This content originally appeared on DEV Community and was authored by Gimhan Rajapaksha
Managing multiple apps and libraries can be frustrating. Luckily, Lerna makes monorepos not just possible, but actually enjoyable.
🔹 Why Use Lerna?
Let’s say you have this structure:
/root
/app1
/app2
/shared-lib
package.json
lerna.json
Your package.json might look like this:
"workspaces": {
"packages": ["app1", "app2", "shared-lib"]
}
Now, add Lerna scripts:
"scripts": {
"start": "lerna run --parallel start",
"build": "lerna run build"
}
Run npm run start → both app1 and app2 start together. 🎉
🔹 Monorepo vs Polyrepo
Monorepo: All apps + libs under one root
Polyrepo: Each app/lib in its own repo
With Lerna, the monorepo approach gets easier — single place to manage dependencies, build, and publish.
🔹 Bonus: Module Federation
Even though everything lives in one repo, with Webpack Module Federation, you can still load code at runtime across apps. Think: shared components between app1 and app2 without re-building everything.
🎯 Wrap-up
Lerna simplifies building, testing, and publishing packages in a monorepo.
Yarn Workspaces optimize dependency sharing.
Module Federation keeps things flexible at runtime.
This content originally appeared on DEV Community and was authored by Gimhan Rajapaksha
Gimhan Rajapaksha | Sciencx (2025-09-17T02:46:53+00:00) 🚀 Mastering Monorepos with Lerna + Yarn Workspaces. Retrieved from https://www.scien.cx/2025/09/17/%f0%9f%9a%80-mastering-monorepos-with-lerna-yarn-workspaces/
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