jest.config.js

module.exports = {
  "roots": [
    "<rootDir>/src"
  ],
  "collectCoverageFrom": [
    "src/**/*.{js,jsx,ts,tsx}",
    "!src/**/*.d.ts"
  ],
  "setupFiles": [
    "react-app-polyfill/jsdom"
  ],
  "setupFilesAfterEnv": [
    "<rootDir>/src/setupTests.js",
    "./node_modules/jest-enzyme/lib/index.js"
  ],
  "testMatch": [
    "<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
    "<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
  ],
  "testEnvironment": "jsdom",
  "transform": {
    "^.+\\.(js|jsx|mjs|cjs|ts|tsx)$": "<rootDir>/config/jest/babelTransform.js",
    "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
    "^(?!.*\\.(js|jsx|mjs|cjs|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
  },
  "transformIgnorePatterns": [
    "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs|cjs|ts|tsx)$",
    "^.+\\.module\\.(css|sass|scss)$"
  ],
  "modulePaths": [],
  "moduleNameMapper": {
    // "^react-native$": "react-native-web",
    // identity-obj-proxy：第三方模块。当我们引入样式模块时，它会把原始的样式变成一个js对象，对象的key和value是一样的
    "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
  },
  "moduleFileExtensions": [
    // "web.js",
    "js",
    // "web.ts",
    "ts",
    // "web.tsx",
    "tsx",
    "json",
    // "web.jsx",
    "jsx",
    // "node"
  ],
  "watchPlugins": [
    "jest-watch-typeahead/filename",
    "jest-watch-typeahead/testname"
  ],
  "resetMocks": true
};