simulateUserOperation

simulateUserOperation is a method you can use to easily leverage the alchemy_simulateUserOperationAssetChanges API to simulate asset changes resulting from user operation.

Usage

import { smartAccountClient } from "./base-client.ts";

 
const uoStruct: UserOperationCallData = {
  target: "0xTARGET_ADDRESS",
  data: "0xDATA",
  value: 1n,
};
 
const uoSimResult = await smartAccountClient.simulateUserOperationAssetChanges({
  uo: uoStruct,
});
 
if (uoSimResult.error) {
  console.error(uoSimResult.error.message);
}
 
const uo = await smartAccountClient.sendUserOperation({ uo: uoStruct });

Returns

Promise<SimulateUserOperationAssetChangesResponse>

• changes: SimulateAssetChange[]
  • assetType: SimulateAssetType (NATIVE, ERC20, ERC721, ERC1155, orSPECIAL_NFT)
  • changeType: SimulateChangeType (APPROVE or TRANSFER)
  • from: Address
  • to: Address
  • rawAmount?: string
  • amount?: string
  • contactAddress: Address
  • tokenId?: string
  • decimals: number
  • symbol: string
  • name?: string
  • logo?: string
• error: SimulateAssetChangesError
  • message: string

Parameters

UserOperationCallData | UserOperationCallData[]

• target: Address - the target of the call (equivalent to to in a transaction)
• data: Hex - can be either 0x or a call data string
• value?: bigint - optionally, set the value in wei you want to send to the target

overrides?: UserOperationOverrides

Optional parameter where you can specify override values for maxFeePerGas, maxPriorityFeePerGas, callGasLimit, preVerificationGas, verificationGasLimit or paymasterAndData on the user operation request. You can also specify a stateOverride to be passed into eth_estimateUserOperationGas during gas estimation.