为响应打字稿项目设置ts-jest

Question

我正在尝试为用打字稿编写的react项目设置测试环境。我之前已经做过反应，但是使用了ES6。

以下是我的package.json相关部分的样子-

 "scripts": {
    "test": "NODE_ENV=test jest",
    "build": "webpack --mode production",
    "start": "webpack-dev-server --open --mode development"
  },
  "jest": {
    "moduleNameMapper": {
      "\\.(css)$": "jest-css-modules"
    },
    "transform": {
      "\\.(ts|tsx)$": "ts-jest"
    },
    "testRegex": ".test.(ts|tsx?)$",
    "moduleFileExensions": ["ts", "tsx", "js", "jsx", "json", "node"]
  },

我想提一提，我指望的是ts transpiler而不是完全未配置的babel。

以下是我包括的依赖项-

"dependencies": {
    "@types/jest": "^23.1.4",
    "@types/react": "^16.4.5",
    "@types/react-dom": "^16.0.6",
    "@types/react-redux": "^6.0.3",
    "@types/redux": "^3.6.0",
    "deep-freeze": "0.0.1",
    "jest": "^23.2.0",
    "jest-css-modules": "^1.1.0",
    "react-redux": "^5.0.7",
    "redux": "^4.0.0",
    "ts-jest": "^23.0.0",
    "webpack": "^4.12.2"
  },
  "devDependencies": {
    "awesome-typescript-loader": "^5.2.0",
    "css-loader": "^0.28.11",
    "html-loader": "^0.5.5",
    "html-webpack-plugin": "^3.2.0",
    "prop-types": "^15.6.2",
    "react": "^16.4.1",
    "react-dom": "^16.4.1",
    "style-loader": "^0.21.0",
    "typescript": "^2.9.2",
    "typings-for-css-modules-loader": "^1.7.0",
    "url-loader": "^1.0.1",
    "webpack-cli": "^3.0.8",
    "webpack-dev-server": "^3.1.4"
  }

我npm run test已经安装并在转换中指定了ts-jest，因此我无法理解以下错误：

Validation Error:

  Module ts-jest in the transform option was not found.
         <rootDir> is: /Users/rahul/ot/Lab/webpack-playlist

以下是tsconfig.json的样子

{
  "compilerOptions": {
    "jsx": "react",
    "noImplicitAny": true,
    "sourceMap": true,
    "target": "es5"
  }
}

不知道如何解决以上错误。

我还尝试在tsconfig.json中配置ts-jest，如下所示，但它仍然给出相同的错误-

// tsconfig.json
    "jest": {
        "globals": {
          "ts-jest": {
            "tsConfigFile": "tsconfig.jest.json"
          }
        }
      }


// tsconfig.jest.json
{
  "extends": "./tsconfig",
  "compilerOptions": {
    "module": "commonjs"
  }
}

Answer 1

查看此内容，与此处的设置没有什么不同：

https://github.com/jasonraimondi/typescript-react-starter

您的笑话配置略有不同。以下是我jest.config.js文件的内容。

module.exports = {
  "transform": {
    "^.+\\.tsx?$": "ts-jest"
  },
  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
  "moduleFileExtensions": [
    "ts",
    "tsx",
    "js",
    "jsx",
    "json",
    "node"
  ],
  "setupFiles": [
    "<rootDir>/test/setupTests.ts"
  ]
};

我有一篇关于使用ts-jest测试Typescript React App而不使用“ create-react-app”的帖子，希望会对您有所帮助。

Answer 2

这是唯一对我有用的配置。这是我的规格：

{
  "name": "project",
  "version": "1.0.0",
  "description": "project",
  "jest": {
    "modulePathIgnorePatterns": [
      "dist/"
    ],
    "snapshotSerializers": [
      "enzyme-to-json/serializer"
    ],
    "moduleNameMapper": {
      "^.+\\.(css|less|scss)$": "identity-obj-proxy"
    },
    "setupFilesAfterEnv": [
      "./setupTests.ts"
    ],
    "coverageReporters": [
      "text",
      "lcov"
    ],
    "coverageDirectory": ".",
    "transform": {
      ".(js|jsx)": "babel-jest",
      ".(ts|tsx)": "ts-jest"
    }
  },
  "peerDependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0"
  },
  "devDependencies": {
    "@types/enzyme": "^3.10.5",
    "@types/enzyme-adapter-react-16": "^1.0.6",
    "@types/jest": "^26.0.4",
    "babel-preset-env": "^1.7.0",
    "babel-preset-react": "^6.24.1",
    "enzyme-adapter-react-16": "^1.12.1",
    "ts-jest": "^26.1.0",
    "typescript": "~3.9.5"
  },
  "scripts": {
    "tsc": "tsc --build tsconfig.json",
    "watch": "tsc --watch",
    "test": "jest",
    "test-coverage": "jest --coverage"
  }
}

setupTests.ts：

{
  "name": "project",
  "version": "1.0.0",
  "description": "project",
  "jest": {
    "modulePathIgnorePatterns": [
      "dist/"
    ],
    "snapshotSerializers": [
      "enzyme-to-json/serializer"
    ],
    "moduleNameMapper": {
      "^.+\\.(css|less|scss)$": "identity-obj-proxy"
    },
    "setupFilesAfterEnv": [
      "./setupTests.ts"
    ],
    "coverageReporters": [
      "text",
      "lcov"
    ],
    "coverageDirectory": ".",
    "transform": {
      ".(js|jsx)": "babel-jest",
      ".(ts|tsx)": "ts-jest"
    }
  },
  "peerDependencies": {
    "react": "^16.12.0",
    "react-dom": "^16.12.0"
  },
  "devDependencies": {
    "@types/enzyme": "^3.10.5",
    "@types/enzyme-adapter-react-16": "^1.0.6",
    "@types/jest": "^26.0.4",
    "babel-preset-env": "^1.7.0",
    "babel-preset-react": "^6.24.1",
    "enzyme-adapter-react-16": "^1.12.1",
    "ts-jest": "^26.1.0",
    "typescript": "~3.9.5"
  },
  "scripts": {
    "tsc": "tsc --build tsconfig.json",
    "watch": "tsc --watch",
    "test": "jest",
    "test-coverage": "jest --coverage"
  }
}

最后这是我的 tsconfig.json：

{
  "compileOnSave": false,
  "compilerOptions": {
    "allowJs": true,
    "declaration": true,
    "declarationMap": true,
    "jsx": "react",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "skipLibCheck": true,
    "noImplicitAny": true,
    "target": "es5",
    "outDir": "./dist",
    "declarationDir": "./dist",
    "lib": ["es2016", "dom"]
  },
  "include": ["./src/index.ts"]
}