Lesson7 Mocking: Cannot read properties of undefined (reading 'length'): Tried answers from past discussions.

[Rishi860]

Getting the same error

Error: ERROR processing /home/rishi860/hardhat/hardhat-fund-me/deploy/00-deploy-mock.js:
TypeError: Cannot read properties of undefined (reading 'length')
    at getFrom (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:1713:14)
    at _deploy (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:533:9)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at _deployOne (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/helpers.ts:1004:16)
    at Object.module.exports [as func] (/home/rishi860/hardhat/hardhat-fund-me/deploy/00-deploy-mock.js:14:5)
    at DeploymentsManager.executeDeployScripts (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1219:22)
    at DeploymentsManager.runDeploy (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1052:5)
    at SimpleTaskDefinition.action (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:219:14)
    at Environment.run (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:131:14)
    at DeploymentsManager.executeDeployScripts (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1222:19)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at DeploymentsManager.runDeploy (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/DeploymentsManager.ts:1052:5)
    at SimpleTaskDefinition.action (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:438:5)
    at Environment._runTaskDefinition (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:219:14)
    at Environment.run (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:131:14)
    at SimpleTaskDefinition.action (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:584:32)
    at Environment._runTaskDefinition (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:219:14)
    at Environment.run (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat/src/internal/core/runtime-environment.ts:131:14)
    at SimpleTaskDefinition.action (/home/rishi860/hardhat/hardhat-fund-me/node_modules/hardhat-deploy/src/index.ts:669:5)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

here's my files

00-deploy-mock.js

const { network } = require("hardhat");
const {
  devlopmentChains,
  DECIMALS,
  INITIAL_ANSWER,
} = require("../helper-hardhat-config");

module.exports = async ({ getNamedAccounts, deployments }) => {
  const { deploy, log } = deployments; // deploy and log are some functions
  const { deployer } = await getNamedAccounts();

  if (devlopmentChains.includes(network.name)) {
    log("Local network detected! Deploying Mocks...");
    await deploy(
      ("MockV3Aggregator",
      {
        contract: "MockV3Aggregator",
        from: deployer,
        log: true,
        args: [DECIMALS, INITIAL_ANSWER],
      })
    );
    log("Mocks deployed");
    log("____________________");
  }
};

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

hardhat.config.js

module.exports = {
  solidity: {
    compilers: [{ version: "0.8.8" }, { version: "0.6.6" }],
  },
  defaultNetwork: "hardhat",
  networks: {
    ropsten: {
      url: process.env.ROPSTEN_URL || "",
      accounts: [],
    },
  },
  gasReporter: {
    enabled: process.env.REPORT_GAS !== undefined,
    currency: "USD",
  },
  etherscan: {
    apiKey: process.env.ETHERSCAN_API_KEY,
  },
  namedAccounts: {
    deployer: {
      default: 0, // here this will by default take the first account as deployer
    },
    user: {
      default: 1,
    },
  },
};

fundme.sol

 AggregatorV3Interface public priceFeed;
    
    constructor(address priceFeedAddress) {
        i_owner = msg.sender;
        priceFeed = AggregatorV3Interface(priceFeedAddress);
    }

    function fund() public payable {
        require(msg.value.getConversionRate(priceFeed) >= MINIMUM_USD, "You need to spend more ETH!");
        // require(PriceConverter.getConversionRate(msg.value) >= MINIMUM_USD, "You need to spend more ETH!");
        addressToAmountFunded[msg.sender] += msg.value;
        funders.push(msg.sender);
    }

Please help me find the error.

[M1708]

Is this the right syntax?

enabled: process.env.REPORT_GAS !== undefined,

Or should it be

enabled: process.env.REPORT_GAS != undefined,

[Rishi860]

Syntax wise we can use !== also. It just allows the possibility for if statement to be more precise.

[alymurtazamemon]

@Rishi860 should show you helper config

[alymurtazamemon]

@Rishi860 Found the issue, Wooow it was really silly!

await deploy(
      ("MockV3Aggregator",
      {
        contract: "MockV3Aggregator",
        from: deployer,
        log: true,
        args: [DECIMALS, INITIAL_ANSWER],
      })
    );

Update with

await deploy("MockV3Aggregator", {
      contract: "MockV3Aggregator",
      from: deployer,
      log: true,
      args: [DECIMALS, INITIAL_ANSWER],
    });

[Rishi860]

Thanks a lot!!! I messed up real big

[alymurtazamemon]

@Rishi860 It took me lots of time, I re-check again and again to find the mistake.

[Rishi860]

yea I am sorry, it must have wasted a lot of time.
One question was this error capable of being caught in linting?

[alymurtazamemon]

@Rishi860 No, No you didn't waste, it actually helps me to sharpen my error-finding skills.

No linting doesn't show this.