NomicFoundation · schaable · Feb 4, 2025 · Feb 4, 2025 · Feb 6, 2025 · Feb 6, 2025
diff --git a/docs/src/content/hardhat-network/docs/reference/index.md b/docs/src/content/hardhat-network/docs/reference/index.md
@@ -14,6 +14,7 @@
 - merge
 - shanghai
 - cancun
+- prague
 
 ## Config
 
@@ -66,7 +67,7 @@ The block gas limit to use in Hardhat Network's blockchain. Default value: `30_0
 
 #### `hardfork`
 
-This setting changes how Hardhat Network works, to mimic Ethereum's mainnet at a given hardfork. It must be one of `"byzantium"`, `"constantinople"`, `"petersburg"`, `"istanbul"`, `"muirGlacier"`, `"berlin"`, `"london"`, `"arrowGlacier"`, `"grayGlacier"`, `"merge"`, `"shanghai"` and `"cancun"`. Default value: `"cancun"`
+This setting changes how Hardhat Network works, to mimic Ethereum's mainnet at a given hardfork. It must be one of `"byzantium"`, `"constantinople"`, `"petersburg"`, `"istanbul"`, `"muirGlacier"`, `"berlin"`, `"london"`, `"arrowGlacier"`, `"grayGlacier"`, `"merge"`, `"shanghai"`, `"cancun"` and `"prague"`. Default value: `"prague"`
 
 #### `throwOnTransactionFailures`
 

diff --git a/packages/hardhat-core/package.json b/packages/hardhat-core/package.json
@@ -59,7 +59,6 @@
   "devDependencies": {
     "@nomicfoundation/eslint-plugin-hardhat-internal-rules": "workspace:^",
     "@nomicfoundation/eslint-plugin-slow-imports": "workspace:^",
-    "@nomicfoundation/ethereumjs-block": "5.0.4",
     "@types/async-eventemitter": "^0.2.1",
     "@types/bn.js": "^5.1.0",
     "@types/chai": "^4.2.0",
@@ -98,12 +97,12 @@
     "typescript": "~5.0.0"
   },
   "dependencies": {
+    "@ethereumjs/common": "^4.4.0",
+    "@ethereumjs/tx": "^5.4.0",
+    "@ethereumjs/util": "^9.1.0",
     "@ethersproject/abi": "^5.1.2",
     "@metamask/eth-sig-util": "^4.0.0",
     "@nomicfoundation/edr": "^0.8.0",
-    "@nomicfoundation/ethereumjs-common": "4.0.4",
-    "@nomicfoundation/ethereumjs-tx": "5.0.4",
-    "@nomicfoundation/ethereumjs-util": "9.0.4",
     "@nomicfoundation/solidity-analyzer": "^0.1.0",
     "@sentry/node": "^5.18.1",
     "@types/bn.js": "^5.1.0",
@@ -118,7 +117,6 @@
     "enquirer": "^2.3.0",
     "env-paths": "^2.2.0",
     "ethereum-cryptography": "^1.0.3",
-    "ethereumjs-abi": "^0.6.8",
     "find-up": "^5.0.0",
     "fp-ts": "1.19.3",
     "fs-extra": "^7.0.1",

diff --git a/packages/hardhat-core/src/builtin-tasks/node.ts b/packages/hardhat-core/src/builtin-tasks/node.ts
@@ -1,4 +1,4 @@
-import type EthereumjsUtilT from "@nomicfoundation/ethereumjs-util";
+import type EthereumjsUtilT from "@ethereumjs/util";
 
 import picocolors from "picocolors";
 import debug from "debug";
@@ -56,7 +56,7 @@ function logHardhatNetworkAccounts(networkConfig: HardhatNetworkConfig) {
     privateToAddress,
     toBytes,
     toChecksumAddress,
-  } = require("@nomicfoundation/ethereumjs-util") as typeof EthereumjsUtilT;
+  } = require("@ethereumjs/util") as typeof EthereumjsUtilT;
 
   console.log("Accounts");
   console.log("========");

diff --git a/packages/hardhat-core/src/internal/constants.ts b/packages/hardhat-core/src/internal/constants.ts
@@ -23,6 +23,7 @@ export const HARDHAT_NETWORK_SUPPORTED_HARDFORKS = [
   "merge",
   "shanghai",
   "cancun",
+  "prague",
 ];
 
 export const HARDHAT_MEMPOOL_SUPPORTED_ORDERS = ["fifo", "priority"] as const;

diff --git a/packages/hardhat-core/src/internal/core/config/config-resolution.ts b/packages/hardhat-core/src/internal/core/config/config-resolution.ts
@@ -238,19 +238,6 @@ function resolveHardhatNetworkConfig(
     delete config.initialBaseFeePerGas;
   }
 
