@wcd/gqio.style-dictionary

v2.10.0

Published

3 years ago

Style once, use everywhere. A build system for creating cross-platform styles.

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Style Dictionary

Style once, use everywhere.

A Style Dictionary uses design tokens to define styles once and use those styles on any platform or language. It provides a single place to create and edit your styles, and exports these properties to all the places you need - iOS, Android, CSS, JS, HTML, sketch files, style documentation, etc. It is available as a CLI through npm, but can also be used like any normal node module if you want to extend its functionality.

When you are managing user experiences, it can be quite challenging to keep styles consistent and synchronized across multiple development platforms and devices. At the same time, designers, developers, PMs and others must be able to have consistent and up-to-date style documentation to enable effective work and communication. Even then, mistakes inevitably happen and the design may not be implemented accurately. StyleDictionary solves this by automatically generating style definitions across all platforms from a single source - removing roadblocks, errors, and inefficiencies across your workflow.

For detailed usage head to https://amzn.github.io/style-dictionary

Watch the Demo on Youtube

Installation

Note that you must have node (and npm) installed.

If you want to use the CLI, you can install it globally via npm:

$ npm install -g style-dictionary

Or you can install it like a normal npm dependency. This is a build tool and you are most likely going to want to save it as a dev dependency:

$ npm install -D style-dictionary

If you want to install it with yarn:

$ yarn add style-dictionary --dev

Usage

CLI

$ style-dictionary build

Call this in the root directory of your project. The only thing needed is a config.json file. There are also arguments:

| Flag | Short Flag | Description | | --- | --- | --- | | --config [path] | -c | Set the config file to use. Must be a .json file | | --platform [platform] | -p | Only build a specific platform defined in the config file. | | --help | -h | Display help content | | --version | -v | Display the version |

Node

You can also use the style dictionary build system in node if you want to extend the functionality or use it in another build system like Grunt or Gulp.

const StyleDictionary = require('style-dictionary').extend('config.json');

StyleDictionary.buildAllPlatforms();

The .extend() method is an overloaded method that can also take an object with the configuration in the same format as a config.json file.

const StyleDictionary = require('style-dictionary').extend({
  source: ['properties/**/*.json'],
  platforms: {
    scss: {
      transformGroup: 'scss',
      buildPath: 'build/',
      files: [{
        destination: 'variables.scss',
        format: 'scss/variables'
      }]
    }
    // ...
  }
});

StyleDictionary.buildAllPlatforms();

Example

Take a look at some of our examples

A style dictionary is a collection of style properties, key/value pairs that describe stylistic attributes like colors, sizes, icons, motion, etc. A style dictionary defines these style properties in JSON files, and can also include static assets like images and fonts. Here is a basic example of what the package structure can look like:

├── config.json
├── properties/
│   ├── size/
│       ├── font.json
│   ├── color/
│       ├── font.json
│   ...
├── assets/
│   ├── fonts/
│   ├── images/

config.json

This tells the style dictionary build system how and what to build. The default file path is config.json in the root of the project, but you can name it whatever you want, you can pass in the --config flag.

{
  "source": ["properties/**/*.json"],
  "platforms": {
    "scss": {
      "transformGroup": "scss",
      "buildPath": "build/",
      "files": [{
        "destination": "scss/_variables.scss",
        "format": "scss/variables"
      }]
    },
    "android": {
      "transformGroup": "android",
      "buildPath": "build/android/",
      "files": [{
        "destination": "font_dimens.xml",
        "format": "android/fontDimens"
      }]
    }
  }
}

Properties

{
  "size": {
    "font": {
      "small" : { "value": "10px" },
      "medium": { "value": "16px" },
      "large" : { "value": "24px" },
      "base"  : { "value": "{size.font.medium.value}" }
    }
  }
}

Here we are creating some basic font size properties. The style definition size.font.small.value is "10px" for example. The style definition size.font.base.value is automatically aliased to the value found in size.font.medium.value and both of those resolve to "16px".

