#prefer-strict-equal

#Configuration

import { defineConfig, rstestPlugin } from '@rslint/core';

export default defineConfig([
  rstestPlugin.configs.recommended,
  {
    rules: {
      'rstest/prefer-strict-equal': 'error',
    },
  },
]);

#Rule Details

Requires toStrictEqual() for structural equality assertions. Unlike toEqual(), strict equality checks that objects have the same keys and does not ignore properties whose value is undefined, preventing incomplete expected values from passing unnoticed.

The rule checks call-style toEqual() matchers on global, imported, required, namespace and import.meta.rstest APIs, as well as expect obtained from a test's TestContext. It also recognizes expect.soft(), expect.poll() and the syntactic expect.element() form. Only the first matcher in an assertion chain is checked; Chai-style matchers such as equal() and property assertions are left unchanged. Static expect APIs, locally shadowed or foreign expect functions, and matcher names computed at runtime are ignored.

#Incorrect

test('returns the complete profile', () => {
  expect(loadProfile()).toEqual({ name: 'Ada' });
});

#Correct

test('returns the complete profile', () => {
  expect(loadProfile()).toStrictEqual({ name: 'Ada' });
});

#Suggestions

Replaces the toEqual matcher accessor with toStrictEqual. Dot, string-literal and template-literal accessors keep their original syntax, and arguments, comments and the spelling of the expect root are unchanged. If an accessor cannot be rewritten safely, the rule reports it without a suggestion.