無法運行 JEST 測試

Question

當我嘗試在 jest 測試文件中使用 require() 函數導入某些內容時遇到問題。

腳本2.test.js

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

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

包.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']}

使用 npm test 運行測試時出現以下錯誤

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，非常感謝任何幫助。 我的 Node 版本是 14.17.3 謝謝。

Answer 1

似乎仍然需要跳槽才能與 ESM 開玩笑。

在package.json 中，將您的腳本更改為：

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

在script2.test.js 中使用import ：

import fetch from 'node-fetch';

PS 這是用節點 14.15.1 測試的