walk angular 1.x scope tree

scopeWalker.js

function scopeWalker(scope, op) {
  var _walker = (scope) => {
    op(scope);
    var currentChildScope = scope.$$childHead;
    while(currentChildScope) {
      _walker(currentChildScope);
      currentChildScope = currentChildScope.$$nextSibling;
    }
  }
  _walker(scope);
}

function countWatchers(scope) {
  var count = 0;
  scopeWalker(scope, s => {
    if(s.$$watchers) {
      count += s.$$watchers.length;
      console.log(s.$$watchers.length);
    }
  });
  return count;
}

function $0Watchers() {
  return countWatchers($($0).scope());
}