I Automated 90% of The Ethers.js v5 v6 Migration using Codemods and AI

Ethers v6 dropped a breaking change on every project that touched BigNumber, utils, or providers — which is basically every DeFi frontend ever written. The migration guide listed over 40 breaking changes. Some were simple renames. Some required understanding whether a variable was a BigNumber before deciding what to do with it. Doing this by hand across 31 files is exactly the kind of work that makes engineers quit. I built a codemod pipeline to handle the mechanical ones automatically — and wro