Storybook presets are pre-configured settings or configurations that enable developers quickly set up and customize their environment with a specific set of features, functionalities, or integrations.
Preset addons allow developers to compose various configuration options and plugins via APIs to integrate with Storybook and customize its behavior and functionality. Typically, presets are separated into two files, each with its specific role.
This type of preset is user-facing and responsible for registering the addon without any additional configuration from the user by bundling Storybook-related features (e.g., parameters) via the
previewAnnotations and UI related features (e.g., addons) via the
managerEntries API. For example:
When writing a preset, you can access a select set of APIs to interact with the Storybook environment, including the supported builders (e.g., Webpack, Vite), the Storybook configuration, and UI. Below are the available APIs you can use when writing a preset addon.
To customize Storybook's Babel configuration and add support for additional features, you can use the
babelDefault API. It will apply the provided configuration ahead of any other user presets, which can be further customized by the end user via the
babel configuration option. For example:
By default, Storybook provides support for the leading industry builders, including Webpack and Vite. If you need additional features for any of these builders, you can use APIs to extend the builder configuration based on your specific needs.
If you are creating a preset and want to include Vite support, the
viteFinal API can be used to modify the default configuration and enable additional features. For example:
To customize the Webpack configuration in Storybook to add support for additional file types, apply specific loaders, configure plugins, or make any other necessary modifications, you can use the
webpackFinal API. Once invoked, it will extend the default Webpack configuration with the provided configuration. An example of this would be:
If you're writing a preset that loads third-party addons, which you may not have control over, but require access to specific features or additional configuration, you can use the
managerEntries API. For example:
If you need additional settings to render stories for a preset, like decorators or parameters, you can use the
previewAnnotations API. For example, to apply a decorator to all stories, create a preview file that includes the decorator and make it available to the preset as follows:
The presets API is designed to be flexible and allow you to customize Storybook to your specific needs, including using presets for more advanced use cases without publishing them. In such cases, you can rely on a private preset. These private presets contain configuration options meant for development purposes and not for end-users. The
.storybook/main.js|ts file is an example of such a private preset that empowers you to modify the behavior and functionality of Storybook.
For addon consumers, the
managerEntries API can be too technical, making it difficult to use. To make it easier to add addons to Storybook, the preset API provides the
addons API, which accepts an array of addon names and will automatically load them for you. For example:
The array of values supports references to additional presets and addons that should be included in the manager. Storybook will automatically detect whether the provided value is a preset or an addon and load it accordingly.
Entries are the place to register entry points for the preview. This feature can be utilized to create a configure-storybook preset that automatically loads all
*.stories.js files into Storybook, eliminating the need for users to copy-paste the same configuration repeatedly.
The Storybook preset API also provides access to the UI configuration, including the
body HTML elements of the preview, configured by the
previewBody APIs. Both allow you to set up Storybook in a way that is similar to using the
preview-body.html files. These methods accept a string and return a modified version, injecting the provided content into the HTML element.
Additionally, if you need to customize the manager (i.e., where Storybook’s search, navigation, toolbars, and addons render), you can use the
managerHead to modify the UI, similar to how you would do it with the
manager-head.html file. For example:
However, if you need, you can also customize the template used by Storybook to render the UI. To do so, you can use the
previewMainTemplate API and provide a reference for a custom template created as a
ejs file. For an example of how to do this, see the template used by the Webpack 5 builder.
As Storybook relies on esbuild instead of Webpack to build the UI, presets that depend on the