示例

Assert React 19 use hook Promise suspension, Context conditional reading, and useActionState transition lifecycle

sha256:418b9ce47941deff2d6d32254d34087a6b845ca629a66090c33938490e12fbb3

MIT-0

执行证据

声明的环境与签名的运行分开呈现，你可以看到这个样本究竟运行了什么、在哪里运行。

声明的环境 node 22.23 linux 24 · ubuntu · glibc 2.39 x64 node 22.23 javascript npm 10

环境	契约	阶段	运行日期
node 22 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · node-typescript@1node:22-alpine@sha256:c610fcdfb1d5…	2026-08-26

HOW

目标: Assert React 19 use hook Promise suspension, Context conditional reading, and useActionState transition lifecycle
包: react 19.2.8
符号: use
useActionState
环境: node 22.23.2
创建时间: 2026-08-26T07:13:42Z

React 19.2.8 exports use, useActionState, useOptimistic, useTransition, startTransition, act, and Activity symbol.
Invoking use, useActionState, useOptimistic, or useTransition outside a React hook dispatcher throws TypeError when dispatcher is null.
startTransition executes callbacks synchronously while setting transition context, and returns undefined for asynchronous transition callbacks.
act executes callbacks and returns a thenable object for both synchronous and asynchronous functions.
use(Context) reads the context value from the context instance and can be invoked conditionally inside branching logic.
use(Promise) unwraps fulfilled promises synchronously, suspends pending promises by throwing the promise, and throws rejection reasons on rejected promises.
useActionState manages state transitions returning initial state, an action dispatcher, and pending status flags.
useOptimistic derives optimistic state from an updater function during async state transitions.

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