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rest spread ignores default values #10735

eps1lon opened this issue Nov 19, 2019 · 1 comment · May be fixed by #10738

rest spread ignores default values #10735

eps1lon opened this issue Nov 19, 2019 · 1 comment · May be fixed by #10738


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@eps1lon eps1lon commented Nov 19, 2019

Bug Report

Current Behavior
Default values are ignored for rest variables.

Input Code

const props = {};
const {
  InputProps: {
  } = { foo: 1 },
} = props;


Output Code
See #10736

Expected behavior/code

logs { foo: 1 }

Can't provide a runkit since no node version supports that syntax but Chrome 78 does and it matches the expected behavior.

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

preset-env with chrome 51 as the target


  • Babel version(s): 7.7.3
  • Node/npm version: repl
  • OS: [e.g. OSX 10.13.4, Windows 10]
  • Monorepo: no
  • How you are using Babel: repl

Possible Solution

Additional context/Screenshots
Causes crashes for nested {} default values because it transpiles to props.InputProps.classe where props.InputProps can be undefined but guarded against with a default {}. Omitting that default value results in "cannot read property classes of undefined"


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@babel-bot babel-bot commented Nov 19, 2019

Hey @eps1lon! 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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