feat: add Monad Testnet to network-controller and controller-utils

packages/controller-utils/CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add Monad Testnet to various constants, enums, and types ([#5724](https://github.com/MetaMask/core/pull/5724))
+  - Add `MONAD_TESTNET` to `TESTNET_TICKER_SYMBOLS`
+  - Add `monad-testnet` to `BUILT_IN_NETWORKS`
+  - Add `MonadTestnet` to `BuiltInNetworkName` enum
+  - Add `monad-testnet` to `ChainId` type
+  - Add `MonadTestnet` to `NetworksTicker` enum
+  - Add `MonadTestnet` to `BlockExplorerUrl` quasi-enum
+  - Add `MonadTestnet` to `NetworkNickname` quasi-enum
+
 ## [11.7.0]
 
 ### Added

packages/controller-utils/src/constants.ts

@@ -57,6 +57,7 @@ export const TESTNET_TICKER_SYMBOLS = {
  */
 export const BUILT_IN_CUSTOM_NETWORKS_RPC = {
   MEGAETH_TESTNET: 'https://carrot.megaeth.com/rpc',
+  MONAD_TESTNET: 'https://testnet-rpc.monad.xyz',
 };
 
 /**
@@ -112,6 +113,13 @@ export const BUILT_IN_NETWORKS = {
       blockExplorerUrl: BlockExplorerUrl['megaeth-testnet'],
     },
   },
+  [NetworkType['monad-testnet']]: {
+    chainId: ChainId['monad-testnet'],
+    ticker: NetworksTicker['monad-testnet'],
+    rpcPrefs: {
+      blockExplorerUrl: BlockExplorerUrl['monad-testnet'],
+    },
+  },
   [NetworkType.rpc]: {
     chainId: undefined,
     blockExplorerUrl: undefined,

packages/controller-utils/src/types.ts

@@ -18,6 +18,7 @@ export type InfuraNetworkType =
  */
 export const CustomNetworkType = {
   'megaeth-testnet': 'megaeth-testnet',
+  'monad-testnet': 'monad-testnet',
 } as const;
 export type CustomNetworkType =
   (typeof CustomNetworkType)[keyof typeof CustomNetworkType];
@@ -76,6 +77,7 @@ export enum BuiltInNetworkName {
   LineaMainnet = 'linea-mainnet',
   Aurora = 'aurora',
   MegaETHTestnet = 'megaeth-testnet',
+  MonadTestnet = 'monad-testnet',
 }
 
 /**
@@ -92,6 +94,7 @@ export const ChainId = {
   [BuiltInNetworkName.LineaSepolia]: '0xe705', // toHex(59141)
   [BuiltInNetworkName.LineaMainnet]: '0xe708', // toHex(59144)
   [BuiltInNetworkName.MegaETHTestnet]: '0x18c6', // toHex(6342)
+  [BuiltInNetworkName.MonadTestnet]: '0x279f', // toHex(10143)
 } as const;
 export type ChainId = (typeof ChainId)[keyof typeof ChainId];
 
@@ -109,6 +112,7 @@ export enum NetworksTicker {
   'linea-sepolia' = 'LineaETH',
   'linea-mainnet' = 'ETH',
   'megaeth-testnet' = 'MegaETH',
+  'monad-testnet' = 'MON',
   // TODO: Either fix this lint violation or explain why it's necessary to ignore.
   // eslint-disable-next-line @typescript-eslint/naming-convention
   rpc = '',
@@ -122,6 +126,7 @@ export const BlockExplorerUrl = {
   [BuiltInNetworkName.LineaSepolia]: 'https://sepolia.lineascan.build',
   [BuiltInNetworkName.LineaMainnet]: 'https://lineascan.build',
   [BuiltInNetworkName.MegaETHTestnet]: 'https://megaexplorer.xyz',
+  [BuiltInNetworkName.MonadTestnet]: 'https://testnet.monadexplorer.com',
 } as const satisfies Record<BuiltInNetworkType, string>;
 export type BlockExplorerUrl =
   (typeof BlockExplorerUrl)[keyof typeof BlockExplorerUrl];
@@ -134,6 +139,7 @@ export const NetworkNickname = {
   [BuiltInNetworkName.LineaSepolia]: 'Linea Sepolia',
   [BuiltInNetworkName.LineaMainnet]: 'Linea',
   [BuiltInNetworkName.MegaETHTestnet]: 'Mega Testnet',
+  [BuiltInNetworkName.MonadTestnet]: 'Monad Testnet',
 } as const satisfies Record<BuiltInNetworkType, string>;
 export type NetworkNickname =
   (typeof NetworkNickname)[keyof typeof NetworkNickname];

packages/network-controller/CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Add Monad Testnet as default network ([#5724](https://github.com/MetaMask/core/pull/5724))
+
 ## [23.3.0]
 
