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import type { Dispatch } from 'react'
import React, { use } from 'react'
import { isThenable } from '../../shared/lib/is-thenable'
import type { AppRouterActionQueue } from './app-router-instance'
import type {
AppRouterState,
ReducerActions,
ReducerState,
} from './router-reducer/router-reducer-types'
// The app router state lives outside of React, so we can import the dispatch
// method directly wherever we need it, rather than passing it around via props
// or context.
let dispatch: Dispatch<ReducerActions> | null = null
export function dispatchAppRouterAction(action: ReducerActions) {
if (dispatch === null) {
throw new Error(
'Internal Next.js error: Router action dispatched before initialization.'
)
}
dispatch(action)
}
export function useActionQueue(
actionQueue: AppRouterActionQueue
): AppRouterState {
const [state, setState] = React.useState<ReducerState>(actionQueue.state)
// Because of a known issue that requires to decode Flight streams inside the
// render phase, we have to be a bit clever and assign the dispatch method to
// a module-level variable upon initialization. The useState hook in this
// module only exists to synchronize state that lives outside of React.
// Ideally, what we'd do instead is pass the state as a prop to root.render;
// this is conceptually how we're modeling the app router state, despite the
// weird implementation details.
if (process.env.NODE_ENV !== 'production') {
const { useAppDevRenderingIndicator } =
require('../../next-devtools/userspace/use-app-dev-rendering-indicator') as typeof import('../../next-devtools/userspace/use-app-dev-rendering-indicator')
// eslint-disable-next-line react-hooks/rules-of-hooks
const appDevRenderingIndicator = useAppDevRenderingIndicator()
dispatch = (action: ReducerActions) => {
appDevRenderingIndicator(() => {
actionQueue.dispatch(action, setState)
})
}
} else {
dispatch = (action: ReducerActions) =>
actionQueue.dispatch(action, setState)
}
return isThenable(state) ? use(state) : state
}
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