Nodejs check file exists, if not, wait till it exist

Question

I\'m generating files automatically, and I have another script which will check if a given file is already generated, so how could I implement such a function:

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Answer 1

function holdBeforeFileExists(filePath, timeout) {
   timeout = timeout < 1000 ? 1000 : timeout;
   return new Promise((resolve)=>{  
       var timer = setTimeout(function () {
           resolve();
       },timeout);

       var inter = setInterval(function () {
       if(fs.existsSync(filePath) && fs.lstatSync(filePath).isFile()){
           clearInterval(inter);
           clearTimeout(timer);
           resolve();
       }
     }, 100);
  });
}