Steps to extract the inputs to the SWC minifier.

Step 1. Clone the SWC repository

You would need to clone the SWC repository to your local machine, and invoke a script in the repository from the project root of your next.js app. So in this example, we will assume that the link above is cloned to ~/projects/swc.

git clone https://github.com/swc-project/swc.git ~/projects/swc

Step 2. Do everything except the next build step.

This depends on your project. You should install all the dependencies, run the dependency tasks for your next.js app, like the ones invoked automatically by monorepo management tools like turbo.

Step 3. Invoke the script

~/projects/swc/crates/swc_ecma_minifier/scripts/next/add-test.sh

This will run the next build step, and it will copy all inputs to the SWC minifier into test directory of your SWC clone. You can move those files to your minifier inputs directory.

The lead maintainer (@kdy1) maintains a repository for the minifier inputs at https://github.com/kdy1/swc-minifier-inputs (opens in a new tab) to profile the performance of the minifier.