feat: add isEVMAccount helper

src/eth/index.ts

@@ -1,2 +1,3 @@
 export * from './erc4337';
 export * from './types';
+export * from './utils';

src/eth/utils.test.ts

@@ -0,0 +1,17 @@
+import { EthAccountType } from '.';
+import { BtcAccountType } from '../btc';
+import { isEvmAccountType } from './utils';
+
+describe('isEvmAccountType', () => {
+  it.each([
+    [EthAccountType.Eoa, true],
+    [EthAccountType.Erc4337, true],
+    [BtcAccountType.P2wpkh, false],
+    [{}, false],
+    [null, false],
+    ['bitcoin', false],
+  ])('%s should return %s', (account, result) => {
+    // @ts-expect-error for error cases
+    expect(isEvmAccountType(account)).toBe(result);
+  });
+});

src/eth/utils.ts

@@ -0,0 +1,11 @@
+import type { InternalAccountType } from '../internal';
+import { EthAccountType } from './types';
+
+/**
+ * Checks if the given type is an EVM account type.
+ * @param type - The type to check.
+ * @returns Returns true if the type is an EVM account type, false otherwise.
+ */
+export function isEvmAccountType(type: InternalAccountType): boolean {
+  return type === EthAccountType.Eoa || type === EthAccountType.Erc4337;
+}

src/internal/types.ts

@@ -10,6 +10,8 @@ import {
 } from '../eth/types';
 import { exactOptional, object } from '../superstruct';
 
+export type InternalAccountType = EthAccountType | BtcAccountType;
+
 export const InternalAccountMetadataStruct = object({
   metadata: object({
     name: string(),
@@ -75,7 +77,12 @@ export const InternalAccountStructs: Record<
   [`${BtcAccountType.P2wpkh}`]: InternalBtcP2wpkhAccountStruct,
 };
 
-export const InternalAccountStruct = define(
+export type InternalAccountTypes =
+  | InternalEthEoaAccount
+  | InternalEthErc4337Account
+  | InternalBtcP2wpkhAccount;
+
+export const InternalAccountStruct = define<InternalAccountTypes>(
   'InternalAccount',
   (value: unknown) => {
     const account = mask(value, BaseKeyringAccountStruct);