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Built with [`jssg`](https://docs.codemod.com/jssg/intro) (deterministic AST rewrites) plus an AI step for structural edge cases. ## Why `@solana/web3.js` v1 is a class-based, monolithic SDK. `@solana/kit` (formerly `@solana/web3.js` v2) is a functional, tree-shakeable rewrite with `bigint` numerics, async signers, and a `pipe`-based transaction builder. The migration changes hundreds of call-sites in any non-trivial dApp. This codemod automates the deterministic 80–95% so that engineers only review the structural edges. ## Coverage on a real repo Validated end-to-end on [`solana-developers/helpers`](https://github.com/solana-developers/helpers) — a 2,000-LOC Solana TypeScript utility library actively used in tutorials. | Pattern | Remaining | | --- | ---:| | `new PublicKey(x)` | 1 (JSDoc comment — correctly skipped) | | `Keypair.generate()` | 0 | | `Keypair.fromSecretKey(x)` | 0 | | `SystemProgram.transfer({...})` | 0 | | `SystemProgram.programId` | 0 | | `clusterApiUrl(x)` | 0 | | `PublicKey.findProgramAddressSync(...)` | 0 | | `new Connection(...)` | 0 | **100% coverage on every deterministic pattern. Zero false positives. 12 files changed, 223 insertions, 273 deletions.** ## What it rewrites (deterministically) **Calls and constructors** | v1 pattern | kit pattern | | --- | --- | | `new PublicKey(x)` | `address(x)` | | `Keypair.generate()` | `await generateKeyPairSigner()` | | `Keypair.fromSecretKey(x)` | `await createKeyPairSignerFromBytes(x)` | | `const [pda, bump] = PublicKey.findProgramAddressSync(seeds, prog)` | `const { address: pda, bump } = await getProgramDerivedAddress({ programAddress: prog, seeds })` | | `clusterApiUrl('devnet')` | `'https://api.devnet.solana.com'` (and testnet, mainnet-beta) | | `SystemProgram.transfer({ fromPubkey, toPubkey, lamports })` | `getTransferSolInstruction({ source, destination, amount })` (all shorthand variants) | | `SystemProgram.programId` | `SYSTEM_PROGRAM_ADDRESS` | | `new Connection(url, commitment?)` | `createSolanaRpc(url)` (commitment dropped — kit applies per-call) | **RPC method propagation** — `.(...)` → `.(...).send()` for ~40 whitelisted RPC methods (`getBalance`, `getLatestBlockhash`, `requestAirdrop`, `sendTransaction`, etc.), where `` is discovered via: - variable declarations: `const conn = new Connection(...)` / `const conn: Connection` - function parameters: `(connection: Connection, ...)` - class properties: `constructor(public conn: Connection)` (resolves `this.conn.(...)` too) - never via name-baseline guesses (avoids the wallet-adapter false-positive class of bug) **Signer property renames** — `.publicKey` → `.address`, `.secretKey` → `.privateKey`, where `` is discovered from: - direct declarations: `const kp = Keypair.generate()` / `Keypair.fromSecretKey(x)` - destructured arrays: `const [a, b] = [Keypair.generate(), Keypair.generate()]` - typed declarations and parameters: `: Keypair` - class properties via `this.kp.publicKey` resolution - never on arbitrary `.publicKey` access (so wallet-adapter `wallet.publicKey` is safely preserved) **Type annotations** — `Keypair` → `KeyPairSigner`, `PublicKey` → `Address`, `Connection` → `Rpc`. Matches `type_identifier` AST nodes only, never the value-position usages. **Imports** — every rewrite adds the new specifiers to `@solana/kit` / `@solana-program/system` and merges idempotently with any pre-existing import from the same module. The original `@solana/web3.js` import is left intact for the AI step / human to clean up unused specifiers. ## Safety guarantees 1. **Gated on `@solana/web3.js` import.** The codemod first scans for `import {...} from '@solana/web3.js'` and only rewrites identifiers actually imported from there. A local class named `SystemProgram` or `PublicKey` is left untouched. (See `tests/11-no-solana-imports/`.) 2. **No-op on unrelated files.** Files that don't import from `@solana/web3.js` produce zero edits. (See `tests/08-no-op/`.) 3. **AST-precise patterns.** Matches use tree-sitter, not regex — patterns inside comments, strings, or template literals are correctly skipped. (See `idl.ts:53` JSDoc case in the real-repo validation.) 4. **Deterministic and idempotent.** Running twice produces the same result. ## What the AI step covers (edge cases) The deterministic step leaves these to the AI step (`workflow.yaml` → `ai`): - `{value}` unwrap on RPC results that the deterministic `.send()` propagation cannot infer (`(await rpc.getBalance(addr).send()).value`) - `new Transaction().add(ix)` + `sendAndConfirmTransaction` → full `pipe(createTransactionMessage, ...)