![]() create PNG, PDF, GIF, or DOT files in a designated directory.show dependencies between inputs, outputs, and other preconditions.show relationship between inputs, tasks, and outputs.Generate graphviz diagrams for flow definitions that: #REACT GRAPHVIZ INSTALL#Fortunately, you can install dependency-cruiser as a local dependency in your project, and then add an npm script to package.React-graphviz is a plugin for react, the flow control rules engine, which can use graphviz to generate flow diagrams for the dependenciesįor more information on react the lightweight flow control rules engine: Goals Continuous Visual Documentationīeing Netlify, we of course want to explore how we can make this visualization continuously updated. Tweak the command line accordingly for exploring further. Isn't that gorgeous?! But more importantly, if I am contributing to the top level files for React, I can look ahead to see where all my dependencies are in relation to what I am working on. I'd print that out and put it on my wall, but it's certainly not a very useful map! Here's where you run it with the max-depth flag:ĭepcruise -max-depth 2 -exclude "^(node_modules|forks|_tests_)" -output-type dot packages/react/src | dot -T svg > dependencygraph.svg Here's the core React package ( packages/react, without react-dom): This can be fine especially since Preact places a high priority on filesize, but you can see how this might get confusing quickly for projects of even marginally higher complexity. #REACT GRAPHVIZ CODE#This is valid code because src/component only wants renderComponent from src/vdom/component, while src/vdom/component-recycler only wants Component from src/component. src/vdom/component-recycler.js which imports.dependency-cruiser highlights actual (invalid) circular dependencies, but some dependencies can be circular while importing completely independent pieces of code. The arrows also suggest potential opportunities for less confusing file structures. That's great! As I get into contributing to Preact I can do a breadth first scan of the top level stuff while keeping track of those files I have visited/should visit! The "terminal dependencies" like constants, util, options, and vnode also stand out as items that are frequently imported which themselves have no dependencies. render, component, render-queue, clone-element, and h are top level imports, and vdom is an important submodule. This is slightly messier, but can still be followed. Pretty handy for a first glance! But what does it look like for a non-trivial project? Visual code spelunking Here you can see that index.js is the highest level file, followed by scheduler.js and reconciler.js, while swyxjs.js seems like one of those "utils" files that is imported by everybody without importing anything else (it is). Here's dependency-cruiser run on the reactive-react project I recently released at React Rally: Then, in the folder of any project you care about, you can run:ĭepcruise -exclude "^node_modules" -output-type dot src | dot -T svg > dependencygraph.svgĪssuming the core of your code lives in the src sub folder and you have Graphviz dot installed (it comes installed in Netlify's buildbot so no fears about that). You can install dependency-cruiser globally with npm i -g dependency-cruiser. #REACT GRAPHVIZ SERIES#If you're diving into a series of caves, wouldn't it be nice to have a map? This is what I call Visual Internal Documentation, and dependency-cruiser is a great way to create and automate this! Getting Started with dependency-cruiser I think visualizing projects is really important when you want to do some code spelunking - diving into large codebases you don't know anything about. Recently Bret Comnes pointed me to Sander Verweij's dependency-cruiser project, which describes itself like this: While time is of course scarce, I am always interested in simple ideas for making open source documentation easier, since it has a domino effect further down on whether people feel welcome to get involved. Run `npm install` to install dependenciesĪny time I see that I usually think of the after credits scene from Finding Nemo: Most CONTRIBUTING.md's read something like this: 1. Whatever deficiencies we perceive in open source documentation (there isn't enough of it, for starters) is magnified 10x when it comes to documenting how it works for folks who want to contribute. Most documentation in open source is user facing. #REACT GRAPHVIZ HOW TO#Opinions & Insights How to easily visualize a project's dependency graph with dependency-cruiser ![]()
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