This is different from ones already answered at sindresorhus/ama/issues?q=typescript
Writing modules in TS from ground up gives you lot's of benefits like automatic documentation generation instead of having to manually write the API in README.md, also declaration files (*.d.ts) which yield rich experience when people use your modules.
As an example, text-store is one of my packages using TS.
sindresorhus / ama
[[I'm slow at replying these days, but I hope to get back to answering questions eventually]] Ask me anything!
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