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- "use strict";
- const astUtils = require("./utils/ast-utils");
- 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;
-
- 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);
- }
- }
- }
- }
- };
- }
- };
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