fix: custom token error

src/index.js

@@ -38,6 +38,10 @@ class UniID {
     })
   }
 
+  setInterceptor (timing, handler) {
+    this.interceptorMap.set(timing, handler)
+  }
+
   _t (...args) {
     return this._i18n.t(...args)
   }

src/lib/token/utils.js

@@ -187,7 +187,7 @@ export async function createTokenInternal ({
     })
   }
   const customToken = this.interceptorMap.get('customToken')
-  if (typeof customToken === 'function') {
+  if (typeof customToken !== 'function') {
     throw new Error('Invalid custom token file')
   }