allow eth_estimateGas to have optional to

Author: ryanio

packages/client/lib/rpc/modules/eth.ts

@@ -11,7 +11,7 @@ import {
 import { decode } from 'rlp'
 import { middleware, validators } from '../validation'
 import { INVALID_PARAMS } from '../error-code'
-import { RpcCallTx } from '../types'
+import { RpcTx } from '../types'
 import type { Chain } from '../../blockchain'
 import type { EthereumClient } from '../..'
 import type { EthereumService } from '../../service'
@@ -47,7 +47,7 @@ export class Eth {
     ])
 
     this.estimateGas = middleware(this.estimateGas.bind(this), 2, [
-      [validators.transaction(['to'])],
+      [validators.transaction()],
       [validators.blockOption],
     ])
 
@@ -114,7 +114,7 @@ export class Eth {
    *   2. integer block number, or the string "latest", "earliest" or "pending"
    * @returns The return value of the executed contract.
    */
-  async call(params: [RpcCallTx, string]) {
+  async call(params: [RpcTx, string]) {
     const [transaction, blockOpt] = params
 
     if (!this._vm) {
@@ -172,7 +172,7 @@ export class Eth {
    *   2. integer block number, or the string "latest", "earliest" or "pending"
    * @returns The amount of gas used.
    */
-  async estimateGas(params: [RpcCallTx, string]) {
+  async estimateGas(params: [RpcTx, string]) {
     const [transaction, blockOpt] = params
 
     if (!this._vm) {

packages/client/lib/rpc/types.ts

@@ -1,6 +1,6 @@
-export interface RpcCallTx {
+export interface RpcTx {
   from?: string
-  to: string
+  to?: string
   gas?: string
   gasPrice?: string
   value?: string

packages/client/lib/rpc/validation.ts

@@ -160,11 +160,13 @@ export const validators = {
   },
 
   /**
-   * validator to ensure required transaction fields are present and checks for valid address and hex values.
-   * @param params parameters of method
-   * @param index index of parameter
+   * validator to ensure required transaction fields are present, and checks for valid address and hex values.
+   * @param requiredFields array of required fields
+   * @returns validator function with params:
+   *   - @param params parameters of method
+   *   - @param index index of parameter
    */
-  transaction(requiredFields: string[]) {
+  transaction(requiredFields: string[] = []) {
     return (params: any[], index: number) => {
       if (typeof params[index] !== 'object') {
         return {