 ### Added

packages/network-controller/src/NetworkController.ts

@@ -7,6 +7,7 @@ import { BaseController } from '@metamask/base-controller';
 import type { Partialize } from '@metamask/controller-utils';
 import {
   InfuraNetworkType,
+  CustomNetworkType,
   NetworkType,
   isSafeChainId,
   isInfuraNetworkType,
@@ -15,7 +16,6 @@ import {
   NetworkNickname,
   BUILT_IN_CUSTOM_NETWORKS_RPC,
   BUILT_IN_NETWORKS,
-  BuiltInNetworkName,
 } from '@metamask/controller-utils';
 import type { PollingBlockTrackerOptions } from '@metamask/eth-block-tracker';
 import EthQuery from '@metamask/eth-query';
@@ -728,26 +728,39 @@ function getDefaultCustomNetworkConfigurationsByChainId(): Record<
   Hex,
   NetworkConfiguration
 > {
-  const { ticker, rpcPrefs } =
-    BUILT_IN_NETWORKS[BuiltInNetworkName.MegaETHTestnet];
-  return {
-    [ChainId[BuiltInNetworkName.MegaETHTestnet]]: {
+  return Object.values(CustomNetworkType).reduce<
+    Record<Hex, NetworkConfiguration>
+  >((obj, customNetworkType) => {
+    const chainId = ChainId[customNetworkType];
+    const { ticker, rpcPrefs } = BUILT_IN_NETWORKS[customNetworkType];
+    // It converts client id to upper case and replace '-' with '_'
+    // to match the key in BUILT_IN_CUSTOM_NETWORKS_RPC
+    // e.g. 'megaeth-testnet' to 'MEGAETH_TESTNET'
+    // e.g. 'monad-testnet' to 'MONAD_TESTNET'
+    // TODO: Refactor controller-utils to use the same format as others
+    const rpcEndpointUrlKey = customNetworkType
+      .toUpperCase()
+      .replace('-', '_') as keyof typeof BUILT_IN_CUSTOM_NETWORKS_RPC;
+
+    const networkConfiguration: NetworkConfiguration = {
       blockExplorerUrls: [rpcPrefs.blockExplorerUrl],
-      chainId: ChainId[BuiltInNetworkName.MegaETHTestnet],
+      chainId: ChainId[customNetworkType],
       defaultRpcEndpointIndex: 0,
       defaultBlockExplorerUrlIndex: 0,
-      name: NetworkNickname[BuiltInNetworkName.MegaETHTestnet],
+      name: NetworkNickname[customNetworkType],
       nativeCurrency: ticker,
       rpcEndpoints: [
         {
           failoverUrls: [],
-          networkClientId: BuiltInNetworkName.MegaETHTestnet,
+          networkClientId: customNetworkType,
           type: RpcEndpointType.Custom,
-          url: BUILT_IN_CUSTOM_NETWORKS_RPC.MEGAETH_TESTNET,
+          url: BUILT_IN_CUSTOM_NETWORKS_RPC[rpcEndpointUrlKey],
         },
       ],
-    },
-  };
+    };
+
+    return { ...obj, [chainId]: networkConfiguration };
+  }, {});
 }
 
 /**

packages/network-controller/src/types.ts

@@ -1,4 +1,4 @@
-import type { ChainId, InfuraNetworkType } from '@metamask/controller-utils';
+import type { InfuraNetworkType, ChainId } from '@metamask/controller-utils';
 import type { BlockTracker as BaseBlockTracker } from '@metamask/eth-block-tracker';
 import type { SafeEventEmitterProvider } from '@metamask/eth-json-rpc-provider';
 import type { Hex } from '@metamask/utils';
@@ -57,4 +57,6 @@ export type NetworkClientConfiguration =
 /**
  * The Chain ID representing the additional networks to be included as default.
  */
-export type AdditionalDefaultNetwork = (typeof ChainId)['megaeth-testnet'];
+export type AdditionalDefaultNetwork =
+  | (typeof ChainId)['megaeth-testnet']
+  | (typeof ChainId)['monad-testnet'];