jest.config.ts

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

// Next documentation of testing:
// https://nextjs.org/docs/testing#setting-up-jest-with-babel=

const config: Config.InitialOptions = {
  verbose: true,
  collectCoverage: false,
  coverageProvider: 'v8',
  collectCoverageFrom: [
    '**/*.{js,jsx,ts,tsx}',
    '!**/*.d.ts',
    '!**/node_modules/**',
    '!<rootDir>/out/**',
    '!<rootDir>/.next/**',
    '!<rootDir>/tests/**',
    '!<rootDir>/*.config.{js,ts}',
    '!<rootDir>/coverage/**',
  ],
  moduleNameMapper: {
    // Handle CSS imports (with CSS modules)
    // https://jestjs.io/docs/webpack#mocking-css-modules
    '^.+\\.module\\.(css|sass|scss)$': '<rootDir>/tests/mocks/style.js',

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

    // Handle image imports
    // https://jestjs.io/docs/webpack#handling-static-assets
    '\\.(jpg|jpeg|png|gif|eot|otf|webp|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '<rootDir>/tests/mocks/file.js',

    '\\.svg$': '<rootDir>/tests/mocks/svg.js',
  },
  // Add more setup options before each test is run
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  testPathIgnorePatterns: ['<rootDir>/node_modules/', '<rootDir>/.next/'],
  testEnvironment: 'jsdom',
  transform: {
    // Use babel-jest to transpile tests, babel will use the `babel.config.js`.
    '^.+\\.(js|jsx|ts|tsx)$': 'babel-jest',
  },
  // Jest will skip `node_modules` by default, but we need to override this behavior
  transformIgnorePatterns: ['^.+\\.module\\.(css|sass|scss)$'],
};

export default config;