Fix: Improve crypto amount display precision

src/utils/amountFormatter.js

@@ -0,0 +1,60 @@
+/*
+ * Fix for USDT/CRYPTO amount display precision issues
+ * Addresses floating point precision errors in cryptocurrency amount displays
+ */
+
+// Fixed implementation to avoid floating point errors
+function formatCryptoAmount(amount, decimals = 18, symbol = 'USDT') {
+  // Handle both string and number inputs to prevent floating point issues
+  let amountBigInt;
+
+  if (typeof amount === 'string') {
+    // Ensure the string contains only numbers
+    amountBigInt = BigInt(amount.replace(/[^0-9]/g, '') || '0');
+  } else if (typeof amount === 'number') {
+    // Convert number to BigInt representation to avoid floating point errors
+    amountBigInt = BigInt(Math.round(amount * Math.pow(10, decimals)));
+  } else {
+    amountBigInt = BigInt(0);
+  }
+
+  // Calculate whole and fractional parts using BigInt to maintain precision
+  const divisor = BigInt(Math.pow(10, decimals));
+  const whole = amountBigInt / divisor;
+  const fraction = amountBigInt % divisor;
+
+  // Format fraction part without trailing zeros
+  let fractionStr = fraction.toString().padStart(decimals, '0');
+  // Remove trailing zeros but keep at least one digit if there's a fraction
+  fractionStr = fractionStr.replace(/0+$/, '');
+
+  const formattedAmount = fractionStr ? `${whole}.${fractionStr}` : whole.toString();
+
+  return {
+    amount: formattedAmount,
+    original: amount,
+    symbol: symbol,
+    formatted: `${formattedAmount} ${symbol}`
+  };
+}
+
+// Additional utility function for safe arithmetic operations
+function safeAdd(amount1, amount2, decimals = 18) {
+  const bigInt1 = typeof amount1 === 'string' ? BigInt(amount1) : BigInt(Math.round(Number(amount1) * Math.pow(10, decimals)));
+  const bigInt2 = typeof amount2 === 'string' ? BigInt(amount2) : BigInt(Math.round(Number(amount2) * Math.pow(10, decimals)));
+
+  return (bigInt1 + bigInt2).toString();
+}
+
+function safeMultiply(amount, multiplier, decimals = 18) {
+  const bigIntAmount = typeof amount === 'string' ? BigInt(amount) : BigInt(Math.round(Number(amount) * Math.pow(10, decimals)));
+  const result = (bigIntAmount * BigInt(Math.round(multiplier * Math.pow(10, decimals)))) / BigInt(Math.pow(10, decimals));
+
+  return result.toString();
+}
+
+module.exports = {
+  formatCryptoAmount,
+  safeAdd,
+  safeMultiply
+};