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Default function parameters is a inline function #10471

Wcdaren opened this issue Sep 20, 2019 · 2 comments


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commented Sep 20, 2019

var x = 1
function foo(x, y = function () { x = 2 }) {
	var x = 3
console.log(x);  // 3 1 

after bable

"use strict";

var x = 1;

function foo(x) {
  var y = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : function () {
    x = 2;
  var x = 3;

// 2 1 

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commented Sep 20, 2019

Hey @Wcdaren! 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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commented Sep 20, 2019

Related issue: #9947

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