Vercel and maxDuration (also BUG in Vercel documentation)

[kyllerss]

I have a single SvelteKit app deployed on Vercel. The app is deployed as a single function. Most of the endpoints are accessed by the the app client, so a short response duration (say 20 seconds) is what I need. However, I have other endpoints that are triggered by cron jobs that should run for 5 minutes and have different memory settings.

The documentation states that I can set the maxDuration configuration in the vercel adapter in svelte.config.js. How can I override the maxDuration for these cron jobs?

As a side note, I saw that the documentation states:

While Vercel specifies defaults for the maximum duration of a function, you can also override it in your vercel.json file with:

This glob pattern will match everything in the specified path, so you may wish to be more specific by adding a file type, such as app/api/**/*.ts instead.

The above is the resulting information when you select SvelteKit from the code sample dropdown selector - the code sample it references is missing for SvelteKit. Assuming I read in-between the lines, is the glob pattern that goes into the vercel.json file applicable to individual files even if the app is deployed as a single function? I haven't had much success changing the maxDuration value on anything other than the global setting in the adapter.

Also, there is the SvelteKit adapter-vercel documentation that refers to overriding the configuration at a granular level using exports, but I have been unable to have those changes override the global maxDuration setting.

Any suggestions greatly appreciated!

[Rishab49]

Do you have vercel pro or enterprise subscription?

[kyllerss]

Yes, I do.

[kyllerss]

Any updates?

[jhoddevik]

I changed from @sveltejs/adapter-auto to @sveltejs/adapter-vercel, and then I got it working.

import adapter from '@sveltejs/adapter-vercel';
export default {
	kit: {
		adapter: adapter({
			maxDuration: 300,
		})
	}
};

[kyllerss]

Yup. I'm using the Vercel adapter too. I can specify global timeouts just like you did. The problem is that I can't override it at a function-level (which the documentation states one can do).

[jhoddevik]

Ah, yes. I gave up on the glob pattern. I was just happy to get the global value to work

[demanzonderjas]

From the Svelte documentation, the current solution is now to export a config object from your +server.js, +page(.server).js and +layout(.server).js (or .ts):

import type { Config } from '@sveltejs/adapter-vercel';

export const config: Config = {
	maxDuration: 100
};

[eltigerchino]

Also, there is the SvelteKit adapter-vercel documentation that refers to overriding the configuration at a granular level using exports, but I have been unable to have those changes override the global maxDuration setting.

The route level config should override the adapter config.

kit/packages/adapter-vercel/index.js

Line 234 in 9fbfb22

const config = { runtime, ...defaults, ...route.config };

https://svelte.dev/docs/kit/adapter-vercel#Deployment-configuration