Only add extra tooling if there is a use case about langium

[spoenemann]

Yes, I think it would make sense here.

[danieldietrich]

Just a note on shortcuts:

• npm i -D is a shortcut for npm install --save-dev
• npm i replaces the old npm i -S resp. npm install --save

[spoenemann]

I'm curious how a multi-package build looks like with npm. We used yarn + lerna for that in the past and it works really well: common external dependencies are shared and internal dependencies (between our own packages) are created as symbolic links.

[danieldietrich]

@spoenemann Hoisted (read: shared) dependencies work straight forward with Lerna + npm, no extra config needed. I used it in different projects. I can add Lerna, if you want.