Other Environments

If you have a different environment that you want to integrate with, you can implement your middleware/handler like the example below.

GraphQL Yoga understands WHATWG Request object to consume your HTTP request. So you need an adapter implementation between your environment and WHATWG standard objects.


import { createServer } from '@graphql-yoga/common'
import { Request } from '@whatwg-node/fetch' // or fetch-like library
 
const yoga = createServer<MyRandomCtx>()
 
export async function myMiddleware(req: MyRandomRequest, ctx: MyRandomCtx) {
  // req.url is a full url here not a relative path
  const request = new Request(req.url, {
    method: req.method,
    headers: req.headers,
    body: req.body // req.body should be a valid BodyInit like an AsyncIterable, a ReadableStream, a Node.js Readable, a string or a Buffer etc...
  })
 
  // Second parameter becomes your server context
  const response = await yoga.handleRequest(req, ctx)
  // response is a WHATWG `Response` object
 
  // Create a headers object for your middleware response
  const headersObj: any = {}
 
  response.headers.forEach((value, key) => {
    headersObj[key] = value
  })
 
  // Let's say your environment needs to return something like the below;
  return {
    statusCode: response.status,
    body: response.body,
    // static responses will disable subscriptions
    // body: await response.text() If it accepts a string
    // body: await response.json() If it accepts a json
    // body: response.body if it accepts a ReadableStream or an AsyncIterable
    // body: Readable.from(response.body) if it accepts a Node.js Readable
    headers: headersObj // We assume that your environments accepts a regular JS object for response headers
  }
}