import { Contract, ContractFactory, ContractRunner, Signer } from 'ethers';
/**
 * Attaches a ContractFactory to an address and returns a Contract instance.
 */
export declare function attach(contractFactory: ContractFactory, address: string): Contract;
/**
 * Best effort to get a signer from a ContractRunner. Returns undefined if the runner is not a signer.
 */
export declare function getSigner(runner?: null | ContractRunner): Signer | undefined;
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