fix: change signature of spread_props

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

@@ -858,7 +858,7 @@ function serialize_inline_component(node, component_name, context) {
 			? b.object(/** @type {import('estree').Property[]} */ (props_and_spreads[0]) || [])
 			: b.call(
 					'$.spread_props',
-					...props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p)),
+					b.array(props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p))),
 					b.array(spreads_keys)
 				);
 	/** @param {import('estree').Identifier} node_id */
@@ -2995,7 +2995,7 @@ export const template_visitors = {
 		const props_expression =
 			spreads.length === 0
 				? b.object(props)
-				: b.call('$.spread_props', b.object(props), ...spreads, b.array(spreads_keys));
+				: b.call('$.spread_props', b.object(props), b.array(spreads), b.array(spreads_keys));
 		const fallback =
 			node.fragment.nodes.length === 0
 				? b.literal(null)

packages/svelte/src/internal/client/reactivity/props.js

@@ -87,7 +87,7 @@ export function rest_props(props, exclude, name) {
  * that looks like `() => { dynamic: props }, { static: prop }, ..` and wraps
  * them so that the whole thing is passed to the component as the `$$props` argument.
  * @template {Record<string | symbol, unknown>} T
- * @type {ProxyHandler<{ props: (Array<T | (() => T)>), keys: T }>}}
+ * @type {ProxyHandler<{ props: (Array<T | (() => T)>), keys: (Array<(() => import('./types.js').Value<string>) | undefined>) }>}}
  */
 const spread_props_handler = {
 	get(target, key) {
@@ -159,10 +159,10 @@ const spread_props_handler = {
 
 /**
  * @param {Array<Record<string, unknown> | (() => Record<string, unknown>)>} props
+ * @param {(Array<(() => import('./types.js').Value<string>) | undefined>)} keys
  * @returns {any}
  */
-export function spread_props(...props) {
-	const keys = props.pop();
+export function spread_props(props, keys) {
 	return new Proxy({ props, keys }, spread_props_handler);
 }