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

问题描述

我正在尝试使用async，等待Babel 6从头开始，但我没有定义regeneratorRuntime。

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 file

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可以正常工作。我有什么想法吗？

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

推荐答案

babel-polyfill 是必须的。您还必须安装它才能使异步/等待工作。

babel-polyfill 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 webpack ，则需要将其作为第一个条目根据@Cemen评论：

If you are using webpack you need to put it as the first entry as per @Cemen comment:

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

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

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

如果您想使用babel运行测试，请使用：

If you want to run tests with babel then use:

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

这篇关于未定义Babel 6 regeneratorRuntime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！