Switch to simple null check and shortcircuit bind

lib/dispatcher-base.js

@@ -130,23 +130,6 @@ class DispatcherBase extends Dispatcher {
     })
   }
 
-  get [kInterceptedDispatch] () {
-    let dispatch = this[kDispatch].bind(this)
-    for (let i = this[kInterceptors].length - 1; i >= 0; i--) {
-      const interceptor = this[kInterceptors][i]
-      if (typeof interceptor !== 'function') {
-        throw new InvalidArgumentError('interceptor must be an function')
-      }
-      dispatch = interceptor(dispatch)
-    }
-
-    // Overwrite this getter with a cached value
-    Object.defineProperty(this, kInterceptedDispatch, {
-      value: dispatch
-    })
-    return dispatch
-  }
-
   dispatch (opts, handler) {
     if (!handler || typeof handler !== 'object') {
       throw new InvalidArgumentError('handler must be an object')
@@ -165,6 +148,25 @@ class DispatcherBase extends Dispatcher {
         throw new ClientClosedError()
       }
 
+      if (!this[kInterceptedDispatch]) {
+        function buildInterceptedDispatch () {
+          if (!this[kInterceptors] || this[kInterceptors].length === 0) {
+            return this[kDispatch]
+          }
+
+          let dispatch = this[kDispatch].bind(this)
+          for (let i = this[kInterceptors].length - 1; i >= 0; i--) {
+            const interceptor = this[kInterceptors][i]
+            if (typeof interceptor !== 'function') {
+              throw new InvalidArgumentError('interceptor must be an function')
+            }
+            dispatch = interceptor(dispatch)
+          }
+          return dispatch
+        }
+        this[kInterceptedDispatch] = buildInterceptedDispatch.call(this)
+      }
+
       return this[kInterceptedDispatch](opts, handler)
     } catch (err) {
       if (typeof handler.onError !== 'function') {