Support d.ts files

[ry]

denoland/deno#3988 (comment)

cc @bartlomieju

[dsherret]

Heh, this was an oversight on my part. Should be an easy fix.

[dsherret]

@bartlomieju was there a specific scenario you found that wasn't working? I think dprint should work with .d.ts files (I added a test that uses a .d.ts extension).

That said, I found two small issues when I was looking into this and they are published in 0.5.1.

---

Forgot to add tests for this one:

global {
}

// incorrectly formatted as...
global global {
}

This one only occurred when there was a declare keyword:

declare namespace Test {
}

// incorrectly formatted as
declare module Test {
}

Again, both fixed in 0.5.1

Edit: Going to close this for now.