From 87e2241928e5d14d24843fdd7a18efd8e50926fd Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Tue, 17 Jul 2018 14:11:07 -0400
Subject: [PATCH] null out refs to dynamic components - fixes #1596

---
 src/compile/nodes/Component.ts                |  2 ++
 .../dynamic-component-nulled-out/Foo.html     |  1 +
 .../dynamic-component-nulled-out/_config.js   | 21 +++++++++++++++++++
 .../dynamic-component-nulled-out/main.html    | 11 ++++++++++
 4 files changed, 35 insertions(+)
 create mode 100644 test/runtime/samples/dynamic-component-nulled-out/Foo.html
 create mode 100644 test/runtime/samples/dynamic-component-nulled-out/_config.js
 create mode 100644 test/runtime/samples/dynamic-component-nulled-out/main.html

diff --git a/src/compile/nodes/Component.ts b/src/compile/nodes/Component.ts
index 0f7cd57cb8..a659f5f5f3 100644
--- a/src/compile/nodes/Component.ts
+++ b/src/compile/nodes/Component.ts
@@ -429,6 +429,8 @@ export default class Component extends Node {
 						`)}
 
 						${this.ref && `#component.refs.${this.ref} = ${name};`}
+					} else {
+						${name} = null;
 					}
 
 					${this.ref && deindent`
diff --git a/test/runtime/samples/dynamic-component-nulled-out/Foo.html b/test/runtime/samples/dynamic-component-nulled-out/Foo.html
new file mode 100644
index 0000000000..c62ee08e19
--- /dev/null
+++ b/test/runtime/samples/dynamic-component-nulled-out/Foo.html
@@ -0,0 +1 @@
+<p>Foo</p>
\ No newline at end of file
diff --git a/test/runtime/samples/dynamic-component-nulled-out/_config.js b/test/runtime/samples/dynamic-component-nulled-out/_config.js
new file mode 100644
index 0000000000..17e51546ab
--- /dev/null
+++ b/test/runtime/samples/dynamic-component-nulled-out/_config.js
@@ -0,0 +1,21 @@
+export default {
+	html: `
+		<p>Foo</p>
+	`,
+
+	nestedTransitions: true,
+
+	test(assert, component, target) {
+		const state = component.get();
+
+		component.set({ Foo: null });
+
+		assert.htmlEqual(target.innerHTML, ``);
+
+		component.set({ Foo: state.Foo });
+
+		assert.htmlEqual(target.innerHTML, `
+			<p>Foo</p>
+		`);
+	}
+};
\ No newline at end of file
diff --git a/test/runtime/samples/dynamic-component-nulled-out/main.html b/test/runtime/samples/dynamic-component-nulled-out/main.html
new file mode 100644
index 0000000000..6a1a348557
--- /dev/null
+++ b/test/runtime/samples/dynamic-component-nulled-out/main.html
@@ -0,0 +1,11 @@
+<svelte:component this={Foo}/>
+
+<script>
+	import Foo from './Foo.html';
+
+	export default {
+		data() {
+			return { Foo };
+		}
+	};
+</script>
\ No newline at end of file