fix: use NativeCurrency for polygon matic (#7567)

* fix: use NativeCurrency for polygon matic

* add comment

* update snapshots??

* Revert "update snapshots??"

This reverts commit 280758be118610cc9e13afcd6e420985e8a200d2.

src/constants/tokens.ts

@@ -90,7 +90,13 @@ export const MATIC_MAINNET = new Token(
   'MATIC',
   'Polygon Matic'
 )
-const MATIC_POLYGON = new Token(ChainId.POLYGON, '0x0000000000000000000000000000000000001010', 18, 'MATIC', 'Matic')
+export const MATIC_POLYGON = new Token(
+  ChainId.POLYGON,
+  '0x0000000000000000000000000000000000001010',
+  18,
+  'MATIC',
+  'Matic'
+)
 export const DAI_POLYGON = new Token(
   ChainId.POLYGON,
   '0x8f3Cf7ad23Cd3CaDbD9735AFf958023239c6A063',
@@ -143,13 +149,6 @@ export const WBTC_OPTIMISM = new Token(
   'WBTC',
   'Wrapped BTC'
 )
-const MATIC_POLYGON_MUMBAI = new Token(
-  ChainId.POLYGON_MUMBAI,
-  '0x0000000000000000000000000000000000001010',
-  18,
-  'MATIC',
-  'Matic'
-)
 export const WETH_POLYGON_MUMBAI = new Token(
   ChainId.POLYGON_MUMBAI,
   '0xa6fa4fb5f76172d178d61b04b0ecd319c5d1c0aa',
@@ -359,14 +358,21 @@ export function isPolygon(chainId: number): chainId is ChainId.POLYGON | ChainId
   return chainId === ChainId.POLYGON_MUMBAI || chainId === ChainId.POLYGON
 }
 
-function getPolygonNativeCurrency(chainId: number) {
-  switch (chainId) {
-    case ChainId.POLYGON:
-      return MATIC_POLYGON
-    case ChainId.POLYGON_MUMBAI:
-      return MATIC_POLYGON_MUMBAI
-    default:
-      throw new Error('Not polygon')
+class PolygonNativeCurrency extends NativeCurrency {
+  equals(other: Currency): boolean {
+    return other.isNative && other.chainId === this.chainId
+  }
+
+  get wrapped(): Token {
+    if (!isPolygon(this.chainId)) throw new Error('Not Polygon')
+    const wrapped = WRAPPED_NATIVE_CURRENCY[this.chainId]
+    invariant(wrapped instanceof Token)
+    return wrapped
+  }
+
+  public constructor(chainId: number) {
+    if (!isPolygon(chainId)) throw new Error('Not Polygon')
+    super(chainId, 18, 'MATIC', 'Matic')
   }
 }
 
@@ -433,7 +439,7 @@ export function nativeOnChain(chainId: number): NativeCurrency | Token {
   if (cachedNativeCurrency[chainId]) return cachedNativeCurrency[chainId]
   let nativeCurrency: NativeCurrency | Token
   if (isPolygon(chainId)) {
-    nativeCurrency = getPolygonNativeCurrency(chainId)
+    nativeCurrency = new PolygonNativeCurrency(chainId)
   } else if (isCelo(chainId)) {
     nativeCurrency = getCeloNativeCurrency(chainId)
   } else if (isBsc(chainId)) {

src/utils/nativeTokens.ts

-import { nativeOnChain } from 'constants/tokens'
+import { MATIC_POLYGON, nativeOnChain } from 'constants/tokens'
 import { Chain } from 'graphql/data/__generated__/types-and-hooks'
 import { supportedChainIdFromGQLChain } from 'graphql/data/util'
 
@@ -10,8 +10,11 @@ export function getNativeTokenDBAddress(chain: Chain): string | undefined {
   switch (chain) {
     // Celo & Polygon have precompiles for their native tokens
     case Chain.Celo:
-    case Chain.Polygon:
       return nativeOnChain(pageChainId).wrapped.address
+    case Chain.Polygon:
+      // Like Celo, native MATIC does have a ERC20 precompile, but we use WMATIC in routing/pools
+      // So instead of returning nativeOnChain().wrapped.address, should directly use the precompile address here
+      return MATIC_POLYGON.address
     case Chain.Ethereum:
     case Chain.Arbitrum:
     case Chain.EthereumGoerli: