Babel throwing 目前未启用对实验性语法“jsx”的支持

IT技术 reactjs jestjs enzyme babeljs
2021-04-27 11:22:28

我开始写新的使用玩笑和酶react的应用程序，当尝试使用笑话一样运行测试用例的单元测试用例"test": "jest --watch"，而"test": "react-scripts test"测试通过巴贝尔去获得亚军，了解react的语法。

并且一直在使用 babel 一步一步地进行设置，但是这个错误Support for the experimental syntax 'jsx' isn't currently enabled阻止了我走得更远。正如一些线程中所建议的那样，我一直在尝试npm install --save-dev @babel/plugin-transform-react-jsx并尝试将相同的插件添加到 babel 配置中，如下面的 package.json 文件所示，但仍然没有运气。 在此处输入图片说明

这是我的 package.json

{
  "name": "multitheme-app",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@material-ui/core": "^3.9.0",
    "@material-ui/icons": "^3.0.2",
    "axios": "^0.18.0",
    "babel-plugin-transform-export-extensions": "^6.22.0",
    "jest-css-modules": "^2.1.0",
    "react": "^16.8.1",
    "react-dom": "^16.8.1",
    "react-redux": "^6.0.0",
    "react-router-dom": "^4.3.1",
    "react-scripts": "2.1.5",
    "redux": "^4.0.1",
    "redux-thunk": "^2.3.0"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": [
    ">0.2%",
    "not dead",
    "not ie <= 11",
    "not op_mini all"
  ],
  "babel": {
    "presets": [
      "@babel/preset-react",
      "@babel/preset-env",
      "@babel/preset-flow"
    ],
    "plugins": [
      "@babel/plugin-transform-modules-commonjs",
      "@babel/plugin-transform-react-jsx"
      
    ]
  },
  "devDependencies": {
    "@babel/cli": "^7.10.4",
    "@babel/core": "^7.10.4",
    "@babel/plugin-proposal-class-properties": "^7.10.4",
    "@babel/plugin-syntax-dynamic-import": "^7.8.3",
    "@babel/plugin-transform-modules-commonjs": "^7.10.4",
    "@babel/plugin-transform-react-jsx": "^7.10.4",
    "@babel/preset-env": "^7.10.4",
    "@babel/preset-es2015": "^7.0.0-beta.53",
    "@babel/preset-flow": "^7.10.4",
    "@babel/preset-react": "^7.10.4",
    "@babel/runtime": "^7.10.4",
    "babel-eslint": "^10.1.0",
    "babel-jest": "^26.1.0",
    "babel-loader": "^7.1.5",
    "babel-plugin-transform-decorators-legacy": "^1.3.5",
    "babel-preset-stage-0": "^6.24.1",
    "enzyme": "^3.11.0",
    "enzyme-adapter-react-16": "^1.15.2",
    "enzyme-to-json": "^3.5.0",
    "jest": "^23.6.0",
    "jest-cli": "^26.1.0"
  },
  "jest": {
    "verbose": true,
    "clearMocks": true,
    "collectCoverage": true,
    "setupTestFrameworkScriptFile": "<rootDir>/src/setupTest.js",
    "transform": {
      "^.+\\.js$": "babel-jest"
    },
    "moduleNameMapper": {
      "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "<rootDir>/__mocks__/fileMock.js",
      "\\.(css|scss)$": "identity-obj-proxy"
    }
  }
}

这是我的测试用例文件

import React from 'react';
import Adapter from 'enzyme-adapter-react-16';
import { shallow, configure } from 'enzyme';

import App from './App';

configure({adapter: new Adapter()});


describe('MyComponent', () => {
  it('should render correctly in "debug" mode', () => {
    const component = shallow(<App debug />);
    expect(component).toMatchSnapshot();
  });
});
4个回答

查看错误，它看起来无法加载预设以进行react。切换到配置文件并将 babel 的配置从 package.json 移动到它。一个示例文件如下所示，将位于与 package.json 相同的级别并称为 babel.config.js

module.exports = function (api) {
  const presets = [
      '@babel/preset-env',
    '@babel/preset-react',
    '@babel/preset-flow'
  ];
  const plugins = [
    '@babel/plugin-transform-runtime',
  ];

  /** this is just for minimal working purposes,
     * for testing larger applications it is
     * advisable to cache the transpiled modules in
     * node_modules/.bin/.cache/@babel/register* */
  api.cache(false);

  return {
    presets,
    plugins
  };
};

如果此问题与使用玩笑有关，

你的开玩笑配置package.json应该看起来像

typescript -

"jest": {
    ...
    
    "transform": {
       "^.+\\.(ts|tsx|js|jsx)$": "ts-jest"
    },
    
    ...
}

与 js -

"jest": {
    ...
    
    "transform": {
       "^.+\\.(js|jsx)$": "babel-jest"
    },
    
    ...
}

随着事情的不断发展，添加我当前的解决方案。
我有一个带有玩笑和测试依赖项的香草 cra

    "devDependencies": {
     "@babel/preset-env": "^7.14.9",
     "@testing-library/jest-dom": "^5.11.4",
     "@testing-library/react": "^11.1.0",
     "@testing-library/user-event": "^12.1.10",
     "jest": "^26.6.3"
  },

解决办法很简单

  • 安装 yarn add @babel/preset-react

  • 然后正确设置 babel.config.js

    module.exports = {
        presets: [
          '@babel/preset-react',
          [ 
            '@babel/preset-env',
            {
              targets: {
                node: 'current',
              },
            },
          ],
        ],
      };
  • 请注意
    ，.babelrc与预设数组相比，您对预设数组使用了不同的语法 babel.config.js

我通过去除固定这builds/其中创建文件夹通过npm run build在同一水平上的我package.json。删除后，我jest --coverage再次运行并且它起作用了。它也可以做的东西这样。

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