I know what you mean about it being time consuming. I think I spent much more than a half a day...
But at least for my use case, a library of npm packages in Typescript, I either solved or didn't have most of the problems you mention.
Problem 1: I did have this one and your solution (not using parallel) was what I ended up with. Not sure if there's a better solution unless Lerna came up with an api that lets you scope packages in groups (with separate concurrency settings).
Problem 2: I ended up having Webpack handle Typescript and output as UMD in each of the packages. This works, but results in bigger bundles so I want try switching to using Babel.
Problem 3: didn't have this problem, probably because of Webpack. I use Jest (with ts-jest) without having to build first, in watch mode, etc. with no issues.
Problem 4: I did get Storybook working ok, but due to some unrelated issues with data I opted to roll my own demo app. I can't remember if it had the cli vs browser issue with type errors, it might have.
One issue I do have that I haven't solved is hot module replacement. I didn't put much time into it, but wasn't able to get it working with my setup. Standard reload does work at least.
Honestly, I agree it would be nice if this could all get simpler. But I'm excited that it's possible. Aside from UI libraries it's a great way to share isomorphic code, common code between React Native and a web app, etc. Not to mention the disk space savings. For me, I see it as one of those things that's a bit rough on the edges now but will hopefully improve with time.
I would take this repo for a grain of salt, as it's my first attempt at a monorepo (and some things like name choices were done pretty hastily): github.com/unleashit/npm-library
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