-  if (
-    hardhatNetworkConfig.enableTransientStorage === true &&
-    hardhatNetworkConfig.hardfork === undefined
-  ) {
-    config.hardfork = "cancun";
-  }
-  if (
-    hardhatNetworkConfig.enableTransientStorage === false &&
-    hardhatNetworkConfig.hardfork === undefined
-  ) {
-    config.hardfork = "shanghai";
-  }
-
   return config;
 }
 

diff --git a/packages/hardhat-core/src/internal/core/config/default-config.ts b/packages/hardhat-core/src/internal/core/config/default-config.ts
@@ -36,7 +36,7 @@ export const defaultHardhatNetworkParams: Omit<
   HardhatNetworkConfig,
   "gas" | "initialDate"
 > = {
-  hardfork: HardforkName.CANCUN,
+  hardfork: HardforkName.PRAGUE,
   blockGasLimit: 30_000_000,
   gasPrice: HARDHAT_NETWORK_DEFAULT_GAS_PRICE,
   chainId: 31337,
@@ -56,7 +56,7 @@ export const defaultHardhatNetworkParams: Omit<
   minGasPrice: 0n,
   chains: new Map([
     [
-      // block numbers below were taken from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/common/src/chains
+      // block numbers below were taken from https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/common/src/chains.ts
       1, // mainnet
       {
         hardforkHistory: new Map([
@@ -77,6 +77,7 @@ export const defaultHardhatNetworkParams: Omit<
           [HardforkName.MERGE, 15_537_394],
           [HardforkName.SHANGHAI, 17_034_870],
           [HardforkName.CANCUN, 19_426_589],
+          [HardforkName.PRAGUE, 30_000_000], // TODO: replace with actual block number
         ]),
       },
     ],
@@ -138,6 +139,7 @@ export const defaultHardhatNetworkParams: Omit<
           [HardforkName.MERGE, 1_450_409],
           [HardforkName.SHANGHAI, 2_990_908],
           [HardforkName.CANCUN, 5_187_023],
+          [HardforkName.PRAGUE, 30_000_000], // TODO: replace with actual block number
         ]),
       },
     ],

diff --git a/packages/hardhat-core/src/internal/core/jsonrpc/types/authorization-list.ts b/packages/hardhat-core/src/internal/core/jsonrpc/types/authorization-list.ts
@@ -0,0 +1,20 @@
+import * as t from "io-ts";
+
+import { rpcAddress, rpcQuantity, rpcHash, rpcParity } from "./base-types";
+
+const rpcAuthorizationListTuple = t.type({
+  chainId: rpcQuantity,
+  address: rpcAddress,
+  nonce: rpcQuantity,
+  yParity: rpcParity,
+  r: rpcHash,
+  s: rpcHash,
+});
+
+export const rpcAuthorizationList = t.array(rpcAuthorizationListTuple);
+
+export type RpcAuthorizationListTuple = t.TypeOf<
+  typeof rpcAuthorizationListTuple
+>;
+
+export type RpcAuthorizationList = t.TypeOf<typeof rpcAuthorizationList>;
diff --git a/packages/hardhat-core/src/internal/core/jsonrpc/types/base-types.ts b/packages/hardhat-core/src/internal/core/jsonrpc/types/base-types.ts
@@ -2,7 +2,7 @@ import {
   bytesToHex as bufferToHex,
   isValidAddress,
   toBytes,
-} from "@nomicfoundation/ethereumjs-util";
+} from "@ethereumjs/util";
 import * as t from "io-ts";
 
 import * as BigIntUtils from "../../../util/bigint";
@@ -27,6 +27,14 @@ export const rpcData = new t.Type<Buffer>(
   t.identity
 );
 
+export const rpcParity = new t.Type<Buffer>(
+  "PARITY",
+  Buffer.isBuffer,
+  (u, c) =>
+    isRpcParityString(u) ? t.success(Buffer.from(toBytes(u))) : t.failure(u, c),
+  t.identity
+);
+
 export const rpcHash = new t.Type<Buffer>(
   "HASH",
   (v): v is Buffer => Buffer.isBuffer(v) && v.length === HASH_LENGTH_BYTES,
@@ -216,6 +224,10 @@ function isRpcDataString(u: unknown): u is string {
   return typeof u === "string" && u.match(/^0x(?:[0-9a-fA-F]{2})*$/) !== null;
 }
 
+function isRpcParityString(u: unknown): u is string {
+  return typeof u === "string" && u.match(/^0x[0-9a-fA-F]{1,2}$/) !== null;
+}
+
 function isRpcHashString(u: unknown): u is string {
   return typeof u === "string" && u.length === 66 && isRpcDataString(u);
 }

diff --git a/packages/hardhat-core/src/internal/core/jsonrpc/types/input/transactionRequest.ts b/packages/hardhat-core/src/internal/core/jsonrpc/types/input/transactionRequest.ts
@@ -3,6 +3,7 @@ import * as t from "io-ts";
 import { optionalOrNullable } from "../../../../util/io-ts";
 import { rpcAccessList } from "../access-list";
 import { rpcAddress, rpcData, rpcHash, rpcQuantity } from "../base-types";
+import { rpcAuthorizationList } from "../authorization-list";
 
