Integration with AWS Lambda

import { createYoga, createSchema } from 'graphql-yoga'
import { APIGatewayEvent, APIGatewayProxyResult, Context } from 'aws-lambda'
 
const yoga = createYoga<{
  event: APIGatewayEvent
  lambdaContext: Context
}>({
  // You need to specify the path to your lambda function
  graphqlEndpoint: '/my-lambda',
  schema: createSchema({
    typeDefs: /* GraphQL */ `
      type Query {
        greetings: String
      }
    `,
    resolvers: {
      Query: {
        greetings: () =>
          'This is the `greetings` field of the root `Query` type'
      }
    }
  })
})
 
export async function handler(
  event: APIGatewayEvent,
  lambdaContext: Context
): Promise<APIGatewayProxyResult> {
  const url = new URL(event.path, 'http://localhost')
  if (event.queryStringParameters != null) {
    for (const name in event.queryStringParameters) {
      const value = event.queryStringParameters[name]
      if (value != null) {
        url.searchParams.set(name, value)
      }
    }
  }
 
  const response = await yoga.fetch(
    url,
    {
      method: event.httpMethod,
      headers: event.headers as HeadersInit,
      body: event.body
        ? Buffer.from(event.body, event.isBase64Encoded ? 'base64' : 'utf8')
        : undefined
    },
    {
      event,
      lambdaContext
    }
  )
 
  const responseHeaders: Record<string, string> = {}
 
  response.headers.forEach((value, name) => {
    responseHeaders[name] = value
  })
 
  return {
    statusCode: response.status,
    headers: responseHeaders,
    body: await response.text(),
    isBase64Encoded: false
  }
}