modules to git when creating a node.js app on Heroku?
I followed the basic getting started instructions for node.js on Heroku here:
https://devcenter.heroku.com/categories/nodejs
These instruction don't tell you to create a .gitignore node_modules, and therefore imply that node_modules should be checked in to git. When I include node_modules in git my getting started application ran correctly.
When I followed the more advanced example at:
https://devcenter.heroku.com/articles/realtime-polyglot-app-node-ruby-mongodb-socketio https://github.com/mongolab/tractorpush-server (source)
It instructed me to add node_modules to .gitignore. So I removed node_modules from git, added it to .gitignore, then re-deployed. This time the deployed failed like so:
-----> Heroku receiving push
-----> Node.js app detected
-----> Resolving engine versions
Using Node.js version: 0.8.2
Using npm version: 1.0.106
-----> Fetching Node.js binaries
-----> Vendoring node into slug
-----> Installing dependencies with npm
Error: npm doesn't work with node v0.8.2
Required: node@0.4 || 0.5 || 0.6
at /tmp/node-npm-5iGk/bin/npm-cli.js:57:23
at Object.<anonymous> (/tmp/node-npm-5iGk/bin/npm-cli.js:77:3)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/tmp/node-npm-5iGk/cli.js:2:1)
at Module._compile (module.js:449:26)
Error: npm doesn't work with node v0.8.2
Required: node@0.4 || 0.5 || 0.6
at /tmp/node-npm-5iGk/bin/npm-cli.js:57:23
at Object.<anonymous> (/tmp/node-npm-5iGk/bin/npm-cli.js:77:3)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:362:17)
at require (module.js:378:17)
at Object.<anonymous> (/tmp/node-npm-5iGk/cli.js:2:1)
at Module._compile (module.js:449:26)
Dependencies installed
-----> Discovering process types
Procfile declares types -> mongod, redis, web
-----> Compiled slug size is 5.0MB
-----> Launching... done, v9
Running "heroku ps" confirms the crash. Ok, no problem, so I rolled back the change, add node_module back to the git repository and removed it from .gitignore. However, even after reverting, I still get the same error message on deploy but now the application is running correctly again. Running "heroku ps" tells me the application is running.
So my question is what's the right way to do this? Include node_modules or not? And why would I still be getting the error message when I rollback? My guess is the git repository is in a bad state on the Heroku side?
Second Update
The FAQ is not available anymore.
From the documentation of shrinkwrap :
If you wish to lock down the specific bytes included in a package, for example to have 100% confidence in being able to reproduce a deployment or build, then you ought to check your dependencies into source control, or pursue some other mechanism that can verify contents rather than versions.
Shannon and Steven mentioned this before but I think, it should be part of the accepted answer.
Update
The source listed for the below recommendation has been updated. They are no longer recommending the node_modules folder be committed.
Usually, no. Allow npm to resolve dependencies for your packages.
For packages you deploy, such as websites and apps, you should use npm shrinkwrap to lock down your full dependency tree:
https://docs.npmjs.com/cli/shrinkwrap
Original Post
For reference, npm FAQ answers your question clearly:
Check node_modules into git for things you deploy, such as websites and apps. Do not check node_modules into git for libraries and modules intended to be reused. Use npm to manage dependencies in your dev environment, but not in your deployment scripts.
and for some good rationale for this, read Mikeal Rogers' post on this.
Source: https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
My biggest concern with not checking node_modules into git is that 10 years down the road, when your production application is still in use, npm may not be around. Or npm might become corrupted; or the maintainers might decide to remove the library that you rely on from their repository; or the version you use might be trimmed out.
This can be mitigated with repo managers like maven, because you can always use your own local Nexus or Artifactory to maintain a mirror with the packages that you use. As far as I understand, such a system doesn't exist for npm. The same goes for client-side library managers like Bower and Jamjs.
If you've committed the files to your own git repo, then you can update them when you like, and you have the comfort of repeatable builds and the knowledge that your app won't break because of some third-party action.
You should not include node_modules in your .gitignore (or rather you should include node_modules in your source deployed to Heroku).
If node_modules :
npm install will use those vendored libs and will rebuild any binary dependencies with npm rebuild . npm install will have to fetch all dependencies itself which adds time to the slug compile step. See the Node.js buildpack source for these exact steps
However, the original error looks to be an incompatibility between the versions of npm and node . It is a good idea to always explicitly set the engines section of your packages.json according to this guide to avoid these types of situations:
{
"name": "myapp",
"version": "0.0.1",
"engines": {
"node": "0.8.x",
"npm": "1.1.x"
}
}
This will ensure dev/prod parity and reduce the likelihood of such situations in the future.
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