Single Lambda Function File Multiple Methods

multiple-methods.js

'use strict';

/*
  Sample Input:
  {
    "function": "template_function"
  }

*/

module.exports.handler = (event, context, callback) => {
    context.callbackWaitsForEmptyEventLoop = false;
    
    if (typeof event.function === "undefined") { 
        callback(new Error('function name is undefined'));
    }
    
    if (typeof this[event.function] !== "function") {
        callback(new Error(event.function + ' is not a valid function'));
    }
    
    try {
        this[event.function](event, callback);
    }
    catch (error) {
        callback(error); 
    }
    finally {
        console.log(event.function + ' done');
    }
    
};

module.exports.template_function = (event, callback) => {
    non_export_function('hello');
    callback(null, 'Hello from Lambda');
};

var non_export_function = (args) => {
  console.log('this is a local function');
};