Creating a TypeScript interface for the Ethereum Window object with a request method implementation

Question

Creating a TypeScript interface for the Ethereum Window object with a request method implementation

Currently, I have a function running that imports ethers from the "ethers" library.

import { ethers } from "ethers";

async function requestAccount() {
    await window.ethereum.request({ method: "eth_requestAccounts" });
}

The problem arises when using typescript as it shows an error message:

Property 'ethereum' does not exist on type 'Window & typeof globalThis'

To resolve this issue, I made the following adjustment:

declare global {
  interface Window{
    ethereum?:any
  }
}

However, I feel like this may not be the most efficient way to utilize typescript. How can I modify this so that the interface value is accurate? My understanding is that it should be an object with a method inside, but I am unsure of the correct syntax in typescript.

Any assistance would be greatly valued.

Thank you

javascript typescript ethereum metamask ethers.js

Answer 1

Answer №1

If you find yourself in need of an answer to this somewhat antiquated question, consider utilizing the ExternalProvider type within the ethers framework.

interface Window {
  ethereum?: import('ethers').providers.ExternalProvider;
}

In case you are not using ethers, here is a simplified version of the ExternalProvider:

type ExternalProvider = {
  isMetaMask?: boolean;
  isStatus?: boolean;
  host?: string;
  path?: string;
  sendAsync?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
  send?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
  request?: (request: { method: string, params?: Array<any> }) => Promise<any>
}

Answer 2

If you find yourself in need of an answer to this somewhat antiquated question, consider utilizing the ExternalProvider type within the ethers framework.

interface Window {
  ethereum?: import('ethers').providers.ExternalProvider;
}

In case you are not using ethers, here is a simplified version of the ExternalProvider:

type ExternalProvider = {
  isMetaMask?: boolean;
  isStatus?: boolean;
  host?: string;
  path?: string;
  sendAsync?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
  send?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
  request?: (request: { method: string, params?: Array<any> }) => Promise<any>
}

Answer 3

Answer №2

npm install @metamask/providers

Follow the steps below to add this package to your project:

import { MetaMaskInpageProvider } from "@metamask/providers";

declare global {
  interface Window{
    ethereum?:MetaMaskInpageProvider
  }
}

Next, use the code snippet below:

const accounts = (await ethereum?.request({
      method: "eth_requestAccounts",
    })) as string[];

Answer 4

npm install @metamask/providers

Follow the steps below to add this package to your project:

import { MetaMaskInpageProvider } from "@metamask/providers";

declare global {
  interface Window{
    ethereum?:MetaMaskInpageProvider
  }
}

Next, use the code snippet below:

const accounts = (await ethereum?.request({
      method: "eth_requestAccounts",
    })) as string[];

Answer 5

Answer №3

To temporarily resolve the Type Error issue, you can do the following:

Include the following code snippet at the top level after your imports: declare let window: any. This will allow you to call window.ethereum without receiving any warnings or Type Errors.

It's worth noting that this approach essentially overrides the global window object with a type of any, which may not be considered the best practice for resolving this issue. However, it serves as a quick fix until a more permanent solution is implemented. Please let me know if this solution works in your specific case.

Answer 6

To temporarily resolve the Type Error issue, you can do the following:

Include the following code snippet at the top level after your imports: declare let window: any. This will allow you to call window.ethereum without receiving any warnings or Type Errors.

It's worth noting that this approach essentially overrides the global window object with a type of any, which may not be considered the best practice for resolving this issue. However, it serves as a quick fix until a more permanent solution is implemented. Please let me know if this solution works in your specific case.

Creating a TypeScript interface for the Ethereum Window object with a request method implementation

Answer №1

Answer №2

Answer №3

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