[feat] add deleteContext

src/runtime/index.ts

@@ -9,6 +9,7 @@ export {
 	getContext,
 	getAllContexts,
 	hasContext,
+	deleteContext,
 	tick,
 	createEventDispatcher,
 	SvelteComponentDev as SvelteComponent,

src/runtime/internal/lifecycle.ts

@@ -62,6 +62,10 @@ export function hasContext(key): boolean {
 	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
 // shorthand events, or if we want to implement
 // a real bubbling mechanism

test/runtime/samples/context-api-e/Delete.svelte

@@ -0,0 +1,7 @@
+<script>
+	import { deleteContext } from 'svelte';
+	const deleted = deleteContext('test');
+</script>
+
+<div>{deleted}</div>
+<slot />

test/runtime/samples/context-api-e/Leaf.svelte

@@ -0,0 +1,7 @@
+<script>
+	import { hasContext } from 'svelte';
+	const has = hasContext('test');
+</script>
+
+<div>{has}</div>
+<slot />

test/runtime/samples/context-api-e/Nested.svelte

@@ -0,0 +1,6 @@
+<script>
+	import { setContext } from 'svelte';
+	setContext('test', true);
+</script>
+
+<slot />

test/runtime/samples/context-api-e/_config.js

@@ -0,0 +1,7 @@
+export default {
+	html: `
+		<div>true</div>
+		<div>false</div>
+		<div>false</div>
+	`
+};

test/runtime/samples/context-api-e/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>