Member-only story
tsrs: Up to 8× Faster Than TypeScript 7.0
TypeScript 7.0 Was Fast. Then Came tsrs. What this Means for Developers?
You change a few lines of TypeScript. Then you wait for the checker. Your AI coding agent makes another change. Then it waits, too.
When that loop happens all day, the compiler starts to feel like the busiest coffee machine in the office. Everyone needs it. Everyone is standing in line.
A post from Peter Steinberger on October 20, 2026 points to an interesting development: tsrs, a Rust port of the TypeScript compiler. He reported switching over during the weekend and seeing roughly a fivefold speedup for the project he called “OC.”
That is his reported result, rather than a benchmark run for this article. In a follow-up, he explained that his previous compiler was already a 7.1 development build. That detail matters when we compare the numbers.
But there is a bigger story here than a faster progress bar. It is about what AI can help developers build when the design, source code, and tests already exist.
First, what does a TypeScript compiler actually do?
Think of TypeScript as JavaScript with an extra set of checks. If a function expects a number and you pass it a…
