gatsby-design-tokens

gatsby-design-tokens

Introduction

Design tokens are the visual design atoms of the design system — specifically, they are named entities that store visual design attributes. We use them in place of hard-coded values (such as hex values for color or pixel values for spacing) in order to maintain a scalable and consistent visual system for UI development.

This quote from the Lightning Design System Design Tokens documentation accurately describes the tokens contained in this package — to be a bit more specific: gatsby-design-tokens offers plain objects or arrays of values for related CSS properties. Currently.

Gatsby's design tokens are following the System UI Theme Specification as well as the Theme UI Theme Specification.

Project state and versioning

gatsby-design-tokens is a work-in-progress, but versions do follow the Semantic Versioning specification:

• Minor fixes to tokens will be released as patch versions.
• Major design changes will be released as minor versions
• Breaking public API changes will be released in a major versions only.

To prevent your site from breaking due to a breaking change or looking dramatically different due to a minor version bump, we recommend the ~ comparator when using this package.

Installation

Using npm:

npm install gatsby-design-tokens --save

Using Yarn:

yarn add gatsby-design-tokens

Tokens 🍒🍋🍏

All exports provide either plain objects or arrays of values for related CSS properties:

import {
  borders,
  // [ 0, `1px solid`, `2px solid` ]
  breakpoints,
  // { xs:`400px`, sm:`550px`, …}
  breakpointsArray,
  // [ "400px", "550px", …]
  colors,
  // { primary:`#639`, blackFade: { 5: `rgba(…)`, 10: …}, …}
  fonts,
  // { body: `-apple-system, …, sans-serif`, monospace: {…} }
  fontsLists,
  // { body: [`-apple-system`, …, `sans-serif`], monospace: […] }
  fontSizes,
  // [ `0.75rem`, …, `5.75rem` ]
  fontSizesPx,
  // [ `12px`, …, `92px` ]
  fontSizesRaw,
  // [ 12, 14, 16, 18, 20, 24, 28, 32, …, 84, 92 ]
  fontWeights,
  // { body: 400, semiBold: 600, …, heading: 700 }
  letterSpacings,
  // { normal: "normal", tracked: "0.075em", tight: "-0.015em" }
  lineHeights,
  // { solid: 1, dense: 1.25, … }
  mediaQueries,
  // { xs: "@media (min-width: 400px)", …, xxl: "@media (min-width: 1600px)" }
  radii,
  // [ 0, "2px", "4px", "8px", "16px", "9999px", "100%" ]
  shadows,
  // { raised: `0px 1px 2px rgba(46,…)`, floating: `0px 2px 4px…` }
  space,
  // [ "0rem", "0.25rem", "0.5rem", …, "4.5rem"]
  spacePx,
  // [ "0px", "4px", "8px", …, "72px"]
  spaceRaw,
  // [ 0, 4, 8, 12, 16, 20, 24, 32, 40, 48, 56, 64, 72]
  transition,
  // transition = {
  //   default: `250ms cubic-bezier(0.4, 0, 0.2, 1)`,
  //   curve: { default: `cubic-bezier(0.4, 0, 0.2, 1)`, … },
  //   speed: { faster: `50ms`, … },
  // }
} from "gatsby-design-tokens"

• rem values are based on a font-size of 16px for the root element.
• All tokens work in the context of Theme UI's Theme Scales, with the exception of breakpoints: Use breakpointsArray for theme-ui and its responsive styles feature.

Find a work-in-progress list of design tokens in the design tokens documentation at gatsbyjs.org/guidelines/design-tokens.

theme-ui themes 🎨

theme

A basic theme-ui theme composed of unmodified tokens, with one exception: colors are modified to provide the basic set of variables described in https://theme-ui.com/theme-spec#color.

