[Bug]: Error when I specify "declare class" and "function" with the same name

💻

• Would you like to work on a fix?

How are you using Babel?

@rollup/plugin-babel

Input code

REPL

declare class A {}

function A () {}

Configuration file name

.babelrc

Configuration

{
  "presets": ["@babel/preset-typescript"]
}

Current and expected behavior

I expect this construction to be compiled correctly because tsc can do it. However, currently Babel throws an error:

Duplicate declaration "A"
  1 | declare class A {}
  2 |
> 3 | function A () {}
    | 

Environment

• Babel version(s): 7.15.5
• Node: 16
• npm: 7
• OS: Windows 10
• Monorepo: no

Possible solution

No response

Additional context

No response

[JLHwung]

Good question. You can build the AST and manually assign declare to it

const decl = t.classDeclaration(...);
decl.declare = true;

[fedeci]

I can look into this