import { ClientWithEns } from "@ensdomains/ensjs/dist/types/contracts/consts";
import { Address } from "viem";
/**
 * Creates a plugin that extends the PublicClient with ENS resolution capabilities.
 * This plugin adds the ability to perform reverse ENS lookups using both on-chain
 * and API-based resolution methods.
 *
 * @returns A function that extends the client with the getEnsFromAddress method
 */
export declare function primaryName(): (client: ClientWithEns) => {
    /**
     * Performs reverse ENS resolution for a given Ethereum address.
     * First attempts on-chain resolution, then falls back to API-based lookup.
     *
     * @param address - The Ethereum address to resolve
     * @returns The primary ENS name associated with the address, or null if none found
     * @throws Error if the current chain ID is not supported (must be mainnet or sepolia)
     *
     * @example
     * ```typescript
     * const ensName = await client.getEnsFromAddress('0x123...')
     * if (ensName) {
     *   console.log(`ENS name: ${ensName}`)
     * }
     * ```
     */
    getEnsFromAddress(address: Address): Promise<string | null>;
};