thomaswilson-sveltekit/src/app.d.ts

/// <reference types="@sveltejs/kit" />
import type { PrismaClient } from '../generated/prisma/client.ts';

// See https://kit.svelte.dev/docs/types#app
// for information about these interfaces
declare global {
    namespace App {
        interface Locals {
            prisma: PrismaClient;
        }
        // interface Platform {}
        // interface Session {}
        // interface Stuff {}
    }
}