From 8ca9541391c972ad65974cdf2a05cd81c460a939 Mon Sep 17 00:00:00 2001
From: pushkine <pushkine.github@gmail.com>
Date: Sat, 16 Jan 2021 15:00:58 +0100
Subject: [PATCH] init

---
 .../render_dom/wrappers/InlineComponent/index.ts       |  6 ++++--
 .../Component.svelte                                   |  5 +++++
 .../_config.js                                         |  5 +++++
 .../main.svelte                                        | 10 ++++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 test/runtime/samples/component-binding-reactive-property-no-extra-call/Component.svelte
 create mode 100644 test/runtime/samples/component-binding-reactive-property-no-extra-call/_config.js
 create mode 100644 test/runtime/samples/component-binding-reactive-property-no-extra-call/main.svelte

diff --git a/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts b/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts
index be3d6d146d..515cdc0841 100644
--- a/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts
+++ b/src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts
@@ -378,8 +378,10 @@ export default class InlineComponentWrapper extends Wrapper {
 
 			const body = b`
 				function ${id}(${params}) {
-					${lhs} = #value;
-					${renderer.invalidate(dependencies[0])};
+					if ($$self.$$.not_equal(${lhs}, #value)) {
+						${lhs} = #value;
+						${renderer.invalidate(dependencies[0])};
+					}
 				}
 			`;
 
diff --git a/test/runtime/samples/component-binding-reactive-property-no-extra-call/Component.svelte b/test/runtime/samples/component-binding-reactive-property-no-extra-call/Component.svelte
new file mode 100644
index 0000000000..35bea4786d
--- /dev/null
+++ b/test/runtime/samples/component-binding-reactive-property-no-extra-call/Component.svelte
@@ -0,0 +1,5 @@
+<script>
+	export let value;
+</script>
+
+{value}
diff --git a/test/runtime/samples/component-binding-reactive-property-no-extra-call/_config.js b/test/runtime/samples/component-binding-reactive-property-no-extra-call/_config.js
new file mode 100644
index 0000000000..ae7b55e100
--- /dev/null
+++ b/test/runtime/samples/component-binding-reactive-property-no-extra-call/_config.js
@@ -0,0 +1,5 @@
+export default {
+	async test({ assert, component }) {
+		assert.equal(component.object_updates, 1);
+	},
+};
diff --git a/test/runtime/samples/component-binding-reactive-property-no-extra-call/main.svelte b/test/runtime/samples/component-binding-reactive-property-no-extra-call/main.svelte
new file mode 100644
index 0000000000..768f8c22a9
--- /dev/null
+++ b/test/runtime/samples/component-binding-reactive-property-no-extra-call/main.svelte
@@ -0,0 +1,10 @@
+<script>
+	import Component from "./Component.svelte";
+
+	export let object_updates = 0;
+
+	let arr = [""];
+	$: if (arr) object_updates++;
+</script>
+
+<Component bind:value={arr[0]} />