Description

Builds upon the extendable-error package and exposes a more sophisticated class GenericError with some usable classes

OBS

This is guaranteed not according to the theory of computer science. It has more of a practical purpose.

This package extends the native Error object with the functions

• toObject(),
• has()
• toString()
• getChildErrorObject()

Usage

Create new error

import { GenericError } from '@schlagerkhan/generic-error';

let genericError = new GenericError();

Extend error

class NetworkError extends GenericError {}

let networkError = new NetworkError();

instanceof vs .has()

class TestError extends GenericError {}

const genericError = new GenericError();
const secondError = new TestError();
const thirdError = new TestError(genericError);

// instanceof

genericError instanceof GenericError; // true
secondError instanceof GenericError; // true
thirdError instanceof GenericError; // true

genericError instanceof TestError; // false
secondError instanceof TestError; // true
thirdError instanceof TestError; // true

// has
genericError.has(GenericError); // true
secondError.has(GenericError); /// false
thirdError.has(GenericError); // true

genericError.has(TestError); // false
secondError.has(TestError); // true
thirdError.has(TestError); // true

API

Constructor

constructor(message?: string, meta: object, childError: GenericError) {}

Instance variables

- message: String
- meta: Object
- childError: Error | GenericError

Instance functions

- toString(): string
- toObject(): string
- has(errorClass: Error | GenericError): boolean
    // Checks if the instance is itself or has children that is an instance of errorClass
- getChildErrorObject(): ChildErrorObject
    // If childError exists it returns childError.getObject()

Connected projects

@schlagerkhan/errors