more docs, fixups

src/account.ts

@@ -109,6 +109,8 @@ export class Account {
 
   /**
    * Returns a `Boolean` determining if the account is empty.
+   * For more details about account emptiness see [EIP-161](https://eips.ethereum.org/EIPS/eip-161).
+   * Note: The stateRoot is also checked to be empty since in Frontier it was possible to create a contract with no code where nonce remained 0 but some values were written to storage in the constructor (thus stateRoot is not KECCAK256_RLP).
    */
   isEmpty(): boolean {
     return (
@@ -133,7 +135,7 @@ export const isValidAddress = function(hexAddress: string): boolean {
  *
  * If a eip1191ChainId is provided, the chainId will be included in the checksum calculation. This
  * has the effect of checksummed addresses for one chain having invalid checksums for others.
- * For more details, consult EIP-1191.
+ * For more details see [EIP-1191](https://eips.ethereum.org/EIPS/eip-1191).
  *
  * WARNING: Checksums with and without the chainId will differ. As of 2019-06-26, the most commonly
  * used variation in Ethereum was without the chainId. This may change in the future.
@@ -285,7 +287,7 @@ export const importPublic = function(publicKey: Buffer): Buffer {
 }
 
 /**
- * Returns a zero address.
+ * Returns the zero address.
  */
 export const zeroAddress = function(): string {
   const addressLength = 20
@@ -294,7 +296,7 @@ export const zeroAddress = function(): string {
 }
 
 /**
- * Checks if a given address is a zero address.
+ * Checks if a given address is the zero address.
  */
 export const isZeroAddress = function(hexAddress: string): boolean {
   assertIsHexString(hexAddress)

src/types.ts

@@ -1,12 +1,31 @@
 import * as BN from 'bn.js'
 import { unpadBuffer } from './bytes'
 
+/*
+ * A type that represents a BNLike input that can be converted to a BN.
+ */
 export type BNLike = BN | string | number
 
-export type BufferLike = Buffer | TransformableToBuffer | PrefixedHexString | number
+/*
+ * A type that represents a BufferLike input that can be converted to a Buffer.
+ */
+export type BufferLike =
+  | Buffer
+  | Uint8Array
+  | number[]
+  | number
+  | BN
+  | TransformableToBuffer
+  | PrefixedHexString
 
+/*
+ * A type that represents a `0x`-prefixed hex string.
+ */
 export type PrefixedHexString = string
 
+/*
+ * A type that represents an object that has a `toBuffer()` method.
+ */
 export interface TransformableToBuffer {
   toBuffer(): Buffer
 }