about the problem
+ * @param {string} options.ruleId Rule ID
+ * @param {(0|1|2)} options.severity Rule severity
+ * @param {(ASTNode|null)} options.node Node
+ * @param {string} options.message Error message
+ * @param {string} [options.messageId] The error message ID.
+ * @param {{start: SourceLocation, end: (SourceLocation|null)}} options.loc Start and end location
+ * @param {{text: string, range: (number[]|null)}} options.fix The fix object
+ * @param {Array<{text: string, range: (number[]|null)}>} options.suggestions The array of suggestions objects
+ * @param {Language} [options.language] The language to use to adjust line and column offsets.
+ * @returns {LintMessage} Information about the report
+ */
+function createProblem(options) {
+	const { language } = options;
+
+	// calculate offsets based on the language in use
+	const columnOffset = language.columnStart === 1 ? 0 : 1;
+	const lineOffset = language.lineStart === 1 ? 0 : 1;
+
+	const problem = {
+		ruleId: options.ruleId,
+		severity: options.severity,
+		message: options.message,
+		line: options.loc.start.line + lineOffset,
+		column: options.loc.start.column + columnOffset,
+		nodeType: (options.node && options.node.type) || null,
+	};
+
+	/*
+	 * If this isn’t in the conditional, some of the tests fail
+	 * because `messageId` is present in the problem object
+	 */
+	if (options.messageId) {
+		problem.messageId = options.messageId;
+	}
+
+	if (options.loc.end) {
+		problem.endLine = options.loc.end.line + lineOffset;
+		problem.endColumn = options.loc.end.column + columnOffset;
+	}
+
+	if (options.fix) {
+		problem.fix = options.fix;
+	}
+
+	if (options.suggestions && options.suggestions.length > 0) {
+		problem.suggestions = options.suggestions;
+	}
+
+	return problem;
+}
+
+/**
+ * Validates that suggestions are properly defined. Throws if an error is detected.
+ * @param {Array<{ desc?: string, messageId?: string }>} suggest The incoming suggest data.
+ * @param {Object} messages Object of meta messages for the rule.
+ * @returns {void}
+ */
+function validateSuggestions(suggest, messages) {
+	if (suggest && Array.isArray(suggest)) {
+		suggest.forEach(suggestion => {
+			if (suggestion.messageId) {
+				const { messageId } = suggestion;
+
+				if (!messages) {
+					throw new TypeError(
+						`context.report() called with a suggest option with a messageId '${messageId}', but no messages were present in the rule metadata.`,
+					);
+				}
+
+				if (!messages[messageId]) {
+					throw new TypeError(
+						`context.report() called with a suggest option with a messageId '${messageId}' which is not present in the 'messages' config: ${JSON.stringify(messages, null, 2)}`,
+					);
+				}
+
+				if (suggestion.desc) {
+					throw new TypeError(
+						"context.report() called with a suggest option that defines both a 'messageId' and an 'desc'. Please only pass one.",
+					);
+				}
+			} else if (!suggestion.desc) {
+				throw new TypeError(
+					"context.report() called with a suggest option that doesn't have either a `desc` or `messageId`",
+				);
+			}
+
+			if (typeof suggestion.fix !== "function") {
+				throw new TypeError(
+					`context.report() called with a suggest option without a fix function. See: ${suggestion}`,
+				);
+			}
+		});
+	}
+}
+
+/**
+ * Computes the message from a report descriptor.
+ * @param {MessageDescriptor} descriptor The report descriptor.
+ * @param {Object} messages Object of meta messages for the rule.
+ * @returns {string} The computed message.
+ * @throws {TypeError} If messageId is not found or both message and messageId are provided.
+ */
+function computeMessageFromDescriptor(descriptor, messages) {
+	if (descriptor.messageId) {
+		if (!messages) {
+			throw new TypeError(
+				"context.report() called with a messageId, but no messages were present in the rule metadata.",
+			);
+		}
+		const id = descriptor.messageId;
+
+		if (descriptor.message) {
+			throw new TypeError(
+				"context.report() called with a message and a messageId. Please only pass one.",
+			);
+		}
+		if (!messages || !Object.hasOwn(messages, id)) {
+			throw new TypeError(
+				`context.report() called with a messageId of '${id}' which is not present in the 'messages' config: ${JSON.stringify(messages, null, 2)}`,
+			);
+		}
+		return messages[id];
+	}
+
+	if (descriptor.message) {
+		return descriptor.message;
+	}
+
+	throw new TypeError(
+		"Missing `message` property in report() call; add a message that describes the linting problem.",
+	);
+}
+
+/**
+ * A report object that contains the messages reported the linter
+ * for a file.
+ */
+class FileReport {
+	/**
+	 * The messages reported by the linter for this file.
+	 * @type {LintMessage[]}
+	 */
+	messages = [];
+
+	/**
+	 * A rule mapper that maps rule IDs to their metadata.
+	 * @type {(string) => RuleDefinition}
+	 */
+	#ruleMapper;
+
+	/**
+	 * The source code object for the file.
+	 * @type {SourceCode}
+	 */
+	#sourceCode;
+
+	/**
+	 * The language to use to adjust line and column offsets.
+	 * @type {Language}
+	 */
+	#language;
+
+	/**
+	 * Whether to disable fixes for this report.
+	 * @type {boolean}
+	 */
+	#disableFixes;
+
+	/**
+	 * Creates a new FileReport instance.
+	 * @param {Object} options The options for the file report
+	 * @param {(string) => RuleDefinition} options.ruleMapper A rule mapper that maps rule IDs to their metadata.
+	 * @param {SourceCode} options.sourceCode The source code object for the file.
+	 * @param {Language} options.language The language to use to adjust line and column offsets.
+	 * @param {boolean} [options.disableFixes=false] Whether to disable fixes for this report.
+	 */
+	constructor({ ruleMapper, sourceCode, language, disableFixes = false }) {
+		this.#ruleMapper = ruleMapper;
+		this.#sourceCode = sourceCode;
+		this.#language = language;
+		this.#disableFixes = disableFixes;
+	}
+
+	/**
+	 * Adds a rule-generated message to the report.
+	 * @param {string} ruleId The rule ID that reported the problem.
+	 * @param {0|1|2} severity The severity of the problem (0 = off, 1 = warning, 2 = error).
+	 * @param {...*} args The arguments passed to `context.report()`.
+	 * @returns {LintMessage} The created message object.
+	 * @throws {TypeError} If the messageId is not found or both message and messageId are provided.
+	 * @throws {AssertionError} If the node is not an object or neither a node nor a loc is provided.
+	 */
+	addRuleMessage(ruleId, severity, ...args) {
+		const descriptor = normalizeMultiArgReportCall(...args);
+		const ruleDefinition = this.#ruleMapper(ruleId);
+		const messages = ruleDefinition?.meta?.messages;
+
+		assertValidNodeInfo(descriptor);
+
+		const computedMessage = computeMessageFromDescriptor(
+			descriptor,
+			messages,
+		);
+
+		validateSuggestions(descriptor.suggest, messages);
+
+		this.messages.push(
+			createProblem({
+				ruleId,
+				severity,
+				node: descriptor.node,
+				message: interpolate(computedMessage, descriptor.data),
+				messageId: descriptor.messageId,
+				loc: descriptor.loc
+					? normalizeReportLoc(descriptor)
+					: this.#sourceCode.getLoc(descriptor.node),
+				fix: this.#disableFixes
+					? null
+					: normalizeFixes(descriptor, this.#sourceCode),
+				suggestions: this.#disableFixes
+					? []
+					: mapSuggestions(descriptor, this.#sourceCode, messages),
+				language: this.#language,
+			}),
+		);
+
+		return this.messages.at(-1);
+	}
+
+	/**
+	 * Adds an error message to the report. Meant to be called outside of rules.
+	 * @param {LintProblem} descriptor The descriptor for the error message.
+	 * @returns {LintMessage} The created message object.
+	 */
+	addError(descriptor) {
+		const message = createLintingProblem(descriptor, 2, this.#language);
+		this.messages.push(message);
+		return message;
+	}
+
+	/**
+	 * Adds a fatal error message to the report. Meant to be called outside of rules.
+	 * @param {LintProblem} descriptor The descriptor for the fatal error message.
+	 * @returns {LintMessage} The created message object.
+	 */
+	addFatal(descriptor) {
+		const message = createLintingProblem(descriptor, 2, this.#language);
+		message.fatal = true;
+		this.messages.push(message);
+		return message;
+	}
+
+	/**
+	 * Adds a warning message to the report. Meant to be called outside of rules.
+	 * @param {LintProblem} descriptor The descriptor for the warning message.
+	 * @returns {LintMessage} The created message object.
+	 */
+	addWarning(descriptor) {
+		const message = createLintingProblem(descriptor, 1, this.#language);
+		this.messages.push(message);
+		return message;
+	}
+}
+
+module.exports = {
+	FileReport,
+	updateLocationInformation,
+};

