Add locale false handling

packages/next/client/index.tsx

@@ -86,11 +86,11 @@ if (hasBasePath(asPath)) {
 if (process.env.__NEXT_I18N_SUPPORT) {
   const {
     normalizeLocalePath,
-  } = require('../next-server/lib/i18n/normalize-locale-path')
+  } = require('../next-server/lib/i18n/normalize-locale-path') as typeof import('../next-server/lib/i18n/normalize-locale-path')
 
   const {
     detectDomainLocale,
-  } = require('../next-server/lib/i18n/detect-domain-locale')
+  } = require('../next-server/lib/i18n/detect-domain-locale') as typeof import('../next-server/lib/i18n/detect-domain-locale')
 
   if (locales) {
     const localePathResult = normalizeLocalePath(asPath, locales)
@@ -106,7 +106,7 @@ if (process.env.__NEXT_I18N_SUPPORT) {
 
     // attempt detecting default locale based on hostname
     const detectedDomain = detectDomainLocale(
-      process.env.__NEXT_I18N_DOMAINS,
+      process.env.__NEXT_I18N_DOMAINS as any,
       window.location.hostname
     )
 

packages/next/client/link.tsx

@@ -26,7 +26,7 @@ export type LinkProps = {
   shallow?: boolean
   passHref?: boolean
   prefetch?: boolean
-  locale?: string
+  locale?: string | false
 }
 type LinkPropsRequired = RequiredKeys<LinkProps>
 type LinkPropsOptional = OptionalKeys<LinkProps>
@@ -127,7 +127,7 @@ function linkClicked(
   replace?: boolean,
   shallow?: boolean,
   scroll?: boolean,
-  locale?: string
+  locale?: string | false
 ): void {
   const { nodeName } = e.currentTarget
 
@@ -344,7 +344,7 @@ function Link(props: React.PropsWithChildren<LinkProps>) {
     childProps.href = addBasePath(
       addLocale(
         as,
-        locale || (router && router.locale),
+        typeof locale !== 'undefined' ? locale : router && router.locale,
         router && router.defaultLocale
       )
     )

packages/next/next-server/lib/router/router.ts

@@ -29,7 +29,7 @@ import escapePathDelimiters from './utils/escape-path-delimiters'
 
 interface TransitionOptions {
   shallow?: boolean
-  locale?: string
+  locale?: string | false
 }
 
 interface NextHistoryState {
@@ -58,7 +58,7 @@ function addPathPrefix(path: string, prefix?: string) {
 
 export function addLocale(
   path: string,
-  locale?: string,
+  locale?: string | false,
   defaultLocale?: string
 ) {
   if (process.env.__NEXT_I18N_SUPPORT) {
@@ -553,6 +553,7 @@ export default class Router implements BaseRouter {
       as,
       Object.assign({}, options, {
         shallow: options.shallow && this._shallow,
+        locale: options.locale || this.defaultLocale,
       })
     )
   }
@@ -600,7 +601,25 @@ export default class Router implements BaseRouter {
       window.location.href = url
       return false
     }
-    this.locale = options.locale || this.locale
+
+    if (process.env.__NEXT_I18N_SUPPORT) {
+      this.locale = options.locale || this.locale
+
+      if (typeof options.locale === 'undefined') {
+        options.locale = this.locale
+      }
+
+      const {
+        normalizeLocalePath,
+      } = require('../i18n/normalize-locale-path') as typeof import('../i18n/normalize-locale-path')
+
+      const localePathResult = normalizeLocalePath(as, this.locales)
+
+      if (localePathResult.detectedLocale) {
+        this.locale = localePathResult.detectedLocale
+        url = localePathResult.pathname
+      }
+    }
 
     if (!(options as any)._h) {
       this.isSsr = false
@@ -614,7 +633,7 @@ export default class Router implements BaseRouter {
       this.abortComponentLoad(this._inFlightRoute)
     }
 
