From d7215443bb1414396ba3c35a42cb3e5dcf5cece0 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Fri, 23 Nov 2018 20:21:29 -0500
Subject: [PATCH] prevent double declarations

---
 src/compile/Component.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/compile/Component.ts b/src/compile/Component.ts
index b772d74c6f..6c8394871d 100644
--- a/src/compile/Component.ts
+++ b/src/compile/Component.ts
@@ -130,10 +130,11 @@ export default class Component {
 		this.stylesheet.warnOnUnusedSelectors(options.onwarn);
 
 		if (!this.ast.js) {
-			this.declarations.push(...this.expectedProperties);
+			const props = [...this.expectedProperties];
+			this.declarations.push(...props);
 			addToSet(this.writable_declarations, this.expectedProperties);
 
-			this.exports = this.declarations.map(name => ({
+			this.exports = props.map(name => ({
 				name,
 				as: name
 			}));