 // Type used by eth_sendTransaction
 export const rpcTransactionRequest = t.type(
@@ -20,6 +21,7 @@ export const rpcTransactionRequest = t.type(
     maxPriorityFeePerGas: optionalOrNullable(rpcQuantity),
     blobs: optionalOrNullable(t.array(rpcData)),
     blobVersionedHashes: optionalOrNullable(t.array(rpcHash)),
+    authorizationList: optionalOrNullable(rpcAuthorizationList),
   },
   "RpcTransactionRequest"
 );
@@ -42,6 +44,14 @@ export interface RpcTransactionRequestInput {
   maxPriorityFeePerGas?: string;
   blobs?: string[];
   blobVersionedHashes?: string[];
+  authorizationList?: Array<{
+    chainId: string;
+    address: string;
+    nonce: string;
+    yParity: string;
+    r: string;
+    s: string;
+  }>;
 }
 
 export type RpcTransactionRequest = t.TypeOf<typeof rpcTransactionRequest>;
diff --git a/packages/hardhat-core/src/internal/core/providers/accounts.ts b/packages/hardhat-core/src/internal/core/providers/accounts.ts
@@ -1,7 +1,7 @@
 import * as t from "io-ts";
 
 import { signTypedData, SignTypedDataVersion } from "@metamask/eth-sig-util";
-import { FeeMarketEIP1559Transaction } from "@nomicfoundation/ethereumjs-tx";
+import { FeeMarketEIP1559Transaction } from "@ethereumjs/tx";
 import { EIP1193Provider, RequestArguments } from "../../../types";
 import { HardhatError } from "../errors";
 import { ERRORS } from "../errors-list";
@@ -49,7 +49,7 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
       toRpcSig,
       toBytes,
       bytesToHex: bufferToHex,
-    } = await import("@nomicfoundation/ethereumjs-util");
+    } = await import("@ethereumjs/util");
 
     if (
       args.method === "eth_accounts" ||
@@ -197,7 +197,7 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
       bytesToHex: bufferToHex,
       toBytes,
       privateToAddress,
-    } = require("@nomicfoundation/ethereumjs-util");
+    } = require("@ethereumjs/util");
 
     const privateKeys: Buffer[] = localAccountsHexPrivateKeys.map((h) =>
       toBytes(h)
@@ -210,9 +210,7 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
   }
 
   private _getPrivateKeyForAddress(address: Buffer): Buffer {
-    const {
-      bytesToHex: bufferToHex,
-    } = require("@nomicfoundation/ethereumjs-util");
+    const { bytesToHex: bufferToHex } = require("@ethereumjs/util");
     const pk = this._addressToPrivateKey.get(bufferToHex(address));
     if (pk === undefined) {
       throw new HardhatError(ERRORS.NETWORK.NOT_LOCAL_ACCOUNT, {
@@ -232,9 +230,7 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
   }
 
   private async _getNonce(address: Buffer): Promise<bigint> {
-    const { bytesToHex: bufferToHex } = await import(
-      "@nomicfoundation/ethereumjs-util"
-    );
+    const { bytesToHex: bufferToHex } = await import("@ethereumjs/util");
 
     const response = (await this._wrappedProvider.request({
       method: "eth_getTransactionCount",
@@ -249,11 +245,15 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
     chainId: number,
     privateKey: Buffer
   ): Promise<Uint8Array> {
-    const { AccessListEIP2930Transaction, LegacyTransaction } = await import(
-      "@nomicfoundation/ethereumjs-tx"
-    );
+    const {
+      AccessListEIP2930Transaction,
+      LegacyTransaction,
+      EOACodeEIP7702Transaction,
+    } = await import("@ethereumjs/tx");
 
-    const { Common } = await import("@nomicfoundation/ethereumjs-common");
+    const { Common } = await import("@ethereumjs/common");
+
+    const { toBytes } = await import("@ethereumjs/util");
 
     const txData = {
       ...transactionRequest,
@@ -272,8 +272,38 @@ export class LocalAccountsProvider extends ProviderWrapperWithChainId {
       ({ address, storageKeys }) => [address, storageKeys] as [Buffer, Buffer[]]
     );
 
