process: changed var to const in internal/process.js

PR-URL: #8614
Refs: nodejs/code-and-learn#56
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>

lib/internal/process.js

@@ -168,7 +168,7 @@ function setupKillAndExit() {
     }
 
     if (err) {
-      var errnoException = require('util')._errnoException;
+      const errnoException = require('util')._errnoException;
       throw errnoException(err, 'kill');
     }
 
@@ -180,7 +180,7 @@ function setupKillAndExit() {
 function setupSignalHandlers() {
   // Load events module in order to access prototype elements on process like
   // process.addListener.
-  var signalWraps = {};
+  const signalWraps = {};
 
   function isSignal(event) {
     return typeof event === 'string' &&
@@ -191,18 +191,18 @@ function setupSignalHandlers() {
   process.on('newListener', function(type, listener) {
     if (isSignal(type) &&
         !signalWraps.hasOwnProperty(type)) {
-      var Signal = process.binding('signal_wrap').Signal;
-      var wrap = new Signal();
+      const Signal = process.binding('signal_wrap').Signal;
+      const wrap = new Signal();
 
       wrap.unref();
 
       wrap.onsignal = function() { process.emit(type); };
 
-      var signum = lazyConstants()[type];
-      var err = wrap.start(signum);
+      const signum = lazyConstants()[type];
+      const err = wrap.start(signum);
       if (err) {
         wrap.close();
-        var errnoException = require('util')._errnoException;
+        const errnoException = require('util')._errnoException;
         throw errnoException(err, 'uv_signal_start');
       }
 
@@ -223,13 +223,13 @@ function setupChannel() {
   // If we were spawned with env NODE_CHANNEL_FD then load that up and
   // start parsing data from that stream.
   if (process.env.NODE_CHANNEL_FD) {
-    var fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
+    const fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
     assert(fd >= 0);
 
     // Make sure it's not accidentally inherited by child processes.
     delete process.env.NODE_CHANNEL_FD;
 
-    var cp = require('child_process');
+    const cp = require('child_process');
 
     // Load tcp_wrap to avoid situation where we might immediately receive
     // a message.
@@ -243,8 +243,8 @@ function setupChannel() {
 
 
 function setupRawDebug() {
-  var format = require('util').format;
-  var rawDebug = process._rawDebug;
+  const format = require('util').format;
+  const rawDebug = process._rawDebug;
   process._rawDebug = function() {
     rawDebug(format.apply(null, arguments));
   };