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/** * @fileoverview Rule to disallow a duplicate case label. * @author Dieter Oberkofler * @author Burak Yigit Kaya */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "problem", docs: { description: "Disallow duplicate case labels", recommended: true, url: "https://eslint.org/docs/latest/rules/no-duplicate-case" }, schema: [], messages: { unexpected: "Duplicate case label." } }, create(context) { const sourceCode = context.sourceCode; /** * Determines whether the two given nodes are considered to be equal. * @param {ASTNode} a First node. * @param {ASTNode} b Second node. * @returns {boolean} `true` if the nodes are considered to be equal. */ function equal(a, b) { if (a.type !== b.type) { return false; } return astUtils.equalTokens(a, b, sourceCode); } return { SwitchStatement(node) { const previousTests = []; for (const switchCase of node.cases) { if (switchCase.test) { const test = switchCase.test; if (previousTests.some(previousTest => equal(previousTest, test))) { context.report({ node: switchCase, messageId: "unexpected" }); } else { previousTests.push(test); } } } } }; } };