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Headline: Prompt caching saves money only when the cached prefix is byte-identical across requests, and a single interpolated timestamp in a system prompt is enough to make every call a cache write in
Headline: A slow tsc --noEmit is almost never caused by the number of files in a repository; it is caused by how much type instantiation the checker has to do, and --extendedDiagnostics tells you whic
Headline: An LLM feature cannot be unit-tested with string equality, because the same prompt returns different text on every call, so I assert on properties of the output instead of the output itself.
Headline: Vercel's Edge Runtime is deprecated in favor of the default Node.js runtime on Fluid Compute, and removing export const runtime = 'edge' from a Next.js route hands back full Node.js APIs wit
Headline: One 'use client' directive pulls that file's entire import graph into the browser bundle, and a barrel index.ts re-exporting two hundred modules is how that graph gets large without anyone n
Headline: One 'use client' directive pulls that file's entire import graph into the browser bundle, and a barrel index.ts re-exporting two hundred modules is how that graph gets large without anyone n
Headline: The Next.js App Router announces client-side route changes to screen readers through its built-in route announcer, but it never moves keyboard focus. Focus is left on a link that React just
Headline: A Postgres migration usually takes an app down not because the DDL is slow, but because ALTER TABLE waits for an ACCESS EXCLUSIVE lock and every query that arrives after it waits in the same
Headline: The npm attacks that actually landed over the past two years executed at install time, through lifecycle scripts, within hours of the malicious version being published. Turning dependency li
