fix[hardhat-ovm]: Allow for private key config option for signers (#946)

.changeset/tame-stingrays-retire.md

+---
+'@eth-optimism/hardhat-ovm': patch
+---
+
+Allow for private key config option for signers

packages/hardhat-ovm/src/index.ts

@@ -4,7 +4,10 @@ import * as path from 'path'
 import fetch from 'node-fetch'
 import { ethers } from 'ethers'
 import { subtask, extendEnvironment } from 'hardhat/config'
-import { HardhatNetworkHDAccountsConfig } from 'hardhat/types/config'
+import {
+  HardhatNetworkHDAccountsConfig,
+  HardhatNetworkAccountUserConfig,
+} from 'hardhat/types/config'
 import { getCompilersDir } from 'hardhat/internal/util/global-dir'
 import { Artifacts } from 'hardhat/internal/artifacts'
 import {
@@ -259,9 +262,17 @@ extendEnvironment(async (hre) => {
       // if the node is up, override the getSigners method's signers
       try {
         let signers: ethers.Signer[]
-        const accounts = hre.network.config
-          .accounts as HardhatNetworkHDAccountsConfig
-        if (accounts) {
+        const accounts = hre.network.config.accounts as
+          | HardhatNetworkHDAccountsConfig
+          | HardhatNetworkAccountUserConfig[]
+        if (Array.isArray(accounts)) {
+          signers = (accounts as HardhatNetworkAccountUserConfig[]).map(
+            (account) =>
+              new ethers.Wallet(
+                typeof account === 'string' ? account : account.privateKey
+              ).connect(provider)
+          )
+        } else if (accounts) {
           const indices = Array.from(Array(20).keys()) // generates array of [0, 1, 2, ..., 18, 19]
           signers = indices.map((i) =>
             ethers.Wallet.fromMnemonic(