A feature ships. Performance drops 15 points. Nobody notices until the SRE dashboard turns red at 3 a.m. Here is how to run Lighthouse in CI, define hard budgets for LCP, TBT, and bundle size, and fail every PR that makes the site slower.
Stop hand-writing fetch wrappers that drift from the spec. Here is how to generate fully typed API clients from OpenAPI specs, catch breaking changes in CI, and never debug a "but the API returned field X" production issue again.
tsc is slow, but dropping it entirely means shipping bugs that only the type checker catches. Here is a dual-pipeline approach that uses esbuild for speed and tsc for safety, with production build times cut by 80% and zero type regressions.
Every team has a handful of internal CLI tools that are fragile, undocumented, and produce output no script can parse. Here is the structured argument parsing, exit code discipline, JSON output mode, and testing pattern that turns a glue script into a tool people trust in CI and at 2 AM.