Function with destructuring assignment breaks react dev build

[untitledlt]

Reposting this from Babel issues as Babel team says it's acornjs related.

Bug Report

Tested on clean create-react-app install.
This function in any component file breaks React app:

const myFn = ({ set = '' }) => {};

Current behavior

./src/App.js 7:6
Module parse failed: Unexpected token (7:6)
File was processed with these loaders:
 * ./node_modules/babel-loader/lib/index.js
 * ./node_modules/eslint-loader/dist/cjs.js
You may need an additional loader to handle the result of these loaders.
| 
| const myFn = ({
>   set = ''
| }) => {};
|

if I change set to anything else, everything works fine.

Input Code

const myFn = ({ set = '' }) => {};

Expected behavior
Should transpile without errors.

Babel Configuration (babel.config.js, .babelrc, package.json#babel, cli command, .eslintrc)
Clean, not ejected create-react-app.

Environment

- Babel version(s): [7.9.0]
- Node/npm version: [12.14.0]
- OS: [macOS 10.15.4]
- Monorepo: [no]
- How you are using Babel: [`loader`]

Possible Solution
Do not use set as object property

[untitledlt]

@marijnh why is it closed?

[RReverser]

@untitledlt As you can see above, it was closed by a commit that fixes this issue.

[untitledlt]

oh sorry, missed that. Thanks!

[RReverser]

Thanks for the detailed report!