This shows you don't need to add a rollup/parcel/webpack config on every package inside a monorepo. It will resolve them with some configuration on the main package.

Starting instructions

First install lerna and yarn, then bootstrap and symlink the packages,

lerna bootstrap

Now let's look into individual packages.

without-rollup

is a es6 package which uses export default syntax. This is not supported normally, but let's see.

You don't need to run this directly.

with-parcel

has a short build:watch command, which executes parcel. Usually it's for the browser.

Run like below from the root folder,

lerna run build:watch --stream

with-rollup

has a rollup.config.js file, it uses run, commonjs and node-resolve plugin for rollup. The run is just to run it on the console.

lerna run build:watch --stream

Note: this will also run the parcel from with-parcel since that has same start script/command. It won't run anything from the without-rollup folder because that folder does not have this command on package.json.

with-rollup-parcel

uses both above in two different commands.

# one terminal
lerna run build:watch:rollup --stream

# another
lerna run build:watch:parcel --stream

with-webpack

is basically same as the rollup config, we provide it with required babel configuration etc and it will import as needed. For example's sake, I have put a dev server on webpack. It will create a dev index.html by itself.

lerna run build:watch:webpack --stream