From 1414b8ee8bdb1be901371c4cf7b8a5150d8fb771 Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Thu, 5 Oct 2017 16:32:01 +0300
Subject: Add type assertions for callback parameters

---
 src/contract_wrappers/exchange_wrapper.ts | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/contract_wrappers/exchange_wrapper.ts')

diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 0eb600ff6..b2e48b36e 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -630,6 +630,7 @@ export class ExchangeWrapper extends ContractWrapper {
                                 callback: EventCallback): Promise<string> {
         assert.doesBelongToStringEnum('eventName', eventName, ExchangeEvents);
         assert.doesConformToSchema('indexFilterValues', indexFilterValues, schemas.indexFilterValuesSchema);
+        assert.isFunction('callback', callback);
         const exchangeContractAddress = await this.getContractAddressAsync();
         const subscriptionToken = this._subscribe(
             exchangeContractAddress, eventName, indexFilterValues, artifacts.ExchangeArtifact.abi, callback,
-- 
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