Support edge bundling (tracking)

[Jarred-Sumner]

What is edge bundling?

Instead of bundling & minifying in CI ahead of time, do it lazily in the HTTP request just before it's sent to the client, then cache it at the edge. "edge bundling" is a phrase I made up

Bun is fast enough to support this, but more infra needs to be built to make it good.

• Port esbuild's JavaScript minifier to bun's JavaScript parser
• Port esbuild's CSS parser to bun (including the minifier)
• Implement tree-shaking
• Implement code splitting
• Revise .bun format to support partially bundled code, or just get rid of it entirely.
• Implement sourcemaps
• Expose all this in a WASM build that can be used in environments like Cloudflare Workers

[burdiyan]

For many years I've been wondering why nobody does it this way. Finally found a proof that I wasn't crazy :)

[Jarred-Sumner]

We're probably not going to do this exactly, but we do support most of this nowadays anyway when bundling in Bun.serve()