[Bug](Typescript): Duplicate declaration error happens when a imported type and function has a same name

[sapphi-red]

💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

https://babeljs.io/repl#?browsers=defaults%2C%20not%20ie%2011%2C%20not%20ie_mob%2011&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=JYWwDg9gTgLgBAbzgMQhOBfOAzKERwDkAdAPTZqEBQV2ArgHYDGMwEDKaAFAJSIZUgA&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=false&presets=typescript&prettier=false&targets=&version=7.24.4&externalPlugins=&assumptions=%7B%7D

Configuration file name

No response

Configuration

No response

Current and expected behavior

No error happens.

Environment

System:
OS: Windows 11 10.0.22631
Binaries:
Node: 20.12.0 - C:\Program Files\nodejs\node.EXE
npm: 10.5.0 - C:\Program Files\nodejs\npm.CMD
pnpm: 8.15.6 - C:\Program Files\nodejs\pnpm.CMD
npmPackages:
@babel/core: ^7.24.4 => 7.24.4
@babel/preset-env: ^7.24.4 => 7.24.4
@babel/preset-typescript: ^7.24.1 => 7.24.1

Possible solution

No response

Additional context

The error doesn't happen with esbuild.
TypeScript does not show any errors even with stricter options.

[babel-bot]

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[nicolo-ribaudo]

I think TS should error in this case, I opened microsoft/TypeScript#58131.

ESBuild also doesn't match the TS behavior, just in the direction opposite from Babel. In this code it should throw about Bar being re-declared, but it doesn't: https://esbuild.github.io/try/#YgAwLjIwLjIAAGUAZW50cnkudHMAaW1wb3J0IHsgRm9vLCBCYXIgfSBmcm9tICcuL2ZvbycKCmZ1bmN0aW9uIEZvbygpIHt9CmZ1bmN0aW9uIEJhcigpIHt9Cgpjb25zb2xlLmxvZyhCYXIpOwAAZm9vLnRzAGV4cG9ydCB0eXBlIEZvbyA9IHt9OwpleHBvcnQgY29uc3QgQmFyID0ge307

[nicolo-ribaudo]

From the TS team:

You forgot colons in your bug workbench compiler options. The behavior you’re looking for already exists: typescriptlang.org/dev/bug-workbench/?isolatedModules=true&verbatimModuleSyntax=true&ts=5.4.4#code/PTAEAEGcAsHsHcCiBbAlgFwFAggQwDby4CekAyugE6oDG6AXKFQK4Cm2Y4qks+u6rACYBZWIOb5WkRi3Y5wAN1aUARv1TJR4yWWIA7dLgAeMym0wdOAM1SS9uZK0ZXYsAHTpImVkYAOsSnQmYl9WUAAxV1AAXlAAbwBfAG5vPwCgmlg9SCCAIVxKGPjkixBrW1Z7R0ZUPUEfDy8Nf0D4iNcAGlB8woTQK0pYZFAAcjdgF1gRiytmPTpULPbYAAoASmLMWfn0Rb1ugvXNzCA

[sapphi-red]

That makes sense. I'm sorry about the wrong reproduction. Thanks for taking time 💚