docs: function (context, callback) {
        if (!this.waiters) {
          return;
        }
        if (arguments.length === 1) {
          callback = context;
          context = null;
        }
        this.waiters = _emberRuntimeSystemNative_array.A(this.waiters.filter(function (elt) {
          return !(elt[0] === context && elt[1] === callback);
        }));
      }