@pika/plugin-build-types should also support "typings" for custom type definitions

[ghengeveld]

I have a custom .d.ts file and a "typings" key in my package.json. Took me a while to figure out why plugin-build-types wasn't picking it up...

From the TypeScript docs:

Note that the "typings" field is synonymous with "types", and could be used as well.

[FredKSchott]

Yea, that's a great point that it's difficult to tell from the output what actually has been picked up and why.

I want to be a bit careful using package.json properties, since one thing that @pika/pack tries to do is handle the package.json configuration of entrypoints for you. We could use the top-level "typings" config to let you point to your own custom typings file (but then give you a new entrypoint location in your generated package). Or we could have it be a plugin option defined in your pipeline to keep that separation intact.