TypeError: Cannot read properties of undefined (reading 'length')

[MuhammadLuqman-99]

01-deploy-lottery.js

const { network, ethers } = require("hardhat")
const { developmentChains, networkConfig } = require("../helper-hardhat-config")
const { verify } = require("../utils/verify")

const VRF_SUB_FUND_AMOUNT = ethers.utils.parseEther("2")

module.exports = async function ({ getNamedAccounts, deployments }) {
    const { deploy, log } = deployments
    const { deployer } = getNamedAccounts
    const chainId = network.config.chainId
    let vrfcoodinatorV2Address

    if (chainId == 31337) {
        const VRFCoordinatorV2Mock = await ethers.getContract("VRFCoordinatorV2Mock")
        vrfcoodinatorV2Address = VRFCoordinatorV2Mock.address
        const transactionResponse = await VRFCoordinatorV2Mock.createSubscription()
        const transactionReceipt = await transactionResponse.wait(1)
        subscriptionId = transactionReceipt.events[0].args.subId
        // Fund the subscription
        // Usually, you will need link token on a real network
        VRFCoordinatorV2Mock.fundSubscription(subscriptionId, VRF_SUB_FUND_AMOUNT)
    } else {
        vrfcoodinatorV2Address = networkConfig[chainId]["vrfCoordinatorv2"]
        subscriptionId = networkConfig[chainId]["subscriptionId"]
    }

    const entraceFee = networkConfig[chainId]["entraceFee"]
    const gasLane = networkConfig[chainId]["gasLane"]
    const callbackGasLimit = networkConfig[chainId]["callbackGasLimit"]
    const interval = networkConfig[chainId]["interval"]

    const args = [
        vrfcoodinatorV2Address,
        entraceFee,
        gasLane,
        subscriptionId,
        callbackGasLimit,
        interval,
    ]
    const lottery = await deploy("Lottery", {
        from: deployer,
        args: args,
        log: true,
        waitConfirmation: network.config.blockConfirmations || 1,
    })

    if (!developmentChains.includes(network.name) && process.env.ETHERSCAN_API_KEY) {
        log("Verifying...")
        await verify(raffle.address, arguments)
    }

    log("---------------------------")
}

module.exports.tags = ["all", "lottery"] 

00-deploy-mocks.js

const { getNamedAccounts, deployments, network, ethers } = require("hardhat")
const { deploymentChains } = require("../helper-hardhat-config")

const BASE_FEE = ethers.utils.parseEther("0.25") // 0.25 is this the premium in LINK
const GAS_PRICE_LINK = 1e9// 100000000 // link per gas // calculated value based on the gas price of the chain

// ETH price up to $1,000,000,000
// Chainlink nodes pay the gas fee given us randomness & do external execution
// so the price of request change based on the price of gas

module.exports = async function ({ getNamedAccounts, deployments}) {
    const { deploy, log } = deployments
    const { deployer } = getNamedAccounts
    const args = [BASE_FEE, GAS_PRICE_LINK]

    if(deploymentChains.includes(network.name)) {
        log("Local network detected! Deploying mocks....")
        // deploy mocks vrfcoodinator
        await deploy("VRFCoordinatorV2Mock", {
            from: deployer,
            log: true,
            agrs: args,
        })
        log("Mocks deployed!")
        log("----------------------------------------")
    }
}

module.exports.tags = ["all", "mocks"]

helper-hardhat-config.js

const { ethers } = require("hardhat")

const networkConfig = {
    default: {
        name: "hardhat",
        keepersUpdateInterval: "30",
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // 30 gwei
    },
    4: {
        name: "rinkeby",
        vrfCoordinatorv2: "0x6168499c0cFfCaCD319c818142124B7A15E857ab",
        entraceFee: ethers.utils.parseEther("0.01"),
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc", // 30 gwei
        subscriptionId: "0",
        callbackGasLimit: "500000", // 500,000
        interval: "30",
    },
    31337: {
        name: "hardhat",
        entraceFee: ethers.utils.parseEther("0.01"),
        gasLane: "0xd89b2bf150e3b9e13446986e571fb9cab24b13cea0a43ea20a6049a85cc807cc",
        callbackGasLimit: "500000", // 500,000
        interval: "30",
    }
}

const deploymentChains = ["hardhat", "localhost"]

module.exports = {
    networkConfig,
    deploymentChains,
}

///
can someone help i already put gaslane at default but still get error
///

[xdd825]

I think the problem is in your 00-deploy-mocks.js , add ( ) behind getNamedAccounts
const { deployer } = getNamedAccounts
should be
const { deployer } = getNamedAccounts()

[MuhammadLuqman-99]

thanks