Fixed the short-name expansion

Author: cartant

lib/Tsifier.js

@@ -54,11 +54,11 @@ module.exports = function (ts) {
 	function parseOptions(opts, bopts) {
 
 		// Expand any short-name, command-line options
-		opts = Object.assign({
-			module: opts.m,
-			project: opts.p,
-			target: opts.t
-		}, opts);
+		var expanded = {};
+		if (opts.m) { expanded.module = opts.m; }
+		if (opts.p) { expanded.project = opts.p; }
+		if (opts.t) { expanded.target = opts.t; }
+		opts = Object.assign(expanded, opts);
 
 		var configFile;
 		if (fileExists(opts.project)) {