webpack setup .babelrc.js probably used useBuiltIns wrongly

[3cp]

Current webpack .babelrc.js set userBuiltIns to true

module.exports = () => {
  return {
    // ...
    "presets": [
      [
        "env", {
          // ...
          "useBuiltIns": true
        }
      ]
    ]
  }
}

But preset-env's useBuitIns only has three options: "usage", "entry", or false.

babel/babel#6830
https://babeljs.io/docs/en/next/babel-preset-env.html#usebuiltins

I suspect the current "useBuiltIns": true has same effect as "useBuiltIns": false.