Visual Studio 2017 is compiling JS file without associated TS file

[styfle]

TypeScript Version: 2.1.5

Code
Get master branch from here:
https://github.com/styfle/TypeScriptReproBug

Expected behavior:
Do not compile .js files if there is no matching .ts file.

Actual behavior:
The .js files are modified and a .js.map file is generated.

More Info

I opened an existing 2015 project in VS 2017, edited a .d.ts file, saved, and VS started compiling a lot of files....files that do not have a .ts associated with them 😨

Then I looked at git changes in Team Explorer tab and I can see that a bunch of .js files were modified and a bunch of .js.map files were added.

@billti Please review the code. Thanks!

[billti]

Thanks. I just tried this and couldn't repro, then realized I was running TypeScript 2.2. Switching to 2.1 (that comes with VS 2017) I could repro.

If you could try using TypeScript 2.2 (as outlined in #14529 (comment) ) and confirm this fixes the issue, at least we'll know this is already addressed somehow (I couldn't spot the exact commit which would have fixed it).

[styfle]

I haven't got around to testing this but is there a new version of TypeScript going to be released with a 2017 update?

[styfle]

I just realized <TypeScriptToolsVersion/> is set to 1.8.

I went ahead and tried to reproduce with the latest Visual Studio released May 10, 2017 - version 15.2 (26430.04).

Without any changes to <TypeScriptToolsVersion/> the bug is still present, however changing <TypeScriptToolsVersion/> to 2.2 fixes the bug.

[billti]

Thanks for confirming it's fixed in the latest release.

[styfle]

@billti I just had this happen to me again today. I am using Version 15.2 (26430.6) now.

[styfle]

Is this supposed to be fixed with selecting TypeScript 2.1 or only in 2.2?

[crh225]

Im on 2.3.3 and it is happening to me also