Add components

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

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+/**
+ * @fileoverview Rule to flag use of an lexical declarations inside a case clause
+ * @author Erik Arvidsson
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('../types').Rule.RuleModule} */
+module.exports = {
+	meta: {
+		type: "suggestion",
+
+		docs: {
+			description: "Disallow lexical declarations in case clauses",
+			recommended: true,
+			url: "https://eslint.org/docs/latest/rules/no-case-declarations",
+		},
+
+		hasSuggestions: true,
+
+		schema: [],
+
+		messages: {
+			addBrackets: "Add {} brackets around the case block.",
+			unexpected: "Unexpected lexical declaration in case block.",
+		},
+	},
+
+	create(context) {
+		/**
+		 * Checks whether or not a node is a lexical declaration.
+		 * @param {ASTNode} node A direct child statement of a switch case.
+		 * @returns {boolean} Whether or not the node is a lexical declaration.
+		 */
+		function isLexicalDeclaration(node) {
+			switch (node.type) {
+				case "FunctionDeclaration":
+				case "ClassDeclaration":
+					return true;
+				case "VariableDeclaration":
+					return node.kind !== "var";
+				default:
+					return false;
+			}
+		}
+
+		return {
+			SwitchCase(node) {
+				for (let i = 0; i < node.consequent.length; i++) {
+					const statement = node.consequent[i];
+
+					if (isLexicalDeclaration(statement)) {
+						context.report({
+							node: statement,
+							messageId: "unexpected",
+							suggest: [
+								{
+									messageId: "addBrackets",
+									fix: fixer => [
+										fixer.insertTextBefore(
+											node.consequent[0],
+											"{ ",
+										),
+										fixer.insertTextAfter(
+											node.consequent.at(-1),
+											" }",
+										),
+									],
+								},
+							],
+						});
+					}
+				}
+			},
+		};
+	},
+};