Files
supabase/packages/common/hooks/useConstant.ts
Gildas Garcia 86a3f8b03d chore: upgrade to react-19 (#45886)
- Most changes are related to either types or `useRef` usages (it now
requires an initial value).
- also updated `vaul` to its latest version and haven't noticed any
change ([design-system
demo](https://design-system-git-react-19-supabase.vercel.app/design-system/docs/components/drawer))

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
  * Upgraded workspace to React 19.

* **Bug Fixes**
* Improved null-safety and ref handling across editors, UI components,
shortcuts, and markdown/image rendering to reduce runtime errors.
* Safer event/timeout/interval cleanup and more robust command/context
handling.

* **Chores**
  * Bumped vaul dependency versions.

* **Documentation**
* Type and TypeScript accuracy improvements for clearer developer
feedback.

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[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/supabase/supabase/pull/45886)

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<!-- end of auto-generated comment: release notes by coderabbit.ai -->
2026-05-15 16:04:41 +02:00

20 lines
365 B
TypeScript

'use client'
// based on https://github.com/Andarist/use-constant
import { useRef } from 'react'
type ResultBox<T> = { v: T }
/**
* React hook for creating a value exactly once
*/
export function useConstant<T>(fn: () => T): T {
const ref = useRef<ResultBox<T> | null>(null)
if (!ref.current) {
ref.current = { v: fn() }
}
return ref.current.v
}