tweak

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

@@ -11,35 +11,22 @@ import { build_expression } from './shared/utils.js';
 export function KeyBlock(node, context) {
 	context.state.template.push_comment();
 
-	const key = build_expression(context, node.expression, node.metadata.expression);
+	const { has_await } = node.metadata.expression;
+
+	const expression = build_expression(context, node.expression, node.metadata.expression);
+	const key = b.thunk(has_await ? b.call('$.get', b.id('$$key')) : expression);
 	const body = /** @type {Expression} */ (context.visit(node.fragment));
 
-	if (node.metadata.expression.has_await) {
-		context.state.init.push(
-			b.stmt(
-				b.call(
-					'$.async',
-					context.state.node,
-					b.array([b.thunk(key, true)]),
-					b.arrow(
-						[context.state.node, b.id('$$key')],
-						b.block([
-							b.stmt(
-								b.call(
-									'$.key',
-									context.state.node,
-									b.thunk(b.call('$.get', b.id('$$key'))),
-									b.arrow([b.id('$$anchor')], body)
-								)
-							)
-						])
-					)
-				)
-			)
-		);
-	} else {
-		context.state.init.push(
-			b.stmt(b.call('$.key', context.state.node, b.thunk(key), b.arrow([b.id('$$anchor')], body)))
+	let call = b.call('$.key', context.state.node, key, b.arrow([b.id('$$anchor')], body));
+
+	if (has_await) {
+		call = b.call(
+			'$.async',
+			context.state.node,
+			b.array([b.thunk(expression, true)]),
+			b.arrow([context.state.node, b.id('$$key')], b.block([b.stmt(call)]))
 		);
 	}
+
+	context.state.init.push(b.stmt(call));
 }

packages/svelte/src/internal/client/dom/blocks/key.js

@@ -15,7 +15,7 @@ import { current_batch } from '../../reactivity/batch.js';
  * @param {(anchor: Node) => TemplateNode | void} render_fn
  * @returns {void}
  */
-export function key_block(node, get_key, render_fn) {
+export function key(node, get_key, render_fn) {
 	if (hydrating) {
 		hydrate_next();
 	}

packages/svelte/src/internal/client/index.js

@@ -13,7 +13,7 @@ export { async } from './dom/blocks/async.js';
 export { validate_snippet_args } from './dev/validation.js';
 export { await_block as await } from './dom/blocks/await.js';
 export { if_block as if } from './dom/blocks/if.js';
-export { key_block as key } from './dom/blocks/key.js';
+export { key } from './dom/blocks/key.js';
 export { css_props } from './dom/blocks/css-props.js';
 export { index, each } from './dom/blocks/each.js';
 export { html } from './dom/blocks/html.js';