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-dupe-keys.md.
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Rslint

    no-dupe-keys

    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-dupe-keys': 'error',
    },
  },
]);

    Rule Details

    Disallow duplicate keys in object literals. Multiple properties with the same key in object literals can cause unexpected behavior.

    Examples of incorrect code for this rule:

    var foo = {
  bar: 'baz',
  bar: 'qux',
};

var foo = {
  bar: 'baz',
  bar: 'qux',
};

    Examples of correct code for this rule:

    var foo = {
  bar: 'baz',
  qux: 'quux',
};

// getter and setter with same name is valid
var foo = {
  get bar() {},
  set bar(v) {},
};

    Original Documentation