Error: TS2393: Duplicate function implementation.

[bluelovers]

TypeScript Version: 3.2.0-dev.201xxxxx

Search Terms: Duplicate function implementation.

Code

// => Error: TS2393: Duplicate function implementation.
function f()
{
	if (true)
	{
		throw new Error();
	}
}
console.log(1);
f();
console.log(2);

---

i know in #24925 (comment)

it say can add export {};

but with follow code, work as Expected => ReferenceError: f is not defined

so there is no f in global

console.log(1);
f();
console.log(2);

Expected behavior:

should not have error

Actual behavior:

Error: TS2393: Duplicate function implementation.

Playground Link:

Related Issues:

[weswigham]

what other code is in your compilation? This doesn't happen in the playground, so something important is missing from your description.

[bluelovers]

@weswigham

2 file all have f

video https://www.youtube.com/watch?v=rj8wdubGmf8&feature=youtu.be

ts\index.d.ts
ts\index.js
ts\index.ts

uglify\index.d.ts
uglify\index.js
uglify\index.ts

[weswigham]

Oh. Well, yeah. Both of those files are interpreted as being globally scoped, so we see two definitions of f in the global scope, which isn't good.

[bluelovers]

but they didn't use together

i think should not check this

i don't understand why need check this
there has something will have bug by this?

[Ln2be]

Yes This must be a bug why all the files in the same folder are globally scopes