fix: onChange throw error handler sooner in instructions

fm-ph · Feb 13, 2017 · c64ef1c · c64ef1c
1 parent 8d6df62
commit c64ef1c
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/src/index.js b/src/index.js
@@ -112,6 +112,10 @@ class State {
    * @param {function} callback Callback
    */
   onChange (query, callback) {
+    if (typeof callback !== 'function') {
+      throw new TypeError('Signal.onChange() : Second argument must be a Function')
+    }
+
     const { container, containerId, splittedQuery } = this._parseStateQuery(query)
 
     let signalId = containerId
@@ -124,10 +128,6 @@ class State {
       container.signals[signalId] = new Signal()
     }
 
-    if (typeof callback !== 'function') {
-      throw new TypeError('Signal.onChange() : Second argument must be a Function')
-    }
-
     container.signals[signalId].add(callback)
   }