Right now if you write tsc --help, you'll get

Version 2.x.x-dev.123456
Syntax:   tsc [options] [file ...]

Examples: tsc hello.ts
          tsc --outFile file.js file.ts
          tsc @args.txt

Notice that last part: tsc @args.txt.

Response files are not something we've thought about in forever. tsconfig.json has been the standard way to use TypeScript for quite a bit now. The example given is confusing at this point.

I think we should either remove it entirely or use tsc --project tsconfig.json