Javascript error which isn't one: 'type arguments' can only be used in a .ts file

[masbaehr]

• VSCode Version: 1.31-insider
• OS Version: Windows 10 Pro

[octref]

Please include reproducible steps.

[masbaehr]

Just put this file into the editor and open it:

https://github.com/schmich/instascan/releases/download/1.0.0/instascan.min.js

Usually other minified js files open normally and syntax highlighting still works, but not this one. I can't exclude this is an error in the file but even then the error message is probably wrong.

[mjbvz]

confirmed using typescript@3.3.0-dev.20190101

The pattern that causes issues is:

if((0)<0>(0)){ }

[fatcerberus]

Hmm, it appears to think the stuff inside <> is a type argument, in this case it’s <(n|0)|(e|0)> which I guess the compiler thinks is a type union...

My instinct is that the error message should probably be removed entirely and the compiler just treat it as a normal < or > operator when inside a .js file.

[DanielRosenwasser]

Basic idea is that when the file is a JS/JSX file, don't try to parse type arguments for

• call expressions
• new expressions
• tagged template strings
• JSX
• decorators (I don't even think we currently do at all)