Hi John,

I've used Finicky daily for years. Wanted to let you know I built a lighter sketch with the same philosophy, and to thank you for years of frictionless link routing.

The motivation was just wanting something leaner on the hot path and in memory. Finch resolves a URL in ~5μs and sits at ~17MB resident. The design is straight from Finicky: graduated match types (string, regex, or function), the opener context, the rewrite-vs-handlers split. Those are your ideas. I just rebuilt the runtime around them.

https://github.com/expelledboy/finch

Two things might be worth a look if you ever want to copy anything:

1. Marker-object helpers. domain(), from(), strip() return plain data like {__type: "domain", hosts: [...]} instead of functions. The host walks the config tree at load time and compiles markers to native NSRegularExpression and Set lookups. The hot path stays in Swift, and JS only runs for user-written (url, ctx) => ... predicates.

2. Native JavaScriptCore instead of goja. macOS ships JSC, which evaluates ES2020+ directly, so no Babel, no esbuild, no bundler. Fewer moving parts at the cost of portability.

Take whatever's useful. Feel free to share with anyone who'd find it interesting, that's part of why I'm posting here.

Thanks again.

Anthony