Lately, I've been doing a lot of migration from single repositories to Monorepos. Here are three very handy tools to make these setups debugging easier.
1 - Yarn why / npm ls
If you're using Yarn, this is really useful for checking why a certain dependency is inside your codebase, how it got there and which packages are depending on it.
yarn why react
Official docs on Yarn why here.
If you're not a Yarn user, you can also use the following command:
Run this itself to get to know about dependency errors inside your project (marked with red).
Or you can also check how many times a package got involved in your project by just giving the package name as a parameter
npm ls react
Be brave about resolving your dependency hells! 🍀
2 - Tame your TypeScript configs
So let's say we have something like this for the structure for your monorepo:
├─ apps/ │ ├─ frontend/ │ ├─ backend/ ├─ packages/ │ ├─ tsconfig/ │ ├─ config/
It could happen that there is a
tsconfig.json in your
apps/frontend and also
apps/backend folders and they're extending a base config from
Also there could be more complex cases, so if you're curious at the end of the day how your final
tsconfig.json will look like for a specific project you can do:
tsc -p apps/frontend --showConfig
This is going to print out the whole merged typescript config what the project will use.
Original idea from here, big shout out to Marius. 🎉
I also advise to record this into your root
"tsconfig:debug:frontend": "tsc -p apps/frontend --showConfig"
to give your team a nifty debug script that they can rely on.
3 - Ace your eslint configs
In my experience eslint configurations can blow up really quickly, especially when you're trying to make sense and merge from two different projects.
🤔 Not sure which plugins/rules are actually being used when you run eslint?
Try this for one of your files:
npx eslint --print-config apps/frontend/what/ever/your/file.ts
This will print out all the rules and plugins being used so you can grasp what's happening under the hood.
That's it for today, I wish you Happy debugging! 🤘
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