Timeout in async/await

async-await, node.js, promise, timeout, typescript

Solution

You can use `Promise.race` to make a timeout:

Promise.race([
    doSomethingInSeries(),
    new Promise((_, reject) => setTimeout(() => reject(new Error('timeout')), 11.5e3))
]).catch(function(err) {
    // errors in res1, res2, res3 and the timeout will be caught here
})

You cannot use `setTimeout` without wrapping it in a promise.

Problem

I'm with Node.js and TypeScript and I'm using `async/await`. This is my test case: ``` async function doSomethingInSeries() { const res1 = await callApi(); const res2 = await persistInDB(res1); const res3 = await doHeavyComputation(res1); return 'simle'; } ``` I'd like to set a timeout for the overall function. I.e. if `res1` takes 2 seconds, `res2` takes 0.5 seconds, `res3` takes 5 seconds I'd like to have a timeout that after 3 seconds let me throw an error. With a normal `setTimeout` call is a problem because the scope is lost: ``` async function doSomethingInSeries() { const timerId = setTimeout(function() { throw new Error('timeout'); }); const res1 = await callApi(); const res2 = await persistInDB(res1); const res3 = await doHeavyComputation(res1); clearTimeout(timerId); return 'simle'; } ``` And I cannot catch it with normal `Promise.catch`: ``` doSomethingInSeries().catch(function(err) { // errors in res1, res2, res3 will be catched here // but the setTimeout thing is not!! }); ``` Any ideas on how to resolve?

Original source