Allow (js/ts) file extensions to be ignored

[xiaoxiangmoe]

import { identity } from './identity.util.ts' works.
import { identity } from './identity.util' will return 404.

[yyx990803]

This is because you have a dot in the file name...

[xiaoxiangmoe]

It's common usage from Angular. Also some user use it in React.
For example: foo.service, bar.component