Reactの内部実装を見ていくよ(useStateフック&ステート更新からのトリガーフェーズ)

export function renderWithHooks<Props, SecondArg>( current: Fiber | null, workInProgress: Fiber, Component: (p: Props, arg: SecondArg) => any, props: Props, secondArg: SecondArg, nextRenderLanes: Lanes, ): any { renderLanes = nextRenderLanes; currentlyRenderingFiber = workInProgress; (省略) if (__DEV__) { if (current !== null && current.memoizedState !== null) { ReactSharedInternals.H = HooksDispatc