oxc/bad-object-literal-comparison

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.

Configure

Off by default. To turn it on:

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

Examples

Reported:

if (items === []) {
  showPlaceholder();
}

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

Not reported:

if (items.length === 0) {
  showPlaceholder();
}

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