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https://github.com/mrmartineau/design-system-utils
👩🎨 Access your design tokens with ease
https://github.com/mrmartineau/design-system-utils
css-in-js design-tokens emotion preact react styled-components tokens typescript
Last synced: 26 days ago
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👩🎨 Access your design tokens with ease
- Host: GitHub
- URL: https://github.com/mrmartineau/design-system-utils
- Owner: mrmartineau
- License: mit
- Created: 2017-09-03T10:39:18.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2020-03-06T05:37:05.000Z (over 4 years ago)
- Last Synced: 2024-04-25T17:05:27.795Z (7 months ago)
- Topics: css-in-js, design-tokens, emotion, preact, react, styled-components, tokens, typescript
- Language: TypeScript
- Homepage: https://zander.wtf
- Size: 1.36 MB
- Stars: 535
- Watchers: 9
- Forks: 13
- Open Issues: 12
-
Metadata Files:
- Readme: readme.md
- License: LICENSE
Awesome Lists containing this project
- Awesome-Design-Tokens - design-system-utils
- awesome-emotion - design-system-utils - Utilities to give better access to your design system. (Libraries)
- jimsghstars - mrmartineau/design-system-utils - 👩🎨 Access your design tokens with ease (TypeScript)
README
👩🎨
Design System Utils
[](https://www.npmjs.com/package/design-system-utils)
[](https://www.npmjs.com/package/design-system-utils) [](https://travis-ci.org/mrmartineau/design-system-utils)
[](http://makeapullrequest.com)
Design System Utils is a micro framework that standardises your design-system tokens & provides helpful utility functions to access the information. It can be used with [styled-components](https://styled-components.com), [emotion](https://emotion.sh), [glamorous](https://glamorous.rocks/) or any other [CSS-in-JS framework](https://css-in-js-playground.com/).
## Install
```sh
yarn add design-system-utils
# or
npm install --save design-system-utils
```
### Size
```
$ size-limit
build/cjs.js
Package size: 814 B
Size limit: 1 KB
es/index.js
Package size: 806 B
Size limit: 1 KB
With all dependencies, minified and gzipped
```
🤓 Table of contents
- [Usage](#usage)
- [Setup](#setup)
- [Initialise the design system framework](#initialise-the-design-system-framework)
- [Accessing the design system data in your app](#accessing-the-design-system-data-in-your%C2%A0app)
- [Options](#options)
- [Basic API methods](#basic-api-methods)
- [`tokens.get()` - Get a token value](#tokensget---get-a-token-value)
- [`tokens.set()` - Set a token value](#tokensset---set-a-token-value)
- [API helper methods](#api-helper-methods)
- [`tokens.fontSize()` or `tokens.fs()` - Get font-size values](#tokensfontsize-or-tokensfs---get-font-size-values)
- [Modular scale](#modular-scale)
- [Color palette](#color-palette)
- [`tokens.color()` - Get color palette values](#tokenscolor---get-color-palette-values)
- [`tokens.brand()` - Get brand palette values](#tokensbrand---get-brand-palette-values)
- [`tokens.bp()` - Get responsive breakpoint values](#tokensbp---get-responsive-breakpoint-values)
- [`tokens.z()` - Get `z-index` values](#tokensz---get-z-index-values)
- [`tokens.spacing()` or `tokens.space()` - Get spacing values](#tokensspacing-or-tokensspace---get-spacing-values)
- [Array example:](#array-example)
- [Object example:](#object-example)
- [Calculations](#calculations)
- [`tokens.multiply()`](#tokensmultiply)
- [`pxTo()`](#pxto)
- [`toPx()`](#topx)
- [`parseUnit()`](#parseunit)
- [Usage with Typescript](#usage-with-typescript)
- [Aliases](#aliases)
- [Demo & examples](#demo--examples)
- [Licence](#licence)
## Usage
First create your design system file, this contains all your design tokens that your app or site will use; things like font-sizes, color palette, spacing etc (kind of like a Sass/Less variables file).
