(No Issue)

What I did

In this PR, the InitialViewportKeyUnion type was added to the viewport addon.

I use the INITIAL_VIEWPORTS of the viewport addon, and I need a union type made up of the keys of the object.

For example, by specifying the type of defaultViewport with the above type, we were able to improve convenience and stability in the viewport declaration of the story.

Currently, when trying to extract the INITIAL_VIEWPORTS type, the INITIAL_VIEWPORTS type is Record<string, Viewport>, so the type is inferred as a string as shown below, so we want to export a union type composed of accurate keys in the addon stage.

With this operation, the type of InitialViewportKeyUnion exported from the viewport addon is inferred as follows.

My application example

An example of using the type in my project is below.

declare module '@storybook/react' {
  export interface Parameters {
    viewport?: {
      defaultViewport?: InitialViewportKeyUnion | typeof DEFAULT_VIEWPORT;
    };
  }
}

Then, when assigning defaultViewport, auto-completion and type checking are possible as shown below.

Of course, this type may just be what I need.

Also, I think there may be inconveniences when adding devices to INITIAL_VIEWPORTS in the future.

Nevertheless, I am requesting a merge because I think adding this type will provide convenience to many developers, including me.

Additionally, if there is any way I can further improve my work, please let me know.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

In the viewport addon, need to check whether the InitialViewportKeyUnion type is properly exported as a union type based on the INITIAL_VIEWPORTS key.

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

Greptile Summary

This pull request adds a new type InitialViewportKeyUnion to the viewport addon in Storybook, enhancing TypeScript support for viewport keys.

• Added InitialViewportKeyUnion type in code/addons/viewport/src/defaults.ts, derived from INITIAL_VIEWPORTS_DATA keys
• Exported InitialViewportKeyUnion for use in other parts of the codebase
• Improved type safety and autocomplete functionality for viewport keys
• No functional changes to the existing code, purely a TypeScript enhancement