jest.config.js

module.exports = {
  testEnvironment: 'jsdom',
  roots: ['<rootDir>'],
  // This doens't seem to work. Removed rollup-jest from package.json since it
  // prints warnings on npm install.
  // "preset": "rollup-jest",
  transform: {
    '^.+\\.tsx?$': ['ts-jest'],
    '^.+\\.jsx?$': 'babel-jest',
  },
  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.tsx?$',
  moduleFileExtensions: ['ts', 'js'],
  moduleDirectories: ['src', 'node_modules'],
  setupFiles: ['<rootDir>/test_support/setup.ts'],
  moduleNameMapper: {
    // For jest, we want to import ts files, not js files.
    // There are a few files for which we don't want this.
    // All camel case can be remapped.
    '^(.+)/([A-Z][A-Za-z]*).js': '$1/$2.ts',
    // There are a few files that don't follow our naming scheme.
    // Maybe we should just rename them?
    './idb-keyval.js': './idb-keyval.ts',
    './base64.js': './base64.ts',
    // We need to mock out firebase, or fix the way we wrap it. This is a
    // hacky way of mocking it out. We now import firebase like a regular
    // import from npm, so this can probably be done the right way.
    // "(.*)third_party/firebasejs/5.8.2/firebase-(.*).js" :
    // "$1test_support/firebase-mock.ts"
  },
};