For AI agents: the complete documentation index is available at https://rslint.rs/llms.txt, the full documentation bundle is available at https://rslint.rs/llms-full.txt, and this page is available as Markdown at https://rslint.rs/rules/eslint/no-duplicate-case.md.
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Rslint

    no-duplicate-case

    Added in v0.2.2

    Configuration

    PresetConfigured Value
    ✅ js.configs.recommended"error"
    rslint.config.ts
    import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-duplicate-case': 'error',
    },
  },
]);

    Rule Details

    Disallow duplicate case labels in switch statements. Duplicate case labels indicate a probable mistake.

    Examples of incorrect code for this rule:

    switch (a) {
  case 1:
    break;
  case 1:
    break;
}

switch (a) {
  case 'a':
    break;
  case 'a':
    break;
}

    Examples of correct code for this rule:

    switch (a) {
  case 1:
    break;
  case 2:
    break;
}

switch (a) {
  case 'a':
    break;
  case 'b':
    break;
}

    Original Documentation