javascript find directory root

JavaScript
function findRoot1(args=dir_stack) {
      		args.pop();
  			// This is on windows
            let str = args.join("\\");
  
  			// search for the package.json
            let str1 = str.concat("\\package.json");
            if (!args || args.length === 0) {
                return;
            }
  				
  			// check if what you found is a real
            if (fs.existsSync(str1)) {
                projectDir = str;
                return projectDir;
            }else{
              	// if not then recurse;
                return findRoot1(args);
            }
        }
Source

Also in JavaScript: