#!/opt/bin/node

const fs = require('fs')

const CoffeeScript = require('coffeescript')

// We'll set this so all later .coffee files we require() are

// compiled/transpiled automatically.

CoffeeScript.register()

// bootstrap.coffee is our port of the node-custom-lambda (https://github.com/

// lambci/node-custom-lambda) bootstrap.js. This file handles the lifecycle of

// the lambda. Note: when a lambda runs this file, the cwd() is /var/task

const bootstrap = '/opt/bootstrap.coffee'

// These are options we pass to the CoffeeScript compiler.

const options = {

bare: true,

header: false,

sourceMap: false,

inlineMap: false,

// Due to our execution happening inside /var/task but our babel.config.js

// located in /opt, the transpilation step could never find our babel config

// and would fail. We needed to pass the "root" option to babel to fix this

// but the coffeescript cli --transpile option was unfortunately just a

// boolean flag.

// The workaround was to run our bootstrap.coffee using the coffescript

// nodeJS api instead (hence this file is a nodeJS script) where it is

// possible to pass the required 'root' option.

transpile: { root: '/opt/' }

}

fs.readFile(bootstrap, 'utf8', (err, data) => {

if (err) {

throw new Error(`Could not find ${bootstrap}: ${err.code} ${err.message}`);

}

// Unlike your everyday coffeescript workflow, we're not writing the

// compiled output to disk but rather evaluated on the fly. The result is

// that we can save a few millisecs by skipping the i/o.

CoffeeScript.run(data, options);

});