Demo of Yarn 1 vs. 2 node_modules installs

This repo has the same project twice, once installed with Yarn 1 and once with Yarn 2 + the node-modules linker.

It was created to demonstrate a possible performance issue with v2 install times, see PR #1, but later, it was found out that the repo setup was flawed and the install times were fixed, see #2.

How to try

Install packages-v1:

# Initial, slow installation with a cold cache
cd packages-v1
yarn

# Remove node_modules recursively
find . -name 'node_modules' -type d -prune -exec rm -rf '{}' +

# Install again with warm cache
yarn

Then do the same in packages-v2.

The times I'm seeing are:

• packages-v1: ~60 seconds
• packages-v2: ~40 seconds

Next.js build

To test build after installing node_modules, you can run:

yarn build-everything