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import {
ACTION_NAVIGATE,
ACTION_SERVER_PATCH,
ACTION_RESTORE,
ACTION_REFRESH,
ACTION_PREFETCH,
ACTION_HMR_REFRESH,
ACTION_SERVER_ACTION,
} from './router-reducer-types'
import type {
ReducerActions,
ReducerState,
ReadonlyReducerState,
} from './router-reducer-types'
import { navigateReducer } from './reducers/navigate-reducer'
import { serverPatchReducer } from './reducers/server-patch-reducer'
import { restoreReducer } from './reducers/restore-reducer'
import { refreshReducer } from './reducers/refresh-reducer'
import { prefetchReducer } from './reducers/prefetch-reducer'
import { hmrRefreshReducer } from './reducers/hmr-refresh-reducer'
import { serverActionReducer } from './reducers/server-action-reducer'
/**
* Reducer that handles the app-router state updates.
*/
function clientReducer(
state: ReadonlyReducerState,
action: ReducerActions
): ReducerState {
switch (action.type) {
case ACTION_NAVIGATE: {
return navigateReducer(state, action)
}
case ACTION_SERVER_PATCH: {
return serverPatchReducer(state, action)
}
case ACTION_RESTORE: {
return restoreReducer(state, action)
}
case ACTION_REFRESH: {
return refreshReducer(state, action)
}
case ACTION_HMR_REFRESH: {
return hmrRefreshReducer(state, action)
}
case ACTION_PREFETCH: {
return prefetchReducer(state, action)
}
case ACTION_SERVER_ACTION: {
return serverActionReducer(state, action)
}
// This case should never be hit as dispatch is strongly typed.
default:
throw new Error('Unknown action')
}
}
function serverReducer(
state: ReadonlyReducerState,
_action: ReducerActions
): ReducerState {
return state
}
// we don't run the client reducer on the server, so we use a noop function for better tree shaking
export const reducer =
typeof window === 'undefined' ? serverReducer : clientReducer
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