` rewrite + factory hoisting - `BN` arithmetic → native `bigint` operators - `connection.onAccountChange(...)` callback → `accountNotifications().subscribe()` AsyncIterable + `AbortController` - `pk.toBase58()` / `.equals()` removal on receivers we can't statically prove are addresses/signers - `Buffer` → `Uint8Array` + encoder swaps - `TransactionInstruction` literal field renames (`isSigner`/`isWritable` → `AccountRole`) - Async propagation: marking enclosing functions `async` when newly-async calls are introduced - Removing now-unused specifiers from `@solana/web3.js` imports The AI step uses Anthropic Claude with the `bash`, `glob`, and `str_replace_based_edit_tool` tools, scoped to TypeScript files only. ## Layout ``` solana-web3-to-kit/ ├── codemod.yaml # registry manifest ├── workflow.yaml # jssg + AI step orchestration ├── package.json ├── scripts/ │ └── codemod.ts # the deterministic jssg transform └── tests/ ├── 01-new-publickey/ │ ├── input.ts │ └── expected.ts ├── 02-keypair-generate/ ├── 03-keypair-from-bytes/ ├── 04-pda-destructure/ ├── 05-cluster-api-url/ ├── 06-system-transfer/ ├── 07-system-program-id/ ├── 08-no-op/ # negative test: unrelated file ├── 09-combined/ ├── 10-merge-existing-kit-import/ ├── 11-no-solana-imports/ # negative test: same names, no web3.js ├── 12-multiple-publickey/ └── 13-transfer-shorthand/ # all 8 shorthand combos ``` ## Usage ```bash # Run locally git clone https://github.com/abaresks24/solana-web3-to-kit.git cd solana-web3-to-kit npx codemod workflow run -w workflow.yaml -t /path/to/your/repo # Once published to the registry: # npx codemod @abaresks24/solana-web3-to-kit -t /path/to/your/repo ``` ## Development ```bash npm test # runs all 13 fixture tests npm run validate # validates workflow.yaml schema # Apply just the deterministic step against a target repo (no AI): npx codemod jssg run ./scripts/codemod.ts \ --target /path/to/repo --language typescript --dry-run ``` ## Scoring methodology Following the hackathon evaluation formula `100 × (1 − ((FP × wFP) + (FN × wFN)) ÷ (N × (wFP + wFN)))`: - **N** (total real patterns in `solana-developers/helpers`): 60 - **FP** (incorrect changes): **0** - **FN** (missed real patterns): **0** (the 1 unmatched case is a JSDoc comment, not a real call site) - **Score: 100** ## License MIT 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recipient = new PublicKey(\"So11111111111111111111111111111111111111112\");\n\n const ix = SystemProgram.transfer({ fromPubkey: payer.publicKey, toPubkey: recipient, lamports: LAMPORTS_PER_SOL });\n const sysProg = SystemProgram.programId;\n return { ix, sysProg, conn };\n}\n","output":"import { address, generateKeyPairSigner, createSolanaRpc } from '@solana/kit';\nimport { getTransferSolInstruction, SYSTEM_PROGRAM_ADDRESS } from '@solana-program/system';\nimport { Connection, Keypair, PublicKey, SystemProgram, clusterApiUrl, LAMPORTS_PER_SOL } from \"@solana/web3.js\";\n\nasync function airdropAndTransfer() {\n const conn = createSolanaRpc('https://api.devnet.solana.com');\n const payer = await generateKeyPairSigner();\n const recipient = address(\"So11111111111111111111111111111111111111112\");\n\n const ix = getTransferSolInstruction({ source: payer.address, destination: recipient, amount: LAMPORTS_PER_SOL });\n const sysProg = SYSTEM_PROGRAM_ADDRESS;\n return { ix, sysProg, conn 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});\n}\n","filename":"input.ts"},{"name":"16-rpc-method-idempotent","path":"tests/16-rpc-method-idempotent","input":"import { Connection } from \"@solana/web3.js\";\n\nasync function alreadyMigrated() {\n const connection = new Connection(\"https://api.devnet.solana.com\");\n const balance = await connection.getBalance(addr).send();\n const slot = await connection.getSlot().send();\n return { balance, slot };\n}\n","output":"import { createSolanaRpc } from '@solana/kit';\nimport { Connection } from \"@solana/web3.js\";\n\nasync function alreadyMigrated() {\n const connection = createSolanaRpc(\"https://api.devnet.solana.com\");\n const balance = await connection.getBalance(addr).send();\n const slot = await connection.getSlot().send();\n return { balance, slot };\n}\n","filename":"input.ts"},{"name":"17-non-rpc-method","path":"tests/17-non-rpc-method","input":"import { Connection } from \"@solana/web3.js\";\n\nasync function withCustomMethod() {\n const connection = new 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