How to fetch initial values for session in svelte/sapper

Question

I am using svelte/sapper with polka. I have some initial values to be fetched and stored in session from a web service before any page is loaded. What is the best recommended way to do this.

I tried doing this in _layout in the root. But as the fetch is asynchronous, values are not available in the first page load.

Answer 1

Your layout components can use preload: https://sapper.svelte.dev/docs#Preloading