eslint/no-dupe-keys Correctness

✅ This rule is turned on by default.

Disallow duplicate keys in object literals.

This rule can be disabled for TypeScript code, as the TypeScript compiler enforces this check.

Multiple properties with the same key in object literals can cause unexpected behavior in your application.

Examples of incorrect code for this rule:

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

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

var foo = {
  0x1: "baz",
  1: "qux",
};

Examples of correct code for this rule:

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

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)Config (oxlint.config.ts)CLI

json

{
  "rules": {
    "no-dupe-keys": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "no-dupe-keys": "error",
  },
});

bash

oxlint --deny no-dupe-keys

This rule was added in v0.0.3.