Heroku Deployment of node js - node.js

Question

So I am trying to deploy a discord bot through heroku but am having issues with the deployment.. everything works fine when I run my bot locally but when trying to deploy to heroku I get this:
2020-03-21T18:08:07.914594+00:00 heroku[worker.1]: Starting process with command node index.js
2020-03-21T18:08:08.476878+00:00 heroku[worker.1]: State changed from starting to up
2020-03-21T18:08:10.286392+00:00 heroku[worker.1]: State changed from up to crashed
2020-03-21T18:08:10.215281+00:00 app[worker.1]: internal/modules/cjs/loader.js:796
2020-03-21T18:08:10.215306+00:00 app[worker.1]: throw err;
2020-03-21T18:08:10.215307+00:00 app[worker.1]: ^
2020-03-21T18:08:10.215307+00:00 app[worker.1]:
2020-03-21T18:08:10.215307+00:00 app[worker.1]: Error: Cannot find module 'enmap'
2020-03-21T18:08:10.215308+00:00 app[worker.1]: Require stack:
2020-03-21T18:08:10.215308+00:00 app[worker.1]: - /app/index.js
2020-03-21T18:08:10.215323+00:00 app[worker.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:793:17)
2020-03-21T18:08:10.215324+00:00 app[worker.1]: at Function.Module._load (internal/modules/cjs/loader.js:686:27)
2020-03-21T18:08:10.215329+00:00 app[worker.1]: at Module.require (internal/modules/cjs/loader.js:848:19)
2020-03-21T18:08:10.215330+00:00 app[worker.1]: at require (internal/modules/cjs/helpers.js:74:18)
2020-03-21T18:08:10.215330+00:00 app[worker.1]: at Object. (/app/index.js:4:15)
2020-03-21T18:08:10.215330+00:00 app[worker.1]: at Module._compile (internal/modules/cjs/loader.js:955:30)
2020-03-21T18:08:10.215331+00:00 app[worker.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:991:10)
2020-03-21T18:08:10.215331+00:00 app[worker.1]: at Module.load (internal/modules/cjs/loader.js:811:32)
2020-03-21T18:08:10.215331+00:00 app[worker.1]: at Function.Module._load (internal/modules/cjs/loader.js:723:14)
2020-03-21T18:08:10.215331+00:00 app[worker.1]: at Function.Module.runMain (internal/modules/cjs/loader.js:1043:10) {
2020-03-21T18:08:10.215337+00:00 app[worker.1]: code: 'MODULE_NOT_FOUND',
2020-03-21T18:08:10.215337+00:00 app[worker.1]: requireStack: [ '/app/index.js' ]
2020-03-21T18:08:10.215337+00:00 app[worker.1]: }
2020-03-21T18:08:10.270170+00:00 heroku[worker.1]: Process exited with status 1
I have followed steps found at https://devcenter.heroku.com/articles/troubleshooting-node-deploys#ensure-you-aren-t-relying-on-untracked-dependencies. but still getting error.. the app log is saying the app is deployed but the bot is not coming online. I don't know what to do at this point. Any help or point to any article would be greatly helpful.
my package.json is here >
{
"name": "botname",
"version": "1.0.0",
"description": "botname Discord Server Bot",
"main": "index.js",
"start": "node .",
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Skemicle",
"license": "ISC",
"dependencies": {
"discord.js": "^11.5.1"
},
"engines": {
"node": "12.14.1",
"npm": "6.13.4"
}
}

Answer 1

"dependencies": {
"discord.js": "^11.5.1",
"enmap": "^5.2.4"
},
you have to add enmap to dependencies and if you are using other npm libraries you have to add that to dependencies also because heroku installs dependencies via npm install and that downloads packages listed in package.json -> dependencies.