reactjs - Jest babel - 传播运算符 - Jest 遇到了意外的令牌

Question

我正在使用 Single SPA frameowrk 使用 React 创建一个微前端。

当 rub build 没有错误。但是在运行测试或覆盖时会引发以下错误。

错误详情 ：

测试套件无法运行

Jest encountered an unexpected token

This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

Here's what you can do:
 • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
 • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
 • If you need a custom transformation specify a "transform" option in your config.
 • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

You'll find more details and examples of these config options in the docs:
https://jestjs.io/docs/en/configuration.html

Details:

D:\source\projects\system-ui-components\node_modules\@babel\runtime\helpers\esm\extends.js:1
({"Object.<anonymous>":function(module,exports,require,__dirname,__filename,global,jest){export default function _extends() {
                                                                                         ^^^^^^

SyntaxError: Unexpected token 'export'

经过一些分析我的发现：

1. 问题是由于传播运算符。（如果删除有效）
2. 扩展运算符在函数中使用时起作用，但在 React 组件中不起作用。

例如：失败：<MyReactComponent {...props} /> 工作正常：const a = { id:1 , ...props }

其他信息：

使用 Babel7，babel 配置如下

  "presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@babel/preset-typescript"
  ],
  "plugins": [
    [
      "@babel/plugin-transform-runtime",
      {
        "useESModules": true,
        "regenerator": false
      }
    ]
  ],
  "env": {
    "test": {
      "presets": [
        [
          "@babel/preset-env",
          {
            "targets": "current node"
          }
        ]
      ]
    }
  }
}

任何指导都会有所帮助。

标签： reactjsjestjsbabeljsbabel-jestsingle-spa

Answer 1

我有完全相同的问题。在我的情况下，它通过添加：

babel.config.json 中“预设”数组上的“@babel/modules”

"presets": [
    "@babel/preset-env",
    "@babel/preset-react",
    "@babel/preset-typescript",
    "@babel/modules"
  ],