Change arg check from truthy to defined (#3143)

Show log on master when using cluster

src/cli/parse-server.js

@@ -9,7 +9,7 @@ import runner from './utils/runner';
 const help = function(){
   console.log('  Get Started guide:');
   console.log('');
-  console.log('    Please have a look at the get started guide!')
+  console.log('    Please have a look at the get started guide!');
   console.log('    https://github.com/ParsePlatform/parse-server/wiki/Parse-Server-Guide');
   console.log('');
   console.log('');
@@ -35,7 +35,7 @@ function startServer(options, callback) {
 
   app.use(options.mountPath, api);
 
-  var server = app.listen(options.port, callback);
+  let server = app.listen(options.port, callback);
   server.on('connection', initializeConnections);
 
   if (options.startLiveQueryServer || options.liveQueryServerOptions) {
@@ -69,7 +69,7 @@ function startServer(options, callback) {
     }
   }
 
-  var handleShutdown = function() {
+  let handleShutdown = function() {
     console.log('Termination signal received. Shutting down.');
     destroyAliveConnections();
     server.close(function () {
@@ -112,7 +112,8 @@ runner({
     if (options.cluster) {
       const numCPUs = typeof options.cluster === 'number' ? options.cluster : os.cpus().length;
       if (cluster.isMaster) {
-        for(var i = 0; i < numCPUs; i++) {
+        logOptions();
+        for(let i = 0; i < numCPUs; i++) {
           cluster.fork();
         }
         cluster.on('exit', (worker, code) => {
@@ -132,6 +133,6 @@ runner({
       });
     }
   }
-})
+});
 
 /* eslint-enable no-console */

src/cli/utils/commander.js

@@ -47,7 +47,7 @@ Command.prototype.loadDefinitions = function(definitions) {
     });
     console.log('');
   });
-}
+};
 
 function parseEnvironment(env = {}) {
   return Object.keys(_reverseDefinitions).reduce((options, key) => {
@@ -86,7 +86,7 @@ function parseConfigFile(program) {
       if (action) {
         options[key] = action(value);
       }
-    })
+    });
     console.log(`Configuration loaded from ${jsonPath}`)
   }
   return options;
@@ -94,11 +94,11 @@ function parseConfigFile(program) {
 
 Command.prototype.setValuesIfNeeded = function(options) {
   Object.keys(options).forEach((key) => {
-    if (!this[key]) {
+    if (!this.hasOwnProperty(key)) {
       this[key] = options[key];
     }
   });
-}
+};
 
 Command.prototype._parse = Command.prototype.parse;
 
@@ -113,7 +113,7 @@ Command.prototype.parse = function(args, env) {
   this.setValuesIfNeeded(fromFile);
   // Last set the defaults
   this.setValuesIfNeeded(_defaults);
-}
+};
 
 Command.prototype.getOptions = function() {
   return Object.keys(_definitions).reduce((options, key) => {
@@ -122,7 +122,7 @@ Command.prototype.getOptions = function() {
     }
     return options;
   }, {});
-}
+};
 
 export default new Command();
 /* eslint-enable no-console */