feat: allow innerHtml if no dynamic dependencies

src/compiler/compile/render_dom/wrappers/Element/index.ts

@@ -6,6 +6,7 @@ import { is_void, sanitize } from '../../../../utils/names';
 import FragmentWrapper from '../Fragment';
 import { escape_html, string_literal } from '../../../utils/stringify';
 import TextWrapper from '../Text';
+import TagWrapper from '../shared/Tag';
 import fix_attribute_casing from './fix_attribute_casing';
 import { b, x, p } from 'code-red';
 import { namespaces } from '../../../../utils/namespaces';
@@ -849,7 +850,7 @@ export default class ElementWrapper extends Wrapper {
 	}
 }
 
-function to_html(wrappers: Array<ElementWrapper | TextWrapper>, block: Block, literal: any, state: any) {
+function to_html(wrappers: Array<ElementWrapper | TextWrapper | TagWrapper>, block: Block, literal: any, state: any) {
 	wrappers.forEach(wrapper => {
 		if (wrapper.node.type === 'Text') {
 			if ((wrapper as TextWrapper).use_space()) state.quasi.value.raw += ' ';
@@ -867,6 +868,15 @@ function to_html(wrappers: Array<ElementWrapper | TextWrapper>, block: Block, li
 				.replace(/\$/g, '\\$');
 		}
 
+		else if (wrapper.node.type === 'MustacheTag' || wrapper.node.type === 'RawMustacheTag' ) {
+			literal.quasis.push(state.quasi);
+			literal.expressions.push(wrapper.node.expression.manipulate(block));
+			state.quasi = {
+				type: 'TemplateElement',
+				value: { raw: '' }
+			};
+		}
+
 		else if (wrapper.node.name === 'noscript') {
 			// do nothing
 		}

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

@@ -12,7 +12,6 @@ export default class MustacheTagWrapper extends Tag {
 
 	constructor(renderer: Renderer, block: Block, parent: Wrapper, node: MustacheTag | RawMustacheTag) {
 		super(renderer, block, parent, node);
-		this.cannot_use_innerhtml();
 	}
 
 	render(block: Block, parent_node: Identifier, parent_nodes: Identifier) {

src/compiler/compile/render_dom/wrappers/shared/Tag.ts

@@ -11,11 +11,17 @@ export default class Tag extends Wrapper {
 
 	constructor(renderer: Renderer, block: Block, parent: Wrapper, node: MustacheTag | RawMustacheTag) {
 		super(renderer, block, parent, node);
-		this.cannot_use_innerhtml();
+		if (!this.is_dependencies_static()) {
+			this.cannot_use_innerhtml();
+		}
 
 		block.add_dependencies(node.expression.dependencies);
 	}
 
+	is_dependencies_static() {
+		return this.node.expression.contextual_dependencies.size === 0 && this.node.expression.dynamic_dependencies().length === 0;
+	}
+
 	rename_this_method(
 		block: Block,
 		update: ((value: Node) => (Node | Node[]))

test/js/samples/hoisted-const/expected.js

@@ -1,28 +1,23 @@
 import {
 	SvelteComponent,
-	append,
 	detach,
 	element,
 	init,
 	insert,
 	noop,
-	safe_not_equal,
-	text
+	safe_not_equal
 } from "svelte/internal";
 
 function create_fragment(ctx) {
 	let b;
-	let t_value = get_answer() + "";
-	let t;
 
 	return {
 		c() {
 			b = element("b");
-			t = text(t_value);
+			b.innerHTML = `${get_answer()}`;
 		},
 		m(target, anchor) {
 			insert(target, b, anchor);
-			append(b, t);
 		},
 		p: noop,
 		i: noop,

test/js/samples/hoisted-let/expected.js

@@ -1,28 +1,23 @@
 import {
 	SvelteComponent,
-	append,
 	detach,
 	element,
 	init,
 	insert,
 	noop,
-	safe_not_equal,
-	text
+	safe_not_equal
 } from "svelte/internal";
 
 function create_fragment(ctx) {
 	let b;
-	let t_value = get_answer() + "";
-	let t;
 
 	return {
 		c() {
 			b = element("b");
-			t = text(t_value);
+			b.innerHTML = `${get_answer()}`;
 		},
 		m(target, anchor) {
 			insert(target, b, anchor);
-			append(b, t);
 		},
 		p: noop,
 		i: noop,

test/js/samples/non-mutable-reference/expected.js

@@ -1,33 +1,23 @@
 import {
 	SvelteComponent,
-	append,
 	detach,
 	element,
 	init,
 	insert,
 	noop,
-	safe_not_equal,
-	text
+	safe_not_equal
 } from "svelte/internal";
 
 function create_fragment(ctx) {
 	let h1;
-	let t0;
-	let t1;
-	let t2;
 
