.npmignore can contain src/

[chrismcleod]

Ignoring the src folder in .npmignore reduces package size.

Someone at MS knows haha: https://github.com/Microsoft/TypeScript/blob/master/.npmignore

[lufzle]

tsconfig.json as well, for that matter :)

[Izhaki]

Depending on the build, sometimes source-maps reference the source files, and unless you publish /src these will not work.

[zackkrida]

Yeah just chiming in here, for most libs it's best-practice to ship source code to npm too. If your codebase is massive, like Microsoft/TypeScript likely is, I can see why you'd want to avoid it.