The error is not refering to myfunction
but to start
.
async function start() { .... const result = await helper.myfunction('test', 'test'); }
// My function const myfunction = async function(x, y) { return [ x, y, ]; } // Start function const start = async function(a, b) { const result = await myfunction('test', 'test'); console.log(result); } // Call start start();
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I use the opportunity of this question to advise you about an known anti pattern using await
which is : return await
.
WRONG
async function myfunction() { console.log('Inside of myfunction'); } // Here we wait for the myfunction to finish // and then returns a promise that'll be waited for aswell // It's useless to wait the myfunction to finish before to return // we can simply returns a promise that will be resolved later // useless async here async function start() { // useless await here return await myfunction(); } // Call start (async() => { console.log('before start'); await start(); console.log('after start'); })();
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CORRECT
async function myfunction() { console.log('Inside of myfunction'); } // Here we wait for the myfunction to finish // and then returns a promise that'll be waited for aswell // It's useless to wait the myfunction to finish before to return // we can simply returns a promise that will be resolved later // Also point that we don't use async keyword on the function because // we can simply returns the promise returned by myfunction function start() { return myfunction(); } // Call start (async() => { console.log('before start'); await start(); console.log('after start'); })();
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Also, know that there is a special case where return await
is correct and important : (using try/catch)