For example you can create a top-level directory named `tokens`, `theme` or `designsystem`, and add an index.js inside, like so:
```
./tokens
└── index.js
```
A simple version of a tokens file with Design System Utils:
```js
// ./tokens/index.js
import DesignSystem from 'design-system-utils'
// your design tokens object goes here, see below for further details
const designTokens = {...}
export default new DesignSystem(designTokens)
```
### Setup
The "shape" and structure of your design tokens object **_can_** actually be anything you want, however, if you want to make use of the shortcut/helper methods like `tokens.fontSize|bp|z|color|brand|spacing` etc, there is a particular shape that your data will need to follow, see below:
(🤔 the below code snippet includes some psuedo types for the values that occur in the different parts of the tokens object)
```js
{
type: {
// this should be set as a px value if you have `options.fontSizeUnit` set
// to 'rem' or 'em' so that the lib can convert the values properly
baseFontSize: '' // string,
// used with `tokens.fs('size')` or `tokens.fontSize('size')`
sizes: {
key: '' // ,
},
},
// Color palette
// Each object needs to have the same shape
// Each color object needs a `base` value to be the default
// Have as many color objects as you like
colors: {
// Used with `ds.color('colorName')`
colorPalette: {
colorName: {
base: '' // , // base is the default
},
},
// Used with `ds.brand('colorName)`
brand: {
colorName: '' // , base is the default
}
},
// Breakpoints
// Used with `ds.bp()`
// Keys can be anything you like
// Have as many breakpoints as you like
// Values can be use any unit you like
breakpoints: {
key: '' // ,
},
// Z-index
// Used with `ds.z()`
zIndex: {
key: 10 //
},
// Spacing
// Used with `ds.spacing()` or `ds.space()`
spacing: {
scale: [] // [, ...],
},
}
```
Below is an excerpt from the example design-system. See a more complete version in the [`/example`](example/myDesignSystem.js) directory or some that are used in the design-system-utils tests: [1](https://github.com/mrmartineau/design-system-utils/blob/master/src/testData/ds1.js) & [2](https://github.com/mrmartineau/design-system-utils/blob/master/src/testData/ds1.js).
```js
const designTokens = {
type: {
baseFontSize: '20px',
sizes: {
xs: '16px',
s: '20px',
base: '30px',
m: '36px',
l: '42px',
xl: '50px',
xxl: '58px',
},
fontFamily: {
system:
'-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans"',
sans: '"Helvetica Neue", Helvetica, Arial, sans-serif',
serif: 'Georgia, "Times New Roman", Times, serif',
mono: 'Menlo, Monaco, "Courier New", monospace',
},
lineHeight: {
headings: 1.1,
},
fontWeight: {
normal: 300, // Useful to set here if using anything other than `normal`
bold: 'bold', // Useful to set here when bold webfonts come as 400 font-weight.
headings: 'bold', // instead of browser default, bold
},
},
}
```
### Initialise the design system framework
```js
// myDesignSystem.js
import DesignSystem from 'design-system'
const designTokens = {...}
export default new DesignSystem(designTokens)
```
## Accessing the design system data in your app
To access your design system, you just need to `import` it to the current file, like so:
```js
import tokens from './tokens' // assuming you exported `default` from your design system file
```
Here is a very simple component using [styled-components](https://styled-components.com) and some values from the tokens, you should be able to see how easy it is to pull information from the design system.
```js
// Example using styled-components
import styled from 'styled-component'
import tokens from './tokens'
export const Box = styled.div`
font-family: ${tokens.get('type.fontFamilyBase')};
background-color: ${tokens.brand('primary')};
margin: ${tokens.space(2)} 0;
`
```
## Options
There is only one option that can be passed to your design system class, it relates to font-sizing:
```js
// Use default options. do not convert the font-sizes to rems or ems
export default new DesignSystem(myDesignSystem)
// OR: with custom options
export default new DesignSystem(myDesignSystem, {
// this is used to convert your `type.sizes` values from one unit to another
// e.g. to convert all `px` sizes to `rem`, set this option:
fontSizeUnit: 'rem',
// this means you can define values using px and use rems in your app
})
```
## Basic API methods
### `tokens.get()` - Get a token value
The `tokens.get()` function can be used to get any value from the design-system. Use object dot notation to find the value you need from your design system object.
```js
// with the system setup, as above
tokens.get('lineHeight.headings') // 1.1
tokens.get('a.really.deeply.nested.value')
```
### `tokens.set()` - Set a token value
The `tokens.set()` function can be used to set tokens values. This means you can overwrite existing items, or create new items that are specific to your application.
Like the `.get()` method, use object dot notation to find the value you need from your design system object.
This method uses [dset](https://github.com/lukeed/dset#usage) under the hood, so please read the docs there for more info.
```js
// with the system setup, as above
tokens.set('forms.inputBackground', '#fff')
// then use it later like so:
tokens.get('forms.inputBackground')
```
## API helper methods
The helper methods make getting values _much_ more simple.
