Angular's custom error handler is failing to function as intended

Question

Angular's custom error handler is failing to function as intended

Currently, I am facing a challenge in implementing a custom error handler for my angular application. The issue seems to be working, but under some peculiar conditions only.

To view the implementation, you can check out the StackBlitz link provided below: https://stackblitz.com/edit/angular-mqvzba

Within the project, you will find a global-error-handler.service.ts file located inside the "app" folder, along with the hello.component.ts file and other component files.

I have already included the handling directive in the providers section of the app.module.ts. Interestingly, when I test the newly created error before throwing it, it does appear to be an instance of CustomError.

My expectation is to achieve the desired result without needing to uncomment the setTimeout function.

Key files to review: - src/app/global-error-handler.service.ts - src/app/app.module.ts - src/app/hello.component.ts

angular typescript error-handling

Answer 1

Answer №1

When creating a CustomError class in TypeScript, it is important to ensure that it extends the built-in Error class. It is also necessary to set the object prototype for instanceof to function correctly when extending builtins. For more information, you can refer to this Custom error class in TypeScript.

export class CustomError extends Error {    
    button?: any
    errObject: any    
    constructor() {        
        super('custom');
        Object.setPrototypeOf(this, CustomError.prototype);
    }
}

By following these guidelines, you should be able to handle errors effectively.

Answer 2

When creating a CustomError class in TypeScript, it is important to ensure that it extends the built-in Error class. It is also necessary to set the object prototype for instanceof to function correctly when extending builtins. For more information, you can refer to this Custom error class in TypeScript.

export class CustomError extends Error {    
    button?: any
    errObject: any    
    constructor() {        
        super('custom');
        Object.setPrototypeOf(this, CustomError.prototype);
    }
}

By following these guidelines, you should be able to handle errors effectively.

Angular's custom error handler is failing to function as intended

Answer №1

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