# cristianoc/TScert

> A research verifier for TypeScript functions: it accepts a function only with a proof of type safety, and the checker's soundness is itself proved in Lean 4. It rejects `any`, type assertions and unchecked array reads that `tsc` lets through.

- Magnitude: 1.2 out of 10 — Steady
- Stars: 142 total · +1 star measured 2026-11-09, 00:09–02:17 UTC, ≈ 3 by evening
- Star trust: star growth looks organic
- Category: Developer tools · Language: TypeScript · Created: 2026-10-16 · Last push: 2026-11-09
- GitHub: https://github.com/cristianoc/TScert · Page: https://gitnova.dev/en/r/cristianoc/TScert

## Useful for

- Check a single TypeScript function for type safety via `make check FILE=...`
- Find spots where `tsc` allows reading `undefined` from an array after `pop`
- Study the formal semantics and typing rules of a TypeScript subset in Lean

## Why it’s here

- Star-counter measurements on 2026-11-09 (UTC), 00:09–02:17: 141 → 142 stars (+1). This is the change over that interval.
- Estimated end-of-day forecast: about +3 stars, using observed gains and the previous day.
- The repository is 24 days old and already has 142 stars.
- Hacker News: “TScert: A Sound Core for TypeScript” — 25 points, 4 days ago.
- Recent forks include notable developers: @robertpenner (589 followers).

## Star trust

Star growth looks organic.

Star-trust labels are heuristics based on the repository’s behavior, not a check of every stargazer.

## Numbers

- Forks: 3
- Issues and pull requests: 129
- Watchers: 1
- Average over the last week: 21 per day
- Usual pace: 0 per day
- Stars in the last hour (measured): 1
- Latest release: v0.94 (2026-11-04)

## Stars per day, last 25 days (oldest → newest, today is partial)

2026-10-16 … 2026-11-09: 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 101, 34, 2, 4, 1, 1

## Magnitude by day, last 5 days

11-05 5.1, 11-06 4.5, 11-07 2.0, 11-08 1.6, 11-09 1.2

## Hacker News

- TScert: A Sound Core for TypeScript — 25 points, 11 comments: https://news.ycombinator.com/item?id=50366465

## Spotted in now

- Spotted on Hacker News

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   A Lean-based backend framework where authorization safety is formally proven. Developers write only a Cedar schema and policies, while handlers can be generated by AI agents; every build checks that no HTTP request sequence can exceed…
   Full card: https://gitnova.dev/en/r/NyxFoundation/nyxis.md

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Magnitude (0–10) measures how fast and how unusually interest in a repository is growing right now. It is not a quality score.
Days are UTC. “So far today” is a fact; “expected by the end of the day” is a forecast.
Summaries and use cases are written by an LLM (DeepSeek V4.1 Flash) from the README and may be inaccurate: verify specific claims (benchmarks, speed, hardware) in the repository itself.
Data as of 2026-11-09 02:18 UTC, updated every 30 minutes.