slider/node_modules/eslint/lib/linter/index.js

@@ -0,0 +1,11 @@
+"use strict";
+
+const { Linter } = require("./linter");
+const SourceCodeFixer = require("./source-code-fixer");
+
+module.exports = {
+	Linter,
+
+	// For testers.
+	SourceCodeFixer,
+};

slider/node_modules/eslint/lib/linter/interpolate.js

@@ -0,0 +1,50 @@
+/**
+ * @fileoverview Interpolate keys from an object into a string with {{ }} markers.
+ * @author Jed Fox
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Returns a global expression matching placeholders in messages.
+ * @returns {RegExp} Global regular expression matching placeholders
+ */
+function getPlaceholderMatcher() {
+	return /\{\{([^{}]+)\}\}/gu;
+}
+
+/**
+ * Replaces {{ placeholders }} in the message with the provided data.
+ * Does not replace placeholders not available in the data.
+ * @param {string} text Original message with potential placeholders
+ * @param {Record<string, string>} data Map of placeholder name to its value
+ * @returns {string} Message with replaced placeholders
+ */
+function interpolate(text, data) {
+	if (!data) {
+		return text;
+	}
+
+	const matcher = getPlaceholderMatcher();
+
+	// Substitution content for any {{ }} markers.
+	return text.replace(matcher, (fullMatch, termWithWhitespace) => {
+		const term = termWithWhitespace.trim();
+
+		if (term in data) {
+			return data[term];
+		}
+
+		// Preserve old behavior: If parameter name not provided, don't replace it.
+		return fullMatch;
+	});
+}
+
+module.exports = {
+	getPlaceholderMatcher,
+	interpolate,
+};

