standard-errors

js-standard-errors

This package contains a number of errors that I thought were missing in vanilla Javascript. There are currently just two errors in this package, but I plan to add more errors when I need one in a project.

All errors also have a unique code attribute to conform to the direction that the core Node.JS-team is taking with their errors. They also have a name attribute that matches their constructor name.

For example, new NotImplementedError() results in an error with the following attributes:

{
  "code": "ERR_NOT_IMPLEMENTED",
  "message": "Method is not implemented",
  "name": "NotImplementedError",
  "stack": "NotImplementedError: Method is not implemented
    at Object.<anonymous> (/path/to/your/file.js:1:1)
    at Module._compile (module.js:609:14)
    at Object.Module._extensions..js (module.js:623:10)
    at Module.load (module.js:531:32)
    at tryModuleLoad (module.js:494:12)
    at Function.Module._load (module.js:486:3)
    at Function.Module.runMain (module.js:653:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3"
}
 

Included errors

• ArgumentError (ERR_INVALID_ARGUMENT)
• NotImplementedError (ERR_NOT_IMPLEMENTED)

Implementing custom errors

The standard Javascript Error implementation is not that easy to extend using ES6 classes. That is why this package also exposes ExtendableError: an easy to extend ES6 class that wraps Error.

const { ExtendableError } = require('js-standard-errors');
 
class CustomError extends ExtendableError {
  constructor(message, options) {
    super(message || 'There was an error', 'ERR_CUSTOM_ERROR', options);
  }
}
 
module.exports = ArgumentError;