bug: decodeLog only return indexed parameters if the Abi item name is ""

[xuht724]

Is there an existing issue for this?

• I have searched the existing issues

Package Version

2.0.5

Current Behavior

I am using view to filter and decode historical event. My code is as follows

import { createPublicClient, http } from "viem";
import { HTTP_ALCHEMY_URL } from "./config";
import { mainnet } from "viem/chains";
import { v2_factory_abi } from "./abi/factory/univ2Factory";
import { decodeEventLog } from "viem";
import { AbiEvent } from "abitype";

export const PoolCreatedEventMap: { [key: string]: AbiEvent } = {
    V2PoolCreated: {
        anonymous: false,
        inputs: [
            {
                indexed: true,
                internalType: "address",
                name: "token0",
                type: "address",
            },
            {
                indexed: true,
                internalType: "address",
                name: "token1",
                type: "address",
            },
            {
                indexed: false,
                internalType: "address",
                name: "pair",
                type: "address",
            },
            {
                indexed: false,
                internalType: "uint256",
                name: "",
                type: "uint256",
            },
        ],
        name: "PairCreated",
        type: "event",
    },
    V3PoolCreated: {
        anonymous: false,
        inputs: [
            {
                indexed: true,
                internalType: "address",
                name: "token0",
                type: "address",
            },
            {
                indexed: true,
                internalType: "address",
                name: "token1",
                type: "address",
            },
            {
                indexed: true,
                internalType: "uint24",
                name: "fee",
                type: "uint24",
            },
            {
                indexed: false,
                internalType: "int24",
                name: "tickSpacing",
                type: "int24",
            },
            {
                indexed: false,
                internalType: "address",
                name: "pool",
                type: "address",
            },
        ],
        name: "PoolCreated",
        type: "event",
    },
};

async function main() {
    let client = createPublicClient({
        chain: mainnet,
        transport: http(HTTP_ALCHEMY_URL),
    });

    const logs = await client.getContractEvents({
        address: "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f",
        abi: v2_factory_abi,
        eventName: "PairCreated",
        strict: true,
        fromBlock: 10000835n,
        toBlock: 10010835n,
    });

   // logs[0]
   // {
    //     eventName: 'PairCreated',
    //     args: [ '0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc', 1n ],
    //     address: '0x5c69bee701ef814a2b6a3edd4b1652cb9cc5aa6f',
    //     blockHash: '0x359d1dc4f14f9a07cba3ae8416958978ce98f78ad7b8d505925dad9722081f04',
    //     blockNumber: 10008355n,
    //     data: '0x000000000000000000000000b4e16d0168e52d35cacd2c6185b44281ec28c9dc0000000000000000000000000000000000000000000000000000000000000001',
    //     logIndex: 34,
    //     removed: false,
    //     topics: [
    //       '0x0d3648bd0f6ba80134a33ba9275ac585d9d315f0ad8355cddefde31afa28d0e9',
    //       '0x000000000000000000000000a0b86991c6218b36c1d19d4a2e9eb0ce3606eb48',
    //       '0x000000000000000000000000c02aaa39b223fe8d0a0e5c4f27ead9083c756cc2'
    //     ],
    //     transactionHash: '0xd07cbde817318492092cc7a27b3064a69bd893c01cb593d6029683ffd290ab3a',
    //     transactionIndex: 38
    //   }

    let res = decodeEventLog({
        abi: [PoolCreatedEventMap.V2PoolCreated],
        data: logs[0].data,
        topics: logs[0].topics,
    }).args;
    console.log(res);
    // {
    //     eventName: 'PairCreated',
    //     args: [ '0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc', 1n ]
    //   }
}

main();

I want to ask how to decode log and get indexed parameter?. I want to get result like

Expected Behavior

I notice that the result is caused the Abi of "PairCreated" event is

{
        anonymous: false,
        inputs: [
            {
                indexed: true,
                internalType: "address",
                name: "token0",
                type: "address",
            },
            {
                indexed: true,
                internalType: "address",
                name: "token1",
                type: "address",
            },
            {
                indexed: false,
                internalType: "address",
                name: "pair",
                type: "address",
            },
            {
                indexed: false,
                internalType: "uint256",
                name: "",
                type: "uint256",
            },
        ],
        name: "PairCreated",
        type: "event",
    }

I think the result should be
['0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48','0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2','0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc',1n],
If you set name for the forth parameter, you can get correct args.

args: {
    token0: '0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48',
    token1: '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2',
    pair: '0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc',
    index: 1n
  }

Steps To Reproduce

No response

Link to Minimal Reproducible Example (StackBlitz, CodeSandbox, GitHub repo etc.)

No response

Anything else?

No response