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| /** | |
| * @fileoverview Rule to disallow a duplicate case label. | |
| * @author Dieter Oberkofler | |
| * @author Burak Yigit Kaya | |
| */ | |
| "use strict"; | |
| //------------------------------------------------------------------------------ | |
| // Rule Definition | |
| //------------------------------------------------------------------------------ | |
| module.exports = { | |
| meta: { | |
| type: "problem", | |
| docs: { | |
| description: "disallow duplicate case labels", | |
| category: "Possible Errors", | |
| recommended: true, | |
| url: "https://eslint.org/docs/rules/no-duplicate-case" | |
| }, | |
| schema: [], | |
| messages: { | |
| unexpected: "Duplicate case label." | |
| } | |
| }, | |
| create(context) { | |
| const sourceCode = context.getSourceCode(); | |
| return { | |
| SwitchStatement(node) { | |
| const previousKeys = new Set(); | |
| for (const switchCase of node.cases) { | |
| if (switchCase.test) { | |
| const key = sourceCode.getText(switchCase.test); | |
| if (previousKeys.has(key)) { | |
| context.report({ node: switchCase, messageId: "unexpected" }); | |
| } else { | |
| previousKeys.add(key); | |
| } | |
| } | |
| } | |
| } | |
| }; | |
| } | |
| }; |