module.exports = { setupFiles: [ '/test/setup-tests.js' ], setupFilesAfterEnv: [ '/scripts/setup-test-framework.js' ], transform: { '^.+\\.js$': '/test/transform-babel-jest.js', }, /* It solves css/less/scss import issues. You might have similar issues with different file extensions (e.g. md). Just search for " jest loader" */ moduleNameMapper: { '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '/test/transform-file.js' }, };