From 6ea898ec57c996ddea665a41be600858d9dab322 Mon Sep 17 00:00:00 2001
From: Robert Heim <robert@robert-heim.de>
Date: Thu, 5 Dec 2019 03:15:38 +0100
Subject: [PATCH] omit `gtm_preview` if not in preview mode

fixes #48
---
 src/Snippets.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Snippets.js b/src/Snippets.js
index b798e3db..a58c6593 100644
--- a/src/Snippets.js
+++ b/src/Snippets.js
@@ -5,7 +5,7 @@ import warn from './utils/warn'
 const Snippets = {
   tags: function ({ id, events, dataLayer, dataLayerName, preview, auth }) {
     const gtm_auth = `&gtm_auth=${auth}`
-    const gtm_preview = `&gtm_preview=${preview}`
+    const gtm_preview = !preview ? '' : `&gtm_preview=${preview}`
 
     if (!id) warn('GTM Id is required')