From 3888e5d640090fc96dbd54cd96650416ef39928a Mon Sep 17 00:00:00 2001
From: Cayman <caymannava@gmail.com>
Date: Sat, 7 Dec 2019 13:46:06 -0600
Subject: [PATCH 1/2] Add bigint support

---
 src/index.ts           | 6 +++---
 src/types.ts           | 2 +-
 test/dataTypes.spec.ts | 7 +++++++
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index 89a0124..32d2875 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -206,7 +206,7 @@ function stripHexPrefix(str: string): string {
 }
 
 /** Transform an integer into its hexadecimal value */
-function intToHex(integer: number): string {
+function intToHex(integer: number | bigint): string {
   if (integer < 0) {
     throw new Error('Invalid integer as argument, must be unsigned!')
   }
@@ -220,7 +220,7 @@ function padToEven(a: string): string {
 }
 
 /** Transform an integer into a Buffer */
-function intToBuffer(integer: number): Buffer {
+function intToBuffer(integer: number | bigint): Buffer {
   const hex = intToHex(integer)
   return Buffer.from(hex, 'hex')
 }
@@ -234,7 +234,7 @@ function toBuffer(v: Input): Buffer {
       } else {
         return Buffer.from(v)
       }
-    } else if (typeof v === 'number') {
+    } else if (typeof v === 'number' || typeof v === 'bigint') {
       if (!v) {
         return Buffer.from([])
       } else {
diff --git a/src/types.ts b/src/types.ts
index 70a8c9b..59cdabc 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1,6 +1,6 @@
 import BN = require('bn.js')
 
-export type Input = Buffer | string | number | Uint8Array | BN | List | null
+export type Input = Buffer | string | number | bigint | Uint8Array | BN | List | null
 
 // Use interface extension instead of type alias to
 // make circular declaration possible.
diff --git a/test/dataTypes.spec.ts b/test/dataTypes.spec.ts
index da210e8..2dfbdca 100644
--- a/test/dataTypes.spec.ts
+++ b/test/dataTypes.spec.ts
@@ -61,6 +61,13 @@ describe('RLP encoding (list):', function() {
   // })
 })
 
+describe('RLP encoding (BigInt):', function() {
+  it('should encode a BigInt value', function() {
+    const encodedBN = RLP.encode(BigInt(3))
+    assert.equal(encodedBN[0], 3)
+  })
+})
+
 describe('RLP encoding (BN):', function() {
   it('should encode a BN value', function() {
     const encodedBN = RLP.encode(new BN(3))

From d1138f973ff3ed0a3e82fe436e6e17f40fac0543 Mon Sep 17 00:00:00 2001
From: Cayman <caymannava@gmail.com>
Date: Mon, 6 Apr 2020 22:28:22 -0500
Subject: [PATCH 2/2] Skip bigint test on node < v10

---
 test/dataTypes.spec.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/dataTypes.spec.ts b/test/dataTypes.spec.ts
index 2dfbdca..d15003d 100644
--- a/test/dataTypes.spec.ts
+++ b/test/dataTypes.spec.ts
@@ -1,3 +1,4 @@
+import { version } from 'process'
 import * as assert from 'assert'
 import * as RLP from '../src'
 const BN = require('bn.js')
@@ -62,6 +63,13 @@ describe('RLP encoding (list):', function() {
 })
 
 describe('RLP encoding (BigInt):', function() {
+  before(function() {
+    const nodeVersionNumber = Number(version.match(/^v([0-9]+)/)![1])
+    if (nodeVersionNumber < 10) {
+      // tslint:disable-next-line no-invalid-this
+      this.skip()
+    }
+  })
   it('should encode a BigInt value', function() {
     const encodedBN = RLP.encode(BigInt(3))
     assert.equal(encodedBN[0], 3)