From 7efd6b5b5befbe76b3ad338fe211756e6aa8190b Mon Sep 17 00:00:00 2001
From: Henrik Giesel <hengiesel@gmail.com>
Date: Wed, 28 Apr 2021 21:39:26 +0200
Subject: [PATCH] Add deleteContext to Context API

Solves #6255
---
 src/runtime/internal/lifecycle.ts                |  6 +++++-
 test/runtime/samples/context-api-d/Delete.svelte |  8 ++++++++
 test/runtime/samples/context-api-d/Leaf.svelte   |  8 ++++++++
 test/runtime/samples/context-api-d/Nested.svelte |  7 +++++++
 test/runtime/samples/context-api-d/_config.js    |  7 +++++++
 test/runtime/samples/context-api-d/main.svelte   | 13 +++++++++++++
 6 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 test/runtime/samples/context-api-d/Delete.svelte
 create mode 100644 test/runtime/samples/context-api-d/Leaf.svelte
 create mode 100644 test/runtime/samples/context-api-d/Nested.svelte
 create mode 100644 test/runtime/samples/context-api-d/_config.js
 create mode 100644 test/runtime/samples/context-api-d/main.svelte

diff --git a/src/runtime/internal/lifecycle.ts b/src/runtime/internal/lifecycle.ts
index 002bd78d24..dbf93fa95e 100644
--- a/src/runtime/internal/lifecycle.ts
+++ b/src/runtime/internal/lifecycle.ts
@@ -55,7 +55,11 @@ export function getContext<T>(key): T {
 }
 
 export function hasContext(key): boolean {
-	return get_current_component().$$.context.has(key);	
+	return get_current_component().$$.context.has(key);
+}
+
+export function deleteContext(key): boolean {
+	return get_current_component().$$.context.delete(key);
 }
 
 // TODO figure out if we still want to support
diff --git a/test/runtime/samples/context-api-d/Delete.svelte b/test/runtime/samples/context-api-d/Delete.svelte
new file mode 100644
index 0000000000..9ae41e157c
--- /dev/null
+++ b/test/runtime/samples/context-api-d/Delete.svelte
@@ -0,0 +1,8 @@
+<script>
+	import { deleteContext } from 'svelte';
+
+	const deleted = deleteContext('test');
+</script>
+
+<div>{deleted}</div>
+<slot />
diff --git a/test/runtime/samples/context-api-d/Leaf.svelte b/test/runtime/samples/context-api-d/Leaf.svelte
new file mode 100644
index 0000000000..d03587659c
--- /dev/null
+++ b/test/runtime/samples/context-api-d/Leaf.svelte
@@ -0,0 +1,8 @@
+<script>
+	import { hasContext } from 'svelte';
+
+	const has = hasContext('test');
+</script>
+
+<div>{has}</div>
+<slot />
diff --git a/test/runtime/samples/context-api-d/Nested.svelte b/test/runtime/samples/context-api-d/Nested.svelte
new file mode 100644
index 0000000000..024169ff82
--- /dev/null
+++ b/test/runtime/samples/context-api-d/Nested.svelte
@@ -0,0 +1,7 @@
+<script>
+	import { setContext } from 'svelte';
+
+	setContext('test', true);
+</script>
+
+<slot></slot>
diff --git a/test/runtime/samples/context-api-d/_config.js b/test/runtime/samples/context-api-d/_config.js
new file mode 100644
index 0000000000..5dff100eed
--- /dev/null
+++ b/test/runtime/samples/context-api-d/_config.js
@@ -0,0 +1,7 @@
+export default {
+	html: `
+		<div>true</div>
+		<div>false</div>
+		<div>false</div>
+	`
+};
diff --git a/test/runtime/samples/context-api-d/main.svelte b/test/runtime/samples/context-api-d/main.svelte
new file mode 100644
index 0000000000..be6fda607e
--- /dev/null
+++ b/test/runtime/samples/context-api-d/main.svelte
@@ -0,0 +1,13 @@
+<script>
+  import Nested from "./Nested.svelte";
+  import Delete from "./Delete.svelte";
+  import Leaf from "./Leaf.svelte";
+</script>
+
+<Nested>
+	<Delete>
+		<Leaf>
+			<Delete />
+		</Leaf>
+	</Delete>
+</Nested>