+    // we convert the authorization list to the type
+    // that EOACodeEIP7702Transaction expects
+    const authorizationList = txData.authorizationList?.map(
+      ({ chainId: authChainId, address, nonce, yParity, r, s }) =>
+        // TODO: There is an error in the type definition of rpcAuthorizationList
+        // in the @ethereumjs/common@4.4.0 package where nonce is defined as an
+        // array but it should be a string. This is fixed in the alpha version
+        // of the package but is not yet released. To work around this, we wrap
+        // nonce in an array here. However, this will not be accepted by the
+        // node and will throw an error.
+        [
+          Buffer.from(toBytes(authChainId)),
+          address,
+          [Buffer.from(toBytes(nonce))],
+          yParity,
+          r,
+          s,
+        ] as [Buffer, Buffer, Buffer[], Buffer, Buffer, Buffer]
+    );
+
     let transaction;
-    if (txData.maxFeePerGas !== undefined) {
+    if (authorizationList !== undefined) {
+      transaction = EOACodeEIP7702Transaction.fromTxData(
+        {
+          ...txData,
+          accessList,
+          authorizationList,
+          gasPrice: undefined,
+        },
+        { common }
+      );
+    } else if (txData.maxFeePerGas !== undefined) {
       transaction = FeeMarketEIP1559Transaction.fromTxData(
         {
           ...txData,
@@ -320,9 +350,7 @@ export class HDWalletProvider extends LocalAccountsProvider {
       passphrase
     );
 
-    const {
-      bytesToHex: bufferToHex,
-    } = require("@nomicfoundation/ethereumjs-util");
+    const { bytesToHex: bufferToHex } = require("@ethereumjs/util");
     const privateKeysAsHex = privateKeys.map((pk) => bufferToHex(pk));
     super(provider, privateKeysAsHex);
   }

diff --git a/packages/hardhat-core/src/internal/core/providers/util.ts b/packages/hardhat-core/src/internal/core/providers/util.ts
@@ -53,7 +53,7 @@ export function normalizeHardhatNetworkAccountsConfig(
     return accountsConfig;
   }
 
-  const { bytesToHex } = require("@nomicfoundation/ethereumjs-util");
+  const { bytesToHex } = require("@ethereumjs/util");
 
   return derivePrivateKeys(
     accountsConfig.mnemonic,

diff --git a/packages/hardhat-core/src/internal/hardhat-network/jsonrpc/client.ts b/packages/hardhat-core/src/internal/hardhat-network/jsonrpc/client.ts
@@ -1,7 +1,4 @@
-import {
-  Address,
-  bytesToHex as bufferToHex,
-} from "@nomicfoundation/ethereumjs-util";
+import { Address, bytesToHex as bufferToHex } from "@ethereumjs/util";
 import fsExtra from "fs-extra";
 import * as t from "io-ts";
 import path from "path";

diff --git a/packages/hardhat-core/src/internal/hardhat-network/provider/node-types.ts b/packages/hardhat-core/src/internal/hardhat-network/provider/node-types.ts
@@ -72,7 +72,7 @@ export interface LegacyTransactionParams extends BaseTransactionParams {
 
 export interface AccessListTransactionParams extends BaseTransactionParams {
   gasPrice: bigint;
-  // We use this access list format because @nomicfoundation/ethereumjs-tx access list data
+  // We use this access list format because @ethereumjs/tx access list data
   // forces us to use it or stringify them
   accessList: AccessListBufferItem[];
   // We don't include chainId as it's not necessary, the node

diff --git a/packages/hardhat-core/src/internal/hardhat-network/provider/output.ts b/packages/hardhat-core/src/internal/hardhat-network/provider/output.ts
@@ -31,7 +31,8 @@ export interface RpcBlockOutput {
 export type RpcTransactionOutput =
   | LegacyRpcTransactionOutput
   | AccessListEIP2930RpcTransactionOutput
-  | EIP1559RpcTransactionOutput;
+  | EIP1559RpcTransactionOutput
+  | EOACodeEIP7702TransactionOutput;
 
 interface BaseRpcTransactionOutput {
   blockHash: string | null;
@@ -60,6 +61,15 @@ export type RpcAccessListOutput = Array<{
   storageKeys: string[];
 }>;
 
+export type RpcAuthorizationListOutput = Array<{
+  chainId: string;
+  address: string;
+  nonce: string;
+  yParity: string;
+  r: string;
+  s: string;
+}>;
+
 export interface AccessListEIP2930RpcTransactionOutput
   extends BaseRpcTransactionOutput {
   gasPrice: string;
@@ -75,6 +85,11 @@ export interface EIP1559RpcTransactionOutput extends BaseRpcTransactionOutput {
   chainId: string;
 }
 
+export interface EOACodeEIP7702TransactionOutput
+  extends EIP1559RpcTransactionOutput {
+  authorizationList?: RpcAuthorizationListOutput;
+}
+
 export interface RpcReceiptOutput {
   blockHash: string;
   blockNumber: string;