eslint/no-dupe-keys Correctness

✅ This rule is turned on by default.

What it does

Disallow duplicate keys in object literals

Why is this bad?

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

It is safe to disable this rule when using TypeScript because TypeScript's compiler enforces this check.

Example

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 in the CLI or using the config file, you can use:

CLI

oxlint --deny no-dupe-keys

Config (.oxlintrc.json)

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

References

• Rule Source