Integration with AWS Lambda

import { createRouter, Response } from 'fets'
import { APIGatewayEvent, APIGatewayProxyResult, Context } from 'aws-lambda'
 
const router = createRouter<{
  event: APIGatewayEvent
  lambdaContext: Context
}>()
    .route({
        method: 'GET',
        path: '/greetings',
        schemas: {
            responses: {
                200: {
                    type: 'object',
                    properties: {
                        message: {
                            type: 'string'
                        }
                    },
          required: ['message'],
          additionalProperties: false
                }
            }
        } as const,
        handler: () => Response.json({ message: 'Hello World!' })
    })
 
export async function handler(
  event: APIGatewayEvent,
  lambdaContext: Context
): Promise<APIGatewayProxyResult> {
  const response = await router.fetch(
    event.path + '?' + new URLSearchParams(event.queryStringParameters as Record<string, string> || {}).toString(),
    {
    {
      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
  }
}