import type { Chain } from 'viem';
import { type SupportedChainName } from '../constants/chains.js';
/** Map a SupportedChainName to the corresponding viem Chain object.
 *
 *  Centralises the chain resolution logic so every package
 *  uses the same mapping and new chains only need to be added here.
 */
export declare function resolveViemChain(chainName: SupportedChainName): Chain;
/** Per-chain RPC environment variable names.
 *  Used by server, MCP server, CLI, and provider to resolve custom RPC endpoints.
 *  New chains only need to be added here.
 *
 *  Resolution order (implemented by each package's runtime layer):
 *    1. Per-chain env var (AZETH_RPC_URL_BASE_SEPOLIA, AZETH_RPC_URL_ETH_SEPOLIA, etc.)
 *    2. Chain default from SUPPORTED_CHAINS[chain].rpcDefault (always available)
 */
export declare const RPC_ENV_KEYS: Record<SupportedChainName, string>;
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