firebase-frameworks/dist/sveltekit/index.js

Experimental addon to the Firebase CLI to add web framework support

import { pathToFileURL } from "url";
import { installPolyfills } from "@sveltejs/kit/node/polyfills";
const kitPromise = import(`${pathToFileURL(process.cwd())}/index.js`);
const manifestPromise = import(`${pathToFileURL(process.cwd())}/manifest.js`);
// Request, Response, fetch, etc.
installPolyfills();
const server = Promise.all([kitPromise, manifestPromise]).then(async ([{ Server }, { manifest }]) => {
    const server = new Server(manifest);
    await server.init({ env: process.env });
    return server;
});
export const handle = async (req, res) => {
    const rendered = await (await server).respond(toSvelteKitRequest(req));
    if (!rendered) {
        return res.writeHead(404, "Not Found").end();
    }
    const body = await rendered.arrayBuffer();
    return res
        .writeHead(rendered.status, Object.fromEntries(rendered.headers))
        .end(Buffer.from(body));
};
// https://github.com/jthegedus/svelte-adapter-firebase/blob/main/src/files/firebase-to-svelte-kit.js
function toSvelteKitRequest(request) {
    // Firebase sometimes omits the protocol used. Default to http.
    const protocol = request.headers["x-forwarded-proto"] || "http";
    // Firebase forwards the request to sveltekit, use the forwarded host.
    const host = `${protocol}://${request.headers["x-forwarded-host"]}`;
    const { href } = new URL(request.url || "", host);
    return new Request(href, {
        method: request.method,
        headers: toSvelteKitHeaders(request.headers),
        body: request.rawBody ? request.rawBody : null,
    });
}
function toSvelteKitHeaders(headers) {
    const finalHeaders = {};
    // Assume string | string[] types for all values
    for (const [key, value] of Object.entries(headers)) {
        if (value) {
            finalHeaders[key] = Array.isArray(value) ? value.join(",") : value;
        }
    }
    return finalHeaders;
}