Breakup array iterator files

[ehmicky]

The following file:

[...array]

With the following .babelrc.js:

module.exports = {
  presets: [
    [
      '@babel/preset-env',
      { targets: { node: '9.11.2' }, useBuiltIns: 'usage', corejs: '3' },
    ],
  ],
}

Results in:

"use strict";

require("core-js/modules/es.array.iterator");

[...array];

core-js is included here but it is not necessary since the array spread operator is supported by Node 9.11.2. Note that this line is not added when targeting Node 10.0.0.

It seems to me the reason this file is included is because Array.values() was added by Node 10.0.0. However I am not using it in this case.

Using [email protected], @babel/[email protected], Ubuntu 19.10.

[zloirock]

It's how it works - we have compat data for es.array.iterator, but not for Array.prototype[@@iterator] (btw, here also some other issues). Most likely, it core-js@4 or after that, I'll split Array.prototype.{ @@iterator, keys, values, entries } to different modules and it will be solved.

[ehmicky]

Hi @zloirock, thanks for your quick answer.