i-am-error

Lets you easily create custom Error objects.

Install:

npm install i-am-error

Usage:

IAmError(name, attrs, args) - Creates a dynamically named constructor for an error that inherits from Error.

• name: Name for the new error's constructor (e.g. 'InvalidInputError')
• attrs: Attributes assigned to the new error when IAmError is called. Must be string, number or boolean.
• args: Attributes assigned to the new error when the new error is constructed. Names must be strings, args passed in can be anything.

Each error is automatically configured with a message attribute and a data attribute.

• message: A string detailing the error.
• data: An object containing arbitrary data.

Simple Example:

Create a MyError object:

const IAmError = require('i-am-error');
const MyError = IAmError('MyError');

and can be used like:

throw new MyError();
throw new MyError('Some message');
throw new MyError('Some message', { optional: 'data' });

A More Complex Example:

Create an AuthenticationError object with a status attribute set to 403 and a timestamp argument that can be passed into the error:

const IAmError = require('i-am-error');
const AuthenticationError = IAmError('AuthenticationError', { status: 403 }, [ 'timestamp' ])

and can be used like:

throw new AuthenticationError('Some message', new Date(), { optional: 'data' });