Upgrade copy-resources for gulp 4.

npm/packs/aspnetcore.mvc.ui/gulp/copy-resources.js

@@ -2,18 +2,16 @@
 
 (function () {
 
-    var taskName = 'aspnetcore.mvc.ui.copy-resources';
-
     var gulp = require("gulp"),
         merge = require("merge-stream"),
         rimraf = require("rimraf"),
         path = require("path"),
         extendObject = require('extend-object');
 
-    function init(rootPath) {
     var investigatedPackagePaths = {};
 
-        var resourceMapping = normalizeResourceMapping(buildResourceMapping(rootPath));
+    var resourceMapping;
+    var rootPath;
 
     function replaceAliases(text) {
         if (!resourceMapping.aliases) {
@@ -110,8 +108,10 @@
         return resourcemapping;
     }
 
-        gulp.task(taskName,
-            function () {
+    function copyResourcesTask (path) {
+        rootPath = path;
+        resourceMapping = normalizeResourceMapping(buildResourceMapping(rootPath));
+    
         cleanFiles();
 
         var tasks = [];
@@ -129,11 +129,8 @@
         }
 
         return merge(tasks);
-            });
     }
 
-    module.exports = {
-        taskName: taskName,
-        init: init
-    };
+    module.exports = copyResourcesTask;
+    
 })();