How I automated the Anchor IDL v0 to v1 migration with a codemod

Case Study: Automating Anchor IDL v0 → v1 Migration with Codemod Background Anchor v0.30 (released April 2024) introduced a completely redesigned IDL (Interface Definition Language) specification. Every Solana program built with Anchor The problem: migrating these IDLs manually is tedious, error-prone, and blocks developers from using Anchor's new declare_program! macro and TypeScript client generator. Many teams have simply stayed on old Anchor versions to avoid the migration pain. What We Buil