parcel-bundler/lib/utils/customErrors.js

<p align="center"> <a href="https://parceljs.org/" target="_blank"> <img alt="Parcel" src="https://user-images.githubusercontent.com/19409/31321658-f6aed0f2-ac3d-11e7-8100-1587e676e0ec.png" width="749"> </a> </p>

"use strict";

let serverErrorList = {
  EACCES: "You don't have access to bind the server to port {port}.",
  EADDRINUSE: 'There is already a process listening on port {port}.'
};

function serverErrors(err, port) {
  let desc = serverErrorList[err.code].replace(/{port}/g, port);
  if (!desc) {
    desc = `Error: ${err.code} occurred while setting up server on port ${port}.`;
  }
  return desc;
}

module.exports.serverErrors = serverErrors;