repair dynamic {@html} in head

src/compile/render-dom/Block.ts

@@ -164,7 +164,7 @@ export default class Block {
 
 		if (parent_node) {
 			this.builders.mount.add_line(`@append(${parent_node}, ${name});`);
-			if (parent_node === 'document.head') this.builders.destroy.add_line(`@detach(${name});`);
+			if (parent_node === 'document.head' && !no_detach) this.builders.destroy.add_line(`@detach(${name});`);
 		} else {
 			this.builders.mount.add_line(`@insert(#target, ${name}, anchor);`);
 			if (!no_detach) this.builders.destroy.add_conditional('detaching', `@detach(${name});`);

src/compile/render-dom/wrappers/Head.ts

@@ -30,6 +30,6 @@ export default class HeadWrapper extends Wrapper {
 	}
 
 	render(block: Block, parent_node: string, parent_nodes: string) {
-		this.fragment.render(block, 'document.head', null);
+		this.fragment.render(block, 'document.head', 'nodes');
 	}
-}
+}

src/compile/render-dom/wrappers/IfBlock.ts

@@ -154,16 +154,18 @@ export default class IfBlockWrapper extends Wrapper {
 
 		const vars = { name, anchor, if_name, has_else, has_transitions };
 
+		const detaching = (parent_node && parent_node !== 'document.head') ? '' : 'detaching';
+
 		if (this.node.else) {
 			if (has_outros) {
-				this.render_compound_with_outros(block, parent_node, parent_nodes, dynamic, vars);
+				this.render_compound_with_outros(block, parent_node, parent_nodes, dynamic, vars, detaching);
 
 				block.builders.outro.add_line(`if (${name}) ${name}.o();`);
 			} else {
-				this.render_compound(block, parent_node, parent_nodes, dynamic, vars);
+				this.render_compound(block, parent_node, parent_nodes, dynamic, vars, detaching);
 			}
 		} else {
-			this.render_simple(block, parent_node, parent_nodes, dynamic, vars);
+			this.render_simple(block, parent_node, parent_nodes, dynamic, vars, detaching);
 
 			if (has_outros) {
 				block.builders.outro.add_line(`if (${name}) ${name}.o();`);
@@ -201,7 +203,8 @@ export default class IfBlockWrapper extends Wrapper {
 		parent_node: string,
 		parent_nodes: string,
 		dynamic,
-		{ name, anchor, has_else, if_name, has_transitions }
+		{ name, anchor, has_else, if_name, has_transitions },
+		detaching
 	) {
 		const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
 		const current_block_type = block.get_unique_name(`current_block_type`);
@@ -254,7 +257,7 @@ export default class IfBlockWrapper extends Wrapper {
 			`);
 		}
 
-		block.builders.destroy.add_line(`${if_name}${name}.d(${parent_node ? '' : 'detaching'});`);
+		block.builders.destroy.add_line(`${if_name}${name}.d(${detaching});`);
 	}
 
 	// if any of the siblings have outros, we need to keep references to the blocks
@@ -264,7 +267,8 @@ export default class IfBlockWrapper extends Wrapper {
 		parent_node: string,
 		parent_nodes: string,
 		dynamic,
-		{ name, anchor, has_else, has_transitions }
+		{ name, anchor, has_else, has_transitions },
+		detaching
 	) {
 		const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
 		const current_block_type_index = block.get_unique_name(`current_block_type_index`);
@@ -375,7 +379,7 @@ export default class IfBlockWrapper extends Wrapper {
 		}
 
 		block.builders.destroy.add_line(deindent`
-			${if_current_block_type_index}${if_blocks}[${current_block_type_index}].d(${parent_node ? '' : 'detaching'});
+			${if_current_block_type_index}${if_blocks}[${current_block_type_index}].d(${detaching});
 		`);
 	}
 
@@ -384,7 +388,8 @@ export default class IfBlockWrapper extends Wrapper {
 		parent_node: string,
 		parent_nodes: string,
 		dynamic,
-		{ name, anchor, if_name, has_transitions }
+		{ name, anchor, if_name, has_transitions },
+		detaching
 	) {
 		const branch = this.branches[0];
 
@@ -450,6 +455,6 @@ export default class IfBlockWrapper extends Wrapper {
 			}
 		`);
 
-		block.builders.destroy.add_line(`${if_name}${name}.d(${parent_node ? '' : 'detaching'});`);
+		block.builders.destroy.add_line(`${if_name}${name}.d(${detaching});`);
 	}
-}
+}

src/compile/render-dom/wrappers/RawMustacheTag.ts

@@ -21,9 +21,18 @@ export default class RawMustacheTagWrapper extends Tag {
 	render(block: Block, parent_node: string, parent_nodes: string) {
 		const name = this.var;
 
