Consider adding --watch to the cli

[Earlopain]

esbuild has --watch sass has --watch tsc has --watch

Usage is for development so that changes are immediatly reflected. I saw #126 which recommends an external tool like watchexec but that's something extra to install and other tooling has this functionality out of the box.

[trymeouteh]

Please add an watch/live reload feature in Lightning CSS which can work like this

lightningcss --watch bundle.css -o dist/style.css

When it runs, it will listen for changes being made and update these changes to the build file (In this case, dist/style,css).

Will be useful when using lightning for development.

[splashsky]

+1 for this idea. Would make iterating a joy!