TBD: Adopt the theme-ui definitions for the basic colors tokens.

import { theme } from "gatsby-design-tokens/dist/theme"

// when used with `gatsby-plugin-theme-ui`, export the theme
// as default from `src/gatsby-plugin-theme-ui/index.js`
export { theme as default } from "gatsby-design-tokens/dist/theme"

// in case you need theme tokens outside of the `emotion` context
import {
  breakpoints,
  colors,
  fonts,
  fontSizes,
  fontWeights,
  letterSpacings,
  lineHeights,
  mediaQueries,
  radii,
  shadows
  space,
  transition,
} from "gatsby-design-tokens/dist/theme

theme-gatsbyjs-org

The theme currently in use on gatsbyjs.org via gatsby-plugin-theme-ui:

• Extends the base theme's colors with a couple .org-specific things, and provides a dark mode (ref. https://theme-ui.com/color-modes).
• Adds .org-specific sizes and zIndices.
• Adds a couple of variants.
• Uses hex2rgba to create rgba colors.

import { theme } from "gatsby-design-tokens/dist/theme-gatsbyjs-org"

// when used with `gatsby-plugin-theme-ui`, export the theme
// as default from `src/gatsby-plugin-theme-ui/index.js`
export { theme as default } from "gatsby-design-tokens/dist/theme-gatsbyjs-org"

// in case you need theme tokens outside of the `emotion` context
import {
  breakpoints,
  colors,
  fonts,
  fontSizes,
  fontWeights,
  letterSpacings,
  lineHeights,
  mediaQueries,
  radii,
  shadows,
  sizes,
  space,
  transition,
  zIndices,
} from "gatsby-design-tokens/dist/theme-gatsbyjs-org"

Local development

The Gatsby monorepo, which hosts this package, also contains the source for gatsbyjs.org, aka www — where theme-gatsbyjs-org is in use. Using a little helper called gatsby-dev we can develop and test both of them locally.

1. Clone the gatsby monorepo and set it up for local dev

Follow the official guide to clone/fork and set up the Gatsby monorepo. This will roughly look like this:

# clone the repo/your fork
git clone https://github.com/gatsbyjs/gatsby.git
cd gatsby

# set up the repo,install dependencies for `packages`, and build the latter
yarn run bootstrap

# make sure tests are passing
yarn test

# create a new feature branch
git checkout -b topics/new-feature-name

Install gatsby-dev-cli to ease testing your local changes to packages

Assuming gatsby-cli is installed, let's install gatsby-dev-cli with

yarn global add gatsby-dev-cli

gatsby-dev-cli needs to know where your local Gatsby repository lives; navigate to its root folder, get the absolute path to it via pwd, and tell gatsby-dev-cli about it with

gatsby-dev --set-path-to-repo /path-to-local-gatsby/gatsby

2. Get www running on localhost

cd /path-to-local-gatsby/gatsby/www

yarn # to install dependencies

Follow the README instructions to add a .env.development file in www, and add GATSBY_SCREENSHOT_PLACEHOLDER=true to

[…] skip downloading screenshots and generating responsive images for all screenshots and replace them with a placeholder image

Run yarn develop, which thanks to the previous step shouldn't take ~40 minutes but way less. Hopefully you should be able to browse a local version of gatsbyjs.org after this. Let's leave yarn develop running!

3. Rebuild gatsby-design-tokens when it changes, and use gatsby-dev to copy the changed-and-compiled package over to www/node_modules

• Open a new terminal window, go to the root of your local gatsby repo, and run yarn run watch to watch for changes in packages, and recompile the modified package.
  • To watch only certain packages, use yarn run watch --scope=gatsby-design-tokens or --scope={gatsby,gatsby-cli}.
• Last, in another new terminal window, go to gatsby/www, and run gatsby-dev --packages=gatsby-design-tokens to copy the latest local version of the gatsby-design-tokens package over to www/node_modules.
  • Alternatively pass an array to watch multiple packages, or use plain gatsby-dev to copy the latest versions of all local packages that are used in your project's package.json.

4. Finally!

Let's try if everything is running and watching and recompiling! Let's open packages/gatsby-design-tokens/src/fonts.js, and replace

const header = [Futura PT, ...system]

with

const header = system

and you should see Futura PT turning into system-ui within a few moments on your http://localhost:8000.