// Base tsconfig at /Users/a_user/a_repo/core.json
{
  "compilerOptions": {
    "forceConsistentCasingInFileNames": true,
    "baseUrl": "",
    "paths": {
      "*": [ "*", "src/*" ]
    }
  }
}

// tsconfig at /Users/a_user/a_repo/tsconfig.json
{
  "extends": "./core"
}

// Source file in /Users/a_user/a_repo/src/foo.ts
const v = 1;
export default v;

// Source file in /Users/a_user/a_repo/src/bar.ts
import v from "foo";