From 2d5d2515be86496a280d93847185ab332e5d47a2 Mon Sep 17 00:00:00 2001
From: Brandy Carney <brandyscarney@users.noreply.github.com>
Date: Mon, 16 Mar 2020 17:36:58 -0400
Subject: [PATCH] fix(slides): check that mutation observer is defined for ssr
 (#20791)

---
 core/src/components/slides/slides.tsx | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/core/src/components/slides/slides.tsx b/core/src/components/slides/slides.tsx
index 4159adfd19..d162c4371a 100644
--- a/core/src/components/slides/slides.tsx
+++ b/core/src/components/slides/slides.tsx
@@ -132,16 +132,19 @@ export class Slides implements ComponentInterface {
   @Event() ionSlideTouchEnd!: EventEmitter<void>;
 
   connectedCallback() {
-    const mut = this.mutationO = new MutationObserver(() => {
-      if (this.swiperReady) {
-        this.update();
-      }
-    });
-    mut.observe(this.el, {
-      childList: true,
-      subtree: true
-    });
-    this.el.componentOnReady().then(() => this.initSwiper());
+    // tslint:disable-next-line: strict-type-predicates
+    if (typeof MutationObserver !== 'undefined') {
+      const mut = this.mutationO = new MutationObserver(() => {
+        if (this.swiperReady) {
+          this.update();
+        }
+      });
+      mut.observe(this.el, {
+        childList: true,
+        subtree: true
+      });
+      this.el.componentOnReady().then(() => this.initSwiper());
+    }
   }
 
   async disconnectedCallback() {