diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index e37a4d2d048..12377a0f26c 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -6157,12 +6157,11 @@ const _super = (function (geti, seti) {
             /** Serializes the return type of function. Used by the __metadata decorator for a method. */
             function emitSerializedReturnTypeOfNode(node: Node) {
                 if (node && isFunctionLike(node)) {
-                    const fn = <FunctionLikeDeclaration>node;
-                    if (fn.type) {
+                    if ((<FunctionLikeDeclaration>node).type) {
                         emitSerializedTypeNode((<FunctionLikeDeclaration>node).type);
                         return;
                     }
-                    else if (isAsyncFunctionLike(fn)) {
+                    else if (isAsyncFunctionLike(<FunctionLikeDeclaration>node)) {
                         write("Promise");
                         return;
                     }