feat(api-docs-module-crd): show field defaults and enum values

[alexalbu001]

What

The CRD schema view renders each property's type, description and required status, but not its default value or an enum's allowed values. This adds both.

• default and enum are carried through normalizeSchema using nullish coalescing, so a falsy default (false, 0, "") is preserved rather than dropped.
• The default is shown as a chip in the property header (next to the type and required chips); an enum's allowed values are listed in the property details.
• Both the Kubernetes CRD format and the simplified schema format are supported.

Why

kubebuilder-derived defaults are part of a CRD's contract (for example holdAtZero: false, replicas: 1). Today they are invisible in the API docs, so a user cannot tell a field's default without reading the raw CRD YAML.

Testing

• Added unit tests for default and enum rendering (both schema formats, including a regression guard for falsy defaults).
• yarn workspace @terasky/backstage-plugin-api-docs-module-crd test all pass
• yarn workspace @terasky/backstage-plugin-api-docs-module-crd lint clean
• yarn tsc clean

Docs updated: plugin README, site/docs/plugins/api-docs-module-crd/overview.md, and .../frontend/about.md.

Summary by CodeRabbit

• New Features

  • CRD property exploration now displays each property’s default value and allowed enum values.
  • Metadata is shown for both Kubernetes-format and simplified schema definitions, including falsy defaults such as false and explicitly configured null.
  • Array-item types are supported when presenting schema metadata.

• Documentation

  • Updated plugin documentation to describe default values and allowed enum values in rendered CRD schemas.

[coderabbitai]

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📒 Files selected for processing (1)

• plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx

🚧 Files skipped from review as they are similar to previous changes (1)

• plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx

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📝 Walkthrough

Walkthrough

The CRD schema widget now preserves and displays property default values and allowed enum values for Kubernetes-format and simplified schemas. Tests cover falsy defaults and enum rendering. Plugin documentation describes the new metadata.

Changes

CRD Schema Metadata

Layer / File(s)	Summary
Schema metadata normalization plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx	The internal schema model now includes default and enum metadata. Normalization preserves falsy values and formats defaults for display.
Schema metadata rendering plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx	SchemaPart renders default-value chips and allowed-value chips with new styles.
Feature validation and documentation plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.test.tsx, plugins/api-docs-module-crd/README.md, site/docs/plugins/api-docs-module-crd/...	Tests cover both schema formats, boolean defaults, string defaults, and enum values. Documentation describes the displayed metadata.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to a3dbb

The change adds CRD schema default and enum metadata display with no identified merge-blocking risk.

Sequence Diagram(s)

sequenceDiagram
  participant CRDSchema
  participant CrdDefinitionWidget
  participant SchemaPart
  participant RenderedSchema
  CRDSchema->>CrdDefinitionWidget: provide property schema
  CrdDefinitionWidget->>SchemaPart: process property metadata
  SchemaPart->>RenderedSchema: display default and allowed values

Loading

Poem

A rabbit hops through fields of code
Defaults shine along the schema road
Enum chips line up in a row
False stays false, as tests now show
CRD paths bloom where clean docs grow

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: displaying field default values and enum values in the CRD schema view.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In
`@plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx`:
- Line 216: Update the simplified-schema default selection in
CrdDefinitionWidget to choose schema.Default whenever that key is present, even
when its value is null, and otherwise fall back to schema.default. Add a test
covering a simplified schema with Default: null and verify it renders the
default chip through formatDefault.

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ℹ️ Review info

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Configuration used: Organization UI

Review profile: CHILL

Plan: Essentials

Run ID: 2ae64179-bc5e-48e0-a90d-5a38718f3cca

📥 Commits

Reviewing files that changed from the base of the PR and between 1c7ff9e and 9de4dee.

📒 Files selected for processing (6)

• plugins/api-docs-module-crd/README.md
• plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.test.tsx
• plugins/api-docs-module-crd/src/components/CrdDefinitionWidget/CrdDefinitionWidget.tsx
• site/docs/plugins/api-docs-module-crd/frontend/about.md
• site/docs/plugins/api-docs-module-crd/frontend/configure.md
• site/docs/plugins/api-docs-module-crd/overview.md

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[vrabbi]

Thanks for the contribution! The DCO bot is failing and we cant merge this until you signoff all the commits in your PR. Once you do that and all is green we will do a final review and get this merged.
Thanks!

[alexalbu001]

@vrabbi fixed!