73 lines
3.4 KiB
JavaScript
73 lines
3.4 KiB
JavaScript
import React, { use, useMemo } from 'react';
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import { isThenable } from '../../shared/lib/is-thenable';
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// The app router state lives outside of React, so we can import the dispatch
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// method directly wherever we need it, rather than passing it around via props
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// or context.
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let dispatch = null;
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export function dispatchAppRouterAction(action) {
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if (dispatch === null) {
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throw Object.defineProperty(new Error('Internal Next.js error: Router action dispatched before initialization.'), "__NEXT_ERROR_CODE", {
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value: "E668",
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enumerable: false,
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configurable: true
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});
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}
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dispatch(action);
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}
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const __DEV__ = process.env.NODE_ENV !== 'production';
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const promisesWithDebugInfo = __DEV__ ? new WeakMap() : null;
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export function useActionQueue(actionQueue) {
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const [state, setState] = React.useState(actionQueue.state);
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// Because of a known issue that requires to decode Flight streams inside the
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// render phase, we have to be a bit clever and assign the dispatch method to
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// a module-level variable upon initialization. The useState hook in this
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// module only exists to synchronize state that lives outside of React.
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// Ideally, what we'd do instead is pass the state as a prop to root.render;
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// this is conceptually how we're modeling the app router state, despite the
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// weird implementation details.
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if (process.env.NODE_ENV !== 'production') {
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const { useAppDevRenderingIndicator } = require('../../next-devtools/userspace/use-app-dev-rendering-indicator');
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// eslint-disable-next-line react-hooks/rules-of-hooks
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const appDevRenderingIndicator = useAppDevRenderingIndicator();
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dispatch = (action)=>{
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appDevRenderingIndicator(()=>{
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actionQueue.dispatch(action, setState);
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});
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};
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} else {
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dispatch = (action)=>actionQueue.dispatch(action, setState);
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}
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// When navigating to a non-prefetched route, then App Router state will be
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// blocked until the server responds. We need to transfer the `_debugInfo`
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// from the underlying Flight response onto the top-level promise that is
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// passed to React (via `use`) so that the latency is accurately represented
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// in the React DevTools.
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const stateWithDebugInfo = useMemo(()=>{
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if (!__DEV__) {
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return state;
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}
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if (isThenable(state)) {
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// useMemo can't be used to cache a Promise since the memoized value is thrown
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// away when we suspend. So we use a WeakMap to cache the Promise with debug info.
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let promiseWithDebugInfo = promisesWithDebugInfo.get(state);
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if (promiseWithDebugInfo === undefined) {
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const debugInfo = [];
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promiseWithDebugInfo = Promise.resolve(state).then((asyncState)=>{
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if (asyncState.debugInfo !== null) {
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debugInfo.push(...asyncState.debugInfo);
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}
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return asyncState;
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});
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promiseWithDebugInfo._debugInfo = debugInfo;
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promisesWithDebugInfo.set(state, promiseWithDebugInfo);
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}
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return promiseWithDebugInfo;
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}
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return state;
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}, [
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state
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]);
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return isThenable(stateWithDebugInfo) ? use(stateWithDebugInfo) : stateWithDebugInfo;
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}
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//# sourceMappingURL=use-action-queue.js.map
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