const rest = new sst.Api(this, "rest", {
      routes: {
        "POST /slack": "services/rest/slack.handler",
      },
    })

    this.addOutputs({
      AppSync: appsync.url,
      Rest: rest.url,
    })

import { APIGatewayProxyHandlerV2 } from "aws-lambda"
import { App, AwsLambdaReceiver } from "@slack/bolt"

const awsLambdaReceiver = new AwsLambdaReceiver({
  signingSecret: "<>",
})

// Initializes your app with your bot token and the AWS Lambda ready receiver
const app = new App({...})

app.event("message", async (event) => {...})

export const handler: APIGatewayProxyHandlerV2 = async (
  event,
  context,
  callback
) => {
  const handler = (await app.start()) as any
  return handler(event, context, callback)
}