countwatchers.js

function countWatchers(scope) {
    if (!scope) {
        return 0;
    }
  
    if (scope.vm) {
        let log = [scope.vm.__proto__.constructor.name, scope.$$watchers && scope.$$watchers.length]
        console.log(log.join(': '));
    }
  
    let watchCount = scope.$$watchers ? scope.$$watchers.length : 0
    
    if (scope.$$childHead) {
        watchCount += countWatchers(scope.$$childHead);
    }
    
    if (scope.$$nextSibling) {
        watchCount += countWatchers(scope.$$nextSibling);
    }
    
    return watchCount;
}

setInterval(() => console.log(countWatchers(angular.element("body").scope())), 3000)