Porting 100,000 Lines from TypeScript to Rust Using AI-Assisted Code Migration
By
ibobev
4mo ago· 16 min readenInsight
100/100
Golden Brown
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Summary
The article describes a personal project to port 100,000 lines of code from TypeScript to Rust using Claude Code AI tools. The author was inspired by claims about AI-assisted large-scale code migration and decided to test the feasibility by converting the Pokemon Showdown battle simulator from JavaScript/TypeScript to Rust for better performance in AI training loops. The article details the technical challenges, process, and results of using AI tools for code translation, including performance improvements, memory usage changes, and the practical realities of AI-assisted code migration versus manual engineering.
Key quotes
· 4 pulledI read this post 'Our strategy is to combine AI and Algorithms to rewrite Microsoft's largest codebases [from C++ to Rust]. Our North Star is '1 engineer, 1 month, 1 million lines of code.' and it got me curious, how difficult is it really?
I've long wanted to build a competitive Pokemon battle AI after watching a lot of WolfeyVGC and following the PokéAgent challenge at NeurIPS.
Thankfully there's an open source project called 'Pokemon Showdown' that implements all the rules but it's written in JavaScript which is quite slow to run in a training loop.
So my holiday project came to life: port Pokemon Showdown from TypeScript to Rust using Claude Code to see how far AI-assisted code migration has come.
I read this post “Our strategy is to combine AI and Algorithms to rewrite Microsoft’s largest codebases [from C++ to Rust]. Our North Star is ‘1 engineer, 1 month, 1 million lines of code.” and it got me curious, how difficult is it really?
