resolveAddress

function resolveAddress(target): string | Promise<string>

addr = '0x6B175474E89094C44Da98b954EedeAC495271d0F';

// Addresses are return synchronously
resolveAddress(addr, provider);

// Address promises are resolved asynchronously
resolveAddress(Promise.resolve(addr));

// Addressable objects are resolved asynchronously
contract = new Contract(addr, []);
resolveAddress(contract, provider);