Add components

slider/node_modules/eslint/lib/rules/no-inner-declarations.js

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+/**
+ * @fileoverview Rule to enforce declarations in program or function body root.
+ * @author Brandon Mills
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const validParent = new Set([
+	"Program",
+	"StaticBlock",
+	"ExportNamedDeclaration",
+	"ExportDefaultDeclaration",
+]);
+const validBlockStatementParent = new Set([
+	"FunctionDeclaration",
+	"FunctionExpression",
+	"ArrowFunctionExpression",
+]);
+
+/**
+ * Finds the nearest enclosing context where this rule allows declarations and returns its description.
+ * @param {ASTNode} node Node to search from.
+ * @returns {string} Description. One of "program", "function body", "class static block body".
+ */
+function getAllowedBodyDescription(node) {
+	let { parent } = node;
+
+	while (parent) {
+		if (parent.type === "StaticBlock") {
+			return "class static block body";
+		}
+
+		if (astUtils.isFunction(parent)) {
+			return "function body";
+		}
+
+		({ parent } = parent);
+	}
+
+	return "program";
+}
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "problem",
+
+		defaultOptions: ["functions", { blockScopedFunctions: "allow" }],
+
+		docs: {
+			description:
+				"Disallow variable or `function` declarations in nested blocks",
+			recommended: false,
+			url: "https://eslint.org/docs/latest/rules/no-inner-declarations",
+		},
+
+		schema: [
+			{
+				enum: ["functions", "both"],
+			},
+			{
+				type: "object",
+				properties: {
+					blockScopedFunctions: {
+						enum: ["allow", "disallow"],
+					},
+				},
+				additionalProperties: false,
+			},
+		],
+
+		messages: {
+			moveDeclToRoot: "Move {{type}} declaration to {{body}} root.",
+		},
+	},
+
+	create(context) {
+		const both = context.options[0] === "both";
+		const { blockScopedFunctions } = context.options[1];
+
+		const sourceCode = context.sourceCode;
+		const ecmaVersion = context.languageOptions.ecmaVersion;
+
+		/**
+		 * Ensure that a given node is at a program or function body's root.
+		 * @param {ASTNode} node Declaration node to check.
+		 * @returns {void}
+		 */
+		function check(node) {
+			const parent = node.parent;
+
+			if (
+				parent.type === "BlockStatement" &&
+				validBlockStatementParent.has(parent.parent.type)
+			) {
+				return;
+			}
+
+			if (validParent.has(parent.type)) {
+				return;
+			}
+
+			context.report({
+				node,
+				messageId: "moveDeclToRoot",
+				data: {
+					type:
+						node.type === "FunctionDeclaration"
+							? "function"
+							: "variable",
+					body: getAllowedBodyDescription(node),
+				},
+			});
+		}
+
+		return {
+			FunctionDeclaration(node) {
+				const isInStrictCode = sourceCode.getScope(node).upper.isStrict;
+
+				if (
+					blockScopedFunctions === "allow" &&
+					ecmaVersion >= 2015 &&
+					isInStrictCode
+				) {
+					return;
+				}
+
+				check(node);
+			},
+			VariableDeclaration(node) {
+				if (both && node.kind === "var") {
+					check(node);
+				}
+			},
+		};
+	},
+};