import { ChainTypeName } from "../constants/interopAddress.js";
/** Default onchain ENS registry domain for chain resolution. */
export declare const DEFAULT_REGISTRY_DOMAIN = "on.eth";
export interface ResolvedChainFromRegistry {
    chainType: ChainTypeName;
    chainReference: string;
}
/** Clears the resolver and resolution caches. Useful for testing. */
export declare function clearRegistryCache(): void;
/**
 * Resolves a chain label to chainType and chainReference using an onchain ENS-based registry.
 *
 * This implements forward resolution via the ChainResolver contract:
 * 1. Gets the resolver for the registry domain (e.g., on.eth) from ENS registry
 * 2. Calls interoperableAddress(label) on the resolver with the label string
 * 3. Decodes the returned ERC-7930 binary format
 *
 * Results are cached in memory. Concurrent calls for the same label+domain share a single
 * in-flight request. Transient errors are not cached and will be retried on the next call.
 *
 * @param label - The chain label to resolve (e.g., "optimism", "arbitrum", "base")
 * @param registryDomain - The ENS registry domain (e.g., "on.eth")
 * @param rpcUrl - Optional custom mainnet RPC URL. Falls back to MAINNET_RPC_URL env var, then a default public endpoint.
 * @returns The resolved chainType and chainReference, or null if resolution fails
 *
 * @example
 * ```ts
 * // Resolve "optimism" using on.eth registry
 * const result = await resolveChainFromRegistry("optimism", "on.eth");
 * // result: { chainType: "eip155", chainReference: "10" }
 * ```
 */
export declare function resolveChainFromRegistry(label: string, registryDomain: string, rpcUrl?: string): Promise<ResolvedChainFromRegistry | null>;
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