- [`tokens.fontSize()` or `tokens.fs()`](#tokensfontsize-or-tokensfs---get-font-size-values) - Get font-size values
- [`tokens.color()`](#tokenscolor---get-color-palette-values) - Get color palette values
- [`tokens.brand()`](#tokensbrand---get-brand-palette-values) - Get brand palette values
- [`tokens.bp()`](#tokensbp---get-responsive-breakpoint-values) - Get responsive breakpoint values
- [`tokens.z()`](#tokensz---get-z-index-values) - Get `z-index` values
- [`tokens.spacing()` or `tokens.space()`](#tokensspacing-or-tokensspace---get-spacing-values) - Get spacing values
### `tokens.fontSize()` or `tokens.fs()` - Get font-size values
The `tokens.fontSize()` method is a short-hand for the `tokens.get()` method. It can be used to get a value from the `type.sizes` object.
The `type.sizes` object’s values can be formatted in a few ways:
- as a string with any unit of measurement, e.g. `s: '13px'` / `px`, `rem` or `em`
- as a template string using another function to calculate font-sizes, for example a modular-scale, e.g. `${ms(0, modularscale)}px`. **Note: this uses an external package, [modularscale-js](https://github.com/modularscale/modularscale-js)**
```js
// define some values// type.sizes object
sizes: {
xs: '16px',
s: '20px',
base: '30px',
m: '36px',
l: '42px',
xl: '50px',
xxl: '58px',
},
// retrieve some values
tokens.fontSize('xl')
tokens.fs('xl') // `tokens.fs()` is a short-hand alias for `tokens.fontSize()`
tokens.fs('xl', true) // return font-size in px regardless of `option.fontSizeUnit` value
```
#### Modular scale
**Note: v0.x.x had modular scale functionality built-in, in v1.x.x, this has been removed to reduce file-size for those that don't need a modular scale.**
To make use of a modular scale, there are a few things that need to be done:
- install a modular scale converter package, like [modularscale-js](https://github.com/modularscale/modularscale-js)
- define your modular scale options outside of your design-system object
- add the modular scale values to the `type.sizes` object
```js
const modularscale = {
base: [30],
ratio: 1.5,
}
// design system
...
sizes: {
xs: `${ms(-2, modularscale)}px`,
s: `${ms(-1, modularscale)}px`,
}
...
```
Testing and remembering the values from your modular scale can be tricky, there are two options that can be used, either:
- visit [modularscale.com](https://modularscale.com) and enter your settings, you can then view all the type sizes on the scale you specified
- or, add the below snippet to your code to print out the values of your scale:
```js
const sizes = tokens.get('type.sizes')
Object.keys(sizes).forEach(item => {
console.log(item, ':', sizes[item]) // e.g. `base : 20px`
})
```
### Color palette
There are two possible ways to access color information: the color palette and the brand colors.
The color palette is intended to contain all the colors (and their shades) that your app will use, and the brand palette _should_ contain the specific colors that your brand uses.
Two methods can be used to retrieve the values, these are: `tokens.color()` and `tokens.brand()`, below is what the data looks like for them:
```js
colors: {
// With a color palette like this:
colorPalette: {
bright: {
base: '#F9FAFB',
dark: '#F4F6F8',
darker: '#DFE4E8',
},
dark: {
base: '#212B35',
light: '#454F5B',
lighter: '#637381',
},
},
// With a brand palette like this:
brand: {
red: '#e82219',
deeporange: '#ff7200',
orange: '#ff9500',
green: '#c4d000',
teal: '#1aa5c8',
navy: '#0052da',
}
},
```
#### `tokens.color()` - Get color palette values
The `tokens.color()` function gets values from the `colorPalette` object. It assumes every color has a `base` property and other properties for different shades of the same color.
This is a short-hand for the `tokens.get()` function.
```js
// Get values like this:
tokens.color('bright') // #F9FAFB - the `base` key is the default, so it is not needed
tokens.color('bright', 'dark')
tokens.color('background.extra.dark') // Accepts a path (in this case the second `variant` argument is ignored)
```
#### `tokens.brand()` - Get brand palette values
The `tokens.brand()` function gets values from the `colors.brand` object.
This is a short-hand for the `tokens.get()` function.
```js
// Get brand values like this:
tokens.brand('orange')
tokens.brand('pink')
tokens.brand('primary.blue') // it is possible to nest this object as much as you like
```
### `tokens.bp()` - Get responsive breakpoint values
The `tokens.bp()` method is a short-hand for the `tokens.get()` method. It can be used to get a breakpoint from the `breakpoints` object.