Now what the style dictionary build system will do with this information is convert it to different formats, enabling these values to be used in any type of codebase. From this one file you can generate any number of files like:

$size-font-small: 10px;
$size-font-medium: 16px;
$size-font-large: 24px;
$size-font-base: 16px;

<dimen name="font-small">10sp</dimen>
<dimen name="font-medium">16sp</dimen>
<dimen name="font-large">24sp</dimen>
<dimen name="font-base">16sp</dimen>

float const SizeFontSmall = 10.00f;
float const SizeFontMedium = 16.00f;
float const SizeFontLarge = 24.00f;
float const SizeFontBase = 16.00f;

Quick Start

The style dictionary framework comes with some example code to get you stared. Install the node module globally, create a directory and cd into it.

$ npm i -g style-dictionary
$ mkdir MyStyleDictionary
$ cd MyStyleDictionary

Now run:

$ style-dictionary init basic

This command will copy over the example files found in example in this repo. Now you have an example project set up. You can make changes to the style dictionary and rebuild the project by running:

$ style-dictionary build

Take a look at the documentation for the example code.

Style Properties

A style property is an attribute to describe something visually. It is atomic (it cannot be broken down further). Style properties have a name, a value, and optional attributes or metadata. The name of a property can be anything, but we have a proposed naming structure that works really well in the next section.

Category/Type/Item Structure

While not exactly necessary, we feel this classification structure of style properties makes the most sense semantically. Style properties can be organized into a hierarchical tree structure with the top level, category, defining the primitive nature of the property. For example, we have the color category and every property underneath is always a color. As you proceed down the tree to type, item, sub-item, and state, you get more specific about what that color is. Is it a background color, a text color, or a border color? What kind of text color is it? You get the point. Now you can structure your property json files like simple objects:

{
  "size": {
    "font": {
      "base":  { "value": "16" },
      "large": { "value": "20" }
    }
  }
}

The CTI is implicit in the structure, the category and type is 'size' and 'font', and there are 2 properties 'base' and 'large'.

Structuring style properties in this manner gives us consistent naming and accessing of these properties. You don't need to remember if it is button_color_error or error_button_color, it is color_background_button_error!

You can organize and name your style properties however you want, there are no restrictions. But we have a good amount of helpers if you do use this structure, like the 'attribute/cti' transform which adds attributes to the property of its CTI based on the path in the object. There are a lot of name transforms as well for when you want a flat structure like for Sass variables.

Also, the CTI structure provides a good mechanism to target transforms for specific kinds of properties. All of the transforms provided by the framework use the CTI of a property to know if it should be applied. For instance, the 'color/hex' transform only applies to properties of the category 'color'.

You can also add a comment to a style property:

{
  "size": {
    "font": {
      "base":  {
        "value": "16",
        "comment": "the base size of the font"
      },
      "large": {
        "value": "20",
        "comment": "the large size of the font"
      }
    }
  }
}

The comment will appear in the output files, where relevant or the output format supports comments.

Extending

The style dictionary build system is made to be extended. We don't know exactly how everyone will want to use style dictionaries in their project, which is why you can create custom transforms and formats.

const StyleDictionary = require('style-dictionary').extend('config.json');

StyleDictionary.registerTransform({
  name: 'time/seconds',
  type: 'value',
  matcher: function(prop) {
    return prop.attributes.category === 'time';
  },
  transformer: function(prop) {
    return (parseInt(prop.original.value) / 1000).toString() + 's';
  }
});

StyleDictionary.buildAllPlatforms();

For more information on creating your own transforms and formats, take a look at our docs.

Mascot

The mascot for Style Dictionary is "Pascal" the chameleon (seen below). You can also find them blending in as the logo throughout the documentation.

Contributing

Please help make this framework better. For more information take a look at CONTRIBUTING.md

License

Apache 2.0