TypeScript: Seeing Past the Hype
summary
Dropbox swaps to TypeScript in 2015 and after four years reports it scales a frontend with hundreds of engineers and millions of lines by catching API breaks and library upgrades early. Concrete tools mentioned: DefinitelyTyped for third‑party defs, an open source tool called stone for generating types from the backend, and a typings firewall to restrict lodash and trim ~25k of bundle churn. Tradeoffs: easier refactors and fewer runtime undefineds, but steep learning curve, brittle advanced types (HOCs, context) and the any escape hatch that breaks soundness.
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