edges-svelte/dist/server/EdgesHandle.js

A blazing-fast, extremely lightweight and SSR-friendly store for Svelte

import { stateSerialize } from '../store/State.svelte.js';
import { AsyncLocalStorage } from 'async_hooks';
import RequestContext, {} from '../context/Context.js';
const storage = new AsyncLocalStorage();
/**
 * Wraps request handling in an AsyncLocalStorage context and provides a `serialize` function
 * for injecting state into the HTML response.
 *
 * @param event - The SvelteKit RequestEvent for the current request.
 * @param callback - A function that receives the event and a serialize function,
 *   and returns a Response or a Promise of one.
 * @param silentChromeDevtools - If true, intercepts requests to
 *   `/.well-known/appspecific/com.chrome.devtools.json` (triggered by Chrome DevTools)
 *   and returns a 204 No Content response instead of a 404 error.
 */
export const edgesHandle = async (event, callback, silentChromeDevtools = false) => {
    return await storage.run({ event: event, symbol: Symbol(), data: { providers: new Map() } }, async () => {
        RequestContext.current = () => {
            const context = storage.getStore();
            if (context === undefined) {
                throw new Error('[Edge-S] State access attempted outside of a valid request context.\n' +
                    '\nThis usually happens if you are calling a provider or using `createState`/`createDerivedState` at the module (top) level.\n' +
                    '\n✅ Correct usage:\n' +
                    '  - Inside a `load` function (page.server.ts / page.ts)\n' +
                    '  - Inside Svelte components (in <script>)\n' +
                    '  - Inside `handle` hook or other request-scoped logic\n' +
                    '\n🚫 Incorrect usage:\n' +
                    '  - Calling providers or states directly at the top level of a module (e.g., outside any function or component)\n' +
                    '\nTo fix this, wrap your provider or state call inside a function, component, or request handler.\n');
            }
            return context;
        };
        if (silentChromeDevtools && event.url.pathname === '/.well-known/appspecific/com.chrome.devtools.json') {
            return new Response(null, { status: 204 });
        }
        return callback({
            edgesEvent: event,
            serialize: (html) => {
                if (!html)
                    return html ?? '';
                return html.replace('</body>', `${stateSerialize()}</body>`);
            }
        });
    });
};