FundMe.test.js

[JimmyG37]

Good Morning, Good Afternoon, Good Evening everyone! Can someone clarify why await getNamedAccounts() is wrapped with parenthesis?

const { ethers, deployments, getNamedAccounts } = require("hardhat")
const { assert, expect } = require("chai")

describe("FundMe", function () {
    let fundMe
    let deployer
    let mockV3Aggregator
    const sendValue = ethers.utils.parseEther("1") // 1 ETH

    beforeEach(async () => {
        deployer = (await getNamedAccounts()).deployer
    })
})

My assumption was that getNamedAccounts() is treated as an object and what we're doing is declaring deployer as a key in this object. I went to take a look at getNamedAccounts() in the node_modules but the syntax confuses me

declare module 'hardhat/types/runtime' {
  interface HardhatRuntimeEnvironment {
    deployments: DeploymentsExtension;
    getNamedAccounts: () => Promise<{
      [name: string]: Address;
    }>;
    getUnnamedAccounts: () => Promise<string[]>;
    getChainId(): Promise<string>;
    companionNetworks: {
      [name: string]: {
        deployments: DeploymentsExtension;
        getNamedAccounts: () => Promise<{
          [name: string]: Address;
        }>;
        getUnnamedAccounts: () => Promise<string[]>;
        getChainId(): Promise<string>;
        provider: EthereumProvider;
      };
    };
  }

What confuses me is seeing [name: string]: Address; inside getNamedAccounts. Is it considered an array as a key? Is deployer being pushed into this array when we do this (await getNamedAccounts()).deployer? Is this the outcome?

 getNamedAccounts: () => Promise<{
      [deployer: string]: Address;
    }>;

🫠

[Muhammad-Abdullah012]

getNamedAccounts: () => Promise<{
      [deployer: string]: Address;
    }>;

In above code, [deployer: string]: Address; simply means object can have any string as property , and The value of that property will be Address type, And the function returns promise of Object ..

[JimmyG37]

Sweet thanks @Muhammad-Abdullah012 !

[Muhammad-Abdullah012]

@JimmyG37 https://www.codecademy.com/learn/learn-typescript/modules/learn-typescript-advanced-object-types/cheatsheet
see the 2nd last one..