Fix ui_extension manifest.json

[vividviolet]

WHY are these changes introduced?

The manifest.json was being generated inside /dist even though /dist should only affect the bundle_ui step. Manifest files should be generated in the root of the bundle for consistency.

Before

admin_link

{
  "admin.app.intent.link": {
    "tools": "tools.json",
    "instructions": "instructions.md",
    "intents": [
      {
        "schema": "intent-schema.json"
      }
    ]
  }
}

ui_extension

{
  "admin.app.tools.data": {
    "main": "app-tools.js",
    "tools": "tools.json",
    "instructions": "instructions.md"
  }
}

After

admin_link (unchanged)

{
  "admin.app.intent.link": {
    "tools": "tools.json",
    "instructions": "instructions.md",
    "intents": [
      {
        "schema": "intent-schema.json"
      }
    ]
  }
}

ui_extension

{
  "admin.app.tools.data": {
    "main": "dist/app-tools.js",
    "tools": "tools.json",
    "instructions": "instructions.md"
  }
}

WHAT is this pull request doing?

• Add bundleRoot property to ExtensionInstance to track the root directory for bundled extensions
• Add localOutputPath getter that consistently resolves the extension's local output path
• Refactor buildForBundle and copyIntoBundle methods to use bundleRoot for determining bundle locations
• Update asset inclusion steps to write static assets to bundleRoot instead of output directory
• Modify manifest generation to write manifest.json to bundleRoot
• Update bundle UI step to rewrite asset paths relative to bundle root for consistent resolution
• Remove bundlePath parameter from payload generation functions since extensions now track their own bundle locations
• Fix asset payload generation to use correct file paths for timestamp resolution

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing, so I've added a changelog entry with pnpm changeset add

[vividviolet]

• Fix ui_extension manifest.json #7339 👈 (View in Graphite)
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[vividviolet]

/snapit

[github-actions]

🫰✨ Thanks @vividviolet! Your snapshot has been published to npm.

Test the snapshot by installing your package globally:

pnpm i -g --@shopify:registry=https://registry.npmjs.org @shopify/cli@0.0.0-snapshot-20260417020303

Caution

After installing, validate the version by running shopify version in your terminal.
If the versions don't match, you might have multiple global instances installed.
Use which shopify to find out which one you are running and uninstall it.

[vividviolet]

This was being repeated everywhere so I made a getter for it

[vividviolet]

This fixes a bug where the main asset appears to always update even though the JS files have not changed