Fixed unreliable hot reloading (#29)

* fix: unreliable hot reload

1. remove cwd option to yield absolute paths
2. add debounce to avoid multiple restarts happen unexpectedly when more than one file change

* refactor: use debounce package

lib/listening.js

@@ -1,5 +1,6 @@
 // Native
 const path = require('path')
+const debounce = require('debounce')
 
 // Packages
 const { write: copy } = require('clipboardy')
@@ -76,7 +77,6 @@ module.exports = async (server, inUse, flags, sockets) => {
     const watchConfig = {
       usePolling: flags.poll,
       ignoreInitial: true,
-      cwd: process.cwd(),
       ignored: [
         /\.git|node_modules|\.nyc_output|\.sass-cache|coverage/,
         /\.swp$/
@@ -102,21 +102,24 @@ module.exports = async (server, inUse, flags, sockets) => {
     const watcher = watch(toWatch, watchConfig)
 
     // Ensure that the server gets restarted if a file changes
-    watcher.on('all', (event, filePath) => {
-      const location = path.relative(process.cwd(), filePath)
+    watcher.on(
+      'all',
+      debounce((event, filePath) => {
+        const location = path.relative(process.cwd(), filePath)
 
-      console.log(
-        `\n${chalk.blue('File changed:')} ${location} - Restarting server...`
-      )
+        console.log(
+          `\n${chalk.blue('File changed:')} ${location} - Restarting server...`
+        )
 
-      destroySockets(sockets)
+        destroySockets(sockets)
 
-      // Ensure the same port when restarting server
-      flags.port = details.port
+        // Ensure the same port when restarting server
+        flags.port = details.port
 
-      // Restart server
-      server.close(restartServer.bind(this, file, flags, watcher))
-    })
+        // Restart server
+        server.close(restartServer.bind(this, file, flags, watcher))
+      }, 10)
+    )
   }
 
   if (flags.restarted) {

package.json

@@ -43,6 +43,7 @@
     "chalk": "2.1.0",
     "chokidar": "1.7.0",
     "clipboardy": "1.1.4",
+    "debounce": "1.0.2",
     "get-port": "3.1.0",
     "ip": "1.1.5",
     "jsome": "2.3.26",