Configure GitHub diffs for TypeScript

[justinedelson]

GitHub doesn't seem to render diffs of TypeScript by default. See for example: 7a0c941

It seems like this can be fixed using something in .gitattributes

[ddgenome]

The git CLI shows the TypeScript diff without any gitattributes changes. We'll see what we can do.

[justinedelson]

yeah, super low priority from my perspective. I just wanted to note it

[ddgenome]

This is probably the cause: https://github.com/github/linguist/blob/master/lib/linguist/generated.rb#L318

It treats files whose paths contain node_modules/ as generated.

[ddgenome]

Or this: https://github.com/github/linguist/blob/master/lib/linguist/vendor.yml#L41

[ddgenome]

Reading the docs, it appears the vendor detection excludes the files from stats and the generated detection suppresses the diffs. Unfortunately, while there is a way to override vendor detection, there does not appear to be a way to suppress the generated detection.

We may just need to move them out from under a node_modules directory in the source and just adjust the path when they are copied under target/ as part of the build.