WIP: Update npm packages to latest versions for 6.4 Beta 1

Gruntfile.js

@@ -171,6 +171,10 @@ module.exports = function(grunt) {
 			'webpack-assets': webpackFiles.map( function( file ) {
 				return setFilePath( WORKING_DIR, file );
 			} ),
+			'interactivity-assets': [
+				WORKING_DIR + 'wp-includes/js/dist/interactivity.asset.php',
+				WORKING_DIR + 'wp-includes/js/dist/interactivity.min.asset.php',
+			],
 			dynamic: {
 				dot: true,
 				expand: true,
@@ -1132,6 +1136,14 @@ module.exports = function(grunt) {
 							BUILD_DIR + 'wp-includes/js/dist/block-editor.js',
 						],
 						dest: BUILD_DIR + 'wp-includes/js/dist/'
+					},
+					{
+						expand: true,
+						flatten: true,
+						src: [
+							BUILD_DIR + 'wp-includes/js/dist/sync.js',
+						],
+						dest: BUILD_DIR + 'wp-includes/js/dist/'
 					}
 				]
 			}
@@ -1458,6 +1470,7 @@ module.exports = function(grunt) {
 		'clean:webpack-assets',
 		'webpack:prod',
 		'webpack:dev',
+		'clean:interactivity-assets',
 	] );
 
 	grunt.registerTask( 'build:js', [