Get balance on contract

balance.ts

async function getBalanceOnContract(ethSigner: ethers.Signer, zksyncProvider: zksync.Provider, token: zksync.types.TokenLike) {
    const tokenId = zksyncProvider.tokenSet.resolveTokenId(token);
    const ABI = [{
        "constant": true,
        "inputs": [
            {
                "internalType": "address",
                "name": "_address",
                "type": "address"
            },
            {
                "internalType": "uint16",
                "name": "_tokenId",
                "type": "uint16"
            }
        ],
        "name": "getBalanceToWithdraw",
        "outputs": [
            {
                "internalType": "uint128",
                "name": "",
                "type": "uint128"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    }]
    const zksContract = new ethers.Contract(zksyncProvider.contractAddress.mainContract, ABI, ethSigner.provider);
    return await zksContract.getBalanceToWithdraw(await ethSigner.getAddress(), tokenId);
}