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