diff --git a/src/main.js b/src/main.js
index 875b93b..e49e42e 100644
--- a/src/main.js
+++ b/src/main.js
@@ -2,6 +2,9 @@
 // global/public, for debugging/testing purposes
 /*exported RGBDR_anim*/
 const RGBDR_anim = (() => {
+	let _ = 0
+	_ = ''
+
 	const
 		/** Maximum `Uint8` */
 		MAX_U8 = 0xff,