slider/node_modules/eslint/lib/linter/rule-fixer.js

@@ -0,0 +1,169 @@
+/**
+ * @fileoverview An object that creates fix commands for rules.
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/**
+ * @import { SourceRange } from "@eslint/core";
+ */
+
+/* eslint class-methods-use-this: off -- Methods desired on instance */
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+// none!
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Creates a fix command that inserts text at the specified index in the source text.
+ * @param {number} index The 0-based index at which to insert the new text.
+ * @param {string} text The text to insert.
+ * @returns {Object} The fix command.
+ * @private
+ */
+function insertTextAt(index, text) {
+	return {
+		range: [index, index],
+		text,
+	};
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Creates code fixing commands for rules.
+ */
+class RuleFixer {
+	/**
+	 * The source code object representing the text to be fixed.
+	 * @type {SourceCode}
+	 */
+	#sourceCode;
+
+	/**
+	 * Creates a new instance.
+	 * @param {Object} options The options for the fixer.
+	 * @param {SourceCode} options.sourceCode The source code object representing the text to be fixed.
+	 */
+	constructor({ sourceCode }) {
+		this.#sourceCode = sourceCode;
+	}
+
+	/**
+	 * Creates a fix command that inserts text after the given node or token.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {ASTNode|Token} nodeOrToken The node or token to insert after.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	insertTextAfter(nodeOrToken, text) {
+		const range = this.#sourceCode.getRange(nodeOrToken);
+
+		return this.insertTextAfterRange(range, text);
+	}
+
+	/**
+	 * Creates a fix command that inserts text after the specified range in the source text.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {SourceRange} range The range to replace, first item is start of range, second
+	 *      is end of range.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	insertTextAfterRange(range, text) {
+		return insertTextAt(range[1], text);
+	}
+
+	/**
+	 * Creates a fix command that inserts text before the given node or token.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {ASTNode|Token} nodeOrToken The node or token to insert before.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	insertTextBefore(nodeOrToken, text) {
+		const range = this.#sourceCode.getRange(nodeOrToken);
+
+		return this.insertTextBeforeRange(range, text);
+	}
+
+	/**
+	 * Creates a fix command that inserts text before the specified range in the source text.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {SourceRange} range The range to replace, first item is start of range, second
+	 *      is end of range.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	insertTextBeforeRange(range, text) {
+		return insertTextAt(range[0], text);
+	}
+
+	/**
+	 * Creates a fix command that replaces text at the node or token.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {ASTNode|Token} nodeOrToken The node or token to remove.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	replaceText(nodeOrToken, text) {
+		const range = this.#sourceCode.getRange(nodeOrToken);
+
+		return this.replaceTextRange(range, text);
+	}
+
+	/**
+	 * Creates a fix command that replaces text at the specified range in the source text.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {SourceRange} range The range to replace, first item is start of range, second
+	 *      is end of range.
+	 * @param {string} text The text to insert.
+	 * @returns {Object} The fix command.
+	 */
+	replaceTextRange(range, text) {
+		return {
+			range,
+			text,
+		};
+	}
+
+	/**
+	 * Creates a fix command that removes the node or token from the source.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {ASTNode|Token} nodeOrToken The node or token to remove.
+	 * @returns {Object} The fix command.
+	 */
+	remove(nodeOrToken) {
+		const range = this.#sourceCode.getRange(nodeOrToken);
+
+		return this.removeRange(range);
+	}
+
+	/**
+	 * Creates a fix command that removes the specified range of text from the source.
+	 * The fix is not applied until applyFixes() is called.
+	 * @param {SourceRange} range The range to remove, first item is start of range, second
+	 *      is end of range.
+	 * @returns {Object} The fix command.
+	 */
+	removeRange(range) {
+		return {
+			range,
+			text: "",
+		};
+	}
+}
+
+module.exports = { RuleFixer };

