diff --git a/.eslintrc.yml b/.eslintrc.yml
index 1d08356..fbd4155 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -12,6 +12,7 @@ parserOptions:
 ignorePatterns:
   - dist
   - dist-cjs
+  - lib/__tests__/**
   - lib/apis/**
   - lib/models/**
   - lib/index.ts
diff --git a/.github/workflows/build-test-ci.yml b/.github/workflows/build-test-ci.yml
index 56ac11d..3065a36 100644
--- a/.github/workflows/build-test-ci.yml
+++ b/.github/workflows/build-test-ci.yml
@@ -32,4 +32,5 @@ jobs:
         run: pnpm config set enable-pre-post-scripts true
       - run: pnpm install
       - run: pnpm build
+      - run: pnpm lint
       - run: pnpm test
diff --git a/lib/sdk/clients/browser/authcode-with-pkce.ts b/lib/sdk/clients/browser/authcode-with-pkce.ts
index ac2fbd4..f586df6 100644
--- a/lib/sdk/clients/browser/authcode-with-pkce.ts
+++ b/lib/sdk/clients/browser/authcode-with-pkce.ts
@@ -175,7 +175,7 @@ const createAuthCodeWithPKCEClient = (options: BrowserPKCEClientOptions) => {
         `Cannot return claim "${claim}", no authentication credential found`
       );
     }
-    return tokenClaims.getClaimValue(sessionManager, claim, type);
+    return await tokenClaims.getClaimValue(sessionManager, claim, type);
   };
 
   /**
diff --git a/lib/sdk/clients/server/authorization-code.ts b/lib/sdk/clients/server/authorization-code.ts
index 352ee05..b9a62de 100644
--- a/lib/sdk/clients/server/authorization-code.ts
+++ b/lib/sdk/clients/server/authorization-code.ts
@@ -1,5 +1,5 @@
 import { AuthorizationCode, AuthCodeWithPKCE } from '../../oauth2-flows/index.js';
-import { default as withAuthUtilities } from './with-auth-utilities.js';
+import withAuthUtilities from './with-auth-utilities.js';
 import { type SessionManager } from '../../session-managers/index.js';
 import type { UserType } from '../../utilities/index.js';
 import * as utilities from '../../utilities/index.js';
diff --git a/lib/sdk/clients/server/client-credentials.ts b/lib/sdk/clients/server/client-credentials.ts
index 41fbe23..6cf48d9 100644
--- a/lib/sdk/clients/server/client-credentials.ts
+++ b/lib/sdk/clients/server/client-credentials.ts
@@ -1,4 +1,4 @@
-import { default as withAuthUtilities } from './with-auth-utilities.js';
+import withAuthUtilities from './with-auth-utilities.js';
 import { type SessionManager } from '../../session-managers/index.js';
 import { ClientCredentials } from '../../oauth2-flows/index.js';
 import type { CCClientOptions } from '../types.js';
diff --git a/lib/sdk/clients/server/with-auth-utilities.ts b/lib/sdk/clients/server/with-auth-utilities.ts
index 554f2ee..fae130c 100644
--- a/lib/sdk/clients/server/with-auth-utilities.ts
+++ b/lib/sdk/clients/server/with-auth-utilities.ts
@@ -1,4 +1,4 @@
-import { SessionManager } from '../../session-managers';
+import { type SessionManager } from '../../session-managers';
 import * as utilities from '../../utilities/index.js';
 
 import type {
@@ -93,7 +93,7 @@ const withAuthUtilities = (
         `Cannot return claim "${claim}", no authentication credential found`
       );
     }
-    return tokenClaims.getClaimValue(sessionManager, claim, type);
+    return await tokenClaims.getClaimValue(sessionManager, claim, type);
   };
 
   /**
diff --git a/lib/sdk/utilities/token-claims.ts b/lib/sdk/utilities/token-claims.ts
index 3ad4411..4be1c89 100644
--- a/lib/sdk/utilities/token-claims.ts
+++ b/lib/sdk/utilities/token-claims.ts
@@ -1,5 +1,4 @@
 import { type SessionManager } from '../session-managers/index.js';
-import { isTokenExpired } from './token-utils.js';
 import { type ClaimTokenType } from './types.js';
 import { jwtDecode } from 'jwt-decode';
 
diff --git a/lib/sdk/utilities/token-utils.ts b/lib/sdk/utilities/token-utils.ts
index ec210bb..96ee783 100644
--- a/lib/sdk/utilities/token-utils.ts
+++ b/lib/sdk/utilities/token-utils.ts
@@ -133,5 +133,5 @@ export const isTokenExpired = (token: string | null): boolean => {
   const currentUnixTime = Math.floor(Date.now() / 1000);
   const tokenPayload = jwtDecode(token);
   if (!tokenPayload.exp) return true;
-  return currentUnixTime >= tokenPayload.exp!;
+  return currentUnixTime >= tokenPayload.exp;
 };