#no-duplicate-hooks

#Configuration

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

export default defineConfig([
  jestPlugin.configs.recommended,
  {
    rules: {
      'jest/no-duplicate-hooks': 'error',
    },
  },
]);

#Rule Details

Disallow duplicate Jest lifecycle hooks in the same scope. Each describe block (including describe.skip, describe.each, and tagged describe.each) opens a new scope; registering the same hook name twice (beforeEach, afterEach, beforeAll, or afterAll) reports the second and later calls.

• Same scope: hooks directly in a describe callback, or anywhere still inside that describe while it is active (including inside nested test / it bodies).
• Separate scopes: nested describe blocks; sibling describe blocks; file top level (hooks outside any describe share one scope).
• Allowed: one of each hook type in the same block; the same hook name again in a child or sibling describe.
• Imports: @jest/globals hooks and renamed bindings (e.g. afterEach as somethingElse) count toward the same hook name.

Examples of incorrect code for this rule:

describe('foo', () => {
  beforeEach(() => {
    // some setup
  });
  beforeEach(() => {
    // some setup
  });
  test('foo_test', () => {
    // some test
  });
});

// Nested describe scenario
describe('foo', () => {
  beforeEach(() => {
    // some setup
  });
  test('foo_test', () => {
    // some test
  });
  describe('bar', () => {
    test('bar_test', () => {
      afterAll(() => {
        // some teardown
      });
      afterAll(() => {
        // some teardown
      });
    });
  });
});

Examples of correct code for this rule:

describe('foo', () => {
  beforeEach(() => {
    // some setup
  });
  test('foo_test', () => {
    // some test
  });
});

// Nested describe scenario
describe('foo', () => {
  beforeEach(() => {
    // some setup
  });
  test('foo_test', () => {
    // some test
  });
  describe('bar', () => {
    test('bar_test', () => {
      beforeEach(() => {
        // some setup
      });
    });
  });
});

#Original Documentation

• jest/no-duplicate-hooks