refactor: remove killable in favor of mehtod

lib/Server.js

@@ -7,7 +7,6 @@ const util = require("util");
 const fs = require("graceful-fs");
 const ipaddr = require("ipaddr.js");
 const internalIp = require("internal-ip");
-const killable = require("killable");
 const express = require("express");
 const { validate } = require("schema-utils");
 const schema = require("./options.json");
@@ -61,6 +60,31 @@ class Server {
     return /^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(URL);
   }
 
+  static killable(server) {
+    let sockets = [];
+
+    server.on("connection", (socket) => {
+      // add socket to list
+      sockets.push(socket);
+
+      socket.once("close", () => {
+        // remove socket from list
+        sockets.splice(sockets.indexOf(socket), 1);
+      });
+    });
+
+    server.kill = (cb) => {
+      server.close(cb);
+      sockets.forEach((socket) => {
+        socket.destroy();
+      });
+      // reset so the server can be restarted
+      sockets = [];
+    };
+
+    return server;
+  }
+
   static async getHostname(hostname) {
     if (hostname === "local-ip") {
       return (await internalIp.v4()) || (await internalIp.v6()) || "0.0.0.0";
@@ -682,7 +706,7 @@ class Server {
     this.setupFeatures();
     this.createServer();
 
-    killable(this.server);
+    Server.killable(this.server);
 
     if (this.options.setupExitSignals) {
       const signals = ["SIGINT", "SIGTERM"];

package.json

@@ -45,7 +45,6 @@
     "http-proxy-middleware": "^2.0.0",
     "internal-ip": "^6.2.0",
     "ipaddr.js": "^2.0.1",
-    "killable": "^1.0.1",
     "open": "^8.0.9",
     "p-retry": "^4.5.0",
     "portfinder": "^1.0.28",