slider/node_modules/eslint/lib/linter/rules.js

@@ -0,0 +1,71 @@
+/**
+ * @fileoverview Defines a storage for rules.
+ * @author Nicholas C. Zakas
+ * @author aladdin-add
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const builtInRules = require("../rules");
+
+//------------------------------------------------------------------------------
+// Typedefs
+//------------------------------------------------------------------------------
+
+/** @typedef {import("../types").Rule.RuleModule} Rule */
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * A storage for rules.
+ */
+class Rules {
+	constructor() {
+		this._rules = Object.create(null);
+	}
+
+	/**
+	 * Registers a rule module for rule id in storage.
+	 * @param {string} ruleId Rule id (file name).
+	 * @param {Rule} rule Rule object.
+	 * @returns {void}
+	 */
+	define(ruleId, rule) {
+		this._rules[ruleId] = rule;
+	}
+
+	/**
+	 * Access rule handler by id (file name).
+	 * @param {string} ruleId Rule id (file name).
+	 * @returns {Rule} Rule object.
+	 */
+	get(ruleId) {
+		if (typeof this._rules[ruleId] === "string") {
+			this.define(ruleId, require(this._rules[ruleId]));
+		}
+		if (this._rules[ruleId]) {
+			return this._rules[ruleId];
+		}
+		if (builtInRules.has(ruleId)) {
+			return builtInRules.get(ruleId);
+		}
+
+		return null;
+	}
+
+	*[Symbol.iterator]() {
+		yield* builtInRules;
+
+		for (const ruleId of Object.keys(this._rules)) {
+			yield [ruleId, this.get(ruleId)];
+		}
+	}
+}
+
+module.exports = Rules;

slider/node_modules/eslint/lib/linter/source-code-fixer.js

@@ -0,0 +1,154 @@
+/**
+ * @fileoverview An object that caches and applies source code fixes.
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const debug = require("debug")("eslint:source-code-fixer");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const BOM = "\uFEFF";
+
+/**
+ * Compares items in a messages array by range.
+ * @param {Message} a The first message.
+ * @param {Message} b The second message.
+ * @returns {number} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareMessagesByFixRange(a, b) {
+	return a.fix.range[0] - b.fix.range[0] || a.fix.range[1] - b.fix.range[1];
+}
+
+/**
+ * Compares items in a messages array by line and column.
+ * @param {Message} a The first message.
+ * @param {Message} b The second message.
+ * @returns {number} -1 if a comes before b, 1 if a comes after b, 0 if equal.
+ * @private
+ */
+function compareMessagesByLocation(a, b) {
+	return a.line - b.line || a.column - b.column;
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Utility for apply fixes to source code.
+ * @constructor
+ */
+function SourceCodeFixer() {
+	Object.freeze(this);
+}
+
+/**
+ * Applies the fixes specified by the messages to the given text. Tries to be
+ * smart about the fixes and won't apply fixes over the same area in the text.
+ * @param {string} sourceText The text to apply the changes to.
+ * @param {Message[]} messages The array of messages reported by ESLint.
+ * @param {boolean|Function} [shouldFix=true] Determines whether each message should be fixed
+ * @returns {Object} An object containing the fixed text and any unfixed messages.
+ */
+SourceCodeFixer.applyFixes = function (sourceText, messages, shouldFix) {
+	debug("Applying fixes");
+
+	if (shouldFix === false) {
+		debug("shouldFix parameter was false, not attempting fixes");
+		return {
+			fixed: false,
+			messages,
+			output: sourceText,
+		};
+	}
+
+	// clone the array
+	const remainingMessages = [],
+		fixes = [],
+		bom = sourceText.startsWith(BOM) ? BOM : "",
+		text = bom ? sourceText.slice(1) : sourceText;
+	let lastPos = Number.NEGATIVE_INFINITY,
+		output = bom;
+
+	/**
+	 * Try to use the 'fix' from a problem.
+	 * @param {Message} problem The message object to apply fixes from
+	 * @returns {boolean} Whether fix was successfully applied
+	 */
+	function attemptFix(problem) {
+		const fix = problem.fix;
+		const start = fix.range[0];
+		const end = fix.range[1];
+
+		// Remain it as a problem if it's overlapped or it's a negative range
+		if (lastPos >= start || start > end) {
+			remainingMessages.push(problem);
+			return false;
+		}
+
+		// Remove BOM.
+		if (
+			(start < 0 && end >= 0) ||
+			(start === 0 && fix.text.startsWith(BOM))
+		) {
+			output = "";
+		}
+
+		// Make output to this fix.
+		output += text.slice(Math.max(0, lastPos), Math.max(0, start));
+		output += fix.text;
+		lastPos = end;
+		return true;
+	}
+
+	messages.forEach(problem => {
+		if (Object.hasOwn(problem, "fix") && problem.fix) {
+			fixes.push(problem);
+		} else {
+			remainingMessages.push(problem);
+		}
+	});
+
+	if (fixes.length) {
+		debug("Found fixes to apply");
+		let fixesWereApplied = false;
+
+		for (const problem of fixes.sort(compareMessagesByFixRange)) {
+			if (typeof shouldFix !== "function" || shouldFix(problem)) {
+				attemptFix(problem);
+
+				/*
+				 * The only time attemptFix will fail is if a previous fix was
+				 * applied which conflicts with it.  So we can mark this as true.
+				 */
+				fixesWereApplied = true;
+			} else {
+				remainingMessages.push(problem);
+			}
+		}
+		output += text.slice(Math.max(0, lastPos));
+
+		return {
+			fixed: fixesWereApplied,
+			messages: remainingMessages.sort(compareMessagesByLocation),
+			output,
+		};
+	}
+
+	debug("No fixes to apply");
+	return {
+		fixed: false,
+		messages,
+		output: bom + text,
+	};
+};
+
+module.exports = SourceCodeFixer;

