regeneratorRuntime is not defined

[afk-mario]

When I try to run the example project I get the following error:

[main.build.js?id=9121733:1]: ReferenceError: regeneratorRuntime is not defined

O fixed it installing the babel-polyfill and adding it to the main.js file

[zhouyu1993]

hello~

I first write .bablerc like this:

{
  "presets": [
    [
      "env",
      {
        "modules": false,
        "targets": {
          "browsers": [
            "> 1%",
            "last 3 versions",
            "ie >= 9",
            "ios >= 8",
            "android >= 4.2"
          ]
        },
        "useBuiltIns": "usage"
      }
    ],
    "stage-2"
  ]
}

And I don't add import 'babel-polyfill' in my entry file app.js.

It shows the error regeneratorRuntime is not defined.

So I add import 'babel-polyfill' in my entry file app.js. It works. But the file is big.

So I write .bablerc like this:

{
  "presets": [
    [
      "env",
      {
        "modules": false,
        "targets": {
          "browsers": [
            "> 1%",
            "last 3 versions",
            "ie >= 9",
            "ios >= 8",
            "android >= 4.2"
          ]
        },
        "useBuiltIns": false
      }
    ],
    "stage-2"
  ],
  "plugins": [
    "transform-runtime"
  ]
}

It don't need to add import 'babel-polyfill' in my entry file app.js. And the file is smaller.

I guess that the option useBuiltIns is something wrong.