Using “await” inside non-async function

Question

I have an async function that runs by a setInterval somewhere in my code. This function updates some cache in regular intervals.

I also have a different, synchronous

Answer 1

You can call an async function from within a non-async function via an Immediately Invoked Function Expression (IIFE):

(async () => await updateCacheForKey([key]))();

And as applied to your example:

function syncFunc(key) {
   if (!(key in cache)) {
      (async () => await updateCacheForKey([key]))();
   }
}

async function updateCacheForKey(keys) {
   // updates cache for given keys
   ...
}