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Identifier has already been declared error in TSModuleBlock #10043

jj-choi opened this issue May 30, 2019 · 3 comments


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commented May 30, 2019

Bug Report

Current Behavior
SyntaxError: Identifier 'foo' has already been declared

Input Code

declare class foo {
declare module 'bar' {
  export var foo: any; // Identifier 'foo' has already been declared

Expected behavior/code
no error

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


  • Babel version(s): 7.4.5
  • Node/npm version: Node 11.13 / npm 6.7

Possible Solution
In tsParseModuleBlock(), should change its scope to SCOPE_VAR or something new.


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commented May 30, 2019

Hey @jj-choi! 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
that typically always has someone willing to help. You can sign-up here
for an invite.


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commented May 30, 2019

Is it thrown by @babel/parser or by @babel/traverse?


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commented May 31, 2019

I only used a @babel/parser.

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