reduce-bundle-size

Systematically reduce the shipped bundle size of a JS/TS library without sacrificing code readability or breaking consumer APIs. Use this skill whenever the user mentions bundle size, tree-shaking, code duplication to cut, "reduce size of", "make lighter", "shrink output", looks for wins in `dist/`, or asks to audit a library's heaviest files. Also trigger when the user pastes a `bun run build` / `npm run build` / `bunup` / `tsup` / `rollup` output showing `dist/index.js` size and asks for reductions. Prefer this over vague "refactor to be smaller" answers — it enforces a measure-first loop, concrete opportunity categories, and readability guardrails.

By kcsujeet schedule Updated 4/19/2026