I have this simple example to my controller and doesn't work as expected
export let create = async (req: Request, res: Response) => {
console.log("START");
await setTimeout(() => {
console.log("MIDDLE");
}, 1000);
console.log("END");
return res.json({ data: null });
};
Output: START,END,MIDDLE
EXPECT: START,MIDDLE,END
try:
await new Promise(resolve => setTimeout(resolve, 1000))
You're using setTimeOut without creating the promise object, so it's waiting for the setTimeOut value to be returned (which is instant) rather than waiting for a promise resolution. This is the reason your await statement isn't working the way it was intended to. What you need is to create a promise:
function resolveAfterOneSecond(x) {
return new Promise(resolve => {
setTimeout(() => {
console.log("Middle");
resolve(x);
}, 1000);
});
}
async function f1() {
var x = await resolveAfterOneSecond(10);
console.log("End");
}
console.log("Begin");
f1();
and then set your function to await the return of the promise, rather than the return of the setTimeOut function integer.
setTimeoutreturns a number, not a promise. Only if youawaita promise does the execution actually "wait".