Ignoring Discord.js errors that are expected and ignoreable

ignore-errors.js

const { Constants: { APIErrors }} = require('discord.js');
const errorCodes = new Set(Object.values(APIErrors));

/**
 * Usage:
 * const {APIErrors: {CANNOT_MESSAGE_USER}, ignore} = require('./ignore-errors.js');
 * try {
 *   let message = await user.send('Hello world').catch(ignore(CANNOT_MESSAGE_USER));
 *   if (message === null) {
 *     // User has DMs closed
 *   } else {
 *     // Message was sent!
 *   }
 * } catch (e) {
 *   // Real error happened! O no!
 * }
 */

module.exports.APIErrors = APIErrors;
module.exports.ignore = (...errors) => {
  if (errors.find(error => !errorCodes.has(error))) {
    throw new Error('Cannot ignore unknown error. Please check your error')
  }
  let ignore = new Set(errors);
  return error => {
    if (!errors.has(error)) {
        throw error;
    }
    return null;
  };
};