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Import source verified before any rename — user-defined hooks with same names are never touched - Exact text match prevents substring collisions (e.g. `useContractRead` never matches `useContractReads`) - String-aware comma splitting — commas inside string values never cause incorrect splits - `watch: true` preserved on `useBlockNumber` and `useBlock` (still valid in v2) - Non-overlapping edits — TODO comments inserted before statements, never inside renamed nodes - `useSwitchNetwork` renamed in-place by transform 01, not removed by transform 08 ## What needs manual work (flagged with TODO) | Pattern | Why manual | |---|---| | `configureChains` | Requires Viem transport setup specific to each RPC provider | | `watch: true` removal | Replacement pattern depends on component structure | | `usePrepareContractWrite` destructuring | `config` → `data.request` | | `useNetwork().chain` | Returns `chainId` (number not Chain object) | | `useWriteContract` args | Contract config moves from hook to `writeContract()` call site | | `useSwitchChain` result | `switchNetwork` → `switchChain` | | `useWalletClient` result | Viem `WalletClient` not ethers `Signer` | | `useWaitForTransactionReceipt` hash | Type changes from `string` to `` 0x${string} `` | ## Install wagmi v2 peer dependencies ```bash npm install wagmi viem@2.x @tanstack/react-query ``` ## Wrap your app with QueryClientProvider ```tsx import { QueryClient, QueryClientProvider } from '@tanstack/react-query' import { WagmiProvider } from 'wagmi' import { config } from './config' const queryClient = new QueryClient() function App() { return ( {/* your app */} ) } ``` ## Running tests ```bash npm test ``` Or individually: ```bash npx codemod jssg test -l tsx ./scripts/01-rename-hooks.ts ./tests/fixtures --filter "rename-hooks" npx codemod jssg test -l tsx ./scripts/02-rename-wagmi-provider.ts ./tests/fixtures --filter "rename-provider" npx codemod jssg test -l tsx ./scripts/03-replace-prepare-hooks.ts ./tests/fixtures --filter "prepare-hooks" npx codemod jssg test -l tsx ./scripts/04-move-query-params.ts ./tests/fixtures --filter "query-params" npx codemod jssg test -l tsx ./scripts/05-remove-watch-prop.ts ./tests/fixtures --filter "watch-prop" npx codemod jssg test -l tsx ./scripts/06-rename-connectors.ts ./tests/fixtures --filter "connectors" npx codemod jssg test -l tsx ./scripts/06-rename-connectors.ts ./tests/fixtures --filter "core-connectors" npx codemod jssg test -l tsx ./scripts/07-rename-config-api.ts ./tests/fixtures --filter "config-api" npx codemod jssg test -l tsx ./scripts/08-cleanup-imports.ts ./tests/fixtures --filter "cleanup-imports" npx codemod jssg test -l tsx ./scripts/08-cleanup-imports.ts ./tests/fixtures --filter "multiline-import" npx codemod jssg test -l tsx ./scripts/08-cleanup-imports.ts ./tests/fixtures --filter "type-imports" npx codemod jssg test -l tsx ./scripts/01-rename-hooks.ts ./tests/fixtures --filter "write-contract-shape" ``` ## Real-world benchmark Tested on the official wagmi v1 examples (`wevm/wagmi@1.x` branch): - **27 files scanned** - **10 files changed automatically** - **~85% of migration patterns automated** - **6 TODO comments** added for AI/manual resolution - **0 false positives** ## Project structure ``` wagmi-v1-to-v2/ ├── codemod.yaml ← package metadata ├── workflow.yaml ← orchestrates all transforms + AI step ├── .codemodignore ← excludes test/generated/dist files ├── CHANGELOG.md ├── scripts/ │ ├── 01-rename-hooks.ts ← hook renames + return shape TODOs │ ├── 02-rename-wagmi-provider.ts ← WagmiConfig → WagmiProvider │ ├── 03-replace-prepare-hooks.ts ← prepare hooks → simulate/estimateGas │ ├── 04-move-query-params.ts ← enabled/staleTime → query:{} │ ├── 05-remove-watch-prop.ts ← watch removal (safe for useBlockNumber) │ ├── 06-rename-connectors.ts ← connector class → factory fn │ ├── 07-rename-config-api.ts ← createClient, useNetwork │ └── 08-cleanup-imports.ts ← remove stale v1 import specifiers └── tests/fixtures/ ├── rename-hooks/ ├── rename-provider/ ├── prepare-hooks/ ├── query-params/ ├── watch-prop/ ├── connectors/ ├── core-connectors/ ├── config-api/ ├── cleanup-imports/ ├── multiline-import/ ├── type-imports/ └── write-contract-shape/ ``` 49:T6a1,import { useReadContract, useWriteContract, useWatchContractEvent, useReadContracts, useWaitForTransactionReceipt, useSwitchChain, useWalletClient, usePublicClient, useEstimateFeesPerGas, } from 'wagmi'; function Component() { const { data } = useReadContract({ address: '0x0000000000000000000000000000000000000001', abi, functionName: 'name' }); // TODO(wagmi-codemod): useWriteContract API changed significantly. // 1. Rename: write → writeContract, writeAsync → writeContractAsync // 2. Contract config (address, abi, functionName, args) moves from hook args to writeContract() call site. // Before: const { write } = useContractWrite({ address, abi, functionName }); write() // After: const { writeContract } = useWriteContract(); writeContract({ address, abi, functionName, args }) const { write } = useWriteContract({ address: '0x0000000000000000000000000000000000000001', abi, functionName: 'mint' }); // TODO(wagmi-codemod): useWalletClient returns a Viem WalletClient, not an ethers Signer. // Update all code that uses the result as an ethers Signer. const { data: signer } = useWalletClient(); const provider = usePublicClient(); const { data: fee } = useEstimateFeesPerGas(); // TODO(wagmi-codemod): useWaitForTransactionReceipt: hash type changed from string to 0x${string}. // Ensure hash is typed as `0x${string} | undefined` not `string | undefined`. const { isLoading } = useWaitForTransactionReceipt({ hash }); // TODO(wagmi-codemod): useSwitchChain return shape changed. // Rename destructured result: switchNetwork → switchChain, switchNetworkAsync → switchChainAsync const { switchNetwork } = useSwitchChain(); return null; } 18:[["$","script",null,{"type":"application/ld+json","dangerouslySetInnerHTML":{"__html":"$46"}}],["$","$L47",null,{"state":{"mutations":[],"queries":[{"state":{"data":{"json":{"id":"fda378c2-41ef-4432-8616-161688c90af1","name":"waleedbhattiii-wagmi-v1-to-v2","displayName":"waleedbhattiii-wagmi-v1-to-v2","description":"Migrate wagmi v1 to v2. 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