From 76b6a6ec1ff32db5d1ca87fec6dba13e7acb3595 Mon Sep 17 00:00:00 2001
From: Vadim Cebaniuc <vadimce@gmail.com>
Date: Sat, 13 Jul 2019 04:13:48 +0300
Subject: [PATCH] Remove null and undefined attributes

set_attributes() should delete `null` or `undefined` attributes.

I meet the issue for this case
```
<script>
	let size
</script>
<input type="text" { size } />
vs
<input type="text" { ...{ size } } />
```
---
 src/runtime/internal/dom.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/runtime/internal/dom.ts b/src/runtime/internal/dom.ts
index 452347dc29..89025c881c 100644
--- a/src/runtime/internal/dom.ts
+++ b/src/runtime/internal/dom.ts
@@ -100,7 +100,7 @@ export function set_attributes(node: Element & ElementCSSInlineStyle, attributes
 	for (const key in attributes) {
 		if (key === 'style') {
 			node.style.cssText = attributes[key];
-		} else if (key in node) {
+		} else if (key in node && attributes[key] != null) {
 			node[key] = attributes[key];
 		} else {
 			attr(node, key, attributes[key]);