From c39a3f6d586e843ed24465dce00cc1ea66ddfd3a Mon Sep 17 00:00:00 2001
From: Conduitry <git@chor.date>
Date: Fri, 15 Mar 2019 18:30:08 -0400
Subject: [PATCH] skip non-writable vars in reactive declaration deps (#2173)

---
 src/compile/Component.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/compile/Component.ts b/src/compile/Component.ts
index 9dbfb3b41c..0a8fee5cf0 100644
--- a/src/compile/Component.ts
+++ b/src/compile/Component.ts
@@ -1034,7 +1034,10 @@ export default class Component {
 							if (!assignee_nodes.has(identifier)) {
 								const { name } = identifier;
 								const owner = scope.findOwner(name);
-								if ((!owner || owner === component.instance_scope) && (name[0] === '$' || component.var_lookup.has(name))) {
+								if (
+									(!owner || owner === component.instance_scope) &&
+									(name[0] === '$' || component.var_lookup.has(name) && component.var_lookup.get(name).writable)
+								) {
 									dependencies.add(name);
 								}
 							}