Here’s the article:
Metask error: impossible to use “Window.ethereum” in Angular
When you build an Ethereum-based application, one of the most essential libraries for Ethereum’s Blockchain interaction is Metask. However, when they use angular, developers often encounter an error that prevents their progress: unable to use “window.thereum”. In this article, we will deepen what this problem causes and give a step by step solution to solve it.
problem
Metask, developed by Coinbase, is a popular extension of the Ethereum browser. Allows users to interact with blockchain without leaving the web browser. To integrate Metask with an angular application, developers are based on Window.thereum, which offers a way to programmatically accessing the Ethereum blockchain.
However, when using angular, this approach often fails due to compatibility problems or security issues. The reason consists of how different frames and libraries with the browser environment interact. In particular, the angular addiction injection system and its use of the “window” variables can lead to conflicts with the implementation of Metask.
Solution
To solve this problem, we must change the way we access “Window.ethereum”. A solution is to create a personalized supplier that wraps metamark functionality in a more compatible manner. This approach involves the creation of a service or a separate module that offers a safe and safe way for angular applications to interact with Ethereum.
Here is an example of implementation:
`Typescript
Import {injectable} from ‘@angular/core’;
Import {Eters} from “Ethers”;
@Injectable ({
provided: “root”
})
EXPORT CLASS METASKPROVIDER {
Private EthereumProvider = New MetamanspageProvider ();
builder () {
this.etherumProvider.init ();
}
Get Ethereum (): Ethers.web3 {
returns this.
}
}
`
Using the decorator @@ injectable and creating a personalized supplier, we can safely access the window.
angular configuration
To usemetamarkprovider, you must configure angular to recognize the personalized supplier:
`Typescript
Import {ngmodule} from ‘@angular/core’;
Import {metamarkprovider} from ‘./metamark.provider’;
@Ngmodule ({
Suppliers: [
{
Provide: MetascinpageProvider,
Useclass: MetamuProvider
}
]
})
Export class Appmodule {}
“
Conclusion
Understanding the basic problems and implementing a personalized solution, developers can overcome the “window” error when used with metamark. This approach not only solves the compatibility problem, but also offers a safer way to interact with the Ethereum blockchain.
Remember to always follow the best practices for the development of web applications, including keeping up to date with the latest security measures and browser extensions. Happy coding!