Fixed interface Options

gulp-uglify/gulp-uglify-tests.ts

@@ -14,7 +14,7 @@ gulp.task('compress2', function() {
     var tsResult = gulp.src('lib/*.ts')
         .pipe(uglify({
             mangle: false,
-            preserverComments: "some",
+            preserveComments: "some",
             compress: false,
             output: {
                 max_line_len: 300

gulp-uglify/gulp-uglify.d.ts

@@ -32,7 +32,7 @@ declare module "gulp-uglify" {
              * some - Preserve comments that start with a bang (!) or include a Closure Compiler directive (@preserve, @license, @cc_on)
              * function - Specify your own comment preservation function. You will be passed the current node and the current comment and are expected to return either true or false.
              */
-            preserverComments?: string|((node: any, comment: UglifyJS.Tokenizer) => boolean);
+            preserveComments?: string|((node: any, comment: UglifyJS.Tokenizer) => boolean);
         }
     }