Support the bundle_size_exception capability - #8335
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Adds ui_extension_bundle_size_exception to the extension capabilities schema so extensions declaring it in shopify.extension.toml include it in the configuration deployed to Shopify. The backend raises the Remote DOM compressed bundle size limit for extensions declaring this capability when the app has been granted a bundle size exception approval scope by Shopify. Intentionally undocumented: grants are shared directly with partners who requested an exception.
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Pull request overview
This pull request adds support for the bundle_size_exception UI extension capability by extending the CLI’s capabilities schema so the key is not stripped during configuration parsing and is included in the deploy payload.
Changes:
- Add
bundle_size_exception?: booleantoCapabilitiesSchemaso it is preserved in extension configuration. - Add a unit test ensuring
bundle_size_exceptionappears in the UI extension deploy config. - Add a changeset to publish the capability support as a user-facing change.
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| packages/app/src/cli/models/extensions/specifications/ui_extension.test.ts | Adds a deploy-config unit test verifying bundle_size_exception is preserved and sent. |
| packages/app/src/cli/models/extensions/schemas.ts | Extends CapabilitiesSchema with the new optional boolean capability. |
| .changeset/spicy-crabs-bundle.md | Declares a version bump to release support for the new capability. |
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Why
Shopify can grant specific apps an exception to the UI extension bundle size limit, applied per extension through the
bundle_size_exceptioncapability inshopify.extension.toml. The capabilities schema strips unknown keys, so without this change the capability never reaches the extension configuration deployed to Shopify and the exception can't take effect. Enforcement is entirely server-side; the exception is granted by Shopify directly to the affected apps.What
bundle_size_exceptionas an optional boolean toCapabilitiesSchema.Testing
shopify.extension.toml, add:shopify app deploy(or inspect the module config sent to App Management) and verify the capability is present in the extension's configuration instead of being stripped.pnpm vitest run src/cli/models/extensions/specifications/ui_extension.test.tsinpackages/app.