Interface GasEstimator

class CustomGasEstimator implements GasEstimator {
  chain: SupportedChain;
  entryPoints: EntryPoints;
  simulationLimits: SimulationLimits;

  async estimateUserOperationGas(params: EstimateUserOperationGasParams) {
    // Custom implementation
  }

  async estimatePreVerificationGas(userOperation: UserOperation) {
    // Custom implementation
  }
}
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interface GasEstimator {
    chain: {
        chainId: number;
        eip1559: boolean;
        entryPoints?: {
            v060?: { address: string };
            v070?: {
                address: string;
                state?: { deposits: Record<string, { stateKey: string }> };
            };
        };
        isTestnet: boolean;
        name: string;
        nativeCurrency?: string;
        paymasters: {
            v060?: Record<string, { dummyPaymasterAndData: string; type: string }>;
            v070?: Record<
                string,
                { dummyPaymasterData: string; postOpGasLimit: bigint; type: string },
            >;
        };
        simulation?: {
            callGasLimit: bigint;
            preVerificationGas: bigint;
            verificationGasLimit: bigint;
        };
        smartAccountSupport: { nexus: boolean; smartAccountsV2: boolean };
        stack: ChainStack;
        stateOverrideSupport: {
            balance: boolean;
            bytecode: boolean;
            stateDiff: boolean;
        };
    };
    entryPoints: EntryPoints;
    estimatePreVerificationGas: (
        userOperation: UserOperation,
        baseFeePerGas: bigint,
    ) => Promise<bigint>;
    estimateUserOperationGas: (
        params: EstimateUserOperationGasParams,
    ) => Promise<EstimateUserOperationGasResult>;
    simulationLimits: SimulationLimits;
}

const preVerificationGas = await estimator.estimatePreVerificationGas(
  userOperation,
  1000000000n // optional baseFeePerGas
);
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const estimate = await estimator.estimateUserOperationGas({
  unEstimatedUserOperation: {
    sender: "0x123...",
    nonce: 1n,
    // ... other fields without gas parameters
  },
  baseFeePerGas: 1000000000n
});
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