as an example, here’s a lambda handler file:

import Koa                  from 'koa';
import bodyParser           from 'koa-bodyparser';
import serverless           from 'serverless-http';
import { isDev }            from 'serverless-boost/app';
import { processRequest }   from 'serverless-boost/lambda/request';
import { createContext }    from '../app';
import endpoints            from '../web';

// init the global context
const context = createContext();

// init the app
const web = new Koa();

// plumb the web stack
web
  .use(bodyParser());

// log the requests
web.use(function(ctx, next) {
  console.log(`${ctx.method} ${ctx.path}`);
  return next();
});

// inject the global context into the request ctx state
web.use(function(ctx, next) {
  ctx.state = context;
  return next();
});

// attach endpoints
for (let { handle: attach } of endpoints) {
  attach(web);
}

// run the serverless stack directly
export const main = processRequest(serverless(web));

but mostly at the top, you can see

sourceMap.install()

then I created a simple handler to bonk so I could see the backtrace in the output logs

it basically fixes stacktraces?

I might not have it configured…

yep, it wasn’t configured. I was looking at the wrong project. Now I’m trying…

source-map-support

basically fixes the default error stack backtrace to walk back through the source maps and get to the original source. So when you’re seeing the stack trace it’s the actual source, whether typescript, javascript, coffeescript, etc before it was compiled and minified.

ok that works when it’s actually configured haha

and cool, I might start using that as well

so now my error message looks like this:

ReferenceError: bonk is not defined
      at /src/web/status.js:14:5

instead of this:

ReferenceError: bonk is not defined
      at /var/task/src/lambda/web.js:28593:5

which is the correct location in the original source 💪