move bnToRlp to types file so it can be exported in the main packag…

…e for use in monorepo

src/account.ts

@@ -5,8 +5,8 @@ import { stripHexPrefix } from 'ethjs-util'
 import { KECCAK256_RLP, KECCAK256_NULL } from './constants'
 import { zeros, bufferToHex, toBuffer } from './bytes'
 import { keccak, keccak256, keccakFromString, rlphash } from './hash'
-import { assertIsHexString, assertIsBuffer, bnToRlp } from './helpers'
-import { BNLike, BufferLike } from './types'
+import { assertIsHexString, assertIsBuffer } from './helpers'
+import { BNLike, BufferLike, bnToRlp } from './types'
 
 const {
   privateKeyVerify,

src/helpers.ts

@@ -1,6 +1,4 @@
-import * as BN from 'bn.js'
 import { isHexString } from 'ethjs-util'
-import { unpadBuffer } from './bytes'
 
 /**
  * Throws if a string is not hex prefixed
@@ -45,13 +43,3 @@ export const assertIsString = function(input: string): void {
     throw new Error(msg)
   }
 }
-
-/**
- * Convert value from BN to RLP (unpadded buffer)
- * @param value value to convert
- */
-export function bnToRlp(value: BN): Buffer {
-  // Using `bn.toArrayLike(Buffer)` instead of `bn.toBuffer()`
-  // for compatibility with browserify and similar tools
-  return unpadBuffer(value.toArrayLike(Buffer))
-}

src/types.ts

@@ -1,4 +1,5 @@
 import * as BN from 'bn.js'
+import { unpadBuffer } from './bytes'
 
 export type BNLike = BN | string | number
 
@@ -9,3 +10,13 @@ export type PrefixedHexString = string
 export interface TransformableToBuffer {
   toBuffer(): Buffer
 }
+
+/**
+ * Convert value from BN to RLP (unpadded buffer)
+ * @param value value to convert
+ */
+export function bnToRlp(value: BN): Buffer {
+  // Using `bn.toArrayLike(Buffer)` instead of `bn.toBuffer()`
+  // for compatibility with browserify and similar tools
+  return unpadBuffer(value.toArrayLike(Buffer))
+}