From d122a6f89362e33ff7e28627dcfaf23536557d84 Mon Sep 17 00:00:00 2001
From: Conduitry <git@chor.date>
Date: Wed, 1 May 2019 01:43:44 -0400
Subject: [PATCH 1/2] fix determining which variables are initialised (#2635)

---
 src/compile/utils/scope.ts | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/compile/utils/scope.ts b/src/compile/utils/scope.ts
index 20cca46cba..6488986d83 100644
--- a/src/compile/utils/scope.ts
+++ b/src/compile/utils/scope.ts
@@ -75,12 +75,10 @@ export class Scope {
 		if (node.kind === 'var' && this.block && this.parent) {
 			this.parent.add_declaration(node);
 		} else if (node.type === 'VariableDeclaration') {
-			const initialised = !!node.init;
-
 			node.declarations.forEach((declarator: Node) => {
 				extract_names(declarator.id).forEach(name => {
 					this.declarations.set(name, node);
-					if (initialised) this.initialised_declarations.add(name);
+					if (declarator.init) this.initialised_declarations.add(name);
 				});
 			});
 		} else {

From 8bfb5b7f332224bd091be1be574e7eeb6d1901d9 Mon Sep 17 00:00:00 2001
From: Conduitry <git@chor.date>
Date: Wed, 1 May 2019 08:12:33 -0400
Subject: [PATCH 2/2] update tests

---
 .../runtime/samples/dev-warning-missing-data-binding/main.svelte | 1 +
 .../samples/dev-warning-missing-data-component/Foo.svelte        | 1 +
 2 files changed, 2 insertions(+)

diff --git a/test/runtime/samples/dev-warning-missing-data-binding/main.svelte b/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
index 3714351783..cfc7830c90 100644
--- a/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
+++ b/test/runtime/samples/dev-warning-missing-data-binding/main.svelte
@@ -1,5 +1,6 @@
 <script>
 	export let value;
+	export let value_with_default = undefined;
 </script>
 
 <input bind:value>
\ No newline at end of file
diff --git a/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte b/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
index 95422444cc..99e26245ae 100644
--- a/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
+++ b/test/runtime/samples/dev-warning-missing-data-component/Foo.svelte
@@ -1,6 +1,7 @@
 <script>
 	export let x;
 	export let y;
+	export let z = undefined;
 </script>
 
 <div>{x} {y}</div>
\ No newline at end of file