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0.22.2 • Public • Published

Built With Stencil



The Moxi Design System is a framework utilizing TailwindCSS and StencilJS to provide a CSS foundational framework combined with a library of universal Javascript components to use in any project with any framework you desire.

The goal is to create this framework to the spec of our design team and committing to the continued growth of this system moving forward.


The project uses Vuepress as a means to write documentation as you develop. When the system is built, Vuepress is compiled to the docs directory to be accessed via Github pages.

Installation docs for this project can be found in the root README.md


This project utilises the local mds-styles package. Yarn will automatically link that package to the mds dependancies when you run yarn install. However you must still build the mds-styles package:

yarn workspace @moxiworks/mds-styles build

Running locally

After the dependencies are installed run yarn dev to start the development Vuepress server.

[!IMPORTANT] If you run into issues, try running yarn tailwind:dev and yarn stencil:dev in two separate processes. Once they are both running, open a third terminal and run yarn docs:dev. All three of these scripts will run endlessly as they will be watching for changes to your stylesheets, components, and documentation files.

If you receive an error regarding variables.scss when you run yarn tailwind:dev, you need to build mds-styles. See Dependencies above.

You can now access the site at http://localhost:8080.


Building in this package is quite complex. We define a different build for each tool (stencil, tailwind, vuepress), and each type of stencil output (mds, react, vue, angular ...etc).

yarn build is the simplest solution, as it will build everything. But you can save time if you're only testing a single output (e.g yarn build:react)

The build script calls build.sh. This script utilises an env called "TARGET" to determine the build type. This is done to support the yarn workspaces foreach command, which will build all dependancies. Since build is the command that would run in other packages, we want the build command in this package to support all outputs.

Formatting and linting

The project uses prettier to standardize code style. If you have a prettier plugin installed in your editor, then files may be formatted automatically on save. Otherwise, staged files will be formatted during a pre-commit hook (via husky and lint-staged). See the .prettierrc file for rules.

JavaScript and TypeScript files will also be linted prior to being committed. The commit will fail if there are any warnings or errors per our .eslintrc.js ruleset, which is based on eslint:recommended and @typescript-eslint/recommended.

Vuepress Documentation Only Creation and Editing

This has been updated to where you can simply run yarn dev to update documentation without the worry of unintended dynamic file changes being added to your commits.

Where Things Live


The development site is located under the vuepress directory. To learn more about Vuepress and it's paradigms, please read the documentation here.

The basics are very straight forward. The site is powered by Markdown files. Add and edit folders and .md files as needed for documentation and development.

You can develop the component in Vuepress then write the documentation around it when ready.

StencilJS Components

All of the StencilJS components are located in the src directory.

You can read more about Stencil, it's lifecycle methods, property handling, etc at https://stenciljs.com/docs/introduction.


The TailwindCSS code is located under src/tailwind. The configuration file is located in the root of the directory as tailwind.config.js.

You can read more about TailwindCSS here.


We are not using the Shadow DOM for the Stencil components and are not using the CSS paradigm they provide. The reason is that the CSS for this project needs to also support Ruby based view components. You can read more about them here: https://viewcomponent.org/.

There's no reason to write and maintain this CSS in two places so the TailwindCSS implementation will be the source of truth for our component styling.

Under src/tailwind you'll see directories like mx-input and mx-button. Those SASS directories and files are included in the styles.css file. SCSS is transpiled to CSS immediately thanks to PostCSS.

Writing a Component

Below is a brief checklist for authoring a new component:

  • [ ] Add a new Stencil component.
    • This can be as simple as copying and renaming an existing directory within src/components. Be sure to then update the file names and tags within those files as well.
    • Alternatively, there is a generator to stub a new component: yarn stencil:generate mx-{name of component}. All of the components are prefixed with mx-. For example, the input component is called mx-input which is essentially the tag name <mx-input />.
  • [ ] If necessary, add a new index.scss stylesheet under src/tailwind. For example, a new mx-gooey-menu component would require a src/tailwind/mx-gooey-menu/index.scss file.
    • [ ] Be sure to then import this file in src/tailwind/styles.css (e.g. @import './mx-gooey-menu/index.scss';).
  • [ ] Update or add a documentation file. Inside vuepress/components are markdown files, such as menus.md, which contain the documentation for the components. Add live examples to the page and leverage the vuepress dev server when developing your component.
    • [ ] If a new page is needed, create a new .md file (e.g. vuepress/components/gooey-menus.md). Add the new page to vuepress/.vuepress/config.js under themeConfig.sidebar. Try to keep the list alphabetical.
    • [ ] Add the Properties and Events to your docs page automatically by adding an instance of the vuepress ComponentReadme component (e.g. <ComponentReadme component="mx-gooeymenu" />);
  • [ ] Test-drive your live examples in Chrome, Firefox, and Safari.
    • [ ] Try emulating smaller screens (as narrow as 375px) as well as larger ones.
    • [ ] Try to ensure accessibility for screen readers and keyboard navigation. The free version of axe DevTools provide a good basic check.
  • [ ] Create a unit test file (e.g. src/components/mx-gooey-menu/test/mx-gooey-menu.spec.tsx). Refer to the Stencil testing documentation. Try to cover as many props and events as possible. Certain responsive behaviors may be difficult to reproduce in the test runner.
  • [ ] Run yarn test and ensure all tests pass.
  • [ ] When writing your commit message, use the feat: prefix since you are adding a shiny new feature!

Using In A Project

From your project run yarn add @moxiworks/mds or npm install @moxiworks/mds depending on your package manager.

At your entry point add the following code:

import { applyPolyfills, defineCustomElements } from '@moxiworks/mds/loader';

// Bind the custom elements to the window object
applyPolyfills().then(() => {

StencilJS provides a loader which dynamically "tree-shakes" the code as needed. So, for example, the bundle for the mx-input won't be included in your bundle until you've written code in one of your views like:

<mx-input label="Placeholder & Left Icon" left-icon="ph-apple-logo" />

Framework Integrations

StencilJS has a bunch of documentation around integrating these types of components into most popular frameworks - including vanilla Javascript. You can read more about that here: https://stenciljs.com/docs/overview

We currently have the following framework integrations:




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