-    as = addLocale(as, this.locale, this.defaultLocale)
+    as = addLocale(as, options.locale, this.defaultLocale)
     const cleanedAs = delLocale(
       hasBasePath(as) ? delBasePath(as) : as,
       this.locale
@@ -811,7 +830,7 @@ export default class Router implements BaseRouter {
       this.changeState(
         method,
         url,
-        addLocale(as, this.locale, this.defaultLocale),
+        addLocale(as, options.locale, this.defaultLocale),
         options
       )
 

test/integration/i18n-support/pages/locale-false.js

@@ -0,0 +1,54 @@
+import Link from 'next/link'
+import { useRouter } from 'next/router'
+
+export default function Page(props) {
+  const router = useRouter()
+  const { nextLocale } = router.query
+
+  return (
+    <>
+      <p id="links">links page</p>
+      <p id="props">{JSON.stringify(props)}</p>
+      <p id="router-locale">{router.locale}</p>
+      <p id="router-locales">{JSON.stringify(router.locales)}</p>
+      <p id="router-query">{JSON.stringify(router.query)}</p>
+      <p id="router-pathname">{router.pathname}</p>
+      <p id="router-as-path">{router.asPath}</p>
+      <Link href={`/${nextLocale}/another`} locale={false}>
+        <a id="to-another">to /another</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gsp`} locale={false}>
+        <a id="to-gsp">to /gsp</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gsp/fallback/first`} locale={false}>
+        <a id="to-fallback-first">to /gsp/fallback/first</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gsp/fallback/hello`} locale={false}>
+        <a id="to-fallback-hello">to /gsp/fallback/hello</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gsp/no-fallback/first`} locale={false}>
+        <a id="to-no-fallback-first">to /gsp/no-fallback/first</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gssp`} locale={false}>
+        <a id="to-gssp">to /gssp</a>
+      </Link>
+      <br />
+      <Link href={`/${nextLocale}/gssp/first`} locale={false}>
+        <a id="to-gssp-slug">to /gssp/first</a>
+      </Link>
+      <br />
+    </>
+  )
+}
+
+// make SSR page so we have query values immediately
+export const getServerSideProps = () => {
+  return {
+    props: {},
+  }
+}

test/integration/i18n-support/test/index.test.js

@@ -167,6 +167,7 @@ function runTests(isDev) {
   it('should navigate with locale prop correctly', async () => {
     const browser = await webdriver(appPort, '/links?nextLocale=fr')
     await addDefaultLocaleCookie(browser)
+    await browser.eval('window.beforeNav = 1')
 
     expect(await browser.elementByCss('#router-pathname').text()).toBe('/links')
     expect(await browser.elementByCss('#router-as-path').text()).toBe(
@@ -208,7 +209,7 @@ function runTests(isDev) {
     expect(await browser.elementByCss('#router-as-path').text()).toBe(
       '/links?nextLocale=fr'
     )
-    expect(await browser.elementByCss('#router-locale').text()).toBe('fr')
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
     expect(
       JSON.parse(await browser.elementByCss('#router-locales').text())
     ).toEqual(locales)
@@ -217,7 +218,7 @@ function runTests(isDev) {
     ).toEqual({ nextLocale: 'fr' })
 
     parsedUrl = url.parse(await browser.eval('window.location.href'), true)
-    expect(parsedUrl.pathname).toBe('/fr/links')
+    expect(parsedUrl.pathname).toBe('/links')
     expect(parsedUrl.query).toEqual({ nextLocale: 'fr' })
 
     await browser.eval('window.history.forward()')
@@ -240,6 +241,7 @@ function runTests(isDev) {
     parsedUrl = url.parse(await browser.eval('window.location.href'), true)
     expect(parsedUrl.pathname).toBe('/fr/another')
     expect(parsedUrl.query).toEqual({})
+    expect(await browser.eval('window.beforeNav')).toBe(1)
   })
 
