Clone and enter the repository.
git clone git@github.com:shaunluttin/typescript-publishing-type-definitions.git;
cd typescript-publishing-type-definitions;
Build my-package, on which my-app depends.
cd my-package;
npm run install;
npm run build;
Build my-app, which depends on the types in my-package.
cd .../my-app
npm run install;
npm run build;
Open my-app/index.ts to see the types working.