Is it safe to remove the `async` keyword if there are no `await` statements in use

Forgive me if this is a silly question, but I'm considering removing the async function below since there are no await's. This code is part of a large production system, and I'm unsure if removing async could have unexpected consequences?

(async function(){
  'use strict';
  const {appLogger, monitorLogger} = require('./functions/logger');

...

  for (let i in p) {
    p[i].Filename = i;
    check(p[i]);
  }

...
    
  app.get('/example.json', (req, res) => {
    res.send(JSON.stringify(checkStates, null, 4));
  })

  app.listen(port, () => {
    appLogger.info(`Exposing http://localhost:${port}/example.json`);
  })

})();

Answer №1

One consideration is that the await keyword may encapsulate any non-promise return value with a promise. In this scenario, the function being self-invoked does not appear to have any return statements or expectations for one. Barring any undisclosed code snippets, it seems like you are on the right track.

Answer №2

Absolutely, you have the option to omit the async keyword in this scenario.

Answer №3

There is no need to use async if you are not waiting for any promises.

Answer №4

Affirmative, there may be potential side effects to consider. The use of the async keyword within a function alters its return value to a promise, which can impact the behavior in other parts of your code. This change can lead to differing results before and after removing the async keyword.

const fn = () => 10
const afn = async () => 10

afn() // returns a Promise
fn() // returns a number

afn().then(() => {}) // works as expected
fn().then(() => {}) // throws an error

In your specific scenario, no worries - this modification won't result in any changes.

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