make-error

What is make-error?

The make-error package is a simple library for creating custom error types in JavaScript. It is useful for defining new error constructors that work similarly to native Error types, allowing for better error handling and debugging in applications.

What are make-error's main functionalities?

Creating custom error types

This feature allows developers to create their own error types that can be used throughout their codebase. The custom error types will inherit from the base Error class, making them compatible with standard error handling mechanisms.

const makeError = require('make-error');
const CustomError = makeError('CustomError');

throw new CustomError('This is a custom error message.');

Extending custom error types

Developers can also extend their custom error types to create a hierarchy of errors. This is useful for creating more specific error types that still share common behavior with their parent error types.

const makeError = require('make-error');
const BaseError = makeError('BaseError');
const SpecificError = makeError(BaseError);

throw new SpecificError('This is a more specific error message.');

Other packages similar to make-error

http-errors

The http-errors package allows for the creation of HTTP error objects. It is similar to make-error but is specifically tailored for HTTP server use, providing a list of constructors for various HTTP status codes.

verror

Verror is a library for richer JavaScript errors, which can include multiple error causes, formatted error messages, and other metadata. It offers more features compared to make-error, which is more minimalistic.

extendable-error

Extendable-error is a simple base class for creating extendable custom error classes in JavaScript. It is similar to make-error in its simplicity and focus on creating custom error types.

README

make-error

Make your own error types!

Features

• Compatible Node & browsers
• instanceof support
• error.name & error.stack support
• compatible with CSP (i.e. no eval())

Installation

Node & Browserify/Webpack

Installation of the npm package:

> npm install --save make-error

Then require the package:

var makeError = require("make-error");

Browser

You can directly use the build provided at unpkg.com:

<script src="https://unpkg.com/make-error@1/dist/make-error.js"></script>

Usage

Basic named error

var CustomError = makeError("CustomError");

// Parameters are forwarded to the super class (here Error).
throw new CustomError("a message");

Advanced error class

function CustomError(customValue) {
  CustomError.super.call(this, "custom error message");

  this.customValue = customValue;
}
makeError(CustomError);

// Feel free to extend the prototype.
CustomError.prototype.myMethod = function CustomError$myMethod() {
  console.log("CustomError.myMethod (%s, %s)", this.code, this.message);
};

//-----

try {
  throw new CustomError(42);
} catch (error) {
  error.myMethod();
}

Specialized error

var SpecializedError = makeError("SpecializedError", CustomError);

throw new SpecializedError(42);

Inheritance

Best for ES2015+.

import { BaseError } from "make-error";

class CustomError extends BaseError {
  constructor() {
    super("custom error message");
  }
}

Related

• make-error-cause: Make your own error types, with a cause!

Contributions

Contributions are very welcomed, either on the documentation or on the code.

You may:

• report any issue you've encountered;
• fork and create a pull request.

License

ISC © Julien Fontanet