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Array spread doesn't work correctly. #10586

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rev-hikari opened this issue Oct 22, 2019 · 1 comment

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@rev-hikari
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@rev-hikari rev-hikari commented Oct 22, 2019

Bug Report

Input Code

REPL

const arr1 = [...Array(2)]
const arr2 = Array(2);
const arr3 = [...arr2];

Current Behavior

var arr1 = _toConsumableArray(Array(2)); // [undefined, undefined]
var arr2 = Array(2); // [empty × 2]
var arr3 = [].concat(arr2); // [empty × 2]

Expected behavior/code

var arr1 = _toConsumableArray(Array(2)); // [undefined, undefined]
var arr2 = Array(2); // [empty × 2]
var arr3 = _toConsumableArray(arr2); // [undefined, undefined]

Babel Configuration (.babelrc, package.json, cli command)

{
  "presets": ["@babel/preset-env"]
}

Environment

  • Babel version(s): v7.6.4
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@babel-bot babel-bot commented Oct 22, 2019

Hey @rev-hikari! We really appreciate you taking the time to report an issue. The collaborators on this project attempt to help as many people as possible, but we're a limited number of volunteers, so it's possible this won't be addressed swiftly.

If you need any help, or just have general Babel or JavaScript questions, we have a vibrant Slack community that typically always has someone willing to help. You can sign-up here for an invite."

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