fix: account for bnb txs that do not...

transfer tokens to taker, but instead to exchange proxy
which then transfers token to taker

src/parsers/index.ts

@@ -447,6 +447,10 @@ export async function sellToPancakeSwap({
     outputLog = logs.find((log) => log.from !== exchangeProxy);
   }
 
+  if (!logs.some((log) => log.to === from)) {
+    outputLog = logs.find((log) => log.to === exchangeProxy);
+  }
+
   if (inputLog && outputLog) {
     return extractTokenInfo(inputLog, outputLog);
   }

src/tests/index.test.ts

@@ -1,7 +1,7 @@
 import { it, expect } from "vitest";
 import { parseSwap } from "../index";
 import { EXCHANGE_PROXY_ABI_URL } from "../constants";
-import { exchangeProxyAbi } from "../abi/ExchangeProxyAbi"
+import { exchangeProxyAbi } from "../abi/ExchangeProxyAbi";
 
 require("dotenv").config();
 
@@ -66,7 +66,7 @@ it("throws an error if the chainId is not supported", () => {
       exchangeProxyAbi,
       rpcUrl: "https://rpc.gnosis.gateway.fm",
       transactionHash:
-        "0x689eaa9ad3db373b241330be646e450d5b8bb3faad7f0c3260c63b9ef6765fcb",
+        "0x2cd8904d385dbf4347c28062d8c20d1307202ee5e1d3aacf4b3fc067ca783a29",
     });
   }).rejects.toThrowError("chainId 100 is unsupported…");
 });

src/tests/sellToPancakeSwap.test.ts

@@ -73,4 +73,27 @@ describe("sellToPancakeSwap", () => {
       });
     });
   });
+
+  // https://bscscan.com/tx/0xba7e86dd27ba9b14cca0c98edc5df9c753ec8ae27ace3bacb80e87cbde33f850
+  it("parses swap from sellToPancakeSwap with transfer events that transfer output amount to exchange proxy", async () => {
+    const data = await parseSwap({
+      exchangeProxyAbi,
+      rpcUrl: BSC_RPC,
+      transactionHash:
+        "0xba7e86dd27ba9b14cca0c98edc5df9c753ec8ae27ace3bacb80e87cbde33f850",
+    });
+
+    expect(data).toEqual({
+      tokenIn: {
+        symbol: "IDIA",
+        amount: "50",
+        address: "0x0b15Ddf19D47E6a86A56148fb4aFFFc6929BcB89",
+      },
+      tokenOut: {
+        symbol: "WBNB",
+        amount: "0.011285266969864419",
+        address: "0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c",
+      },
+    });
+  });
 });