Test: Support module mocking with conditional subpath imports in package.json

[kasperpeulen]

What I did

• This adds storybook, stories and the test condition to the webpack and vite builder. Allowing user to do conditional import maps in package.json to be used for module mocking use cases.
• Next.js: Add next/headers mocks #26750
• NextJS: Provide mocks for useRouter from next/router and next/navigation #26770
• Nextjs: Extend mocks for next/headers, next/router, next/navigation and next/cache #26815
• Action: Add new actions to the bottom of the panel and auto scroll #26864
• Next: Use <<package>>::<<import>> naming convention for mock names #26853
• Test: beforeEach as a story hook for imperative code #26789

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

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

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 pull request has been released as version 0.0.0-pr-26688-sha-553a642b. Try it out in a new sandbox by running npx storybook@0.0.0-pr-26688-sha-553a642b sandbox or in an existing project with npx storybook@0.0.0-pr-26688-sha-553a642b upgrade.

More information

Published version	0.0.0-pr-26688-sha-553a642b
Triggered by	@yannbf
Repository	storybookjs/storybook
Branch	kasper/module-mocking
Commit	553a642b
Datetime	Mon Apr 15 07:21:36 UTC 2024 (1713165696)
Workflow run	8685051027

To request a new release of this pull request, mention the @storybookjs/core team.

core team members can create a new canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=26688

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[JReinhold]

I didn't go through all the code again, just the important tests and stories.

Looks great 💪

[yannbf]

LGTM apart from the Vite conditions change I made a comment of