Throw when subscription is already removed

2017-11-20 11:13:54 -06:00
parent 856a5c3369
commit 20449a0cb2
1 changed files with 4 additions and 1 deletions
--- a/packages/0x.js/src/order_watcher/expiration_watcher.ts
+++ b/packages/0x.js/src/order_watcher/expiration_watcher.ts
@@ -35,7 +35,10 @@ export class ExpirationWatcher {
        );
    }
    public unsubscribe(): void {
-        intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists as NodeJS.Timer);
+        if (_.isUndefined(this.orderExpirationCheckingIntervalIdIfExists)) {
+            throw new Error(ZeroExError.SubscriptionNotFound);
+        }
+        intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists);
        delete this.callbackIfExists;
    }
    public addOrder(orderHash: string, expirationUnixTimestampSec: BigNumber): void {