feat(react): Make structured activities defined by other than the standard constructor can be preloaded and cached

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🦋 Changeset detected

Latest commit: 3dc59ff

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@stackflow/react	Patch

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added preloading and caching capability for structured activities defined outside the standard constructor, improving load times for lazy-loaded activity components.

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Walkthrough

The changes implement a new preloading and caching system for structured activities. The getContentComponent function now returns both a Component and a preload function, replacing direct content() calls with standardized preload() pathways across loaders and preparation hooks. The preload function has been updated to handle both fulfilled and pending promises appropriately.

Changes

Cohort / File(s)	Summary
Release metadata \.changeset/yellow-geckos-warn\.md	New changeset documenting patch-level release describing preloading and caching capability for structured activities defined outside the standard constructor.
Core component type and utilities integrations/react/src/__internal__/StructuredActivityComponentType\.tsx, integrations/react/src/__internal__/utils/PreloadableLazyComponent\.tsx, integrations/react/src/__internal__/PluginRenderer\.tsx	getContentComponent return type expanded from Content<{}>["component"] to { Component: Content<{}>["component"]; preload: () => Promise<void> }. Removed caching wrapper around content property. Updated preload function to check promise fulfillment state and conditionally return sync or async resolution. PluginRenderer now destructures { Component } from getContentComponent result.
Loaders and hooks integrations/react/src/future/loader/loaderPlugin\.tsx, integrations/react/src/future/usePrepare\.ts	Both files updated to use getContentComponent(...).preload() instead of direct content() invocation. getContentComponent added to imports from StructuredActivityComponentType module. Preloading pathway now gated by structured activity component check.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.
Description check	❓ Inconclusive	The pull request lacks a description; no information is provided to assess its relevance to the changeset.	Add a pull request description explaining the motivation, implementation approach, and any breaking changes or migration guidance.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: enabling preloading and caching of structured activities defined outside the standard constructor.

✨ Finishing touches

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📥 Commits

Reviewing files that changed from the base of the PR and between 57fd2da and 3dc59ff.

📒 Files selected for processing (6)

• .changeset/yellow-geckos-warn.md
• integrations/react/src/__internal__/PluginRenderer.tsx
• integrations/react/src/__internal__/StructuredActivityComponentType.tsx
• integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx
• integrations/react/src/future/loader/loaderPlugin.tsx
• integrations/react/src/future/usePrepare.ts

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📓 Path-based instructions (3)

.changeset/*.md

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Include a Changeset entry for any user-facing package change

Files:

• .changeset/yellow-geckos-warn.md

**/*.{ts,tsx}

📄 CodeRabbit inference engine (AGENTS.md)

Write source in TypeScript with strict typing enabled across the codebase

Files:

• integrations/react/src/__internal__/PluginRenderer.tsx
• integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx
• integrations/react/src/__internal__/StructuredActivityComponentType.tsx
• integrations/react/src/future/usePrepare.ts
• integrations/react/src/future/loader/loaderPlugin.tsx

integrations/react/**/*.tsx

📄 CodeRabbit inference engine (AGENTS.md)

Use .tsx files for React components and JSX in the React integration package

Files:

• integrations/react/src/__internal__/PluginRenderer.tsx
• integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx
• integrations/react/src/__internal__/StructuredActivityComponentType.tsx
• integrations/react/src/future/loader/loaderPlugin.tsx

🧬 Code graph analysis (5)

integrations/react/src/__internal__/PluginRenderer.tsx (1)

integrations/react/src/__internal__/StructuredActivityComponentType.tsx (2)

• getContentComponent (68-100)
• structuredActivityComponent (27-41)

integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx (1)

integrations/react/src/__internal__/utils/SyncInspectablePromise.ts (4)

• inspect (29-49)
• PromiseStatus (9-13)
• PromiseStatus (14-14)
• resolve (80-91)

integrations/react/src/__internal__/StructuredActivityComponentType.tsx (1)

integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx (1)

• preloadableLazyComponent (10-44)

integrations/react/src/future/usePrepare.ts (1)

integrations/react/src/__internal__/StructuredActivityComponentType.tsx (1)

• getContentComponent (68-100)

integrations/react/src/future/loader/loaderPlugin.tsx (1)

integrations/react/src/__internal__/StructuredActivityComponentType.tsx (1)

• getContentComponent (68-100)

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• GitHub Check: Cloudflare Pages

🔇 Additional comments (9)

.changeset/yellow-geckos-warn.md (1)

1-5: LGTM!

The changeset correctly documents a patch-level release for @stackflow/react with a clear description of the new preloading and caching capability for structured activities.

integrations/react/src/__internal__/PluginRenderer.tsx (1)

90-92: LGTM!

The destructuring correctly adapts to the new { Component, preload } return type from getContentComponent, extracting only the Component property needed for rendering.

integrations/react/src/__internal__/utils/PreloadableLazyComponent.tsx (1)

34-42: LGTM!

The preload function implementation correctly handles both scenarios:

• Returns an immediately resolved Promise<void> when the component is already loaded (efficient fast-path)
• Returns a promise that resolves to undefined when still pending

This aligns well with the new preload-based API pattern.

integrations/react/src/future/loader/loaderPlugin.tsx (2)

7-10: LGTM!

The import is correctly updated to include getContentComponent alongside the existing isStructuredActivityComponent import.

---

117-125: LGTM!

The switch from direct content() invocation to getContentComponent(matchActivityComponent).preload() correctly implements the new centralized preloading pattern. The conditional check for function-based content remains appropriate to distinguish lazy-loadable content from eagerly-defined content.

integrations/react/src/__internal__/StructuredActivityComponentType.tsx (2)

63-66: LGTM!

The ContentComponentMap type correctly updated to store the new { Component, preload } shape, ensuring type safety for the caching mechanism.

---

68-99: LGTM!

The getContentComponent implementation is well-structured:

• Proper cache-first lookup with the WeakMap
• Handles both eager (Content<P>) and lazy (() => Promise<...>) content definitions
• Correctly delegates to preloadableLazyComponent for unified preload behavior
• Promise state handling covers fulfilled, rejected, and pending cases appropriately

integrations/react/src/future/usePrepare.ts (2)

7-10: LGTM!

The import correctly updated to include getContentComponent for the new preload API.

---

49-56: LGTM!

The refactoring from direct content() invocation to getContentComponent(...).preload() correctly aligns with the centralized preloading pattern. This ensures consistent caching behavior across both the loader plugin and the prepare hook.

---

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