fix(react-form-devtools): re-mount Solid component on theme change (closes #2357) - #2371
fix(react-form-devtools): re-mount Solid component on theme change (closes #2357)#2371dikshit-n wants to merge 3 commits into
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ChangesForm Devtools Theme Lifecycle
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to Theme-related rerenders may leave the Form DevTools panel blank even when the theme has not changed. This should be corrected before merge to preserve panel availability. Sequence Diagram(s)sequenceDiagram
participant TanStackDevtools
participant FormDevtoolsPanel
participant FormDevtoolsCore
TanStackDevtools->>FormDevtoolsPanel: Render with theme
FormDevtoolsPanel->>FormDevtoolsCore: Mount with element and theme
TanStackDevtools->>FormDevtoolsPanel: Render with changed theme
FormDevtoolsPanel->>FormDevtoolsCore: Unmount previous instance
FormDevtoolsPanel->>FormDevtoolsCore: Mount new instance with theme
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✅ Passed checks (4 passed)
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Inline comments:
In `@packages/react-form-devtools/src/FormDevtools.tsx`:
- Line 35: Remove prevThemeRef and the theme-equality early return from the
effect in FormDevtools, allowing the effect body to remount FormDevtoolsCore
after cleanup on every relevant props change, including an initially undefined
theme.
In `@packages/react-form-devtools/tests/formDevtools.spec.tsx`:
- Around line 14-18: Update the test around FormDevtoolsCore to render
FormDevtoolsPanel with the mocked core, then rerender with changed props while
keeping the same theme and again with a changed theme. Assert the mock receives
the expected mount and unmount calls across these lifecycle transitions, rather
than only checking that FormDevtoolsCore methods exist.
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packages/react-form-devtools/src/FormDevtools.tsxpackages/react-form-devtools/src/plugin.tsxpackages/react-form-devtools/tests/formDevtools.spec.tsx
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…loses TanStack#2357) Root cause: The original createReactPlugin factory returned a render() function that created a new React element on every theme change, but the original createReactPanel hook only called mount() once. The Solid FormDevtoolsCore component received props.theme as a plain value and never re-rendered, leaving the Form DevTools stuck in light mode. Fix: Replace the createReactPlugin factory with a direct FormDevtoolsPanel component that uses useEffect with the theme prop in its dependency array. When the theme changes, the cleanup unmounts the old Solid component and the effect body calls mount() with the updated props, ensuring the Solid Devtools always starts fresh with the correct theme value. Closes TanStack#2357
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Inline comments:
In `@packages/react-form-devtools/src/FormDevtools.tsx`:
- Line 24: Export the FormDevtoolsPanel and FormDevtoolsPanelNoOp component
declarations so the Devtools.FormDevtoolsPanel and
Devtools.FormDevtoolsPanelNoOp references in the package entry point resolve
correctly.
- Line 44: Update the effect containing devtools.current.mount to return a
cleanup function that calls devtools.current.unmount when the FormDevtools panel
is removed, ensuring the mounted Solid tree and its resources are released.
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Address follow-up CodeRabbit review on TanStack#2371: - Export FormDevtoolsPanel / FormDevtoolsPanelNoOp directly so module resolution in src/index.ts is unambiguous across all TS module resolution modes (CRITICAL). - Return a cleanup function from the useEffect so the Solid FormDevtoolsCore is unmounted on both theme change and component teardown, preventing a leaked Solid tree (MAJOR). - Replace the previous mock-only test with a real @testing-library/react + jsdom integration test that asserts the actual lifecycle: same-theme rerender does not remount, theme change unmounts old + mounts new, and component teardown calls unmount exactly once. Refs: TanStack#2371, TanStack#2357
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Fixed in commit e18edf1 on top of the PR branch. Three changes: 1. Critical — Export the panel components 2. Major — Return an effect cleanup function 3. Major — Real integration test
The earlier note that |
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Inline comments:
In `@packages/react-form-devtools/tests/formDevtools.spec.tsx`:
- Line 80: Update the test assertion for darkInstance.mount to verify it was
called with props containing theme: 'dark', while retaining the existing
single-call assertion.
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- packages/react-form-devtools/src/FormDevtools.tsx
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Summary
Fix the Form DevTools panel so it updates its theme when the TanStack DevTools outer shell switches between light and dark mode.
Closes #2357
Problem
When using
formDevtoolsPlugin()inside TanStack DevTools, the Form DevTools panel is always rendered in light mode — even when the TanStack DevTools outer shell is switched to dark mode. The theme is frozen at the value passed on first mount.Root cause: The original
createReactPluginfactory returned a plugin object whoserender()function created a new React element on every theme change. However, the underlyingcreateReactPanelhook only calledmount()on the SolidFormDevtoolsCoreclass once (on first mount). The Solid component receivedprops.themeas a plain (non-reactive) value, so it never re-rendered when the theme prop changed.Solution
Replace the
createReactPluginfactory approach with a directFormDevtoolsPanelReact component that usesuseEffectwith thethemeprop in its dependency array:themechanges, the cleanup function unmounts the old Solid componentmount()again with the updatedpropsDevtoolscomponent receives the freshprops.themevalue and itsThemeContextProviderupdates with the correct themeThis mirrors the
TanstackQueryDevtoolsPanelclass pattern used by@tanstack/query-devtools, where a class manages the Solid component lifecycle and re-mounts it on theme changes.Changes Made
packages/react-form-devtools/src/FormDevtools.tsx: Rewrite the panel component with auseEffectthat tracksprops.themein its dependency array, unmounting and re-mounting the SolidFormDevtoolsCoreon every theme change. AddedprevThemeRefto skip unnecessary re-mounts when the theme value has not actually changed.packages/react-form-devtools/src/plugin.tsx: Updated the plugin factory with clear comments documenting the bug and fix.packages/react-form-devtools/tests/formDevtools.spec.tsx: Added a test verifying thatFormDevtoolsCoreis importable and itsmount/unmountcontract is correct.Testing
FormDevtoolsCorecan be imported and instantiated withmount/unmountmethods.pnpm test:lib— 3 tasks, 100% success).pnpm test:eslint— no errors).pnpm build:all— 14 tasks, 100% success).Checklist
Summary by CodeRabbit
Bug Fixes
Tests