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Keep useTransition backward compatibility and add startTransition #142

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Keep useTransition backward compatibility and add startTransition #142

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f49a463
Keep `useTransition` backward compatibility
stephanoskomnenos Jun 27, 2025
a9c7bb1
Add `startTransition`
stephanoskomnenos Jun 27, 2025
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14 changes: 12 additions & 2 deletions src/React.res
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Original file line number Diff line number Diff line change
Expand Up @@ -411,13 +411,23 @@ external displayName: component<'props> => option<string> = "displayName"

// Actions

type transitionFunction = unit => promise<unit>

type transitionFunction = unit => unit
type transitionStartFunction = transitionFunction => unit

type transitionFunctionAsync = unit => promise<unit>
type transitionStartFunctionAsync = transitionFunctionAsync => unit

/** `startTransition` lets you render a part of the UI in the background. */
@module("react")
external startTransition: transitionStartFunction = "startTransition"
@module("react")
external startTransitionAsync: transitionStartFunctionAsync = "startTransition"

/** `useTransition` is a React Hook that lets you render a part of the UI in the background. */
@module("react")
external useTransition: unit => (bool, transitionStartFunction) = "useTransition"
@module("react")
external useTransitionAsync: unit => (bool, transitionStartFunctionAsync) = "useTransition"

type action<'state, 'payload> = ('state, 'payload) => promise<'state>

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