1 files changed, 2 insertions, 1 deletions
diff --git a/src/fields/Types.ts b/src/fields/Types.ts
index 220a30fe4..c90f3b6b3 100644
--- a/src/fields/Types.ts
+++ b/src/fields/Types.ts
@@ -111,5 +111,6 @@ export interface PromiseLike<T> {
     then(callback: (field: Opt<T>) => void): void;
 }
 export function PromiseValue<T extends Field>(field: FieldResult<T>): PromiseLike<Opt<T>> {
-    return field instanceof Promise ? field : { then(cb: ((field: Opt<T>) => void)) { return cb(field); } };
+    if (field instanceof Promise) return field as Promise<Opt<T>>;
+    return { then(cb: ((field: Opt<T>) => void)) { return cb(field); } };
 }
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