jest.config.cjs

module.exports = {
    preset: 'ts-jest',
    testEnvironment: 'jsdom',
    // what about: ts-node CLI option:
    // --prefer-ts-exts Re-order file extensions so that TypeScript imports are preferred (TS_NODE_PREFER_TS_EXTS, default: false)
    moduleNameMapper: {
        '^(\\..*)$': ['$1/index.ts', '$1.ts', '$1'],
    },
    testMatch: ['<rootDir>/test.ts?(x)', '<rootDir>/test/**.ts?(x)'],

    // https://jestjs.io/docs/configuration#restoremocks-boolean
    restoreMocks: true,
}