Generic function causes parsing error

[mariusschulz]

What version of TypeScript are you using?
2.6.2

What version of typescript-eslint-parser are you using?
11.0.0

What code were you trying to parse?

index.ts within a TypeScript project with JSX enabled:

const id = <T>(x: T) => x;

What did you expect to happen?
No parsing error.

What happened?
A parsing error:

Parsing error: JSX element 'T' has no corresponding closing tag

[mightyiam]

Can't use the <T> syntax of type assertion with JSX, I think.

[mariusschulz]

You're right, you can't use <T> for type assertions within .tsx files. However, in my example, I'm not using a type assertion and I'm also not within a .tsx file — I'm just declaring a type parameter to make the function generic. TypeScript happily compiles the code.

[JamesHenry]

Thanks, @mariusschulz!

The issue is not limited to type assertions, it applies to any ambiguous constructs. This is one such construct. TypeScript cannot compile this with jsx enabled, which as you said is the case here.

This, therefore, comes under #399, so I am going to close this.