create-eth/templates/base/packages/nextjs/scaffold.config.ts.template.mjs

Create a Scaffold-ETH-2 app

import { withDefaults, stringify, deepMerge } from "../../../../templates/utils.js";

const defaultScaffoldConfig = {
    targetNetworks: ["$$chains.mainnet$$"],
    pollingInterval: 3000,
    alchemyApiKey: "$$process.env.NEXT_PUBLIC_ALCHEMY_API_KEY || DEFAULT_ALCHEMY_API_KEY$$",
    rpcOverrides: {},
    walletConnectProjectId: "$$process.env.NEXT_PUBLIC_WALLET_CONNECT_PROJECT_ID || '3a8170812b534d0ff9d794f19a901d64'$$",
    burnerWalletMode: "localNetworksOnly",
  };

const contents = ({ preContent, configOverrides, extraConfigTypeName, skipLocalChainInTargetNetworks }) => {
  // add solidityFramework network
  let targetNetworks = configOverrides.map(override => override.targetNetworks).flat().filter(network => network);
  // if skipLocalChainInTargetNetworks is true, don't include solidityFramework network
  targetNetworks = skipLocalChainInTargetNetworks?.[0] ? targetNetworks.slice(1) : targetNetworks;
  const extensionConfigOverrides = configOverrides[configOverrides.length - 1] || {};
  if (targetNetworks?.length && Object.keys(extensionConfigOverrides).length > 0) {
    extensionConfigOverrides.targetNetworks = targetNetworks;
  }

  // Merge the default config with any overrides
  const finalConfig = deepMerge(defaultScaffoldConfig, extensionConfigOverrides);

  return  `import * as chains from "viem/chains";

${preContent[0] || ''}

export type BaseConfig = {
  targetNetworks: readonly chains.Chain[];
  pollingInterval: number;
  alchemyApiKey: string;
  rpcOverrides?: Record<number, string>;
  walletConnectProjectId: string;
  burnerWalletMode: "localNetworksOnly" | "allNetworks" | "disabled";
};

export type ScaffoldConfig = BaseConfig ${extraConfigTypeName[0] ? `& ${extraConfigTypeName[0]}` : ''};

export const DEFAULT_ALCHEMY_API_KEY = "IZYEU2cWBgnFmgiTAgpWD";

const scaffoldConfig = ${stringify(finalConfig, {
  targetNetworks: "The networks on which your DApp is live",
  pollingInterval: "The interval at which your front-end polls the RPC servers for new data (it has no effect if you only target the local network (default is 4000))",
  alchemyApiKey: "This is ours Alchemy's default API key.\nYou can get your own at https://dashboard.alchemyapi.io\nIt's recommended to store it in an env variable:\n.env.local for local testing, and in the Vercel/system env config for live apps.",
  walletConnectProjectId: "This is ours WalletConnect's default project ID.\nYou can get your own at https://cloud.walletconnect.com\nIt's recommended to store it in an env variable:\n.env.local for local testing, and in the Vercel/system env config for live apps.",
  rpcOverrides: "If you want to use a different RPC for a specific network, you can add it here.\nThe key is the chain ID, and the value is the HTTP RPC URL",
  "rpcOverrides.": "Example:\n[chains.mainnet.id]: \"https://mainnet.rpc.buidlguidl.com\",",
  burnerWalletMode: "Configure Burner Wallet visibility:\n- \"localNetworksOnly\": only show when all target networks are local (hardhat/anvil)\n- \"allNetworks\": show on any configured target networks\n- \"disabled\": completely disable",
})} as const satisfies ScaffoldConfig;

export default scaffoldConfig;`;
};

export default withDefaults(contents, {
  preContent: "",
  extraConfigTypeName: "",
  configOverrides: {},
  skipLocalChainInTargetNetworks: false,
});