Capital Components

Components to support the Watson Financial Services Capital Design System.

This library makes the assumption that you already have carbon-components installed and behaves as an addon to that project. Currently we are using carbon v9 with plans to upgrade to v10.

Libraries

🛠 Component Library

• Storybook
• Repo

Setup

yarn add capital-components

Note: There are additional required dependencies like emotion and icons that should also be installed. Check the package.json for all required peer dependencies.

General Styling

This repo provides a small set of SASS files that can be used for styling components.

@import "~capital-components/styles/scss/carbon-components.scss";
@import "~capital-components/styles/scss/styles.scss";
@import "~capital-components/styles/css/cap-grid-legacy.css";

import "capital-components/styles/css/carbon-components.css";
import "capital-components/styles/css/styles.css";
import "capital-components/styles/css/cap-grid-legacy.css";

We use CSS styling for a few elements (grid, font sizing, base carbon styles) for the sake of a shared reference point with other projects.

Emotion Styling

We use the emotion library to provide dynamic styling combined with low configuration support. Using emotion allows anyone using this library to only have the emotion dependency but not worry about webpack config or loader specifics. It also allows our package to be relatively small and prevent including a lot of unused CSS.

Using emotion also allows developers to control scope like no other CSS framework.

Learn more here

Some Classes

| Class | Use | | ----------------- | ------------------ | | cap--type-alpha | header 1 type face | | cap--type-beta | header 2 type face | | cap--type-gamma | header 3 type face | | cap--type-delta | header 4 type face | | cap--type-epsilon | header 5 type face |

See the styles.scss files for other useful styles. Note that we did not make this apply to all h1 (h2, etc) elements intentionally, as it conflicts with carbon's styling.

Theming

Our themes are based on carbon themes, so you can import your custom theme file prior to our styles file. We've provided some example theme files.

@import "~capital-components/styles/scss/themes/regulatory-compliance.scss";
@import "~capital-components/styles/scss/styles.scss";

However, we also use emotion theming to get dynamic theme colors (or other theme properties). To take advantage of many of our components, you need to wrap your app with the Theme Provider:

import { ThemeProvider } from 'capital-components/lib/support/theme';
import theme from 'capital-components/lib/support/themes/other-products';

...

<ThemeProvider theme={theme}>
    <App />
</ThemeProvider>

Spacing

We use a standardized spacing scheme built (details in src/layout/spacing)

The suggestion is to use the buildSpacingFromString method to determine how much padding an element should have. This method works on a string like "top md bottom md" which replaces the mds with the appropriate spacing size and applies that to the associated direction.

Please see the test file for more detailed use cases.

Grid

We provide some utility components that are built upon css-gridish

React Component Usage

import { Grid, Col } from "capital-components";

Vertical Spacing

Grid (and Col) elements control their horizontal spacing because they are grid elements. Sometimes you do want to specify padding on the vertical axis. Like spacing, we provide a prop on Grid/Col elements called verticalPadding which takes a string and translates that to standard padding.

Unlike the spacing function, this prop can only apply padding to top or bottom. Please see the test file for more detailed use cases.

Media queries

This library exposes some useful media query helpers that can be used inside javascript. They are located here:

import { breakpoints } from "capital-components/lib/layout/mediaQueries";

Supported breakpoint sizes can be found here

With React

We also suggest using the package react-media to supplement this functionality.

With react-media, we can build a component that changes it's rendering based on the media queries:

import Media from "react-media";
import { breakpoints } from "capital-components/lib/layout/mediaQueries";

const Comp = () => (
  <Media query={{ maxWidth: breakpoints.s - 1 }}>
    {matches => (matches ? <Comp1 /> : <Comp2 />)}
  </Media>
);

This component would render Comp1 if the screen size is less than the small breakpoint.

Note: We subtract 1 from the breakpoint for consistency. These breakpoints are designed for min-width in mind, so max-width needs some minor adjustments to keep in sync with all the mediaqueries in emotion.

Alternatively, you can use the helper component:

import { Mobile } from "capital-components";

const Comp = () => <Mobile>{isMobile => (isMobile ? <Comp1 /> : <Comp2 />)}</Mobile>;

With Emotion

Emotion css also works really well with our media queries package. You can see some of the examples inside the media query section of storybook

mq

Used instead of css function from emotion. The following will generate a div that has the background color of red on screens smaller than the s breakpoint:

import { mq } from "capital-components/lib/layout/mediaQueries";

const Comp = () => <div className={mq.s("background-color: red;")}>Hello World</div>;

mqStringsMax

Another way to do it is to use some media query helpers within another css call. So something like the following would work. This is useful when combined with non-media query related css. The following will generate a div with display flex and that has the background color of red on screens smaller than the s breakpoint:

import { css } from "emotion";
import { mqStringsMax as mediaQuery } from "capital-components/lib/layout/mediaQueries";

const Comp = () => (
  <div
    className={css`
      display: flex;
      ${mediaQuery.s("background-color: red;")};
    `}
  >
    Hello World
  </div>
);

buildStringForMediaQuery

This helper is useful for building a map of media query sizes to a specific css combination. The following will generate a div that has the background color of blue when screen is larger than s breakpoint and yellow when screen is larger than s and xl:

import { css } from "emotion";
import { buildStringForMediaQueries } from "capital-components/lib/layout/mediaQueries";

const mediaQueryString = buildStringForMediaQueries({
  s: "background-color: blue;",
  xl: "background-color: yellow;"
});

const Comp = () => <div className={css(mediaQueryString)}>Hello World</div>;

Visualization Colors

Currently we include a palette of 20 colors, importable like so:

import { paletteSet20 } from "capital-components/lib/support/vizColors";

It comes out as an array of 20 items, randomized, and based on b-splines: http://jsfiddle.net/frj3tb6a/11/

Importing library

You can import the generated bundle to use the whole library:

import { Grid } from "capital-components";

NPM scripts

• npm t: Run test suite
• npm start: Run npm run build in watch mode
• npm run test:watch: Run test suite in interactive watch mode
• npm run test:prod: Run linting and generate coverage
• npm run build: Generate bundles and typings, create docs
• npm run lint: Lints code
• npm run commit: Commit using conventional commit style (husky will tell you to use it if you haven't :wink:)

Git Hooks

There is already set a precommit hook for formatting your code with Prettier :nail_care:

FAQ

Array.prototype.from, Promise, Map... is undefined?

TypeScript or Babel only provides down-emits on syntactical features (class, let, async/await...), but not on functional features (Array.prototype.find, Set, Promise...), . For that, you need Polyfills, such as core-js or babel-polyfill (which extends core-js).

For a library, core-js plays very nicely, since you can import just the polyfills you need:

import "core-js/fn/array/find"
import "core-js/fn/string/includes"
import "core-js/fn/promise"
...

What if I don't want git-hooks, automatic releases or semantic-release?

Then you may want to:

• Remove commitmsg, postinstall scripts from package.json. That will not use those git hooks to make sure you make a conventional commit

Credits

Built based on this startkit: https://github.com/alexjoverm/typescript-library-starter.git