From b7366c42cdfcf0498d669ed0d8599bbfff981015 Mon Sep 17 00:00:00 2001
From: Jonniek <kayhty@windowslive.com>
Date: Sat, 14 Mar 2020 19:36:13 +0200
Subject: [PATCH] fix ssr dropping bound value 0

Number 0 when used in the value of a binding was
ignored by the server side rendering.
---
 src/runtime/internal/ssr.ts                                 | 2 +-
 .../samples/bindings-zero/_expected.html                    | 2 ++
 .../server-side-rendering/samples/bindings-zero/main.svelte | 6 ++++++
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 test/server-side-rendering/samples/bindings-zero/_expected.html
 create mode 100644 test/server-side-rendering/samples/bindings-zero/main.svelte

diff --git a/src/runtime/internal/ssr.ts b/src/runtime/internal/ssr.ts
index 646a81d817..0e03afb0db 100644
--- a/src/runtime/internal/ssr.ts
+++ b/src/runtime/internal/ssr.ts
@@ -128,7 +128,7 @@ export function create_ssr_component(fn) {
 }
 
 export function add_attribute(name, value, boolean) {
-	if (value == null || (boolean && !value)) return '';
+	if (value == null || (boolean && !value && value !== 0)) return '';
 	return ` ${name}${value === true ? '' : `=${typeof value === 'string' ? JSON.stringify(escape(value)) : `"${value}"`}`}`;
 }
 
diff --git a/test/server-side-rendering/samples/bindings-zero/_expected.html b/test/server-side-rendering/samples/bindings-zero/_expected.html
new file mode 100644
index 0000000000..c243e358ff
--- /dev/null
+++ b/test/server-side-rendering/samples/bindings-zero/_expected.html
@@ -0,0 +1,2 @@
+<input value='0' type='number'>
+<input value='0' type='range'>
\ No newline at end of file
diff --git a/test/server-side-rendering/samples/bindings-zero/main.svelte b/test/server-side-rendering/samples/bindings-zero/main.svelte
new file mode 100644
index 0000000000..6b4c606b13
--- /dev/null
+++ b/test/server-side-rendering/samples/bindings-zero/main.svelte
@@ -0,0 +1,6 @@
+<script>
+	export let zero = 0;
+</script>
+
+<input bind:value={zero} type="number">
+<input bind:value={zero} type="range">