Babel 6 regeneratorRuntime 未定义 [英] Babel 6 regeneratorRuntime is not defined

问题描述

我正在尝试在 Babel 6 上从头开始使用 async/await，但我发现 regeneratorRuntime 未定义.

I'm trying to use async/await from scratch on Babel 6, but I'm getting regeneratorRuntime is not defined.

.babelrc 文件

.babelrc file

{
    "presets": [ "es2015", "stage-0" ]
}

package.json 文件

package.json file

"devDependencies": {
    "babel-core": "^6.0.20",
    "babel-preset-es2015": "^6.0.15",
    "babel-preset-stage-0": "^6.0.15"
}

.js 文件

"use strict";
async function foo() {
  await bar();
}
function bar() { }
exports.default = foo;

在没有 async/await 的情况下正常使用它效果很好.知道我做错了什么吗?

Using it normally without the async/await works just fine. Any ideas what I'm doing wrong?

推荐答案

babel-polyfill (已弃用 Babel 7.4) 是必需的.您还必须安装它才能使 async/await 正常工作.

babel-polyfill (deprecated as of Babel 7.4) is required. You must also install it in order to get async/await working.

npm i -D babel-core babel-polyfill babel-preset-es2015 babel-preset-stage-0 babel-loader

package.json

package.json

"devDependencies": {
  "babel-core": "^6.0.20",
  "babel-polyfill": "^6.0.16",
  "babel-preset-es2015": "^6.0.15",
  "babel-preset-stage-0": "^6.0.15"
}

.babelrc

{
  "presets": [ "es2015", "stage-0" ]
}

.js with async/await(示例代码)

.js with async/await (sample code)

"use strict";

export default async function foo() {
  var s = await bar();
  console.log(s);
}

function bar() {
  return "bar";
}

在启动文件中

require("babel-core/register");
require("babel-polyfill");

如果您使用的是 webpack，您需要将它作为 entry 数组的第一个值放在您的 webpack 配置文件(通常是 webpack.config.js)，根据@Cemen 评论:

If you are using webpack you need to put it as the first value of your entry array in your webpack configuration file (usually webpack.config.js), as per @Cemen comment:

module.exports = {
  entry: ['babel-polyfill', './test.js'],

  output: {
    filename: 'bundle.js'       
  },

  module: {
    loaders: [
      { test: /.jsx?$/, loader: 'babel', }
    ]
  }
};

如果你想用 babel 运行测试，那么使用:

If you want to run tests with babel then use:

mocha --compilers js:babel-core/register --require babel-polyfill

这篇关于Babel 6 regeneratorRuntime 未定义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！