Make invalid files in tsconfig.json super obvious when ts-loader errors

[johnnyreilly]

Hey @jbrantly

This PR is to mitigate the problems of #117 - invalid files in tsconfig.json will be very obvious as a result of the change to error message. Hope you like it; happy to tweak further. I've added a test as well.

[jbrantly]

Beautiful! Thanks for this. The test is currently failing on TS 1.8 (cause of the changes in TS 1.8 to add "use strict" to output). As a quick note, you can could either update manually or....

npm install typescript@next
npm test -- --save-output

That will update the test cases with the actual output. Then you just need to review the output using git diff and you're good to go.

As far as actual functionality, 👍

[johnnyreilly]

Thanks chap - I submitted the PR and then turned off my computer (foolishly assuming the build would pass 😄). I'll fix and commit when I get a moment.

[jbrantly]

Thanks again!

[johnnyreilly]

My pleasure!

[jkillian]

👍 Great change! This was throwing me for a loop today