TypeScript is a typed superset of JavaScript that compiles down to regular JavaScript. Jon Turner maintains the TypeScript package at Microsoft.

• Why is TypeScript useful?
• Does compile-time checking add any real efficiency?
• The current TypeScript compiler is written in TypeScript–how did you compile that compiler?
• TypeScript was created to build large, manageable JavaScript applications–how did Microsoft due that before TypeScript?
• What language design preferences does Anders Hejlsberg have which are evident in TypeScript?
• Google’s Angular 2.0 project used TypeScript–is this part of a broader story of collaboration among tech giants?

Links:

• Developer Ergonomics
• Bret Victor, who writes about Developer Ergonomics
• asm.js: optimizable, low-level JavaScript
• TypeScript playground

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