#prefer-equality-matcher

#Configuration

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

export default defineConfig([
  jestPlugin.configs.recommended,
  {
    rules: {
      'jest/prefer-equality-matcher': 'error',
    },
  },
]);

#Rule Details

Suggest using the built-in equality matchers.

Jest has built-in matchers for expecting equality, which allow for more readable tests and error messages if an expectation fails.

This rule checks for strict equality checks (=== and !==) in tests that could be replaced with one of the following built-in equality matchers:

• toBe
• toEqual
• toStrictEqual

Fixes are provided as editor suggestions (one suggestion per matcher above).

Loose equality (== / !=) is not reported.

Examples of incorrect code for this rule:

expect(x === 5).toBe(true);
expect(name === 'Carl').not.toEqual(true);
expect(myObj !== thatObj).toStrictEqual(true);

Examples of correct code for this rule:

expect(x).toBe(5);
expect(name).not.toEqual('Carl');
expect(myObj).not.toStrictEqual(thatObj);

#Original Documentation

• jest/prefer-equality-matcher