@juliancoleman/named-error

Named Error

A tiny library for creating custom errors for use with Bluebird's filtered catch

Example

import NamedError from "@juliancoleman/named-error";

// Instantiate with `new`
const NotFoundError = new NamedError(404, "Not found.");

This library is also particularly useful with APIs that use an ORM, such as ObjectionJS.

import Base from "./base";

import NamedError from "@juliancoleman/named-error";

export class UserNotFoundError extends NamedError { }

export default class User extends Base {
  static tableName = "users";
  static NotFoundError = new UserNotFoundError(404, "User not found.");

  // ...
}

And when we need to catch

import Service from "../services/some-service";
import NotFoundError from "../errors/not-found-error";

Service.getThatOneThing() // Returns a Bluebird promise
  .then(doSomethingWithReturnedData)
  .catch(TypeError, NotFoundError, function(e) {
    // Generic catch-all for unexpected errors
  });