oxc/bad-object-literal-comparison Correctness

✅ This rule is turned on by default.

Checks for comparisons between object and array literals.

Comparing a variable to an object or array literal will always return false as object and array literals are never equal to each other.

If you want to check if an object or array is empty, use Object.entries() or Object.keys() and their lengths.

Examples of incorrect code for this rule:

javascript

if (x === {}) {
}
if (arr !== []) {
}

Examples of correct code for this rule:

javascript

if (typeof x === "object" && Object.keys(x).length === 0) {
}
if (Array.isArray(x) && x.length === 0) {
}

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": {
    "oxc/bad-object-literal-comparison": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "oxc/bad-object-literal-comparison": "error",
  },
});

bash

oxlint --deny oxc/bad-object-literal-comparison

This rule was added in v0.1.1.