TLDR Dev · ARTICLES & TUTORIALS

REWRITING OUR RUST WASM PARSER IN TYPESCRIPT

openui.com8 min read

Summary from the TLDR Dev newsletter

The OpenUI team built their parser in Rust/WASM, but experienced the "WASM Boundary Tax": the overhead of copying data between JavaScript and WASM. After trying multiple solutions, they rewrote the entire parser in TypeScript and implemented an O(N) statement-level incremental caching system to improve streaming performance over the prior O(N²) re-parsing approach.