getDefaultGasOverrides

type ReturnType = Promise<
  | {
      gasPrice?: undefined;
      maxFeePerGas?: undefined;
      maxPriorityFeePerGas?: undefined;
    }
  | {
      gasPrice?: undefined;
      maxFeePerGas: BigNumber;
      maxPriorityFeePerGas: BigNumber;
    }
  | {
      gasPrice: BigNumber;
      maxFeePerGas?: undefined;
      maxPriorityFeePerGas?: undefined;
    }
>;