Recursive function in typescript-CodePudding

I have a project in Node JS with Typescript in which I am creating a function to check that a file exists, this check returns a boolean.

I have another function timeOut() to wait a while before checking that it has arrived, when it checks if it is true the process continues, if it is false I need it to check again if the file exists after the defined time

This is what I have:

function sleepTimeout(interval) {
  return new Promise((resolve) => {
    setTimeout(resolve, interval);
  });
};

async function testData(data) {

  await sleepTimeout(2000);

  if (data == false) {
    console.log('KO')
  } else {
    console.log('OK')
  }

}

testData(true)

It only does a check, how can I make the function redo the if after the timeOut until the boolean is true

CodePudding user response：

You can use async/await to make sure the function is done before starting again, and a while loop :

async function testData(data) {
  while (!data) {
    await sleepTimeout(2000);
    data = await checkFileExists(); // replace this with your function to check if the file exists
  }
  console.log('OK');
}

testData(checkFileExists());