jest.config.js

module.exports = {
  // All js files need to be transformed using jest-preprocess.js i.e. babel
  transform: {
    '^.+\\.js$': '<rootDir>/jest-preprocess.js',
  },
  // Mock static file imports
  moduleNameMapper: {
    '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
    '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '<rootDir>/__mocks__/file-mock.js',
  },
  // Ignore the following directories
  testPathIgnorePatterns: ['node_modules', '.cache', 'public'],
  // Jest comes with JSDOM@11 by default, use JSDOM@15 instead.
  // It is needed for HTML Canvas support that is used in some of our imported node modules.
  testEnvironment: 'jest-environment-jsdom-fifteen',
  // Gatsby includes un-transpiled ES6 code and Jest doesn't transpile code inside node_modules
  transformIgnorePatterns: ['node_modules/(?!(gatsby)/)'],
  // The following file gets run automatically before every test.
  // It imports jest-dom so we don't have to import it on every single test file.
  setupFilesAfterEnv: ['<rootDir>/setup-test-env.js'],
};