diff --git a/packages/core/src/connectors/aliyun-dm/index.ts b/packages/core/src/connectors/aliyun-dm/index.ts
index 131a233fe..15d44f06c 100644
--- a/packages/core/src/connectors/aliyun-dm/index.ts
+++ b/packages/core/src/connectors/aliyun-dm/index.ts
@@ -1,5 +1,7 @@
 import { z } from 'zod';
 
+import assertThat from '@/utils/assert-that';
+
 import {
   ConnectorError,
   ConnectorErrorCodes,
@@ -61,12 +63,13 @@ export const sendMessage: EmailSendMessageFunction = async (address, type, data)
   const { accessKeyId, accessKeySecret, accountName, fromAlias, templates } = config;
   const template = templates.find((template) => template.usageType === type);
 
-  if (!template) {
-    throw new ConnectorError(
+  assertThat(
+    template,
+    new ConnectorError(
       ConnectorErrorCodes.TemplateNotFound,
       `Cannot find template for type: ${type}`
-    );
-  }
+    )
+  );
 
   return singleSendMail(
     {
diff --git a/packages/core/src/connectors/aliyun-sms/index.ts b/packages/core/src/connectors/aliyun-sms/index.ts
index 222d5de17..4a35da6be 100644
--- a/packages/core/src/connectors/aliyun-sms/index.ts
+++ b/packages/core/src/connectors/aliyun-sms/index.ts
@@ -1,5 +1,7 @@
 import { z } from 'zod';
 
+import assertThat from '@/utils/assert-that';
+
 import {
   ConnectorError,
   ConnectorErrorCodes,
@@ -84,9 +86,10 @@ export const sendMessage: SmsSendMessageFunction = async (phone, type, { code })
   const { accessKeyId, accessKeySecret, signName, templates } = config;
   const template = templates.find(({ usageType }) => usageType === type);
 
-  if (!template) {
-    throw new ConnectorError(ConnectorErrorCodes.TemplateNotFound, `Cannot find template!`);
-  }
+  assertThat(
+    template,
+    new ConnectorError(ConnectorErrorCodes.TemplateNotFound, `Cannot find template!`)
+  );
 
   return sendSms(
     {
diff --git a/packages/core/src/connectors/github/index.ts b/packages/core/src/connectors/github/index.ts
index efa70f20d..ee83eb939 100644
--- a/packages/core/src/connectors/github/index.ts
+++ b/packages/core/src/connectors/github/index.ts
@@ -2,6 +2,8 @@ import got, { RequestError as GotRequestError } from 'got';
 import { stringify } from 'query-string';
 import { z } from 'zod';
 
+import assertThat from '@/utils/assert-that';
+
 import {
   ConnectorMetadata,
   GetAccessToken,
@@ -78,9 +80,7 @@ export const getAccessToken: GetAccessToken = async (code) => {
     })
     .json<AccessTokenResponse>();
 
-  if (!accessToken) {
-    throw new ConnectorError(ConnectorErrorCodes.SocialAuthCodeInvalid);
-  }
+  assertThat(accessToken, new ConnectorError(ConnectorErrorCodes.SocialAuthCodeInvalid));
 
   return accessToken;
 };
diff --git a/packages/core/src/connectors/google/index.ts b/packages/core/src/connectors/google/index.ts
index 58a0aa7bc..a00294f21 100644
--- a/packages/core/src/connectors/google/index.ts
+++ b/packages/core/src/connectors/google/index.ts
@@ -8,6 +8,8 @@ import got, { RequestError as GotRequestError } from 'got';
 import { stringify } from 'query-string';
 import { z } from 'zod';
 
+import assertThat from '@/utils/assert-that';
+
 import {
   ConnectorError,
   ConnectorErrorCodes,
@@ -88,9 +90,7 @@ export const getAccessToken: GetAccessToken = async (code, redirectUri) => {
     })
     .json<AccessTokenResponse>();
 
-  if (!accessToken) {
-    throw new ConnectorError(ConnectorErrorCodes.SocialAuthCodeInvalid);
-  }
+  assertThat(accessToken, new ConnectorError(ConnectorErrorCodes.SocialAuthCodeInvalid));
 
   return accessToken;
 };