init

src/compiler/compile/render_dom/wrappers/InlineComponent/index.ts

@@ -378,9 +378,11 @@ export default class InlineComponentWrapper extends Wrapper {
 
 			const body = b`
 				function ${id}(${params}) {
+					if ($$self.$$.not_equal(${lhs}, #value)) {
 						${lhs} = #value;
 						${renderer.invalidate(dependencies[0])};
 					}
+				}
 			`;
 
 			component.partly_hoisted.push(body);

test/runtime/samples/component-binding-reactive-property-no-extra-call/Component.svelte

@@ -0,0 +1,5 @@
+<script>
+	export let value;
+</script>
+
+{value}

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);
+	},
+};

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]} />