   it('should navigate with locale prop correctly GSP', async () => {
@@ -286,16 +288,182 @@ function runTests(isDev) {
     expect(await browser.elementByCss('#router-as-path').text()).toBe(
       '/links?nextLocale=nl'
     )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ nextLocale: 'nl' })
+
+    parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/links')
+    expect(parsedUrl.query).toEqual({ nextLocale: 'nl' })
+
+    await browser.eval('window.history.forward()')
+    await browser.waitForElementByCss('#gsp')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/gsp/fallback/[slug]'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/gsp/fallback/first'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('nl')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ slug: 'first' })
+
+    parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/nl/gsp/fallback/first')
+    expect(parsedUrl.query).toEqual({})
+  })
+
+  it('should navigate with locale false correctly', async () => {
+    const browser = await webdriver(appPort, '/locale-false?nextLocale=fr')
+    await addDefaultLocaleCookie(browser)
+    await browser.eval('window.beforeNav = 1')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/locale-false'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/locale-false?nextLocale=fr'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ nextLocale: 'fr' })
+
+    await browser.elementByCss('#to-another').click()
+    await browser.waitForElementByCss('#another')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/another'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/another'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('fr')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({})
+
+    let parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/fr/another')
+    expect(parsedUrl.query).toEqual({})
+
+    await browser.eval('window.history.back()')
+    await browser.waitForElementByCss('#links')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/locale-false'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/locale-false?nextLocale=fr'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ nextLocale: 'fr' })
+
+    parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/locale-false')
+    expect(parsedUrl.query).toEqual({ nextLocale: 'fr' })
+
+    await browser.eval('window.history.forward()')
+    await browser.waitForElementByCss('#another')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/another'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/another'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('fr')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({})
+
+    parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/fr/another')
+    expect(parsedUrl.query).toEqual({})
+    expect(await browser.eval('window.beforeNav')).toBe(1)
+  })
+
+  it('should navigate with locale false correctly GSP', async () => {
+    const browser = await webdriver(appPort, '/locale-false?nextLocale=nl')
+    await addDefaultLocaleCookie(browser)
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/locale-false'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/locale-false?nextLocale=nl'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ nextLocale: 'nl' })
+
+    await browser.elementByCss('#to-fallback-first').click()
+    await browser.waitForElementByCss('#gsp')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/gsp/fallback/[slug]'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/gsp/fallback/first'
+    )
     expect(await browser.elementByCss('#router-locale').text()).toBe('nl')
     expect(
       JSON.parse(await browser.elementByCss('#router-locales').text())
     ).toEqual(locales)
+    expect(
+      JSON.parse(await browser.elementByCss('#router-query').text())
+    ).toEqual({ slug: 'first' })
+
+    let parsedUrl = url.parse(await browser.eval('window.location.href'), true)
+    expect(parsedUrl.pathname).toBe('/nl/gsp/fallback/first')
+    expect(parsedUrl.query).toEqual({})
+
+    await browser.eval('window.history.back()')
+    await browser.waitForElementByCss('#links')
+
+    expect(await browser.elementByCss('#router-pathname').text()).toBe(
+      '/locale-false'
+    )
+    expect(await browser.elementByCss('#router-as-path').text()).toBe(
+      '/locale-false?nextLocale=nl'
+    )
+    expect(await browser.elementByCss('#router-locale').text()).toBe('en-US')
+    expect(
+      JSON.parse(await browser.elementByCss('#router-locales').text())
+    ).toEqual(locales)
     expect(
       JSON.parse(await browser.elementByCss('#router-query').text())
     ).toEqual({ nextLocale: 'nl' })
 
     parsedUrl = url.parse(await browser.eval('window.location.href'), true)
-    expect(parsedUrl.pathname).toBe('/nl/links')
+    expect(parsedUrl.pathname).toBe('/locale-false')
     expect(parsedUrl.query).toEqual({ nextLocale: 'nl' })
 
     await browser.eval('window.history.forward()')