perf: improvements for request handling #487
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- avoid allocating a closure & a promise if handler is not asynchronous for applyHandler() - avoid allocating a promise in handle(middleware, pathname) - Change "if (a.b == null) a.b = x" to "a.b ??= x" and similar patterns
TypeScript doesn't narrow the Handler union type based on the Symbol.toStringTag runtime check, so we need to cast the result to Promise<void> when calling .catch(). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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if (a.b == null) a.b = xtoa.b ??= xand similar patternssetImmediateusage: https://blog.platformatic.dev/the-dangers-of-setimmediate