 	return {
 		c() {
 			h1 = element("h1");
-			t0 = text("Hello ");
-			t1 = text(name);
-			t2 = text("!");
+			h1.innerHTML = `Hello ${name}!`;
 		},
 		m(target, anchor) {
 			insert(target, h1, anchor);
-			append(h1, t0);
-			append(h1, t1);
-			append(h1, t2);
 		},
 		p: noop,
 		i: noop,

test/js/samples/unchanged-expression/expected.js

@@ -0,0 +1,78 @@
+import {
+	SvelteComponent,
+	append,
+	detach,
+	element,
+	init,
+	insert,
+	noop,
+	safe_not_equal,
+	set_data,
+	space,
+	text
+} from "svelte/internal";
+
+function create_fragment(ctx) {
+	let div0;
+	let t7;
+	let div1;
+	let p3;
+	let t8;
+	let t9;
+
+	return {
+		c() {
+			div0 = element("div");
+
+			div0.innerHTML = `<p>Hello world</p> 
+  <p>Hello ${world1}</p> 
+  <p>Hello ${world2}</p>`;
+
+			t7 = space();
+			div1 = element("div");
+			p3 = element("p");
+			t8 = text("Hello ");
+			t9 = text(ctx.world3);
+		},
+		m(target, anchor) {
+			insert(target, div0, anchor);
+			insert(target, t7, anchor);
+			insert(target, div1, anchor);
+			append(div1, p3);
+			append(p3, t8);
+			append(p3, t9);
+		},
+		p(changed, ctx) {
+			if (changed.world3) set_data(t9, ctx.world3);
+		},
+		i: noop,
+		o: noop,
+		d(detaching) {
+			if (detaching) detach(div0);
+			if (detaching) detach(t7);
+			if (detaching) detach(div1);
+		}
+	};
+}
+
+let world1 = "world";
+let world2 = "world";
+
+function instance($$self, $$props, $$invalidate) {
+	const world3 = "world";
+
+	function foo() {
+		$$invalidate("world3", world3 = "svelte");
+	}
+
+	return { world3 };
+}
+
+class Component extends SvelteComponent {
+	constructor(options) {
+		super();
+		init(this, options, instance, create_fragment, safe_not_equal, []);
+	}
+}
+
+export default Component;

test/js/samples/unchanged-expression/input.svelte

@@ -0,0 +1,17 @@
+<script>
+  let world1 = 'world';
+  let world2 = 'world';
+  const world3 = 'world';
+  function foo() {
+    world3 = 'svelte';
+  }
+
+</script>
+<div>
+  <p>Hello world</p>
+  <p>Hello {world1}</p>
+  <p>Hello {world2}</p>
+</div>
+<div>
+  <p>Hello {world3}</p>
+</div>

test/runtime/index.js

@@ -166,7 +166,8 @@ describe("runtime", () => {
 							mod,
 							target,
 							window,
-							raf
+							raf,
+							compileOptions
 						})).then(() => {
 							component.$destroy();
 

test/runtime/samples/lifecycle-render-order-for-children/_config.js

@@ -3,26 +3,47 @@ import order from './order.js';
 export default {
 	skip_if_ssr: true,
 
-	test({ assert, component, target }) {
-		assert.deepEqual(order, [
-			'0: beforeUpdate',
-			'0: render',
-			'1: beforeUpdate',
-			'1: render',
-			'2: beforeUpdate',
-			'2: render',
-			'3: beforeUpdate',
-			'3: render',
-			'1: onMount',
-			'1: afterUpdate',
-			'2: onMount',
-			'2: afterUpdate',
-			'3: onMount',
-			'3: afterUpdate',
-			'0: onMount',
-			'0: afterUpdate'
-		]);
+	test({ assert, component, target, compileOptions }) {
+		if (compileOptions.hydratable) {
+			assert.deepEqual(order, [
+				'0: beforeUpdate',
+				'0: render',
+				'1: beforeUpdate',
+				'1: render',
+				'2: beforeUpdate',
+				'2: render',
+				'3: beforeUpdate',
+				'3: render',
+				'1: onMount',
+				'1: afterUpdate',
+				'2: onMount',
+				'2: afterUpdate',
+				'3: onMount',
+				'3: afterUpdate',
+				'0: onMount',
+				'0: afterUpdate',
+			]);
+		} else {
+			assert.deepEqual(order, [
+				'0: beforeUpdate',
+				'0: render',
+				'1: beforeUpdate',
+				'2: beforeUpdate',
+				'3: beforeUpdate',
+				'1: render',
+				'2: render',
+				'3: render',
+				'1: onMount',
+				'1: afterUpdate',
+				'2: onMount',
+				'2: afterUpdate',
+				'3: onMount',
+				'3: afterUpdate',
+				'0: onMount',
+				'0: afterUpdate',
+			]);
+		}
 
 		order.length = 0;
-	}
+	},
 };