find key or value from an object recursively

scanObject.js

(function(){
  const target = window;
  const search = /search/;
  const type = {
    key: true,
    value: true,
  };
  const scan = function(t, path = '', chain = [t]){
    //console.log(path);
    switch(true){
      case(isWindow(t)):
      case(isObject(t)):
        if(type.key === true) Object.keys(t).forEach(key => {
          if(search.test(key)) console.log('Found key:', path + '.' + key, t[key]);
        });
        Object.keys(t).filter(key => chain.every(c => c !== t[key])).forEach(key => scan(t[key], path + '.' + key, [...chain, t[key]]));
        break;
      case(isArray(t)):
        t.filter(v => chain.every(c => c !== v)).forEach((v, i) => scan(v, path + '[' + i + ']', [...chain, v]));
        break;
      case(isFunction(t)):
        if(type.value === true){
          if(search.test(t.name)) console.log('Found value:', path, t);
        }
        break;
      case(isString(t)):
      case(isNumber(t)):
        if(type.value === true){
          if(search.test(t)) console.log('Found value:', path, t);
        }
        break;
      default:
        break;
    }
  };
  /* isObject by https://chaika.hatenablog.com/entry/2019/08/16/083000 */
  const isWindow = (x) => (x === window);
  const isObject = (x) => (x !== null) && (typeof x === 'object') && (x.constructor === Object);
  const isArray = (x) => Array.isArray(x);
  const isFunction = (x) => (typeof x === 'function');
  const isString = (x) => (typeof x === 'string');
  const isNumber = (x) => (typeof x === 'number');
  scan(target);
})();