chore: remove unused feature flags (#6484)

src/components/FeatureFlagModal/FeatureFlagModal.tsx

 import { BaseVariant, FeatureFlag, featureFlagSettings, useUpdateFlag } from 'featureFlags'
 import { DetailsV2Variant, useDetailsV2Flag } from 'featureFlags/flags/nftDetails'
 import { useWidgetRemovalFlag, WidgetRemovalVariant } from 'featureFlags/flags/removeWidgetTdp'
-import { SwapWidgetVariant, useSwapWidgetFlag } from 'featureFlags/flags/swapWidget'
 import { TraceJsonRpcVariant, useTraceJsonRpcFlag } from 'featureFlags/flags/traceJsonRpc'
 import { useUpdateAtom } from 'jotai/utils'
 import { Children, PropsWithChildren, ReactElement, ReactNode, useCallback, useState } from 'react'
@@ -203,12 +202,6 @@ export default function FeatureFlagModal() {
           <X size={24} />
         </CloseButton>
       </Header>
-      <FeatureFlagOption
-        variant={SwapWidgetVariant}
-        value={useSwapWidgetFlag()}
-        featureFlag={FeatureFlag.swapWidget}
-        label="Swap Widget"
-      />
       <FeatureFlagOption
         variant={DetailsV2Variant}
         value={useDetailsV2Flag()}

src/components/Tokens/TokenDetails/MobileBalanceSummaryFooter.tsx

@@ -3,7 +3,6 @@ import { formatCurrencyAmount, NumberType } from '@uniswap/conedison/format'
 import { Currency } from '@uniswap/sdk-core'
 import { useWeb3React } from '@web3-react/core'
 import { NATIVE_CHAIN_ID } from 'constants/tokens'
-import { useDummyGateEnabled } from 'featureFlags/flags/dummyFeatureGate'
 import { CHAIN_ID_TO_BACKEND_NAME } from 'graphql/data/util'
 import { useStablecoinValue } from 'hooks/useStablecoinPrice'
 import useCurrencyBalance from 'lib/hooks/useCurrencyBalance'
@@ -88,7 +87,6 @@ export default function MobileBalanceSummaryFooter({ token }: { token: Currency
   const formattedBalance = formatCurrencyAmount(balance, NumberType.TokenNonTx)
   const formattedUsdValue = formatCurrencyAmount(useStablecoinValue(balance), NumberType.FiatTokenStats)
   const chain = CHAIN_ID_TO_BACKEND_NAME[token.chainId].toLowerCase()
-  const isDummyGateFlagEnabled = useDummyGateEnabled()
 
   return (
     <Wrapper>
@@ -104,7 +102,7 @@ export default function MobileBalanceSummaryFooter({ token }: { token: Currency
         </BalanceInfo>
       )}
       <SwapButton to={`/swap?chainName=${chain}&outputCurrency=${token.isNative ? NATIVE_CHAIN_ID : token.address}`}>
-        <Trans>{isDummyGateFlagEnabled ? 'Go to Swap' : 'Swap'}</Trans>
+        <Trans>Swap</Trans>
       </SwapButton>
     </Wrapper>
   )

src/featureFlags/flags/dummyFeatureGate.ts

-import { BaseVariant, FeatureFlag, useBaseFlag } from '../index'
-
-function useDummyGateFlag(): BaseVariant {
-  return useBaseFlag(FeatureFlag.statsigDummy)
-}
-
-export function useDummyGateEnabled(): boolean {
-  return useDummyGateFlag() === BaseVariant.Enabled
-}

src/featureFlags/flags/featureFlags.ts

@@ -5,8 +5,6 @@ export enum FeatureFlag {
   traceJsonRpc = 'traceJsonRpc',
   permit2 = 'permit2',
   fiatOnRampButtonOnSwap = 'fiat_on_ramp_button_on_swap_page',
-  swapWidget = 'swap_widget_replacement_enabled',
-  statsigDummy = 'web_dummy_gate_amplitude_id',
   detailsV2 = 'details_v2',
   removeWidget = 'remove_widget_tdp',
 }

src/featureFlags/flags/swapWidget.ts

-import { BaseVariant, FeatureFlag, useBaseFlag } from '../index'
-
-export function useSwapWidgetFlag(): BaseVariant {
-  return useBaseFlag(FeatureFlag.swapWidget, BaseVariant.Control)
-}
-
-export function useSwapWidgetEnabled(): boolean {
-  return useSwapWidgetFlag() === BaseVariant.Enabled
-}
-
-export { BaseVariant as SwapWidgetVariant }

src/pages/Landing/index.tsx

@@ -6,7 +6,6 @@ import Card, { CardType } from 'components/About/Card'
 import { MAIN_CARDS, MORE_CARDS } from 'components/About/constants'
 import ProtocolBanner from 'components/About/ProtocolBanner'
 import { BaseButton } from 'components/Button'
-import { useSwapWidgetEnabled } from 'featureFlags/flags/swapWidget'
 import { useAtomValue } from 'jotai/utils'
 import Swap from 'pages/Swap'
 import { parse } from 'qs'
@@ -289,11 +288,6 @@ const Link = styled(NativeLink)`
   ${LinkCss}
 `
 
-const WidgetLandingLink = styled(NativeLink)`
-  ${LinkCss}
-  ${SwapCss}
-`
-
 export default function Landing() {
   const isDarkMode = useIsDarkMode()
 
@@ -307,8 +301,6 @@ export default function Landing() {
     ignoreQueryPrefix: true,
   })
 
-  const swapWidgetEnabled = useSwapWidgetEnabled()
-
   // This can be simplified significantly once the flag is removed! For now being explicit is clearer.
   useEffect(() => {
     if (queryParams.intro || !selectedWallet) {
@@ -330,15 +322,9 @@ export default function Landing() {
               name={SharedEventName.ELEMENT_CLICKED}
               element={InterfaceElementName.LANDING_PAGE_SWAP_ELEMENT}
             >
-              {swapWidgetEnabled ? (
-                <WidgetLandingLink to="/swap">
-                  <Swap />
-                </WidgetLandingLink>
-              ) : (
               <Link to="/swap">
                 <LandingSwap />
               </Link>
-              )}
             </TraceEvent>
           </LandingSwapContainer>
           <Gradient isDarkMode={isDarkMode} />