fix some transition stuff

src/compiler/compile/render_dom/wrappers/EachBlock.ts

@@ -539,7 +539,7 @@ export default class EachBlockWrapper extends Wrapper {
 			// We declare `i` as block scoped here, as the `remove_old_blocks` code
 			// may rely on continuing where this iteration stopped.
 			const update = b`
-				${!this.block.has_update_method && `const #old_length = ${this.vars.each_block_value}.length;`}
+				${!this.block.has_update_method && b`const #old_length = ${this.vars.each_block_value}.length;`}
 				${this.vars.each_block_value} = ${snippet};
 
 				let #i;

test/runtime/samples/transition-js-nested-each/_config.js

@@ -4,7 +4,7 @@ export default {
 		things: ['a']
 	},
 
-	test({ assert, component, target, window, raf }) {
+	test({ assert, component, target, raf }) {
 		component.x = true;
 
 		const div = target.querySelector('div');