fix

packages/svelte/src/compiler/phases/2-analyze/index.js

@@ -1098,14 +1098,6 @@ function calculate_blockers(instance, analysis) {
 		sync_group = [];
 	}
 
-	/**
-	 * @param {ESTree.Statement | ESTree.VariableDeclarator} node
-	 */
-	function push_async_entry(node) {
-		flush_sync_group();
-		analysis.instance_body.async.push({ nodes: [node], has_await: true });
-	}
-
 	/**
 	 * Analysis of blockers for functions is deferred until we know which statements are async/blockers
 	 * @type {Array<ESTree.FunctionDeclaration | ESTree.VariableDeclarator>}
@@ -1167,6 +1159,9 @@ function calculate_blockers(instance, analysis) {
 
 					trace_references(declarator, reads, writes, instance.scope);
 
+					// Needs to happen before blocker computation
+					if (has_await) flush_sync_group();
+
 					const blocker = /** @type {NonNullable<Binding['blocker']>} */ (
 						b.member(promises, b.literal(analysis.instance_body.async.length), true)
 					);
@@ -1181,7 +1176,7 @@ function calculate_blockers(instance, analysis) {
 
 					if (has_await) {
 						// one declarator per declaration, makes things simpler
-						push_async_entry(declarator);
+						analysis.instance_body.async.push({ nodes: [node], has_await: true });
 					} else {
 						sync_group.push(declarator);
 					}
@@ -1196,6 +1191,9 @@ function calculate_blockers(instance, analysis) {
 
 			trace_references(node, reads, writes, instance.scope);
 
+			// Needs to happen before blocker computation
+			if (has_await) flush_sync_group();
+
 			const blocker = /** @type {NonNullable<Binding['blocker']>} */ (
 				b.member(promises, b.literal(analysis.instance_body.async.length), true)
 			);
@@ -1209,7 +1207,7 @@ function calculate_blockers(instance, analysis) {
 			}
 
 			if (has_await) {
-				push_async_entry(node);
+				analysis.instance_body.async.push({ nodes: [node], has_await: true });
 			} else {
 				sync_group.push(node);
 			}

packages/svelte/src/compiler/phases/3-transform/shared/transform-async.js

@@ -85,22 +85,20 @@ function transform_async_node(node, transform) {
 			transform(b.var(node.id, node.init))
 		);
 
-		return (
-			visited.type === 'VariableDeclaration'
-				? visited.declarations.map((node) => {
-						if (
-							node.id.type === 'Identifier' &&
-							(node.id.name.startsWith('$$d') || node.id.name.startsWith('$$array'))
-						) {
-							// This intermediate declaration is created in VariableDeclaration.js;
-							// subsequent statements may depend on it.
-							return b.var(node.id, node.init);
-						}
-
-						return b.stmt(b.assignment('=', node.id, node.init ?? b.void0));
-					})
-				: []
-		);
+		return visited.type === 'VariableDeclaration'
+			? visited.declarations.map((node) => {
+					if (
+						node.id.type === 'Identifier' &&
+						(node.id.name.startsWith('$$d') || node.id.name.startsWith('$$array'))
+					) {
+						// This intermediate declaration is created in VariableDeclaration.js;
+						// subsequent statements may depend on it.
+						return b.var(node.id, node.init);
+					}
+
+					return b.stmt(b.assignment('=', node.id, node.init ?? b.void0));
+				})
+			: [];
 	}
 
 	if (node.type === 'ClassDeclaration') {