WIP

packages/svelte/src/compiler/phases/3-transform/client/visitors/RenderTag.js

@@ -23,10 +23,10 @@ export function RenderTag(node, context) {
 		const arg = /** @type {Expression} */ (call.arguments[i]);
 		const metadata = node.metadata.arguments[i];
 
-		let expression = build_expression(context, arg, metadata);
+		let expression = memoizer.add(build_expression(context, arg, metadata), metadata);
 
 		if (metadata.has_await || metadata.has_call) {
-			expression = b.call('$.get', memoizer.add(expression, metadata));
+			expression = b.call('$.get', expression);
 		}
 
 		args.push(b.thunk(expression));

packages/svelte/src/compiler/phases/3-transform/server/visitors/AwaitBlock.js

@@ -25,8 +25,12 @@ export function AwaitBlock(node, context) {
 		)
 	);
 
-	if (node.metadata.expression.has_await) {
-		statement = create_async_block(b.block([statement]));
+	if (node.metadata.expression.is_async()) {
+		statement = create_async_block(
+			b.block([statement]),
+			node.metadata.expression.blockers(),
+			node.metadata.expression.has_await
+		);
 	}
 
 	context.state.template.push(statement, block_close);

packages/svelte/src/compiler/phases/3-transform/server/visitors/RenderTag.js

@@ -3,32 +3,48 @@
 /** @import { ComponentContext } from '../types.js' */
 import { unwrap_optional } from '../../../../utils/ast.js';
 import * as b from '#compiler/builders';
-import { empty_comment } from './shared/utils.js';
+import { create_async_block, empty_comment, PromiseOptimiser } from './shared/utils.js';
 
 /**
  * @param {AST.RenderTag} node
  * @param {ComponentContext} context
  */
 export function RenderTag(node, context) {
+	const optimiser = new PromiseOptimiser();
+
 	const callee = unwrap_optional(node.expression).callee;
 	const raw_args = unwrap_optional(node.expression).arguments;
 
-	const snippet_function = /** @type {Expression} */ (context.visit(callee));
+	const snippet_function = optimiser.transform(
+		/** @type {Expression} */ (context.visit(callee)),
+		node.metadata.expression
+	);
 
-	const snippet_args = raw_args.map((arg) => {
-		return /** @type {Expression} */ (context.visit(arg));
+	const snippet_args = raw_args.map((arg, i) => {
+		return optimiser.transform(
+			/** @type {Expression} */ (context.visit(arg)),
+			node.metadata.arguments[i]
+		);
 	});
 
-	context.state.template.push(
-		b.stmt(
-			(node.expression.type === 'CallExpression' ? b.call : b.maybe_call)(
-				snippet_function,
-				b.id('$$renderer'),
-				...snippet_args
-			)
+	let statement = b.stmt(
+		(node.expression.type === 'CallExpression' ? b.call : b.maybe_call)(
+			snippet_function,
+			b.id('$$renderer'),
+			...snippet_args
 		)
 	);
 
+	if (optimiser.is_async()) {
+		statement = create_async_block(
+			b.block([optimiser.apply(), statement]),
+			optimiser.blockers(),
+			optimiser.has_await
+		);
+	}
+
+	context.state.template.push(statement);
+
 	if (!context.state.skip_hydration_boundaries) {
 		context.state.template.push(empty_comment);
 	}

packages/svelte/src/compiler/phases/3-transform/server/visitors/SlotElement.js

@@ -65,10 +65,13 @@ export function SlotElement(node, context) {
 		fallback
 	);
 
-	const statement =
-		optimiser.expressions.length > 0
-			? create_async_block(b.block([optimiser.apply(), b.stmt(slot)]))
-			: b.stmt(slot);
+	const statement = optimiser.is_async()
+		? create_async_block(
+				b.block([optimiser.apply(), b.stmt(slot)]),
+				optimiser.blockers(),
+				optimiser.has_await
+			)
+		: b.stmt(slot);
 
 	context.state.template.push(block_open, statement, block_close);
 }