Worker GraphQL

GraphQL server for worker environments (e.g. Cloudflare Workers).

GraphQL on Workers was inspired by this blog post, but using Apollo Server has a massive bundle size or can't bundle due to dependency on graphql-upload (a node.js dependency). Using worker-graphql resulted in a build of < 50KB.

Installation

npm install @borderless/worker-graphql --save

Usage

import { processGraphQL } from "@borderless/worker-graphql";
import { makeExecutableSchema } from "graphql-tools";

const schema = makeExecutableSchema({
  typeDefs: `
    type Query {
      hello: String
    }
  `,
  resolvers: {
    Query: {
      hello: () => "Hello world!",
    },
  },
});

// Wrap `processGraphQL` with CORS support.
const handler = async (req: Request) => {
  if (req.method.toUpperCase() === "OPTIONS") {
    return new Response(null, {
      status: 204,
      headers: {
        "Access-Control-Allow-Methods": "GET,POST",
        "Access-Control-Allow-Headers":
          req.headers.get("Access-Control-Request-Headers") || "Content-Type",
        "Access-Control-Allow-Origin": "*",
      },
    });
  }

  const res = await processGraphQL(req, { schema });
  res.headers.set("Access-Control-Allow-Origin", "*");
  return res;
};

addEventListener("fetch", (event) => {
  event.respondWith(handler(event.request));
});

License

MIT