From bb6a1b6c679ff9ad09795496b9a37b85b591ba2d Mon Sep 17 00:00:00 2001
From: Tan Li Hau <lhtan93@gmail.com>
Date: Sat, 8 Aug 2020 14:01:23 +0800
Subject: [PATCH] fix #5427 - do not declare variable for member assignment in
 reactive declaration

---
 src/compiler/compile/render_ssr/index.ts                    | 6 ++++--
 .../samples/reactive-value-assign-property/_config.js       | 5 +++++
 .../samples/reactive-value-assign-property/main.svelte      | 6 ++++++
 3 files changed, 15 insertions(+), 2 deletions(-)
 create mode 100644 test/runtime/samples/reactive-value-assign-property/_config.js
 create mode 100644 test/runtime/samples/reactive-value-assign-property/main.svelte

diff --git a/src/compiler/compile/render_ssr/index.ts b/src/compiler/compile/render_ssr/index.ts
index c87fe3bdd92b..ff6db2b13a01 100644
--- a/src/compiler/compile/render_ssr/index.ts
+++ b/src/compiler/compile/render_ssr/index.ts
@@ -99,8 +99,10 @@ export default function ssr(
 					? b`
 						${injected.map(name => b`let ${name};`)}
 						${statement}`
-					: b`
-						let ${left} = ${right}`;
+					: left.type === "Identifier"
+					? b`
+						let ${left} = ${right}`
+					: b`${left} = ${right}`;
 			}
 		} else { // TODO do not add label if it's not referenced
 			statement = b`$: { ${statement} }`;
diff --git a/test/runtime/samples/reactive-value-assign-property/_config.js b/test/runtime/samples/reactive-value-assign-property/_config.js
new file mode 100644
index 000000000000..7b6c1d296559
--- /dev/null
+++ b/test/runtime/samples/reactive-value-assign-property/_config.js
@@ -0,0 +1,5 @@
+export default {
+	html: `
+		<h1>Hello world!</h1>
+	`,
+};
diff --git a/test/runtime/samples/reactive-value-assign-property/main.svelte b/test/runtime/samples/reactive-value-assign-property/main.svelte
new file mode 100644
index 000000000000..58e0fdb03c39
--- /dev/null
+++ b/test/runtime/samples/reactive-value-assign-property/main.svelte
@@ -0,0 +1,6 @@
+<script>
+	$: user = {};
+	$: user.name = 'world';
+</script>
+
+<h1>Hello {user.name}!</h1>
\ No newline at end of file