make-error

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

Similar packages

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.