VM: Add type definitions for logs (#1084)

* Add type definition for Log

Author: LogvinovLeon

packages/vm/lib/evm/eei.ts

@@ -6,6 +6,7 @@ import { StateManager } from '../state/index'
 import { VmError, ERROR } from '../exceptions'
 import Message from './message'
 import EVM, { EVMResult } from './evm'
+import { Log } from './types'
 
 function trap(err: ERROR) {
   throw new VmError(err)
@@ -41,7 +42,7 @@ export interface Env {
  * Immediate (unprocessed) result of running an EVM bytecode.
  */
 export interface RunResult {
-  logs: any // TODO: define type for Log (each log: [Buffer(address), [Buffer(topic0), ...]])
+  logs: Log[]
   returnValue?: Buffer
   /**
    * A map from the accounts that have self-destructed to the addresses to send their funds to
@@ -392,12 +393,7 @@ export default class EEI {
       trap(ERROR.INTERNAL_ERROR)
     }
 
-    // add address
-    const log: any = [this._env.address.buf]
-    log.push(topics)
-
-    // add data
-    log.push(data)
+    const log: Log = [this._env.address.buf, topics, data]
     this._result.logs.push(log)
   }
 

packages/vm/lib/evm/evm.ts

@@ -16,6 +16,7 @@ import TxContext from './txContext'
 import Message from './message'
 import EEI from './eei'
 import { short } from './opcodes/util'
+import { Log } from './types'
 import { default as Interpreter, InterpreterOpts, RunState } from './interpreter'
 
 const debug = createDebugLogger('vm:evm')
@@ -63,7 +64,7 @@ export interface ExecResult {
   /**
    * Array of logs that the contract emitted
    */
-  logs?: any[]
+  logs?: Log[]
   /**
    * A map from the accounts that have self-destructed to the addresses to send their funds to
    */

packages/vm/lib/evm/types.ts

@@ -0,0 +1,5 @@
+/**
+ * Log that the contract emitted.
+ * Format: [address, topics, data]
+ */
+export type Log = [Buffer, Buffer[], Buffer]

packages/vm/lib/runBlock.ts

@@ -8,6 +8,7 @@ import { RunTxResult } from './runTx'
 import { StateManager } from './state'
 
 import * as DAOConfig from './config/dao_fork_accounts_config.json'
+import { Log } from './evm/types'
 
 /* DAO account list */
 
@@ -79,7 +80,7 @@ interface TxReceipt {
   /**
    * Logs emitted
    */
-  logs: any[]
+  logs: Log[]
 }
 
 /**