@swagger-api/apidom-error

@swagger-api/apidom-error

apidom-error provides several error classes in support of Joyent's Best Practices for Error Handling in Node.js. These error classes should be used as a superclass for all operational errors. Operational errors represent run-time problems experienced by correctly-written programs.

Error classes from apidom-error handle complexities of extending native Error class and support error chaining in backward and forward compatible way.

Base errors

Base errors are meant to directly be thrown by ApiDOM code or to be extended to form custom error hierarchies.

ApiDOMError

Basic error class that can be easily extended and form error chains.

import { ApiDOMError } from '@swagger-api/apidom-error';

const error1 = new ApiDOMError('error message'); // basic error
const error2 = new ApiDOMError('error message', { cause: new Error('cause') }); // error chain

ApiDOMStructuredError

Error class that is based on ApiDOMError and allows to assign arbitrary data properties to its instances.

import { ApiDOMStructuredError } from '@swagger-api/apidom-error';

const error1 = new ApiDOMStructuredError('error message', { cause: new Error('cause') }); // just like ApiDOMError

const error2 = new ApiDOMStructuredError('error message', {
  prop1: 'value1',
  prop2: 3,
})
error2.prop1; // => 'value1'
error2.prop2; // => 3

Although structured error class gives convenience by assigning arbitrary properties it's highly recommended to extend ApiDOMStructuredError class and create public properties explicitly.

import { ApiDOMStructuredError, ApiDOMErrorOptions } from '@swagger-api/apidom-error';

interface StructuredErrorOptions extends ApiDOMErrorOptions {
  readonly prop1: string;
  readonly prop2: number;
}

class PropError extends ApiDOMStructuredError {
  public readonly  prop1: string;
  public readonly prop2: number;

  constructor(message?: string, options?: StructuredErrorOptions) {
    super(message, options)
    if (typeof options !== 'undefined') {
      this.prop1 = options.prop1;
      this.prop2 = options.prop2;
    }
  }
}

ApiDOMAggregateError

ApiDOMAggregateError can be easily extended and represents instance of an error when several errors need to be wrapped in a single error. It is thrown when multiple errors need to be reported by an operation. Supports error chaining as well.

import { ApiDOMAggregateError } from '@swagger-api/apidom-error';

const error1 = new Error('error1');
const error2 = new Error('error2');
const cause = new Error('optional cause');

const aggregateError = new ApiDOMAggregateError([error1, error2], 'aggregate error', {
  cause,
});

This class is based on native [AggregateError], and due to the fact that JavaScript classes don't support multiple inheritance, it cannot also be based on ApiDOMError. Nevertheless, for convenience, following will work:

import { ApiDOMAggregateError, ApiDOMError } from '@swagger-api/apidom-error';

const aggregateError = new ApiDOMAggregateError([]);
aggregateError instanceof ApiDOMError; // => true
aggregateError instanceof AggregateError; // => true

Generic custom errors

Generic custom errors represents custom errors that are generic enough to be used across ApiDOM monorepo packages and are not specific to any particular ApiDOM package.

UnsupportedOperationError

This error class that is based on ApiDOMError. Thrown to indicate that the requested operation is not supported.

import { UnsupportedOperationError } from '@swagger-api/apidom-error';

const error = new UnsupportedOperationError('error message');

NotImplementedError

Error class that is based on UnsupportedOperationError and. It is thrown to indicate that a block of code has not been implemented. This exception provides a more semantically rich description of the problem than base ApiDOMError.

import { NotImplementedError } from '@swagger-api/apidom-error';

const error = new NotImplementedError('error message');