slow-deps to Measure NPM Install Time

By  on  

The ability to quickly add dependencies to an npm project is a gift a curse -- the curse being you oftentimes have no control over those dependencies being available (i.e. the left-pad situation) and the have the potential to bloat your application or even increase project download time.  The truth is we should really be careful about what we depend on.

I recently found an awesome utility for measuring dependency download time and dependencies to dependencies:  slow-deps.  Start by installing slow-deps:

npm install -g slow-deps

After installed, navigate to the directory which hosts package.json and run slow-deps; the result will look something like this:

# Test Repo:  aframe

$ slow-deps
Analyzing 45 dependencies...
[====================] 100% 0.0s
---------------------------------------------------------------
| Dependency                    | Time     | Size    | # Deps |
---------------------------------------------------------------
| semistandard                  | 1m 14.4s | 24 MB   | 242    |
| tween.js                      | 1m 10.7s | 22 MB   | 250    |
| budo                          | 1m 1.4s  | 14 MB   | 275    |
| mozilla-download              | 49.3s    | 26 MB   | 194    |
| karma                         | 39.8s    | 16 MB   | 153    |
| snazzy                        | 36.2s    | 9.7 MB  | 146    |
| karma-coverage                | 26.7s    | 8.0 MB  | 99     |
| browserify                    | 23s      | 6.4 MB  | 118    |
| codecov                       | 17.8s    | 3.9 MB  | 73     |
| istanbul                      | 12.1s    | 6.5 MB  | 55     |
| minifyify                     | 11.4s    | 4.8 MB  | 48     |
| browserify-css                | 10.7s    | 4.0 MB  | 29     |
| document-register-element     | 9.7s     | 62 KB   | 0      |
| browserify-derequire          | 9.5s     | 1.7 MB  | 42     |
| mocha                         | 7.2s     | 1.3 MB  | 34     |
| gh-pages                      | 6.2s     | 3.7 MB  | 22     |
| three                         | 5.5s     | 10.0 MB | 0      |
| sinon                         | 5.3s     | 1.0 MB  | 5      |
| karma-browserify              | 5.2s     | 1.0 MB  | 9      |
| webvr-polyfill                | 4.2s     | 898 KB  | 2      |
| karma-mocha-reporter          | 4s       | 104 KB  | 7      |
| uglifyjs                      | 3.9s     | 752 KB  | 6      |
| rimraf                        | 3.6s     | 157 KB  | 11     |
| karma-sinon-chai              | 3.2s     | 146 KB  | 1      |
| replace                       | 3s       | 341 KB  | 7      |
| chai                          | 2.8s     | 438 KB  | 3      |
| karma-mocha                   | 2.8s     | 18 KB   | 0      |
| karma-chrome-launcher         | 2.6s     | 56 KB   | 5      |
| browserify-istanbul           | 2.5s     | 84 KB   | 5      |
| exorcist                      | 2.5s     | 143 KB  | 6      |
| lolex                         | 2.3s     | 122 KB  | 0      |
| karma-env-preprocessor        | 2.2s     | 5.8 KB  | 0      |
| mkdirp                        | 2s       | 47 KB   | 2      |
| chai-shallow-deep-equal       | 2s       | 17 KB   | 0      |
| husky                         | 2s       | 14 KB   | 1      |
| karma-firefox-launcher        | 1.9s     | 13 KB   | 0      |
| deep-assign                   | 1.9s     | 11 KB   | 1      |
| sinon-chai                    | 1.9s     | 18 KB   | 0      |
| debug                         | 1.5s     | 37 KB   | 1      |
| object-assign                 | 1.3s     | 7.4 KB  | 0      |
| open                          | 1.3s     | 26 KB   | 0      |
| karma-chai-shallow-deep-equal | 1.2s     | 6.8 KB  | 0      |
| present                       | 1.1s     | 12 KB   | 0      |
| promise-polyfill              | 1.1s     | 17 KB   | 0      |
| style-attr                    | 1s       | 6.5 KB  | 0      |
---------------------------------------------------------------
Total time (non-deduped): 9m 2s
Total size (non-deduped): 167 MB

You can see that there are a few dependencies which really slow down the install process due to a massive amount of its own dependencies.  Yikes!

So what can you do?  You can look for alternative packages which perform the same function but possible more dependencies.  If you aren't running npm install often (i.e. not deploying often), maybe this install time isn't a big deal; if you are, however, it's good to know the bottlenecks!

Recent Features

  • By
    CSS @supports

    Feature detection via JavaScript is a client side best practice and for all the right reasons, but unfortunately that same functionality hasn't been available within CSS.  What we end up doing is repeating the same properties multiple times with each browser prefix.  Yuck.  Another thing we...

  • By
    Camera and Video Control with HTML5

    Client-side APIs on mobile and desktop devices are quickly providing the same APIs.  Of course our mobile devices got access to some of these APIs first, but those APIs are slowly making their way to the desktop.  One of those APIs is the getUserMedia API...

Incredible Demos

  • By
    CSS Fixed Position Background Image

    Backgrounds have become an integral part of creating a web 2.0-esque website since gradients have become all the rage. If you think gradient backgrounds are too cliche, maybe a fixed position background would work for you? It does provide a neat inherent effect by...

  • By
    Using Opacity to Show Focus with jQuery

    A few days back I debuted a sweet article that made use of MooTools JavaScript and opacity to show focus on a specified element. Here's how to accomplish that feat using jQuery. The jQuery JavaScript There you have it. Opacity is a very simple but effective...

Discussion

  1. It’s important to note that slow-deps calculates times without considering npm’s local cache.
    In normal use npm packages are stored in your local .npm cache to avoid repeat downloads.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!