+		const in_head = parent_node === 'document.head';
+		const needs_anchors = !parent_node || in_head;
+
+		// if in head always needs anchors
+		if (in_head) {
+			this.prev = null;
+			this.next = null;
+		}
+
 		// TODO use is_dom_node instead of type === 'Element'?
-		const needs_anchor_before = this.prev ? this.prev.node.type !== 'Element' : !parent_node;
-		const needs_anchor_after = this.next ? this.next.node.type !== 'Element' : !parent_node;
+		const needs_anchor_before = this.prev ? this.prev.node.type !== 'Element' : needs_anchors;
+		const needs_anchor_after = this.next ? this.next.node.type !== 'Element' : needs_anchors;
 
 		const anchor_before = needs_anchor_before
 			? block.get_unique_name(`${name}_before`)
@@ -89,7 +98,7 @@ export default class RawMustacheTagWrapper extends Tag {
 
 		block.builders.mount.add_line(insert(init));
 
-		if (!parent_node) {
+		if (needs_anchors) {
 			block.builders.destroy.add_conditional('detaching', needs_anchor_before
 				? `${detach}\n@detach(${anchor_before});`
 				: detach);
@@ -100,4 +109,4 @@ export default class RawMustacheTagWrapper extends Tag {
 			add_anchor_after();
 		}
 	}
-}
+}

test/runtime/samples/head-if-block/_config.js

@@ -9,4 +9,4 @@ export default {
 		component.condition = true;
 		assert.equal(window.document.title, 'woo!!!');
 	}
-};
+};

test/runtime/samples/head-if-block/main.svelte

@@ -6,4 +6,4 @@
 	{#if condition}
 		<title>woo!!!</title>
 	{/if}
-</svelte:head>
+</svelte:head>

test/runtime/samples/head-if-else-block/_config.js

@@ -0,0 +1,14 @@
+export default {
+	props: {
+		condition: false
+	},
+
+	test({ assert, component, target, window }) {
+		assert.equal(window.document.title, '');
+		assert.equal(Boolean(window.document.getElementById('meta')), true);
+
+		component.condition = true;
+		assert.equal(window.document.title, 'woo!!!');
+		assert.equal(window.document.getElementById('meta'), null);
+	}
+};

test/runtime/samples/head-if-else-block/main.svelte

@@ -0,0 +1,11 @@
+<script>
+	export let condition;
+</script>
+
+<svelte:head>
+	{#if condition}
+		<title>woo!!!</title>
+	{:else}
+		<meta id="meta" name="title" content="woo!!!"/>
+	{/if}
+</svelte:head>

test/runtime/samples/head-if-else-raw-dynamic/_config.js

@@ -0,0 +1,19 @@
+const foo = '<script type="application/json">{ "foo": "true" }</script>';
+const bar = '<script type="application/json">{ "bar": "true" }</script>';
+
+export default {
+	props: {
+		condition: false,
+		foo,
+		bar
+	},
+
+	test({ assert, component, window }) {
+		assert.equal(window.document.head.innerHTML.includes(foo), false);
+		assert.equal(window.document.head.innerHTML.includes(bar), true);
+
+		component.condition = true;
+		assert.equal(window.document.head.innerHTML.includes(foo), true);
+		assert.equal(window.document.head.innerHTML.includes(bar), false);
+	}
+};

test/runtime/samples/head-if-else-raw-dynamic/main.svelte

@@ -0,0 +1,11 @@
+<script>
+	export let condition, foo, bar;
+</script>
+
+<svelte:head>
+	{#if condition}
+		{@html foo}
+	{:else}
+		{@html bar}
+	{/if}
+</svelte:head>

test/runtime/samples/head-raw-dynamic/Bar.svelte

@@ -0,0 +1,11 @@
+<script>
+	export let bar;
+</script>
+
+<svelte:head>
+	<meta id="meta" name="title" content="bar!!!"/>
+	{#if true}
+		{@html bar}
+	{/if}
+	<title>bar!!!</title>
+</svelte:head>

test/runtime/samples/head-raw-dynamic/Foo.svelte

@@ -0,0 +1,7 @@
+<script>
+	export let foo;
+</script>
+
+<svelte:head>
+	{@html foo}
+</svelte:head>

test/runtime/samples/head-raw-dynamic/_config.js

@@ -0,0 +1,26 @@
+const foo = '<script type="application/json">{ "foo": "true" }</script>';
+const bar = '<script type="application/json">{ "bar": "true" }</script>';
+
+export default {
+	props: {
+		condition: 1,
+		foo,
+		bar
+	},
+
+	test({ assert, component, window }) {
+		assert.equal(window.document.head.innerHTML.includes(foo), true);
+
+		component.condition = false;
+		assert.equal(window.document.head.innerHTML.includes(foo), false);
+
+		component.condition = 2;
+		assert.equal(window.document.title, 'bar!!!');
+		assert.equal(window.document.head.innerHTML.includes(bar), true);
+		assert.equal(Boolean(window.document.getElementById('meta')), true);
+
+		component.condition = false;
+		assert.equal(window.document.head.innerHTML.includes(bar), false);
+		assert.equal(window.document.getElementById('meta'), null);
+	}
+};

test/runtime/samples/head-raw-dynamic/main.svelte

@@ -0,0 +1,12 @@
+<script>
+	import Foo from './Foo.svelte';
+	import Bar from './Bar.svelte';
+
+	export let condition, foo, bar;
+</script>
+
+{#if condition === 1}
+	<Foo {foo} />
+{:else if condition === 2}
+	<Bar {bar} />
+{/if}