```js
tokens.bp('m')
```
### `tokens.z()` - Get `z-index` values
The `tokens.z()` method is a short-hand for the `tokens.get()` method. It can be used to get a breakpoint from the `zIndex` object.
```js
tokens.z('low')
```
### `tokens.spacing()` or `tokens.space()` - Get spacing values
The `tokens.spacing()` method returns a value from your `spacing.scale` definition. **The spacing data could either be an array, or an object.**
- If an array, it takes an `index` (number) for that array e.g. `tokens.space(2)`. This variant adds `px` to the end of the string, this will be deprecated in v2.0.0.
- If an object, it takes a `key` (string) for the item in that object e.g. `tokens.space('m')`
#### Array example:
```js
scale: [0, 8, 16, 24, 32, 40]
tokens.spacing(2) // '16px'
// Note: `tokens.space(2)` can also be used
```
#### Object example:
```js
scale: {
s: '10rem',
m: '100rem',
l: '1000rem',
}
tokens.spacing('m') // '100rem'
// Note: `tokens.space('m')` can also be used
```
### Calculations
The framework currently provides a few calculation functions, `multiply`, `toPx` and `pxTo`:
#### `tokens.multiply()`
```js
tokens.multiply(10, 2) // 20
// you can pass in another value from the system
tokens.multiply(tokens.get('spacing.baseline'), 2)
// or just use the key from the system
// the initial value will always be run through `parseFloat()`
tokens.multiply('spacing.baseline', 2)
```
#### `pxTo()`
Converts `px` to `rem` or `em`
```js
import { pxTo } from 'design-system-utils'
// pxTo(fontSize, baseFontSize, unit - 'rem'/'em')
pxTo(12, 20, 'rem') // 0.6rem
pxTo(12, 20, 'em') // 0.6em
```
#### `toPx()`
Converts `rem` or `em` value to `px`
```js
import { toPx } from 'design-system-utils'
// toPx(fontSize, baseFontSize)
toPx('1.875rem', 16) // 30px
toPx('1.875em', 16) // 30px
```
#### `parseUnit()`
Parses a number and unit string, and returns the unit used
```js
import { parseUnit } from 'design-system-utils'
parseUnit('1.875rem') // 'rem'
parseUnit('18px') // 'px'
```
## Usage with Typescript
Typescript types and interfaces should be imported as named imports.
See all the type definitions in the [types.ts](https://github.com/mrmartineau/design-system-utils/blob/master/src/types.ts) file. Here are all the exported types that can be extended:
```
{
System,
SystemOptions,
SystemBreakpoints,
SystemZIndex,
SystemFontSizes,
SystemSpacing,
SystemScale,
SystemColorPalette,
SystemBrandPalette,
SystemType,
SystemOptionalKey,
}
```
Below is an example where a new item (`baseline`) is added to the `spacing` object.
```ts
import DesignSystem, { System, SystemOptions, SystemSpacing } from '../index'
interface MySystemSpacing extends SystemSpacing {
baseline: number
}
interface MySystem extends System {
spacing: MySystemSpacing
}
const Tokens: MySystem = {
...
...
spacing: {
scale: [0, 8, 16, 24, 32, 40],
baseline: 20,
},
}
export default new DesignSystem(Tokens)
```
## Aliases
If you'd prefer to rename the above methods, or even add your own getter methods, to access your design tokens, it is very simple. See below for an example:
```js
export tokens from './tokens' // import your design tokens
// create new alias functions
// this renames .bp()
export const breakpoints = bp => tokens.bp(bp)
// this adds a new alias that doesn't already exist in Design System Utils
export const fontWeights = weight => tokens.get('type.fontWeights')
// the aliases can also be for specific values
export const baseFontSize = ds1.get('type.baseFontSize')
export const brandPrimary = ds1.brand('red')
```
Then use them like so:
```js
import { breakpoints, fontWeights, baseFontSize, brandPrimary } from './tokens'
breakpoints('m')
fontWeights('normal')
```
Take a look at [`alias.ts`](https://github.com/mrmartineau/design-system-utils/blob/master/src/alias.ts) and [`alias.test.ts`](https://github.com/mrmartineau/design-system-utils/blob/master/src/alias.test.ts) to see working examples and their usage.
## Demo & examples
I created a demo on [codesandbox.io](https://codesandbox.io/s/6wrp94x7kk), it includes examples of using the design-system utils with [emotion](https://emotion.sh/), [styled-components](https://www.styled-components.com/) and [glamorous](https://glamorous.rocks). There is also a basic example [here](example/).
## Licence
MIT © [Zander Martineau](https://zander.wtf)