abstract-error

AbtractError

abstract error class with error code supports to create error class quickly.

Classes

AbstractError

All Errors are derived from the AbstractError.

import { AbstractError, createErrorClass } from 'abstract-error'

• Members:
  • message: the error message.
  • code: the error code.
• Class Methods:
  • createErrorClass(aType: string, aErrorCode: number, ParentErrorClass=AbstractError): typeof AbstractError

CommonError

import { CommonError } from 'abstract-error'

CommonError derived from the AbstractError. All Common Errors are derived from the CommonError. The CommonError use the number as error code.

• Members:
  • message: the error message.
  • code: the error code.
• Methods: return true if the error instance is this error type.
  • ok()
  • notFound()
  • ....
  • invalidFormat()
• Class Methods:
  • createErrorClass(aType: string, aErrorCode?: number, ParentErrorClass=CommonError): typeof CommonError
  • CommonError.isOk(err)
  • CommonError.isNotFound(err)
  • ...

the error codes:

• CommonError.Ok = 0
• CommonError.NotFound = 1
• CommonError.Corruption = 2
• CommonError.NotSupported = 3
• CommonError.InvalidArgument = 4
• CommonError.IO = 5
• CommonError.NotOpened = 6
• CommonError.InvalidType = 7
• CommonError.InvalidFormat = 8

Other Error Classes

• Errors.NotFoundError
• Errors.CorruptionError
• Errors.NotSupportedError/NotImplementedError
• Errors.InvalidArgumentError
• Errors.IOError
• Errors.NotOpenedError
• Errors.InvalidTypeError
• Errors.InvalidFormatError

Extends the AbstractError

use the createErrorClass function can extend the AbstractError.

createErrorClass(typeName, errorCode?: number|string, parentErrorClass?: typeof AbstractError): typeof AbstractError

arguments

• typeName (string): the error type name, the first character must be upper case.
• errorCode: (number|string): the optional error code, it should be not equal 0 if it's a number.
• parentErrorClass: (class): the optional parent error class. defaults to AbstractError.

return

• the new error class

Usage

import {CommonError, Errors, createCommonErrorClass} from 'abstract-error';

const NotFoundError = Errors.NotFoundError
const AlreadyReadError = createCommonErrorClass('AlreadyRead', 10000)

const err = new AlreadyReadError('already read over error.')

assert.ok(CommonError.isAlreadyRead(err))
assert.ok(AlreadyReadError.isAlreadyRead(err))
assert.ok(err.alreadyRead())
assert.equal(err.message, 'already read over error.')
assert.equal(err.code, 10000)