move clique constants to dedicated file

packages/block/src/clique.ts

@@ -0,0 +1,11 @@
+import { BN } from 'ethereumjs-util'
+
+// Fixed number of extra-data prefix bytes reserved for signer vanity
+export const CLIQUE_EXTRA_VANITY = 32
+// Fixed number of extra-data suffix bytes reserved for signer seal
+export const CLIQUE_EXTRA_SEAL = 65
+
+// Block difficulty for in-turn signatures
+export const CLIQUE_DIFF_INTURN = new BN(2)
+// Block difficulty for in-turn signatures
+export const CLIQUE_DIFF_NOTURN = new BN(1)

packages/block/src/header.ts

@@ -14,15 +14,15 @@ import {
   bufferToInt,
 } from 'ethereumjs-util'
 import { HeaderData, JsonHeader, BlockHeaderBuffer, Blockchain, BlockOptions } from './types'
+import {
+  CLIQUE_EXTRA_VANITY,
+  CLIQUE_EXTRA_SEAL,
+  CLIQUE_DIFF_INTURN,
+  CLIQUE_DIFF_NOTURN,
+} from './clique'
 
 const DEFAULT_GAS_LIMIT = new BN(Buffer.from('ffffffffffffff', 'hex'))
 
-const CLIQUE_EXTRA_VANITY = 32
-const CLIQUE_EXTRA_SEAL = 65
-
-const CLIQUE_DIFF_INTURN = new BN(2)
-const CLIQUE_DIFF_NOTURN = new BN(1)
-
 /**
  * An object that represents the block header.
  */
@@ -562,7 +562,10 @@ export class BlockHeader {
     }
   }
 
-  /* Hash for PoA clique blocks is created without the seal */
+  /**
+   * Hash for PoA clique blocks is created without the seal.
+   * @hidden
+   */
   private cliqueHash() {
     const raw = this.raw()
     raw[12] = this.extraData.slice(0, this.extraData.length - CLIQUE_EXTRA_SEAL)

packages/blockchain/src/clique.ts

@@ -1,13 +1,18 @@
 import { Address, BN } from 'ethereumjs-util'
 
-export type CliqueSignerState = [BN, Address[]] // [blockNumber, signers]
+// Clique Signer State: [blockNumber, signers]
+export type CliqueSignerState = [BN, Address[]]
 export type CliqueLatestSignerStates = CliqueSignerState[]
 
-export type CliqueVote = [BN, [Address, Address, Buffer]] // [blockNumber, [signer, beneficiary, cliqueNonce]]
+// Clique Vote: [blockNumber, [signer, beneficiary, cliqueNonce]]
+export type CliqueVote = [BN, [Address, Address, Buffer]]
 export type CliqueLatestVotes = CliqueVote[]
 
-export type CliqueBlockSigner = [BN, Address] // [blockNumber, signer]
+// Clique Block Signer: [blockNumber, signer]
+export type CliqueBlockSigner = [BN, Address]
 export type CliqueLatestBlockSigners = CliqueBlockSigner[]
 
+// Magic nonce number to vote on adding a new signer
 export const CLIQUE_NONCE_AUTH = Buffer.from('ffffffffffffffff', 'hex')
+// Magic nonce number to vote on removing a signer.
 export const CLIQUE_NONCE_DROP = Buffer.alloc(8)