Add components

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

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+/**
+ * @fileoverview Rule to flag use of parseInt without a radix argument
+ * @author James Allardice
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const MODE_ALWAYS = "always",
+	MODE_AS_NEEDED = "as-needed";
+
+const validRadixValues = new Set(
+	Array.from({ length: 37 - 2 }, (_, index) => index + 2),
+);
+
+/**
+ * Checks whether a given variable is shadowed or not.
+ * @param {eslint-scope.Variable} variable A variable to check.
+ * @returns {boolean} `true` if the variable is shadowed.
+ */
+function isShadowed(variable) {
+	return variable.defs.length >= 1;
+}
+
+/**
+ * Checks whether a given node is a MemberExpression of `parseInt` method or not.
+ * @param {ASTNode} node A node to check.
+ * @returns {boolean} `true` if the node is a MemberExpression of `parseInt`
+ *      method.
+ */
+function isParseIntMethod(node) {
+	return (
+		node.type === "MemberExpression" &&
+		!node.computed &&
+		node.property.type === "Identifier" &&
+		node.property.name === "parseInt"
+	);
+}
+
+/**
+ * Checks whether a given node is a valid value of radix or not.
+ *
+ * The following values are invalid.
+ *
+ * - A literal except integers between 2 and 36.
+ * - undefined.
+ * @param {ASTNode} radix A node of radix to check.
+ * @returns {boolean} `true` if the node is valid.
+ */
+function isValidRadix(radix) {
+	return !(
+		(radix.type === "Literal" && !validRadixValues.has(radix.value)) ||
+		(radix.type === "Identifier" && radix.name === "undefined")
+	);
+}
+
+/**
+ * Checks whether a given node is a default value of radix or not.
+ * @param {ASTNode} radix A node of radix to check.
+ * @returns {boolean} `true` if the node is the literal node of `10`.
+ */
+function isDefaultRadix(radix) {
+	return radix.type === "Literal" && radix.value === 10;
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		defaultOptions: [MODE_ALWAYS],
+
+		docs: {
+			description:
+				"Enforce the consistent use of the radix argument when using `parseInt()`",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/radix",
+		},
+
+		hasSuggestions: true,
+
+		schema: [
+			{
+				enum: ["always", "as-needed"],
+			},
+		],
+
+		messages: {
+			missingParameters: "Missing parameters.",
+			redundantRadix: "Redundant radix parameter.",
+			missingRadix: "Missing radix parameter.",
+			invalidRadix:
+				"Invalid radix parameter, must be an integer between 2 and 36.",
+			addRadixParameter10:
+				"Add radix parameter `10` for parsing decimal numbers.",
+		},
+	},
+
+	create(context) {
+		const [mode] = context.options;
+		const sourceCode = context.sourceCode;
+
+		/**
+		 * Checks the arguments of a given CallExpression node and reports it if it
+		 * offends this rule.
+		 * @param {ASTNode} node A CallExpression node to check.
+		 * @returns {void}
+		 */
+		function checkArguments(node) {
+			const args = node.arguments;
+
+			switch (args.length) {
+				case 0:
+					context.report({
+						node,
+						messageId: "missingParameters",
+					});
+					break;
+
+				case 1:
+					if (mode === MODE_ALWAYS) {
+						context.report({
+							node,
+							messageId: "missingRadix",
+							suggest: [
+								{
+									messageId: "addRadixParameter10",
+									fix(fixer) {
+										const tokens =
+											sourceCode.getTokens(node);
+										const lastToken = tokens.at(-1); // Parenthesis.
+										const secondToLastToken = tokens.at(-2); // May or may not be a comma.
+										const hasTrailingComma =
+											secondToLastToken.type ===
+												"Punctuator" &&
+											secondToLastToken.value === ",";
+
+										return fixer.insertTextBefore(
+											lastToken,
+											hasTrailingComma ? " 10," : ", 10",
+										);
+									},
+								},
+							],
+						});
+					}
+					break;
+
+				default:
+					if (mode === MODE_AS_NEEDED && isDefaultRadix(args[1])) {
+						context.report({
+							node,
+							messageId: "redundantRadix",
+						});
+					} else if (!isValidRadix(args[1])) {
+						context.report({
+							node,
+							messageId: "invalidRadix",
+						});
+					}
+					break;
+			}
+		}
+
+		return {
+			"Program:exit"(node) {
+				const scope = sourceCode.getScope(node);
+				let variable;
+
+				// Check `parseInt()`
+				variable = astUtils.getVariableByName(scope, "parseInt");
+				if (variable && !isShadowed(variable)) {
+					variable.references.forEach(reference => {
+						const idNode = reference.identifier;
+
+						if (astUtils.isCallee(idNode)) {
+							checkArguments(idNode.parent);
+						}
+					});
+				}
+
+				// Check `Number.parseInt()`
+				variable = astUtils.getVariableByName(scope, "Number");
+				if (variable && !isShadowed(variable)) {
+					variable.references.forEach(reference => {
+						const parentNode = reference.identifier.parent;
+						const maybeCallee =
+							parentNode.parent.type === "ChainExpression"
+								? parentNode.parent
+								: parentNode;
+
+						if (
+							isParseIntMethod(parentNode) &&
+							astUtils.isCallee(maybeCallee)
+						) {
+							checkArguments(maybeCallee.parent);
+						}
+					});
+				}
+			},
+		};
+	},
+};