ts-link

Reproduction case for TypeScript issue #6496

Description

This repository contains two modules, mod-a and mod-b. Use yarn to install the dependencies of both modules. If you open mod-a/package.json, you will notice that module A depends on module B through a link.

1. Compile mod-b with yarn build
2. Compile mod-a with yarn build

Compiling mod-a will fail with the following error

src/index.ts(7,15): error TS2345: Argument of type 'UnaryFunction<Observable<string>, Observable<string>>' is not assignable to parameter of type 'UnaryFunction<Observable<string>, Observable<string>>'.
  Types of parameters 'source' and 'source' are incompatible.
    Type 'Observable<string>' is not assignable to type 'Observable<string>'. Two different types with this name exist, but they are unrelated.
      Property 'buffer' is missing in type 'Observable<string>'.
src/index.ts(7,47): error TS7006: Parameter 'result' implicitly has an 'any' type.