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This changes the API of `usePathname` to return `string | null` to support hybrid use-cases where the pathname is unknown at build time (during automatic static optimization and when fallback is set true with dynamic parameters in the pathname). This supports a cleaner DX experience for those moving from `pages/` to `app/` so they can begin to use `usePathname` in components that are shared across them.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| import type { ParsedUrlQuery } from 'node:querystring' | ||
| import React, { useMemo, useRef } from 'react' | ||
| import type { AppRouterInstance } from '../app-router-context' | ||
| import { PathnameContext } from '../hooks-client-context' | ||
| import type { NextRouter } from './router' | ||
| import { isDynamicRoute } from './utils' | ||
|
|
||
| /** | ||
| * adaptForAppRouterInstance implements the AppRouterInstance with a NextRouter. | ||
| * | ||
| * @param router the NextRouter to adapt | ||
| * @returns an AppRouterInstance | ||
| */ | ||
| export function adaptForAppRouterInstance( | ||
| router: NextRouter | ||
| ): AppRouterInstance { | ||
| return { | ||
| back(): void { | ||
| router.back() | ||
| }, | ||
| forward(): void { | ||
| router.forward() | ||
| }, | ||
| refresh(): void { | ||
| router.reload() | ||
| }, | ||
| push(href: string): void { | ||
| void router.push(href) | ||
| }, | ||
| replace(href: string): void { | ||
| void router.replace(href) | ||
| }, | ||
| prefetch(href: string): void { | ||
| void router.prefetch(href) | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * transforms the ParsedUrlQuery into a URLSearchParams. | ||
| * | ||
| * @param query the query to transform | ||
| * @returns URLSearchParams | ||
| */ | ||
| function transformQuery(query: ParsedUrlQuery): URLSearchParams { | ||
| const params = new URLSearchParams() | ||
|
|
||
| for (const [name, value] of Object.entries(query)) { | ||
| if (Array.isArray(value)) { | ||
| for (const val of value) { | ||
| params.append(name, val) | ||
| } | ||
| } else if (typeof value !== 'undefined') { | ||
| params.append(name, value) | ||
| } | ||
| } | ||
|
|
||
| return params | ||
| } | ||
|
|
||
| /** | ||
| * adaptForSearchParams transforms the ParsedURLQuery into URLSearchParams. | ||
| * | ||
| * @param router the router that contains the query. | ||
| * @returns the search params in the URLSearchParams format | ||
| */ | ||
| export function adaptForSearchParams( | ||
| router: Pick<NextRouter, 'isReady' | 'query'> | ||
| ): URLSearchParams { | ||
| if (!router.isReady || !router.query) { | ||
| return new URLSearchParams() | ||
| } | ||
|
|
||
| return transformQuery(router.query) | ||
| } | ||
|
|
||
| export function PathnameContextProviderAdapter({ | ||
| children, | ||
| router, | ||
| ...props | ||
| }: React.PropsWithChildren<{ | ||
| router: Pick<NextRouter, 'pathname' | 'asPath' | 'isReady' | 'isFallback'> | ||
| isAutoExport: boolean | ||
| }>) { | ||
| const ref = useRef(props.isAutoExport) | ||
| const value = useMemo(() => { | ||
| // isAutoExport is only ever `true` on the first render from the server, | ||
| // so reset it to `false` after we read it for the first time as `true`. If | ||
| // we don't use the value, then we don't need it. | ||
| const isAutoExport = ref.current | ||
| if (isAutoExport) { | ||
| ref.current = false | ||
| } | ||
|
|
||
| // When the route is a dynamic route, we need to do more processing to | ||
| // determine if we need to stop showing the pathname. | ||
| if (isDynamicRoute(router.pathname)) { | ||
| // When the router is rendering the fallback page, it can't possibly know | ||
| // the path, so return `null` here. Read more about fallback pages over | ||
| // at: | ||
| // https://nextjs.org/docs/api-reference/data-fetching/get-static-paths#fallback-pages | ||
| if (router.isFallback) { | ||
| return null | ||
| } | ||
|
|
||
| // When `isAutoExport` is true, meaning this is a page page has been | ||
| // automatically statically optimized, and the router is not ready, then | ||
| // we can't know the pathname yet. Read more about automatic static | ||
| // optimization at: | ||
| // https://nextjs.org/docs/advanced-features/automatic-static-optimization | ||
| if (isAutoExport && !router.isReady) { | ||
| return null | ||
| } | ||
| } | ||
|
|
||
| // The `router.asPath` contains the pathname seen by the browser (including | ||
| // any query strings), so it should have that stripped. Read more about the | ||
| // `asPath` option over at: | ||
| // https://nextjs.org/docs/api-reference/next/router#router-object | ||
| const url = new URL(router.asPath, 'http://f') | ||
| return url.pathname | ||
| }, [router.asPath, router.isFallback, router.isReady, router.pathname]) | ||
|
|
||
| return ( | ||
| <PathnameContext.Provider value={value}> | ||
| {children} | ||
| </PathnameContext.Provider> | ||
| ) | ||
| } |