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Nested Typescript enums wrong transpilation. #10497

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piet-v opened this issue Sep 26, 2019 · 3 comments

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@piet-v
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commented Sep 26, 2019

Bug Report

Current Behavior
When defining an enum (NewEnum) using values from another enum (OriginalEnum) NewEnum will end up also containing all key/value pairs from OriginalEnum.

Input Code
https://babeljs.io/en/repl#?babili=false&browsers=&build=&builtIns=false&spec=false&loose=false&code_lz=KYOwrgtgBAwg8gGTgJQMpQN4CgpQOoASAkgCoCiUAvFAOQDEAZk8zQDQ5QBCCAgjANJVadAAxjxbLAF8sWUJCglgADwAuMAPYAbDQCcAzpg4AHXQEsIAQ10BPIfCRoAdIVJl2ufcADGGkABNrO2oHFFQnbj5-dikgA&debug=false&forceAllTransforms=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=true&presets=&prettier=false&targets=&version=7.6.2&externalPlugins=%40babel%2Fplugin-transform-typescript%407.6.0

Expected behavior/code
The TextColors enum should not contain a copy of Color enum

https://www.typescriptlang.org/play/?ts=3.3.3#code/KYOwrgtgBAwg8gGTgJQMpQN4CgpQOoASAkgCoCiUAvFAOQDEAZk8zQDQ5QBCCAgjANJVadAAxjxbLAF8sWUJCglgADwAuMAPYAbDQCcAzpg4AHXQEsIAQ10BPIfCRoAdIVJl2ufcADGGkABNrO2oHFFQnbj5+dikgA

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

"@babel/plugin-transform-typescript": "7.6.0"

Environment

  • Babel version(s): v7.0.0
  • How you are using Babel: REPL

Possible Solution
Use same behaviour as Typescript compiler?

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commented Sep 26, 2019

Hey @piet-v! 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."

@piet-v

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commented Sep 26, 2019

Going through the issues I noticed #7160
Not sure if this fixes the issue or not.

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