can-bind-to-host/dist/index.js

Utility package to see if the node process can bind to the host or listen on a port. Can be used for checking if a host resolves to localhost.

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.canBindToHost = void 0;
var net_1 = __importDefault(require("net"));
var canBindToHost = function (host, port) {
    if (host === void 0) { host = '0.0.0.0'; }
    if (port === void 0) { port = 0; }
    return new Promise(function (res) {
        if (port >= 0 && port <= 65535) {
            var server_1 = net_1.default
                .createServer()
                .listen({
                host: host,
                port: port,
            })
                .addListener('error', function () { return res(false); })
                .addListener('listening', function () {
                server_1.close();
                res(true);
            });
        }
        else
            res(false);
    });
};
exports.canBindToHost = canBindToHost;
exports.default = canBindToHost;