I'm searching for the types for SvelteKit load function, especially for fetch. Can someone

When working with SvelteKit, I am utilizing the load function to make an API call. My aim is to utilize the fetch that is provided in the load function - however, my project is written in TypeScript.

I'm curious where I can find the type definitions for fetch, params, and other related properties?

    /** @type {import('./$types').PageLoad} */
    export async function load ({fetch}) {
    
      const rndInt = randomIntFromInterval(1, 20)
    
      const res = await fetch(`https://jsonplaceholder.typicode.com/todos/${rndInt}`)
      item = await res.json();
    
      return {item}
    }

Answer №1

When it comes to applying the type to the load function, the important thing is not where its component parts are defined. The key is that ./$types will be generated by the dev server and must be running for updates to be applied accurately.

To define the type for a function, the simplest way is to declare it as a const:

export const load: PageLoad = ({ fetch }) => {
    // fetch will automatically have the correct type here
}

The auto-generated types can be found in .svelte-kit/types/src/routes/..., with a hierarchy that mirrors the structure of the routes directory, allowing for easy import of ./$types.

The foundational types are specified in the @sveltejs/kit package, located at

node_modules/@sveltejs/kit/types/index.d.ts
. If your editor supports a "Go to definition" command, you can navigate through PageLoad and/or Kit.Load to explore further.

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