Fix My Mistake

Tools/Gulp/gulpfile.js

@@ -33,7 +33,6 @@ var karmaServer = require('karma').Server;
 var gulpTslint = require("gulp-tslint");
 var tslint = require("tslint");
 const filter = require('gulp-filter');
-const dtsFilter = filter(['**', '!**/*.d.ts'], {restore: false});
 
 //viewer declaration
 var processDeclaration = require('./processViewerDeclaration');
@@ -274,6 +273,7 @@ gulp.task("build", gulp.series("shaders", function build() {
 * TsLint all typescript files from the src directory.
 */
 gulp.task("typescript-tsLint", function() {
+    const dtsFilter = filter(['**', '!**/*.d.ts'], {restore: false});
     return gulp.src(config.typescript)
         .pipe(dtsFilter)
         .pipe(gulpTslint({
@@ -347,6 +347,7 @@ gulp.task("tsLint", gulp.series("typescript-tsLint", "typescript-libraries-tsLin
 * Compiles all typescript files and creating a js and a declaration file.
 */
 gulp.task("typescript-compile", function() {
+    const dtsFilter = filter(['**', '!**/*.d.ts'], {restore: false});
     var tsResult = gulp.src(config.typescript)
         .pipe(dtsFilter)
         .pipe(sourcemaps.init())
@@ -883,6 +884,7 @@ gulp.task("netlify-cleanup", function() {
 
 // this is needed for the modules for the declaration files.
 gulp.task("modules-compile", function() {
+    const dtsFilter = filter(['**', '!**/*.d.ts'], {restore: false});
     var tsResult = gulp.src(config.typescript)
         .pipe(dtsFilter)
         .pipe(sourcemaps.init())