From 8ca0b762ad71912778ae9dfd21bd71fd0f6b013a Mon Sep 17 00:00:00 2001
From: Daniel <80175477+dan437@users.noreply.github.com>
Date: Mon, 21 Aug 2023 18:06:12 +0200
Subject: [PATCH] Don't call "toPrecisionWithoutTrailingZeros" if a destination
 value is not a number (#20525)

---
 ui/pages/swaps/swaps.util.test.js |  6 ++++++
 ui/pages/swaps/swaps.util.ts      | 14 ++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/ui/pages/swaps/swaps.util.test.js b/ui/pages/swaps/swaps.util.test.js
index 05f06f7d1..642879484 100644
--- a/ui/pages/swaps/swaps.util.test.js
+++ b/ui/pages/swaps/swaps.util.test.js
@@ -401,6 +401,12 @@ describe('Swaps Util', () => {
         '39.6493201125',
       );
     });
+
+    it('gets swaps value for display when the value contains three dots', () => {
+      expect(formatSwapsValueForDisplay('33680099000000000000...')).toBe(
+        '33680099000000000000...',
+      );
+    });
   });
 
   describe('getSwapsTokensReceivedFromTxMeta', () => {
diff --git a/ui/pages/swaps/swaps.util.ts b/ui/pages/swaps/swaps.util.ts
index 566faa93f..7782f0df8 100644
--- a/ui/pages/swaps/swaps.util.ts
+++ b/ui/pages/swaps/swaps.util.ts
@@ -545,8 +545,18 @@ export function quotesToRenderableData({
   });
 }
 
-export function formatSwapsValueForDisplay(destinationAmount: string): string {
-  let amountToDisplay = toPrecisionWithoutTrailingZeros(destinationAmount, 12);
+export function formatSwapsValueForDisplay(
+  destinationAmount: string | BigNumber,
+): string {
+  let amountToDisplay;
+  if (
+    typeof destinationAmount === 'string' &&
+    destinationAmount.includes('...')
+  ) {
+    amountToDisplay = destinationAmount;
+  } else {
+    amountToDisplay = toPrecisionWithoutTrailingZeros(destinationAmount, 12);
+  }
   if (amountToDisplay.match(/e[+-]/u)) {
     amountToDisplay = new BigNumber(amountToDisplay).toFixed();
   }