I built a 30x faster svelte-check in 2 days with AI
I built a Rust drop-in replacement for svelte-check that's 10-30x faster for Svelte 5 projects. What it does: - Parses Svelte files with a custom Rust parser - Transforms them to TSX in parallel using Rayon - Runs type-checking via Microsoft's tsgo (the native Go port of TypeScript) - Maps errors back to original .svelte locations via source maps Why it's fast: The official svelte-check uses TypeScript's Language Service API optimized for IDEs with persistent connections. Great for autocomplete but slow for batch CLI checks. svelte-check-rs writes real TSX files to disk and runs tsgo as a…
I built a 30x faster svelte-check in 2 days with AI launched on January 3, 2026 with 6 votes, #2,272 of 14,584 launches that month and more than 75% of that year's launches.
What it does
svelte-check-rs is sunsetted. Read the project history, final benchmarks, and guidance for moving to official svelte-check.
svelte-check-rs is no longer maintained. Official svelte-check now offers native TypeScript checking and incremental caching, closing the gap that inspired this project. Archived September 5, 2026. Source and releases remain available; no further fixes or releases are planned. I started svelte-check-rs in January 2026, before official svelte-check offered TSGO or incremental compilation. On my own workloads, early versions made checks more than ten times faster. That changed how often I could run them and how quickly I could get back to building. I shared the project hoping it would do the same for other Svelte developers. Since then, official svelte-check has added native checking and…from svelte-check-rs.vercel.app
In the maker’s words, at launch
I built a Rust drop-in replacement for svelte-check that's 10-30x faster for Svelte 5 projects. What it does: - Parses Svelte files with a custom Rust parser - Transforms them to TSX in parallel using Rayon - Runs type-checking via Microsoft's tsgo (the native Go port of TypeScript) - Maps errors back to original…
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