自定义节点环境中的意外令牌导入 [英] Unexpected token import in custom node environment

问题描述

使用扩展了NodeEnvironment的自定义类时，我得到的是SyntaxError: Unexpected token import.不使用自定义测试环境时，现代的JavaScript-ES模块等可以正常工作.

I am getting a SyntaxError: Unexpected token import when using my custom class that extends NodeEnvironment. When not using a custom test environment, modern JavaScript - ES modules, etc. works fine.

我正在使用节点8.11.1和纱线1.6.0.

I'm using node 8.11.1 and yarn 1.6.0.

这是完整的错误:

$ jest --no-cache
FAIL  __tests__/math.js
  ● Test suite failed to run

    /home/user/workspace/web/jest-custom-environment-no-import/__tests__/_helpers_/environments/integration.js:1
    (function (exports, require, module, __filename, __dirname) { import NodeEnvironment from 'jest-environment-node';
                                                                  ^^^^^^

    SyntaxError: Unexpected token import

      at node_modules/jest-runner/build/run_test.js:31:29

这是我的.babelrc:

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "node": "current"
        },
        "shippedProposals": true
      }
    ]
  ]
}

还有我的package.json的jest部分:

"jest": {
  "testEnvironment": "./__tests__/_helpers_/environments/integration.js",
  "testPathIgnorePatterns": ["/node_modules/", "/_helpers_/"],
  "verbose": true
}

自定义环境:

import NodeEnvironment from 'jest-environment-node';

export default class IntegrationEnvironment extends NodeEnvironment {
  async setup() {
    await super.setup();
  }

  async teardown() {
    await super.teardown();
  }

  runScript(script) {
    return super.runScript(script);
  }
}

我还创建了一个 GitHub存储库，演示了这个问题.

I've also created a GitHub repo that demonstrates this issue.

推荐答案

我使用 esm创建了一个明智的解决方法.我创建了一个加载esm的附加文件，该文件加载了我的自定义Jest环境.

I created a sensible workaround using esm. I created an additional file that loads esm, which loads my custom Jest environment.

我的package.json现在包含:

"jest": {
  "testEnvironment": "./__tests__/_helpers_/environments/integration.index.js",
  "testPathIgnorePatterns": ["/node_modules/", "/_helpers_/"],
  "verbose": true
}

文件./__tests__/_helpers_/environments/integration.index.js包含:

// eslint-disable-next-line no-global-assign
require = require('esm')(module);

module.exports = require('./integration').default;

./__tests__/_helpers_/environments/integration.js保持不变.

在 esm分支中找到了一个工作示例是我的原始存储库.

这篇关于自定义节点环境中的意外令牌导入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！