diff --git a/gulpfile.js b/gulpfile.js
index 05918ab7bc6d..44a7f54f15fa 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -36,6 +36,11 @@ const all = [
     'src/client/**/*',
 ];
 
+const tsFilter = [
+    'src/**/*.ts',
+    'src/client/**/*.ts',
+];
+
 const indentationFilter = [
     'src/**/*.ts',
     '!**/typings/**/*',
@@ -68,7 +73,7 @@ gulp.task('compile', () => run({ mode: 'compile', skipFormatCheck: true, skipInd
 
 gulp.task('watch', ['hygiene-modified', 'hygiene-watch']);
 
-gulp.task('hygiene-watch', () => gulp.watch(all, debounce(() => run({ mode: 'changes' }), 1000)));
+gulp.task('hygiene-watch', () => gulp.watch(tsFilter, debounce(() => run({ mode: 'changes' }), 1000)));
 
 gulp.task('hygiene-all', () => run({ mode: 'all' }));
 
diff --git a/news/3 Code Health/1040.md b/news/3 Code Health/1040.md
new file mode 100644
index 000000000000..88e881779fbd
--- /dev/null
+++ b/news/3 Code Health/1040.md	
@@ -0,0 +1 @@
+Trigger incremental build compilation only when typescript files are modified.