/* case study */
90k-Line Next.js → TypeScript Migration
Independently migrated a ~90,000-line Next.js JavaScript codebase to TypeScript in about two months using LLM agents.
// impact: ~90k LOC converted in ~2 months, solo
// Context
GoodParty's web app was a large, untyped Next.js codebase, which was slowing development and limiting how well AI tooling could help.
// Challenges
- ›~90k lines of JavaScript with no type safety
- ›Regressions slipping through, and weak context for agentic development
// Approach
- ›Wrote structured prompts and rules files to drive LLM agents through safe, incremental conversion
- ›Set up a scalable component library with RadixUI and Tailwind CSS
// Outcomes
- ›Full conversion in about 2 months by one engineer
- ›Better type safety and fewer regressions
- ›Stronger context for ongoing agentic development