slider/node_modules/eslint/lib/linter/source-code-traverser.js

@@ -0,0 +1,327 @@
+/**
+ * @fileoverview Traverser for SourceCode objects.
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const { parse, matches } = require("./esquery");
+const vk = require("eslint-visitor-keys");
+
+//-----------------------------------------------------------------------------
+// Typedefs
+//-----------------------------------------------------------------------------
+
+/**
+ * @import { ESQueryParsedSelector } from "./esquery.js";
+ * @import { Language, SourceCode } from "@eslint/core";
+ * @import { SourceCodeVisitor } from "./source-code-visitor.js";
+ */
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const STEP_KIND_VISIT = 1;
+const STEP_KIND_CALL = 2;
+
+/**
+ * Compares two ESQuery selectors by specificity.
+ * @param {ESQueryParsedSelector} a The first selector to compare.
+ * @param {ESQueryParsedSelector} b The second selector to compare.
+ * @returns {number} A negative number if `a` is less specific than `b` or they are equally specific and `a` <= `b` alphabetically, a positive number if `a` is more specific than `b`.
+ */
+function compareSpecificity(a, b) {
+	return a.compare(b);
+}
+
+/**
+ * Helper to wrap ESQuery operations.
+ */
+class ESQueryHelper {
+	/**
+	 * Creates a new instance.
+	 * @param {SourceCodeVisitor} visitor The visitor containing the functions to call.
+	 * @param {ESQueryOptions} esqueryOptions `esquery` options for traversing custom nodes.
+	 * @returns {NodeEventGenerator} new instance
+	 */
+	constructor(visitor, esqueryOptions) {
+		/**
+		 * The emitter to use during traversal.
+		 * @type {SourceCodeVisitor}
+		 */
+		this.visitor = visitor;
+
+		/**
+		 * The options for `esquery` to use during matching.
+		 * @type {ESQueryOptions}
+		 */
+		this.esqueryOptions = esqueryOptions;
+
+		/**
+		 * A map of node type to selectors targeting that node type on the
+		 * enter phase of traversal.
+		 * @type {Map<string, ESQueryParsedSelector[]>}
+		 */
+		this.enterSelectorsByNodeType = new Map();
+
+		/**
+		 * A map of node type to selectors targeting that node type on the
+		 * exit phase of traversal.
+		 * @type {Map<string, ESQueryParsedSelector[]>}
+		 */
+		this.exitSelectorsByNodeType = new Map();
+
+		/**
+		 * An array of selectors that match any node type on the
+		 * enter phase of traversal.
+		 * @type {ESQueryParsedSelector[]}
+		 */
+		this.anyTypeEnterSelectors = [];
+
+		/**
+		 * An array of selectors that match any node type on the
+		 * exit phase of traversal.
+		 * @type {ESQueryParsedSelector[]}
+		 */
+		this.anyTypeExitSelectors = [];
+
+		visitor.forEachName(rawSelector => {
+			const selector = parse(rawSelector);
+
+			/*
+			 * If this selector has identified specific node types,
+			 * add it to the map for these node types for faster lookup.
+			 */
+			if (selector.nodeTypes) {
+				const typeMap = selector.isExit
+					? this.exitSelectorsByNodeType
+					: this.enterSelectorsByNodeType;
+
+				selector.nodeTypes.forEach(nodeType => {
+					if (!typeMap.has(nodeType)) {
+						typeMap.set(nodeType, []);
+					}
+					typeMap.get(nodeType).push(selector);
+				});
+				return;
+			}
+
+			/*
+			 * Remaining selectors are added to the "any type" selectors
+			 * list for the appropriate phase of traversal. This ensures
+			 * that all selectors will still be applied even if no
+			 * specific node type is matched.
+			 */
+			const selectors = selector.isExit
+				? this.anyTypeExitSelectors
+				: this.anyTypeEnterSelectors;
+
+			selectors.push(selector);
+		});
+
+		// sort all selectors by specificity for prioritizing call order
+		this.anyTypeEnterSelectors.sort(compareSpecificity);
+		this.anyTypeExitSelectors.sort(compareSpecificity);
+		this.enterSelectorsByNodeType.forEach(selectorList =>
+			selectorList.sort(compareSpecificity),
+		);
+		this.exitSelectorsByNodeType.forEach(selectorList =>
+			selectorList.sort(compareSpecificity),
+		);
+	}
+
+	/**
+	 * Checks if a node matches a given selector.
+	 * @param {ASTNode} node The node to check
+	 * @param {ASTNode[]} ancestry The ancestry of the node being checked.
+	 * @param {ESQueryParsedSelector} selector An AST selector descriptor
+	 * @returns {boolean} `true` if the selector matches the node, `false` otherwise
+	 */
+	matches(node, ancestry, selector) {
+		return matches(node, selector.root, ancestry, this.esqueryOptions);
+	}
+
+	/**
+	 * Calculates all appropriate selectors to a node, in specificity order
+	 * @param {ASTNode} node The node to check
+	 * @param {ASTNode[]} ancestry The ancestry of the node being checked.
+	 * @param {boolean} isExit `false` if the node is currently being entered, `true` if it's currently being exited
+	 * @returns {string[]} An array of selectors that match the node.
+	 */
+	calculateSelectors(node, ancestry, isExit) {
