fixes

src/compiler/compile/render_dom/wrappers/IfBlock.ts

@@ -191,7 +191,7 @@ export default class IfBlockWrapper extends Wrapper {
 
 		const vars = { name, anchor, if_exists_condition, has_else, has_transitions };
 
-		const detaching = is_head(parent_node) ? '' : 'detaching';
+		const detaching = is_head(parent_node) ? null : 'detaching';
 
 		if (this.node.else) {
 			this.branches.forEach(branch => {
@@ -322,7 +322,11 @@ export default class IfBlockWrapper extends Wrapper {
 			block.chunks.update.push(b`${name}.p(#changed, #ctx);`);
 		}
 
-		block.chunks.destroy.push(b`if (${if_exists_condition}) ${name}.d(${detaching});`);
+		block.chunks.destroy.push(b`
+			if (${if_exists_condition}) {
+				${name}.d(${detaching});
+			}
+		`);
 	}
 
 	// if any of the siblings have outros, we need to keep references to the blocks
@@ -362,7 +366,7 @@ export default class IfBlockWrapper extends Wrapper {
 						${this.branches.map(({ dependencies, condition, snippet }, i) => condition
 						? b`
 						${snippet && b`if ((${condition} == null) || ${changed(dependencies)}) ${condition} = !!(${snippet})`}
-						if (${condition}) return ${String(i)};`
+						if (${condition}) return ${i};`
 						: b`return ${i};`)}
 						${!has_else && b`return -1;`}
 					}
@@ -545,11 +549,17 @@ export default class IfBlockWrapper extends Wrapper {
 				`);
 			}
 		} else if (dynamic) {
-			block.chunks.update.push(
+			block.chunks.update.push(b`
-				b`if (${branch.condition}) ${name}.p(#changed, #ctx);`
+				if (${branch.condition}) {
-			);
+					${name}.p(#changed, #ctx);
+				}
+			`);
 		}
 
-		block.chunks.destroy.push(b`if (${if_exists_condition}) ${name}.d(${detaching});`);
+		block.chunks.destroy.push(b`
+			if (${if_exists_condition}) {
+				${name}.d(${detaching});
+			}
+		`);
 	}
 }

src/compiler/compile/render_dom/wrappers/Title.ts

@@ -3,7 +3,7 @@ import Wrapper from './shared/Wrapper';
 import Renderer from '../Renderer';
 import Block from '../Block';
 import Title from '../../nodes/Title';
-import { stringify, string_literal } from '../../utils/stringify';
+import { string_literal } from '../../utils/stringify';
 import add_to_set from '../../utils/add_to_set';
 import Text from '../../nodes/Text';
 import { Identifier } from 'estree';
@@ -93,8 +93,8 @@ export default class TitleWrapper extends Wrapper {
 			}
 		} else {
 			const value = this.node.children.length > 0
-				? stringify((this.node.children[0] as Text).data)
+				? string_literal((this.node.children[0] as Text).data)
-				: '""';
+				: x`""`;
 
 			block.chunks.hydrate.push(b`@_document.title = ${value};`);
 		}

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

@@ -3,7 +3,7 @@ export default {
 		condition: false
 	},
 
-	test({ assert, component, target, window }) {
+	test({ assert, component, window }) {
 		assert.equal(window.document.title, '');
 
 		component.condition = true;