In my tsconfig.json I use the paths option:

"compilerOptions": {
  [...]

  "paths": {
    "@*": ["./src/*"]
  },
}

Which allows me to import files as such:

import validateToken from "@auth/jwt"; // => <root>/src/auth/jwt.ts

However ncc's module resolution is incompatible with this feature, giving the following error:

ncc: Module directory "<dir>" attempted to require "@auth/jwt" but could not be resolved, assuming external.

Something like tsconfig-paths-webpack-plugin could be used to support this configuration.

I could submit a PR for this if there are no objections.