sync-function-to-async.js

// https://stackoverflow.com/a/44330807/713573

(async () => {
  // sync function
  function syncFunc (opts) {
    return 'done';
  }

  const asyncSyncFunc = async (params) => {
    return syncFunc(params);
  };  

  const result = await asyncSyncFunc();
  console.log(result);

  // sync function throws error
  function buggySyncFunc (opts) {
    throw new Error('Sync is buggy');
  }

  const asyncBuggySyncFunc = async (params) => {
    return buggySyncFunc(params);
  };  

  try {
    const result = await asyncBuggySyncFunc();
    console.log('Should not execute.');
  } catch (error) {
    console.log(error.message);
  }
})()