Theo says tsc-rs has completed the main port and has published compatibility and performance test results

Article

Codex wrote 1300000 didn't get it done, Claude 2 week port TypeScript compiler

Beating AI Breaking news: renowned developer Theo open-sourced tsc-rs. He had it AI port Microsoft's TypeScript 7 compiler to Rust, covering the compiler, type checker, and language server, with the goal of directly replacing the official tsc. Theo said he did not read a single line of generated code from start to finish.

The project lasted approximately 5 months. Theo initially used tools including Codex, calling multiple OpenAI models to generate more than 1300000 lines of Rust code, but compatibility never exceeded approximately 84%. Based on API list prices, the Token consumed was worth more than 400000 USD.

He later switched to Claude Opus 5.5. The model directly abandoned the previous code and restarted the port from scratch. It produced a runnable initial version in 10 hours, completed the main work within 2 weeks, and the Token consumption, calculated at API prices, was approximately 24000 USD.

Tests show that tsc-rs has passed 181,711 tests ported from Go. In 120 open-source projects, the checking results were broadly consistent with Microsoft's Go version, with only a small number of known behavioral differences. According to performance tests on 60 open-source projects, the Rust version's type checking took approximately half as long on average as the Go version.

Original link https://m.theblockbeats.info/flash/370772

Key points

Theo open-sourced tsc-rs.
tsc-rs aims to port Microsoft's TypeScript 7 compiler to Rust, covering the compiler, type checker, and language server.
The project lasted approximately 5 months.
Using tools including Codex, it generated more than 1300000 lines of Rust code, but compatibility was approximately 84%。
Based on API list prices, the aforementioned code consumed Token worth more than 400000 USD。
After switching to Claude Opus 5.5, it 10 produced a runnable initial version in 2 and completed the main work within
Claude Opus 5.5 The Token phase's API consumption, calculated at 24000 USD。
Tests show that tsc-rs passed 181711 tests ported from Go.
In 120 open-source projects, tsc-rs's checking results were broadly consistent with Microsoft's Go version, but there were a small number of known behavioral differences.
In 60 open-source projects' performance tests, the Rust version's type checking took approximately half as long on average as the Go version.

AI-assisted interpretation

The following is analysis, separate from reported facts. Verify important claims independently.

This is a project that rewrites the TypeScript 7 compiler from Go in Rust. The report relays Theo's account: the early codebase was large but had limited compatibility; it was later re-ported, achieving a higher test pass rate and shorter type-checking times.

Why it matters to readers

If these data are verified, the project could influence developers' judgments about the efficiency, cost, and delivery speed of different AI programming tools.

It demonstrates the potential of AI-assisted programming in large-scale software porting, and also shows that lines of code, test pass rate, compatibility, and performance need to be assessed separately.

Risks and unknowns

The project's progress, model versions, costs, and test results in the report mainly come from Theo's account; no independent verification materials have been seen in the evidence.
The evidence does not provide the tsc-rs code repository, test suite, list of known behavioral differences, or model usage records.
The evidence does not specify the specific method used to calculate costs.

Theo says tsc-rs has completed the main port and has published compatibility and performance test results

Article

AI-assisted interpretation

Why it matters to readers

Risks and unknowns

Related Developments

Related concepts

Keep following

Security Center