git clone https://github.com/bromzh/tsyringe-npm-link-issue.git

1. Install lib dependencies and build library

cd library
npm i
npm run build

2. Link library

npm link

3. Install app dependencies and link library to app

cd ../simple-app
npm i
npm link @my/library

A symlink "@my/library" must appears in app's node_modules after this steps.

Then we'll trying to build our app:

npm run build

Build must be successful if you did all right. After build, we'll trying to run our app:

npm run start

And we got error with these reason:

TypeInfo not known for "ApiService"

BUT! If we publish our lib to repo and install it in app or just copy builded lib to app, all things will be fine.

Copy library directly in app

# work in simple_app directory
rm -rf node_modules/@my
mkdir node_modules/@my
mkdir node_modules/@my/library
cp ../library/package.json node_modules/@my/library
cp -r ../library/build node_modules/@my/library

And then repeat build and run:

npm run build
npm run start

Now all works fine!