fix

src/compiler/compile/index.ts

@@ -1,4 +1,3 @@
-import { assign } from '../../runtime/internal/utils';
 import Stats from '../Stats';
 import parse from '../parse/index';
 import render_dom from './render_dom/index';
@@ -68,7 +67,7 @@ function validate_options(options: CompileOptions, warnings: Warning[]) {
 }
 
 export default function compile(source: string, options: CompileOptions = {}) {
-	options = assign({ generate: 'dom', dev: false }, options);
+	options = { generate: 'dom', dev: false, ...options };
 
 	const stats = new Stats();
 	const warnings = [];

src/compiler/compile/render_dom/index.ts

@@ -267,7 +267,7 @@ export default function dom(
 
 			const insert = (reassigned || export_name)
 				? b`${`$$subscribe_${name}`}()`
-				: b`$$self.$$.on_destroy.push(@subscribe(${name}, #value => {$$invalidate(${i}, (${value} = #value));})`;
+				: b`$$self.$$.on_destroy.push(@subscribe(${name}, #value => {$$invalidate(${i}, ${value} = #value);}))`;
 
 			if (component.compile_options.dev) {
 				return b`@validate_store(${name}, '${name}'); ${insert}`;