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-rw-r--r--src/shapex.ts2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/shapex.ts b/src/shapex.ts
index 4fde18b..8ef6ebd 100644
--- a/src/shapex.ts
+++ b/src/shapex.ts
@@ -35,7 +35,7 @@ export type EventCallback<
T,
W extends unknown = undefined,
D extends unknown = W
-> = (state: T, data?: W) => SubscriptionResponse<T, W, D>;
+> = (state: T, data?: W) => SubscriptionResponse<T, W, D> | void;
type Subscription<T, W extends unknown = undefined, D extends unknown = W> = {
listener: string;