+		const nodeTypeKey = this.esqueryOptions?.nodeTypeKey || "type";
+		const selectors = [];
+
+		/*
+		 * Get the selectors that may match this node. First, check
+		 * to see if the node type has specific selectors,
+		 * then gather the "any type" selectors.
+		 */
+		const selectorsByNodeType =
+			(isExit
+				? this.exitSelectorsByNodeType
+				: this.enterSelectorsByNodeType
+			).get(node[nodeTypeKey]) || [];
+		const anyTypeSelectors = isExit
+			? this.anyTypeExitSelectors
+			: this.anyTypeEnterSelectors;
+
+		/*
+		 * selectorsByNodeType and anyTypeSelectors were already sorted by specificity in the constructor.
+		 * Iterate through each of them, applying selectors in the right order.
+		 */
+		let selectorsByNodeTypeIndex = 0;
+		let anyTypeSelectorsIndex = 0;
+
+		while (
+			selectorsByNodeTypeIndex < selectorsByNodeType.length ||
+			anyTypeSelectorsIndex < anyTypeSelectors.length
+		) {
+			/*
+			 * If we've already exhausted the selectors for this node type,
+			 * or if the next any type selector is more specific than the
+			 * next selector for this node type, apply the any type selector.
+			 */
+			const hasMoreNodeTypeSelectors =
+				selectorsByNodeTypeIndex < selectorsByNodeType.length;
+			const hasMoreAnyTypeSelectors =
+				anyTypeSelectorsIndex < anyTypeSelectors.length;
+			const anyTypeSelector = anyTypeSelectors[anyTypeSelectorsIndex];
+			const nodeTypeSelector =
+				selectorsByNodeType[selectorsByNodeTypeIndex];
+
+			// Only compare specificity if both selectors exist
+			const isAnyTypeSelectorLessSpecific =
+				hasMoreAnyTypeSelectors &&
+				hasMoreNodeTypeSelectors &&
+				anyTypeSelector.compare(nodeTypeSelector) < 0;
+
+			if (!hasMoreNodeTypeSelectors || isAnyTypeSelectorLessSpecific) {
+				anyTypeSelectorsIndex++;
+
+				if (this.matches(node, ancestry, anyTypeSelector)) {
+					selectors.push(anyTypeSelector.source);
+				}
+			} else {
+				selectorsByNodeTypeIndex++;
+
+				if (this.matches(node, ancestry, nodeTypeSelector)) {
+					selectors.push(nodeTypeSelector.source);
+				}
+			}
+		}
+
+		return selectors;
+	}
+}
+
+//------------------------------------------------------------------------------
+// Public Interface
+//------------------------------------------------------------------------------
+
+/**
+ * Traverses source code and ensures that visitor methods are called when
+ * entering and leaving each node.
+ */
+class SourceCodeTraverser {
+	/**
+	 * The language of the source code being traversed.
+	 * @type {Language}
+	 */
+	#language;
+
+	/**
+	 * Map of languages to instances of this class.
+	 * @type {WeakMap<Language, SourceCodeTraverser>}
+	 */
+	static instances = new WeakMap();
+
+	/**
+	 * Creates a new instance.
+	 * @param {Language} language The language of the source code being traversed.
+	 */
+	constructor(language) {
+		this.#language = language;
+	}
+
+	static getInstance(language) {
+		if (!this.instances.has(language)) {
+			this.instances.set(language, new this(language));
+		}
+
+		return this.instances.get(language);
+	}
+
+	/**
+	 * Traverses the given source code synchronously.
+	 * @param {SourceCode} sourceCode The source code to traverse.
+	 * @param {SourceCodeVisitor} visitor The emitter to use for events.
+	 * @param {Object} options Options for traversal.
+	 * @param {ReturnType<SourceCode["traverse"]>} options.steps The steps to take during traversal.
+	 * @returns {void}
+	 * @throws {Error} If an error occurs during traversal.
+	 */
+	traverseSync(sourceCode, visitor, { steps } = {}) {
+		const esquery = new ESQueryHelper(visitor, {
+			visitorKeys: sourceCode.visitorKeys ?? this.#language.visitorKeys,
+			fallback: vk.getKeys,
+			matchClass: this.#language.matchesSelectorClass ?? (() => false),
+			nodeTypeKey: this.#language.nodeTypeKey,
+		});
+
+		const currentAncestry = [];
+
+		for (const step of steps ?? sourceCode.traverse()) {
+			switch (step.kind) {
+				case STEP_KIND_VISIT: {
+					try {
+						if (step.phase === 1) {
+							esquery
+								.calculateSelectors(
+									step.target,
+									currentAncestry,
+									false,
+								)
+								.forEach(selector => {
+									visitor.callSync(selector, step.target);
+								});
+							currentAncestry.unshift(step.target);
+						} else {
+							currentAncestry.shift();
+							esquery
+								.calculateSelectors(
+									step.target,
+									currentAncestry,
+									true,
+								)
+								.forEach(selector => {
+									visitor.callSync(selector, step.target);
+								});
+						}
+					} catch (err) {
+						err.currentNode = step.target;
+						throw err;
+					}
+					break;
+				}
+
+				case STEP_KIND_CALL: {
+					visitor.callSync(step.target, ...step.args);
+					break;
+				}
+
+				default:
+					throw new Error(
+						`Invalid traversal step found: "${step.kind}".`,
+					);
+			}
+		}
+	}
+}
+
+module.exports = { SourceCodeTraverser };

