Node Roundup: Do We Need peerDependencies, lazy-install, Time Require

2014-04-16 00:00:00 +0100 by Alex R. Young

Do We Need peerDependencies?

Isaac Schlueter asked this question on Twitter:

Recently, peerDependencies has gotten more and more contentious. Srsly considering deprecation/removal. Thoughts? github.com/npm/npm/issues/5080

The discussion on Twitter and GitHub seems strongly for removing peerDependencies. I agree with it simply because I hate explaining how it works.

Eran Hammer made an interesting point about the idea of a compatibleWith property:

What we need is compatibleWith concept that simply warns you when you are using bad combinations. I think we can rename peerDeps and with some minor adjustment keep the functionality without annoying everyone. Making it a warning sign instead of a blocking feature would remove the "hell" part and those who chose to ignore warnings (as many already do with node versions) can continue to ignore.


If that isn't enough npm craziness for you, then how about this? lazy-install (GitHub: adamrenklint / lazy-install, License: MIT, npm: lazy-install) by Adam Renklint can be used to install dependencies based on "group" names.

Let's say you wanted to specify dependencies for your production and test environments. Your package.json could look like this:

  "name": "myProject",
  "lazyDependencies": {
    "server": {
      "express": "4.0.0"
    "test": {
      "mocha": "1.18.2"

Then in your code you can run lazy.install to trigger an npm install with the right options. In fact, the module itself is basically a wrapper around npm.

Time Require

Time Require

How much time did that require take to require? Now you can find out, with time-require! (GitHub: jaguard / time-require, License: MIT, npm: time-require).

It shows the execution time for each module by changing require, and then displaying the elapsed time for each file once the 'exit' event is emitted on the process object.

You can use it by adding a require('time-require') as the first line of your main script.