False alert: dep imported in d.ts file

[conartist6]

My project contains .js files coupled with their typescript typedefs in .d.ts files. I'm running

depcheck --parsers="*.js:es6,*.d.ts:typescript"

I'd think this would work since the usages in the d.ts files are just normal es import statements. The only unusual thing about the contents of a d.ts file are that they contain the declare keyword.

[conartist6]

Ah yes, this is also because you are transpiling to sources instead of checking the typescript itself. There's a highly relevant comment here but it leaves me at a bit of a loss.

For one, the referenced issue, #163, is pretty decidedly a different problem. An @types/foo package is consumed when foo is imported or required in the transpiled code. Nothing about the current solution to parsing typescript precludes such a detector from being written.

This issue on the other hand, and #359, definitely require a different way of parsing typescript -- in particular they need to work on the actual typescript AST instead of the transpiled code.

With the advent of @babel/plugin-syntax-typescript I don't see a need to use the real typescript compiler at all. We can just run babel on the typescript sources and all the normal require/import detectors should work fine.