@as-integrations/cloudflare-workers/dist/index.js

An integration to use Cloudflare Workers as a hosting service with Apollo Server v4

import { HeaderMap, } from '@apollo/server';
export function startServerAndCreateCloudflareWorkersHandler(server, options) {
    server.startInBackgroundHandlingStartupErrorsByLoggingAndFailingAllRequests();
    const defaultContext = async () => ({});
    const contextFunction = options?.context ?? defaultContext;
    return async function cloudflareWorkersHandler(request, env, ctx) {
        try {
            if (request.method === 'OPTIONS') {
                return new Response('', { status: 204 });
            }
            const httpGraphQLRequest = await normalizeIncomingRequest(request);
            const { body, headers, status } = await server.executeHTTPGraphQLRequest({
                httpGraphQLRequest: httpGraphQLRequest,
                context: () => contextFunction({ request, env, ctx }),
            });
            if (body.kind === 'chunked') {
                throw Error('Incremental delivery not implemented');
            }
            return new Response(body.string, {
                status: status || 200,
                headers: {
                    ...Object.fromEntries(headers),
                    'content-length': Buffer.byteLength(body.string).toString(),
                },
            });
        }
        catch (e) {
            return new Response(e.message, { status: 400 });
        }
    };
}
async function normalizeIncomingRequest(request) {
    const headers = normalizeHeaders(request.headers);
    const url = new URL(request.url);
    const method = request.method.toUpperCase();
    return {
        method,
        headers,
        body: method === 'GET' ? request.body : await request.json(),
        search: url.search ?? '',
    };
}
function normalizeHeaders(headers) {
    const headerMap = new HeaderMap();
    headers.forEach((value, key) => {
        headerMap.set(key, Array.isArray(value) ? value.join(', ') : value);
    });
    return headerMap;
}
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