Transpilation differences between parcel .. and parcel build

[achingbrain]

🐛 bug report

I have CJS dependencies that destructure required modules:

const { foo: bar } = require('some-dep')

// use `bar`

These work as expected when using the dev server started by parcel ./path/to/index.html but if I run the js created by parcel build ./path/to/index.html it fails in the browser with errors similar to bar is not defined.

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

No config, only the defaults.

🤔 Expected Behavior

The code should be the same when created by the dev server or the bundle command.

😯 Current Behavior

See above.

💁 Possible Solution

🤷‍♂️

🔦 Context

Trying to build an app

💻 Code Sample

See above.

🌍 Your Environment

Software	Version(s)
Parcel	2.0.0-beta.2
Node	15.11.0
npm/Yarn	npm 7.6.0
Operating System	Mac OS X

[achingbrain]

This seems to be related to scope hoisting - if I pass the --no-scope-hoist flag it works as expected.

[ghost]

--no-scope-hoist

I was getting the error TypeError: Object.defineProperty called on non-object. Adding --no-scope-hoist fixed that for me also.