@openzeppelin/hardhat-upgrades/src/utils/ethers.ts

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import { Contract, ContractFactory, ContractRunner, Signer } from 'ethers';

/**
 * Attaches a ContractFactory to an address and returns a Contract instance.
 */
export function attach(contractFactory: ContractFactory, address: string): Contract {
  return contractFactory.attach(address) as Contract; // Needed because ethers attach returns a BaseContract.
}

/**
 * Best effort to get a signer from a ContractRunner. Returns undefined if the runner is not a signer.
 */
export function getSigner(runner?: null | ContractRunner): Signer | undefined {
  return runner && 'getAddress' in runner ? (runner as Signer) : undefined;
}