无法运行 JEST 测试

Question

当我尝试在 jest 测试文件中使用 require() 函数导入某些内容时遇到问题。

script2.test.js

const fetch = require('node-fetch');

it('test function', () => {
  expect(4).toEqual(4);
});

Package.json

{
  "name": "jest-test",
  "version": "1.0.0",
  "description": "",
  "type": "module",
  "scripts": {
    "test": "jest --watchAll"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/cli": "^7.15.7",
    "@babel/core": "^7.15.8",
    "@babel/plugin-transform-async-to-generator": "^7.14.5",
    "@babel/preset-env": "^7.15.8",
    "jest": "^27.3.1"
  },
  "dependencies": {
    "node-fetch": "^3.0.0"
  },
  "jest": {
    "transform": {
      "^.+\.(js|jsx)$": "babel-jest"
    }
  }
}

babel.config.cjs

module.exports = {presets: ['@babel/preset-env']}

当我运行使用 npm test

进行测试时，我遇到了以下错误

FAIL  ./script2.test.js
  ● Test suite failed to run

    Jest encountered an unexpected token

    Jest failed to parse a file. This happens e.g. when your code or its dependencies use non-standard JavaScript syntax, or when Jest is not configured to support such syntax. 

    Out of the box Jest supports Babel, which will be used to transform your files into valid JS based on your Babel configuration.


    Details:
    
        C:\work\jest-udemy\node_modules\node-fetch\src\index.js:9
        import http from 'http';
        ^^^^^^
    
        SyntaxError: Cannot use import statement outside a module
    
        > 1 | const fetch = require('node-fetch');
        |                   ^

我是 JEST 的新手，非常感谢任何帮助。我的节点版本是 14.17.3 谢谢。

Answer 1

看来ESM还需要绕过圈套才行。

在 package.json 中将您的脚本更改为：

"test": "node --experimental-vm-modules node_modules/jest/bin/jest.js --watchAll"

并在 script2.test.js 中使用 import:

import fetch from 'node-fetch';

P.S。这是用节点 14.15.1

测试的

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