Find a needle in the global haystack of nested junk

needle-in-global-haystack.js

const findNeedleInHaystack = (needle, haystack) => {
	let reference = [];
	let promises = [];
	const finder = (obj, chain) => {
		return new Promise((resolve, reject)=>{
			if (reference.includes(obj)) {
				return resolve(chain.join('.')); // already checked this object
			}
			// add object as "checked" to reference registry
			reference.push(obj);
			let nextChain;
			for (let prop in obj) {
				nextChain = chain.map(val => val);
				nextChain.push(prop);
				try {
					if (typeof obj[prop] === 'object' && obj[prop] && obj[prop].constructor && (obj[prop].constructor.name === 'Window' || obj[prop] instanceof Window)) { continue; }
					if (typeof obj[prop] === 'object') {
						promises.push(finder(obj[prop], nextChain));
					} else if(typeof obj[prop] === 'string') {
						if(obj[prop].indexOf(needle) !== -1) {
							console.warn('FOUND', nextChain.join('.'), obj.constructor.name);
						}
					}
				} catch (ex) {
					console.info(nextChain.join('.'), ex.message);
				}
			}
			resolve(chain.join('.'));
		});
	};

	promises.push(finder(haystack, [haystack.constructor.name]));

	Promise.all(promises).then((results)=>{
		console.log(reference.length);
//		console.log(results);
	});
}

window.tier1 = {
	tier2: [
		{},
		{},
		{ 
			tier3: { 
				thing: 'Chrome'
			}
		}
	]
};

findNeedleInHaystack('Chrome', window);