TypeScript ignores "tsconfig.json" of linked dependency whose main module has ".ts" extension

[aleclarson]

TypeScript Version: 3.6.0-dev.20190615

Search Terms:
symlink yarn link dependency main tsconfig tsconfig.json

Code: https://github.com/aleclarson/repro/tree/tsc-1

Note: That repro is not my real use case, but it succinctly demonstrates the problem. My real use case involves the linked dependency using compilerOptions.paths to resolve a sub-dependency.

Expected behavior:
The dependency's tsconfig.json should be used, because the main module has a .ts extension.

Actual behavior:
The parent's tsconfig.json is used instead, resulting in a compiler error.

Related Issues: None