chore: remove landing page flag (#5673)

src/components/FeatureFlagModal/FeatureFlagModal.tsx

 import { BaseVariant, FeatureFlag, featureFlagSettings, useUpdateFlag } from 'featureFlags'
-import { LandingPageVariant, useLandingPageFlag } from 'featureFlags/flags/landingPage'
 import { Permit2Variant, usePermit2Flag } from 'featureFlags/flags/permit2'
 import { TraceJsonRpcVariant, useTraceJsonRpcFlag } from 'featureFlags/flags/traceJsonRpc'
 import { useAtomValue, useUpdateAtom } from 'jotai/utils'
@@ -203,12 +202,6 @@ export default function FeatureFlagModal() {
           <X size={24} />
         </CloseButton>
       </Header>
-      <FeatureFlagOption
-        variant={LandingPageVariant}
-        value={useLandingPageFlag()}
-        featureFlag={FeatureFlag.landingPage}
-        label="Landing page"
-      />
       <FeatureFlagOption
         variant={Permit2Variant}
         value={usePermit2Flag()}

src/featureFlags/flags/featureFlags.ts

 export enum FeatureFlag {
   traceJsonRpc = 'traceJsonRpc',
-  landingPage = 'landingPage',
   permit2 = 'permit2',
 }

src/featureFlags/flags/landingPage.ts

-import { BaseVariant } from '../index'
-
-export function useLandingPageFlag(): BaseVariant {
-  return BaseVariant.Enabled
-}
-
-export { BaseVariant as LandingPageVariant }

src/pages/App.tsx

@@ -4,7 +4,6 @@ import Loader from 'components/Loader'
 import { MenuDropdown } from 'components/NavBar/MenuDropdown'
 import TopLevelModals from 'components/TopLevelModals'
 import { useFeatureFlagsIsLoaded } from 'featureFlags'
-import { LandingPageVariant, useLandingPageFlag } from 'featureFlags/flags/landingPage'
 import ApeModeQueryParamReader from 'hooks/useApeModeQueryParamReader'
 import { Box } from 'nft/components/Box'
 import { CollectionPageSkeleton } from 'nft/components/collection/CollectionPageSkeleton'
@@ -202,8 +201,6 @@ export default function App() {
 
   const isHeaderTransparent = !scrolledState
 
-  const landingPageFlag = useLandingPageFlag()
-
   return (
     <ErrorBoundary>
       <DarkModeQueryParamReader />
@@ -220,7 +217,7 @@ export default function App() {
             <Suspense fallback={<Loader />}>
               {isLoaded ? (
                 <Routes>
-                  {landingPageFlag === LandingPageVariant.Enabled && <Route path="/" element={<Landing />} />}
+                  <Route path="/" element={<Landing />} />
                   <Route path="tokens" element={<Tokens />}>
                     <Route path=":chainName" />
                   </Route>

src/pages/Landing/index.tsx

 import { Trace, TraceEvent } from '@uniswap/analytics'
 import { BrowserEvent, ElementName, EventName, PageName } from '@uniswap/analytics-events'
 import { BaseButton } from 'components/Button'
-import { LandingPageVariant, useLandingPageFlag } from 'featureFlags/flags/landingPage'
 import Swap from 'pages/Swap'
 import { useEffect } from 'react'
 import { useLocation } from 'react-router-dom'
@@ -170,21 +169,14 @@ export default function Landing() {
   const location = useLocation()
   const isOpen = location.pathname === '/'
 
-  const landingPageFlag = useLandingPageFlag()
-
   useEffect(() => {
-    if (landingPageFlag) {
-      document.body.style.overflow = 'hidden'
-      return () => {
-        document.body.style.overflow = 'auto'
-      }
-    }
+    document.body.style.overflow = 'hidden'
     return () => {
-      // need to have a return so the hook doesn't throw.
+      document.body.style.overflow = 'auto'
     }
-  }, [landingPageFlag])
+  }, [])
 
-  if (landingPageFlag === LandingPageVariant.Control || !isOpen) return null
+  if (!isOpen) return null
 
   return (
     <Trace page={PageName.LANDING_PAGE} shouldLogImpression>