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fix: pass url string to URLPattern.exec() in dynamic route matching #3901

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fix: pass url string to URLPattern.exec() in dynamic route matching #3901

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9 changes: 8 additions & 1 deletion packages/fresh/src/router.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -158,7 +158,14 @@ export class UrlPatternRouter<T> implements Router<T> {
for (let i = 0; i < this.#dynamicArr.length; i++) {
const route = this.#dynamicArr[i];

const match = route.pattern.exec(url);
// Pass `url.href` instead of the `URL` object: ~13-21x faster.
// Deno's URLPattern is a pure JS implementation. Given a `URL` object,
// `webidl.converters["URLPatternInput"]` walks and converts its
// properties on every call, and this happens *before* the internal
// match cache is consulted — so the cache never helps. A string skips
// that conversion entirely. `URL` objects cache their serialization,
// so reading `.href` here costs ~3ns.
const match = route.pattern.exec(url.href);
if (match === null) continue;

result.pattern = route.pattern.pathname;
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