Episode 53 of The Web Development Podcast dives into a silent performance killer in modern web applications: empty async functions generated by TypeScript's `downlevelIteration` and `importHelpers` settings. Lucas and Luna trace the problem from a single misconfigured `tsconfig.json` to a 12KB bloat in a production bundle, using a real-world case from a fintech startup's dashboard. They explain why Babel and TypeScript disagree on async generator transpilation, how unused `__awaiter` helpers accumulate, and exactly which webpack analyzer tool surfaces the issue. Listeners walk away with a concrete checklist: two TypeScript compiler flags to toggle, one webpack plugin to add, and a 30-second Lighthouse audit step that catches this pattern. No abstract theory — just a fix that drops bundle size by 8 percent on a typical React app.

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