From f6a825c79a0f47efcf85209a2ba8c4673caa9b36 Mon Sep 17 00:00:00 2001
From: hzhu <hz@henryzhu.me>
Date: Tue, 30 Jul 2024 22:48:57 -0700
Subject: [PATCH] fix: parse latest executeMetaTxn from base

---
 src/index.ts            |  6 ++++++
 src/tests/index.test.ts | 31 +++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index b3f00e7..3a1925f 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -173,6 +173,12 @@ export async function parseSwap({
     };
   }
 
+  if (!output && input.from) {
+    output = logs.find(
+      (log) => log.to.toLowerCase() === input.from.toLowerCase()
+    );
+  }
+
   /* v8 ignore start */
   if (!output) {
     console.error(
diff --git a/src/tests/index.test.ts b/src/tests/index.test.ts
index 6305417..2f12068 100644
--- a/src/tests/index.test.ts
+++ b/src/tests/index.test.ts
@@ -259,6 +259,37 @@ test("throws an error for unsupported chains)", async () => {
   }).rejects.toThrowError("chainId 42220 is unsupported…");
 });
 
+// https://basescan.org/tx/0x314ea35ef3120934ee4714f4815dc3b08dc2ab0e32e0662bfba3cdbcff14d79b
+test("parse a gasless swap on Base (DAI for USDC)", async () => {
+  const publicClient = createPublicClient({
+    chain: base,
+    transport: http(
+      `https://base-mainnet.g.alchemy.com/v2/${process.env.ALCHEMY_API_KEY}`
+    ),
+  }) as PublicClient<Transport, Chain>;
+
+  const transactionHash =
+    "0x314ea35ef3120934ee4714f4815dc3b08dc2ab0e32e0662bfba3cdbcff14d79b";
+
+  const result = await parseSwap({
+    publicClient,
+    transactionHash,
+  });
+
+  expect(result).toEqual({
+    tokenIn: {
+      symbol: "DAI",
+      amount: "1.998484821908329022",
+      address: "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb",
+    },
+    tokenOut: {
+      symbol: "USDC",
+      amount: "1.982641",
+      address: "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
+    },
+  });
+});
+
 // https://basescan.org/tx/0xa09cb1606e30c3aed8a842723fd6c23cecd838a59f750ab3dbc5ef2c7486e696
 test("parse a swap on Base (USDC for DAI)", async () => {
   const publicClient = createPublicClient({