index.js

const { execSync } = require('child_process');
const fs = require("fs");

let read = fs.readFileSync('index.js'); //reading myself
let code = read.toString();

let requireRegex = /=\s*require\s*\(['\"](.+)['\"]\)/g;
let match = requireRegex.exec(code);

while (match != null) {
    let lib = match[1];
    match = requireRegex.exec(code);
    if (lib === 'child_process' || lib === 'fs') {
        continue;
    }
    
    execSync(`npm install --prefix /tmp --save ${lib}`);
}

let oldRequire = require;
require = function(module) {
    return oldRequire(`/tmp/node_modules/${module}`);
}

/* JUST FORGET EVERYTHING AND START YOUR CODE FROM THIS POINT ONWARDS*/

let reverseString = require('reverse-string');
let mathjs = require('mathjs');

exports.handler = (event, context, callback) => {
    callback(null, reverseString(' = evitavired')+mathjs.derivative('x^2 + x', 'x'));
};