https://github.com/avindra/babel-ts-export-type-bug

repro of type erase problem in babel's typescript support
https://github.com/avindra/babel-ts-export-type-bug

babel bug-reproduction typescript

Last synced: 2 months ago
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repro of type erase problem in babel's typescript support

• Host: GitHub
• URL: https://github.com/avindra/babel-ts-export-type-bug
• Owner: avindra
• Created: 2020-12-31T19:06:15.000Z (over 5 years ago)
• Default Branch: src
• Last Pushed: 2020-12-31T19:27:41.000Z (over 5 years ago)
• Last Synced: 2025-10-28T23:38:30.604Z (8 months ago)
• Topics: babel, bug-reproduction, typescript
• Language: JavaScript
• Homepage:
• Size: 1.95 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
This repo contains the minimum needed to demonstrate the type erasure bug seen in Babel's typescript mode.

## Issues

It was seen in [Recharts Issue #2360](https://github.com/recharts/recharts/issues/2360).

 * [Babel #12578](https://github.com/babel/babel/issues/12578)

 * [Babel #11464](https://github.com/babel/babel/issues/11464)

## Reproduce

Check the checked-in `es6` folder to see what babel is currently emitting, or run `npm run build` / `yarn build` locally.

Expected:

`SomeType` is erased from `es6/index.js`

Actual:

`SomeType` is still referenced in `es6/index.js`

This is a problem for all the JavaScript (non-Typescript) consumers since the type does not exist in the build. 

If we check `es6/ModuleA.js`, we can see `SomeType` is erased, so it's at least partly working.