From 82e98bbe06f85b720e84c9d44608336dd18b12c6 Mon Sep 17 00:00:00 2001
From: Loris Leiva <loris.leiva@gmail.com>
Date: Fri, 23 Jan 2026 09:01:11 +0000
Subject: [PATCH] Use SolanaError instance as CU simulation failure cause

---
 clients/js/src/estimateComputeLimitInternal.ts       | 3 ++-
 clients/js/test/estimateComputeLimitInternal.test.ts | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/clients/js/src/estimateComputeLimitInternal.ts b/clients/js/src/estimateComputeLimitInternal.ts
index 9b1c398..0b0e01c 100644
--- a/clients/js/src/estimateComputeLimitInternal.ts
+++ b/clients/js/src/estimateComputeLimitInternal.ts
@@ -3,6 +3,7 @@ import {
     Commitment,
     compileTransaction,
     getBase64EncodedWireTransaction,
+    getSolanaErrorFromTransactionError,
     isSolanaError,
     isTransactionMessageWithDurableNonceLifetime,
     pipe,
@@ -158,7 +159,7 @@ async function simulateTransactionAndGetConsumedUnits({
         const downcastUnitsConsumed = unitsConsumed > 4_294_967_295n ? 4_294_967_295 : Number(unitsConsumed);
         if (transactionError) {
             throw new SolanaError(SOLANA_ERROR__TRANSACTION__FAILED_WHEN_SIMULATING_TO_ESTIMATE_COMPUTE_LIMIT, {
-                cause: transactionError,
+                cause: getSolanaErrorFromTransactionError(transactionError),
                 unitsConsumed: downcastUnitsConsumed,
             });
         }
diff --git a/clients/js/test/estimateComputeLimitInternal.test.ts b/clients/js/test/estimateComputeLimitInternal.test.ts
index 886eaf6..62c8967 100644
--- a/clients/js/test/estimateComputeLimitInternal.test.ts
+++ b/clients/js/test/estimateComputeLimitInternal.test.ts
@@ -10,6 +10,7 @@ import {
     SOLANA_ERROR__INSTRUCTION_ERROR__INSUFFICIENT_FUNDS,
     SOLANA_ERROR__TRANSACTION__FAILED_TO_ESTIMATE_COMPUTE_LIMIT,
     SOLANA_ERROR__TRANSACTION__FAILED_WHEN_SIMULATING_TO_ESTIMATE_COMPUTE_LIMIT,
+    SOLANA_ERROR__TRANSACTION_ERROR__ACCOUNT_NOT_FOUND,
     SolanaError,
     TransactionError,
     TransactionMessageWithFeePayer,
@@ -235,7 +236,7 @@ describe('estimateComputeUnitLimit', () => {
         await expect(estimatePromise).resolves.toBe(1400000);
     });
 
-    it('throws with the transaction error as cause when the transaction fails in simulation', async () => {
+    it('throws with the transaction SolanaError as cause when the transaction fails in simulation', async () => {
         expect.assertions(1);
         const transactionError: TransactionError = 'AccountNotFound';
         sendSimulateTransactionRequest.mockResolvedValue({
@@ -249,7 +250,7 @@ describe('estimateComputeUnitLimit', () => {
 
         await expect(estimatePromise).rejects.toThrow(
             new SolanaError(SOLANA_ERROR__TRANSACTION__FAILED_WHEN_SIMULATING_TO_ESTIMATE_COMPUTE_LIMIT, {
-                cause: transactionError,
+                cause: new SolanaError(SOLANA_ERROR__TRANSACTION_ERROR__ACCOUNT_NOT_FOUND),
                 unitsConsumed: 42,
             }),
         );