work you slob

packages/svelte/src/compiler/phases/1-parse/state/tag.js

@@ -597,10 +597,6 @@ function special(parser) {
 			error(expression, 'TODO', 'expected an identifier followed by (...)');
 		}
 
-		if (expression.arguments.length > 1) {
-			error(expression.arguments[1], 'TODO', 'expected at most one argument');
-		}
-
 		parser.allow_whitespace();
 		parser.eat('}', true);
 
@@ -610,7 +606,7 @@ function special(parser) {
 				start,
 				end: parser.index,
 				expression: expression.callee,
-				argument: expression.arguments[0] ?? null
+				arguments: expression.arguments
 			})
 		);
 	}

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

@@ -1755,9 +1755,9 @@ export const template_visitors = {
 
 		/** @type {import('estree').Expression[]} */
 		const args = [context.state.node];
-		if (node.argument) {
-			args.push(b.thunk(/** @type {import('estree').Expression} */ (context.visit(node.argument))));
-		}
+		node.arguments.forEach((arg) =>
+			args.push(b.thunk(/** @type {import('estree').Expression} */ (context.visit(arg))))
+		);
 
 		let snippet_function = /** @type {import('estree').Expression} */ (
 			context.visit(node.expression)

packages/svelte/src/compiler/types/template.d.ts

@@ -13,7 +13,8 @@ import type {
 	Node,
 	ObjectExpression,
 	Pattern,
-	Program
+	Program,
+	SpreadElement
 } from 'estree';
 
 export interface BaseNode {
@@ -147,7 +148,7 @@ export interface DebugTag extends BaseNode {
 export interface RenderTag extends BaseNode {
 	type: 'RenderTag';
 	expression: Identifier;
-	argument: null | Expression;
+	arguments: (Expression | SpreadElement)[];
 }
 
 type Tag = ExpressionTag | HtmlTag | ConstTag | DebugTag | RenderTag;