slider/node_modules/eslint/lib/linter/source-code-visitor.js

@@ -0,0 +1,81 @@
+/**
+ * @fileoverview SourceCodeVisitor class
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Helpers
+//-----------------------------------------------------------------------------
+
+const emptyArray = Object.freeze([]);
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * A structure to hold a list of functions to call for a given name.
+ * This is used to allow multiple rules to register functions for a given name
+ * without having to know about each other.
+ */
+class SourceCodeVisitor {
+	/**
+	 * The functions to call for a given name.
+	 * @type {Map<string, Function[]>}
+	 */
+	#functions = new Map();
+
+	/**
+	 * Adds a function to the list of functions to call for a given name.
+	 * @param {string} name The name of the function to call.
+	 * @param {Function} func The function to call.
+	 * @returns {void}
+	 */
+	add(name, func) {
+		if (this.#functions.has(name)) {
+			this.#functions.get(name).push(func);
+		} else {
+			this.#functions.set(name, [func]);
+		}
+	}
+
+	/**
+	 * Gets the list of functions to call for a given name.
+	 * @param {string} name The name of the function to call.
+	 * @returns {Function[]} The list of functions to call.
+	 */
+	get(name) {
+		if (this.#functions.has(name)) {
+			return this.#functions.get(name);
+		}
+
+		return emptyArray;
+	}
+
+	/**
+	 * Iterates over all names and calls the callback with the name.
+	 * @param {(name:string) => void} callback The callback to call for each name.
+	 * @returns {void}
+	 */
+	forEachName(callback) {
+		this.#functions.forEach((funcs, name) => {
+			callback(name);
+		});
+	}
+
+	/**
+	 * Calls the functions for a given name with the given arguments.
+	 * @param {string} name The name of the function to call.
+	 * @param {any[]} args The arguments to pass to the function.
+	 * @returns {void}
+	 */
+	callSync(name, ...args) {
+		if (this.#functions.has(name)) {
+			this.#functions.get(name).forEach(func => func(...args));
+		}
+	}
+}
+
+module.exports = { SourceCodeVisitor };

slider/node_modules/eslint/lib/linter/timing.js

@@ -0,0 +1,172 @@
+/**
+ * @fileoverview Tracks performance of individual rules.
+ * @author Brandon Mills
+ */
+
+"use strict";
+
+const { startTime, endTime } = require("../shared/stats");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/* c8 ignore next */
+/**
+ * Align the string to left
+ * @param {string} str string to evaluate
+ * @param {number} len length of the string
+ * @param {string} ch delimiter character
+ * @returns {string} modified string
+ * @private
+ */
+function alignLeft(str, len, ch) {
+	return str + new Array(len - str.length + 1).join(ch || " ");
+}
+
+/* c8 ignore next */
+/**
+ * Align the string to right
+ * @param {string} str string to evaluate
+ * @param {number} len length of the string
+ * @param {string} ch delimiter character
+ * @returns {string} modified string
+ * @private
+ */
+function alignRight(str, len, ch) {
+	return new Array(len - str.length + 1).join(ch || " ") + str;
+}
+
+//------------------------------------------------------------------------------
+// Module definition
+//------------------------------------------------------------------------------
+
+const enabled = !!process.env.TIMING;
+
+const HEADERS = ["Rule", "Time (ms)", "Relative"];
+const ALIGN = [alignLeft, alignRight, alignRight];
+
+/**
+ * Decide how many rules to show in the output list.
+ * @returns {number} the number of rules to show
+ */
+function getListSize() {
+	const MINIMUM_SIZE = 10;
+
+	if (typeof process.env.TIMING !== "string") {
+		return MINIMUM_SIZE;
+	}
+
+	if (process.env.TIMING.toLowerCase() === "all") {
+		return Number.POSITIVE_INFINITY;
+	}
+
+	const TIMING_ENV_VAR_AS_INTEGER = Number.parseInt(process.env.TIMING, 10);
+
+	return TIMING_ENV_VAR_AS_INTEGER > 10
+		? TIMING_ENV_VAR_AS_INTEGER
+		: MINIMUM_SIZE;
+}
+
+/* c8 ignore next */
+/**
+ * display the data
+ * @param {Object} data Data object to be displayed
+ * @returns {void} prints modified string with console.log
+ * @private
+ */
+function display(data) {
+	let total = 0;
+	const rows = Object.keys(data)
+		.map(key => {
+			const time = data[key];
+
+			total += time;
+			return [key, time];
+		})
+		.sort((a, b) => b[1] - a[1])
+		.slice(0, getListSize());
+
+	rows.forEach(row => {
+		row.push(`${((row[1] * 100) / total).toFixed(1)}%`);
+		row[1] = row[1].toFixed(3);
+	});
+
+	rows.unshift(HEADERS);
+
+	const widths = [];
+
+	rows.forEach(row => {
+		const len = row.length;
+
+		for (let i = 0; i < len; i++) {
+			const n = row[i].length;
+
+			if (!widths[i] || n > widths[i]) {
+				widths[i] = n;
+			}
+		}
+	});
+
+	const table = rows.map(row =>
+		row.map((cell, index) => ALIGN[index](cell, widths[index])).join(" | "),
+	);
+
+	table.splice(
+		1,
+		0,
+		widths
+			.map((width, index) => {
+				const extraAlignment =
+					index !== 0 && index !== widths.length - 1 ? 2 : 1;
+
+				return ALIGN[index](":", width + extraAlignment, "-");
+			})
+			.join("|"),
+	);
+
+	console.log(table.join("\n")); // eslint-disable-line no-console -- Debugging function
+}
+
+/* c8 ignore next */
+module.exports = (function () {
+	const data = Object.create(null);
+
+	/**
+	 * Time the run
+	 * @param {any} key key from the data object
+	 * @param {Function} fn function to be called
+	 * @param {boolean} stats if 'stats' is true, return the result and the time difference
+	 * @returns {Function} function to be executed
+	 * @private
+	 */
+	function time(key, fn, stats) {
+		return function (...args) {
+			const t = startTime();
+			const result = fn(...args);
+			const tdiff = endTime(t);
+
+			if (enabled) {
+				if (typeof data[key] === "undefined") {
+					data[key] = 0;
+				}
+
+				data[key] += tdiff;
+			}
+
+			return stats ? { result, tdiff } : result;
+		};
+	}
+
+	if (enabled) {
+		process.on("exit", () => {
+			display(data);
+		});
+	}
+
+	return {
+		time,
+		enabled,
+		getListSize,
+	};
+})();

