| /** |
| * @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 mapping = {}; |
| |
| node.cases.forEach(switchCase => { |
| const key = sourceCode.getText(switchCase.test); |
| |
| if (mapping[key]) { |
| context.report({ node: switchCase, messageId: "unexpected" }); |
| } else { |
| mapping[key] = switchCase; |
| } |
| }); |
| } |
| }; |
| } |
| }; |