marcj/TypeRunner
High-performance TypeScript compiler observed · 2026-08-28
Health v2 · maintenance only
37/100
- Activity 10
- Release rhythm 35
- Longevity 100
Flags: no_releases
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-02. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 1492
- days_rel: n/a
- days_push: 545
- n_releases_24m: 0
Adoption not part of the score
2657 stars · 39 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded
TypeRunner is a high-performance TypeScript type checker written in C++ that compiles TypeScript to bytecode and executes it in a custom virtual machine, claiming hundred- to thousand-fold speedups over tsc. It is currently a proof of concept (~30k LoC) aiming to also provide a language server, native library for other languages, and optional transpiling.
Use cases
- type check typescript code much faster than tsc
- use typescript type information from other languages without a js engine
- replace schema with typescript types as a dsl
- use typescript types for orm definitions or protocol buffer schemas
- interactively debug typescript types
When to avoid
- you need a drop-in replacement for the official tsc compiler
- your code relies on JSDoc types or many legacy compiler options
- you need a production-ready, fully featured type checker today
Facets
library · maturity experimental
compiler type-system cli parser programming-languages compilers developer-tools performance cpp cross-platform cli typescript type-checking bytecode virtual-machine proof-of-concept
1 source
- readme: https://github.com/marcj/TypeRunner · fetched 2026-08-28 · c1d2162cb577
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| marcj/TypeRunner | main | 37 |
For agents
markdown · JSON · MCP: product_card(name="marcj/TypeRunner")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem