I have a yarn workspace with two packages
PackageB depends on PackageA, so there is a symlink in the root node_modules to PackageA. When I build and run PackageB, it correctly follows PackageA/package.json#browser -> PackageA/dist/umd/index.js and executes that code.
What I would like is to sourcemap PackageA/dist/umd/index.js to the TypeScript source (PackageA/src) from which it is built.