React-native bigint64 deserialization problem - refactoring/bigint64le

package.json

@@ -28,6 +28,7 @@
   ],
   "license": "Apache-2.0",
   "devDependencies": {
+    "@types/big-integer": "^0.0.31",
     "@types/jest": "^26.0.23",
     "jest": "^27.3.1",
     "prettier": "^2.3.0",
@@ -39,6 +40,7 @@
   "dependencies": {
     "@solana/web3.js": "^1.30.2",
     "assert": "^2.0.0",
+    "big-integer": "^1.6.51",
     "buffer": "^6.0.1"
   }
 }

src/readBig.ts

@@ -1,4 +1,5 @@
 import { Buffer } from 'buffer'
+import BigInt from 'big-integer'
 
 // https://github.com/nodejs/node/blob/v14.17.0/lib/internal/errors.js#L758
 const ERR_BUFFER_OUT_OF_BOUNDS = () => new Error('Attempt to access memory outside buffer bounds')
@@ -36,10 +37,8 @@ export function readBigInt64LE(buffer: Buffer, offset = 0): bigint {
   if (first === undefined || last === undefined) boundsError(offset, buffer.length - 8)
   // tslint:disable-next-line:no-bitwise
   const val = buffer[offset + 4] + buffer[offset + 5] * 2 ** 8 + buffer[offset + 6] * 2 ** 16 + (last << 24) // Overflow
-  return (
-    (BigInt(val) << BigInt(32)) + // tslint:disable-line:no-bitwise
-    BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24)
-  )
+  const result = BigInt(val).shiftLeft(32).add(BigInt(first + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + buffer[++offset] * 2 ** 24))
+  return result;
 }
 
 // https://github.com/nodejs/node/blob/v14.17.0/lib/internal/buffer.js#L89-L107
@@ -53,5 +52,5 @@ export function readBigUInt64LE(buffer: Buffer, offset = 0): bigint {
 
   const hi = buffer[++offset] + buffer[++offset] * 2 ** 8 + buffer[++offset] * 2 ** 16 + last * 2 ** 24
 
-  return BigInt(lo) + (BigInt(hi) << BigInt(32)) // tslint:disable-line:no-bitwise
+  return BigInt(hi).shiftLeft(32).add(lo) // tslint:disable-line:no-bitwise
 }

tsconfig.json

@@ -4,6 +4,7 @@
     "module": "commonjs",
     "declaration": true,
     "outDir": "./lib",
+    "esModuleInterop": true,
     "strict": true
   },
   "include": ["src"],