chain configs

yarn add @gfxlabs/oku-chains

go get gfx.cafe/gfx/chain-config/dist/networks

Adding a chain viem doesn't ship yet

When a chain is not exported from viem/chains, define it under src/internal-chains/ using makeInternalChain and then consume it from src/definitions/ just like any viem/chains import.

1. Create src/internal-chains/<chain>.ts:

   import { makeInternalChain } from "./util";
   
   export const mychain = makeInternalChain({
     id: 1234,
     name: "My Chain",
     nativeCurrency: { name: "Token", symbol: "TKN", decimals: 18 },
     rpcUrls: { default: { http: ["https://rpc.mychain.example"] } },
     blockExplorers: {
       default: { name: "Explorer", url: "https://explorer.example" },
     },
   });

2. Re-export it from src/internal-chains/index.ts (this barrel is maintained by hand; barrelsby only regenerates src/definitions/).

3. Create src/definitions/<chain>.ts and import from ../internal-chains instead of viem/chains:

   import { mychain as chain } from "../internal-chains";
   import { makeConfig } from "../util";
   
   export const mychain = makeConfig({ ...chain /* oku fields */ });

4. Register it in the MAINNET_CHAINS array in src/index.ts.

When viem upstream merges the chain, swap the import in step 3 back to viem/chains and delete the internal definition. No other consumer changes are required — makeInternalChain returns a full viem Chain.