Merge pull request #7411 from Brooooooklyn/issue/gulp-csso

fix import

gulp-csso/gulp-csso-tests.ts

@@ -1,8 +1,8 @@
 /// <reference path="gulp-csso.d.ts" />
 /// <reference path="../gulp/gulp.d.ts" />
 
-import gulp = require('gulp');
-import csso = require('gulp-csso');
+import * as gulp from 'gulp';
+import * as csso from 'gulp-csso';
 
 gulp.task('default', () =>
     gulp.src('./main.css')

gulp-csso/gulp-csso.d.ts

@@ -7,6 +7,6 @@
 
 declare module 'gulp-csso' {
     function csso(structureMinimization?: boolean): NodeJS.ReadWriteStream;
-
+    namespace csso {}
     export = csso;
 }