# oxc/bad-object-literal-comparison

> Disallow comparing a value with `{}` or `[]`

`items === []` doesn't test whether `items` is empty. Each `[]` or `{}` creates a new object, and `===` compares objects by identity, so the comparison is always `false` and `!==` is always `true`.

The rule reports `==`, `!=`, `===` and `!==` with an empty object or array literal on either side. To test whether something is empty, look at `length` or at the keys.

{/* Generated by src/codegen/lint-rule-docs.ts. Do not edit this section. */}

## Configure

Off by default. To turn it on:

```toml bunfig.toml
[lint.rules]
"oxc/bad-object-literal-comparison" = "error" # or "warn"
```

{/* End of the generated section. */}

## Examples

Reported:

{/* bad {"count": 2} */}
```js
if (items === []) {
  showPlaceholder();
}

if (filters !== {}) {
  applyFilters(filters);
}
```

Not reported:

{/* good */}
```js
if (items.length === 0) {
  showPlaceholder();
}

if (Object.keys(filters).length > 0) {
  applyFilters(filters);
}
```