jest.config.ts

import type { Config } from '@jest/types'

const config: Config.InitialOptions = {
  verbose: true,
  collectCoverageFrom: ['**/*.{ts,tsx}', '!**/*.d.ts', '!**/node_modules/**'],
  coveragePathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/'],
  moduleNameMapper: {
    /* Handle CSS imports (with CSS modules)
    https://jestjs.io/docs/webpack#mocking-css-modules */
    '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',

    // Handle CSS imports (without CSS modules)
    '^.+\\.(css|sass|scss)$': '<rootDir>/__mocks__/styleMock.js',

    /* Handle image imports
    https://jestjs.io/docs/webpack#handling-static-assets */
    '^.+\\.(jpg|jpeg|png|gif|webp|svg)$': '<rootDir>/__mocks__/fileMock.js',
  },
  testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/', '<rootDir>/src/pages/api/test.ts'],
  testEnvironment: '<rootDir>/test/unit/custom-test-env.ts',
  transform: {
    /* Use babel-jest to transpile tests with the next/babel preset
    https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object */
    '^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel'] }],
  },
  transformIgnorePatterns: ['/node_modules/', '^.+\\.module\\.(css|sass|scss)$'],
}

export default config