“TypeScript 7 brings native code speed, shared memory multithreading, and a number of new optimizations that typically yield speedups between 8x and 12x on full builds.”
The compiler got rewritten in Go and it now runs ten times faster. That is a genuinely big deal for anyone who has watched a large project’s type check crawl. The interesting admission buried in here: after a decade of insisting TypeScript should be written in TypeScript, Microsoft gave up and reached for a real systems language. Dogfooding is great until it costs you an order of magnitude.