fix #1497

src/compile/nodes/EachBlock.ts

@@ -393,14 +393,16 @@ export default class EachBlock extends Node {
 			allDependencies.add(dependency);
 		});
 
-		const outro = this.block.hasOutros && block.getUniqueName('outro')
-		if (outro) {
+		const outroBlock = this.block.hasOutros && block.getUniqueName('outroBlock')
+		if (outroBlock) {
 			block.builders.init.addBlock(deindent`
-				function ${outro}(i, detach, fn) {
+				function ${outroBlock}(i, detach, fn) {
 					if (${iterations}[i]) {
 						${iterations}[i].o(() => {
-							${iterations}[i].d(detach);
-							if (detach) ${iterations}[i] = null;
+							if (detach) {
+								${iterations}[i].d(detach);
+								${iterations}[i] = null;
+							}
 							if (fn) fn();
 						});
 					}
@@ -447,7 +449,7 @@ export default class EachBlock extends Node {
 			if (this.block.hasOutros) {
 				destroy = deindent`
 					@transitionManager.groupOutros();
-					for (; #i < ${iterations}.length; #i += 1) ${outro}(#i, 1);
+					for (; #i < ${iterations}.length; #i += 1) ${outroBlock}(#i, 1);
 				`;
 			} else {
 				destroy = deindent`
@@ -473,10 +475,10 @@ export default class EachBlock extends Node {
 			`);
 		}
 
-		if (outro && this.compiler.options.nestedTransitions) {
+		if (outroBlock && this.compiler.options.nestedTransitions) {
 			block.builders.outro.addBlock(deindent`
 				#outrocallback = @callAfter(#outrocallback, #i);
-				for (let #i = 0; #i < ${iterations}.length; #i += 1) ${outro}(#i, 0, #outrocallback);`
+				for (let #i = 0; #i < ${iterations}.length; #i += 1) ${outroBlock}(#i, 0, #outrocallback);`
 			);
 		}