slider/node_modules/eslint/lib/linter/vfile.js

@@ -0,0 +1,115 @@
+/**
+ * @fileoverview Virtual file
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//-----------------------------------------------------------------------------
+// Type Definitions
+//-----------------------------------------------------------------------------
+
+/** @typedef {import("@eslint/core").File} File */
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines if a given value has a byte order mark (BOM).
+ * @param {string|Uint8Array} value The value to check.
+ * @returns {boolean} `true` if the value has a BOM, `false` otherwise.
+ */
+function hasUnicodeBOM(value) {
+	return typeof value === "string"
+		? value.charCodeAt(0) === 0xfeff
+		: value[0] === 0xef && value[1] === 0xbb && value[2] === 0xbf;
+}
+
+/**
+ * Strips Unicode BOM from the given value.
+ * @param {string|Uint8Array} value The value to remove the BOM from.
+ * @returns {string|Uint8Array} The stripped value.
+ */
+function stripUnicodeBOM(value) {
+	if (!hasUnicodeBOM(value)) {
+		return value;
+	}
+
+	if (typeof value === "string") {
+		/*
+		 * Check Unicode BOM.
+		 * In JavaScript, string data is stored as UTF-16, so BOM is 0xFEFF.
+		 * http://www.ecma-international.org/ecma-262/6.0/#sec-unicode-format-control-characters
+		 */
+		return value.slice(1);
+	}
+
+	/*
+	 * In a Uint8Array, the BOM is represented by three bytes: 0xEF, 0xBB, and 0xBF,
+	 * so we can just remove the first three bytes.
+	 */
+	return value.slice(3);
+}
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * Represents a virtual file inside of ESLint.
+ * @implements {File}
+ */
+class VFile {
+	/**
+	 * The file path including any processor-created virtual path.
+	 * @type {string}
+	 * @readonly
+	 */
+	path;
+
+	/**
+	 * The file path on disk.
+	 * @type {string}
+	 * @readonly
+	 */
+	physicalPath;
+
+	/**
+	 * The file contents.
+	 * @type {string|Uint8Array}
+	 * @readonly
+	 */
+	body;
+
+	/**
+	 * The raw body of the file, including a BOM if present.
+	 * @type {string|Uint8Array}
+	 * @readonly
+	 */
+	rawBody;
+
+	/**
+	 * Indicates whether the file has a byte order mark (BOM).
+	 * @type {boolean}
+	 * @readonly
+	 */
+	bom;
+
+	/**
+	 * Creates a new instance.
+	 * @param {string} path The file path.
+	 * @param {string|Uint8Array} body The file contents.
+	 * @param {Object} [options] Additional options.
+	 * @param {string} [options.physicalPath] The file path on disk.
+	 */
+	constructor(path, body, { physicalPath } = {}) {
+		this.path = path;
+		this.physicalPath = physicalPath ?? path;
+		this.bom = hasUnicodeBOM(body);
+		this.body = stripUnicodeBOM(body);
+		this.rawBody = body;
+	}
+}
+
+module.exports = { VFile };