Since version 1.7.0 plugin has been integrated into core. You no need to install plugin separately.
yarn add parcel-plugin-pug
npm install parcel-plugin-pug
If you getting error like that
parcel src/content.pug ⏳ Building... Server running at http://localhost:1234 🚨 Cannot find module 'parcel-bundler/src/Asset'
you need to install
parcel-bundler by running
npm install -D parcel-bundler or
yarn add parcel-bundler in your project folder, because plugin uses
parcel-bundler as peerDependency.