From ff2ee9816e522117359750ba102290abf3f2e26d Mon Sep 17 00:00:00 2001
From: Jongsun Suh <jongsun.suh@icloud.com>
Date: Tue, 3 Dec 2024 04:08:00 -0500
Subject: [PATCH] Fix `any` types in `EngineService`

---
 app/core/Engine/Engine.test.ts          |  5 ++---
 app/core/Engine/Engine.ts               |  7 +++++--
 app/core/EngineService/EngineService.ts | 26 ++++++++++---------------
 3 files changed, 17 insertions(+), 21 deletions(-)

diff --git a/app/core/Engine/Engine.test.ts b/app/core/Engine/Engine.test.ts
index ef191cce1f32..59661ad2e920 100644
--- a/app/core/Engine/Engine.test.ts
+++ b/app/core/Engine/Engine.test.ts
@@ -5,13 +5,12 @@ import { zeroAddress } from 'ethereumjs-util';
 import { createMockAccountsControllerState } from '../../util/test/accountsControllerTestUtils';
 import { mockNetworkState } from '../../util/test/network';
 import MetaMetrics from '../Analytics/MetaMetrics';
-import { store } from '../../store';
+import { ReduxState, store } from '../../store';
 import { MetaMetricsEvents } from '../Analytics';
 import { NetworkState } from '@metamask/network-controller';
 import { Hex } from '@metamask/utils';
 import { MarketDataDetails } from '../../components/UI/Tokens';
 import { TransactionMeta } from '@metamask/transaction-controller';
-import { RootState } from '../../reducers';
 import { MetricsEventBuilder } from '../Analytics/MetricsEventBuilder';
 
 jest.unmock('./Engine');
@@ -369,7 +368,7 @@ describe('Transaction event handlers', () => {
   beforeEach(() => {
     engine = Engine.init({});
     jest.spyOn(MetaMetrics.getInstance(), 'trackEvent').mockImplementation();
-    jest.spyOn(store, 'getState').mockReturnValue({} as RootState);
+    jest.spyOn(store, 'getState').mockReturnValue({} as ReduxState);
   });
 
   afterEach(() => {
diff --git a/app/core/Engine/Engine.ts b/app/core/Engine/Engine.ts
index fc946c01115e..91ec951e1685 100644
--- a/app/core/Engine/Engine.ts
+++ b/app/core/Engine/Engine.ts
@@ -268,7 +268,7 @@ export class Engine {
   // eslint-disable-next-line @typescript-eslint/default-param-last
   constructor(
     initialState: Partial<EngineState> = {},
-    initialKeyringState?: KeyringControllerState | null,
+    initialKeyringState?: Partial<KeyringControllerState> | null,
   ) {
     this.controllerMessenger = new ExtendedControllerMessenger();
 
@@ -2179,7 +2179,10 @@ export default {
     instance = null;
   },
 
-  init(state: Partial<EngineState> | undefined, keyringState = null) {
+  init(
+    state: Partial<EngineState> | undefined,
+    keyringState: Partial<KeyringControllerState> | null = null,
+  ) {
     instance = Engine.instance || new Engine(state, keyringState);
     Object.freeze(instance);
     return instance;
diff --git a/app/core/EngineService/EngineService.ts b/app/core/EngineService/EngineService.ts
index c653e496c29b..432d174d175e 100644
--- a/app/core/EngineService/EngineService.ts
+++ b/app/core/EngineService/EngineService.ts
@@ -1,7 +1,7 @@
 import UntypedEngine from '../Engine';
-import AppConstants from '../AppConstants';
+import { Engine as TypedEngine } from '../Engine/Engine';
 import { getVaultFromBackup } from '../BackupVault';
-import { store as importedStore } from '../../store';
+import { store as importedStore, ReduxStore } from '../../store';
 import Logger from '../../util/Logger';
 import {
   NO_VAULT_IN_BACKUP_ERROR,
@@ -28,9 +28,7 @@ class EngineService {
    * @param store - Redux store
    */
 
-  // TODO: Replace "any" with type
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  initalizeEngine = (store: any) => {
+  initalizeEngine = (store: ReduxStore) => {
     trace({
       name: TraceName.EngineInitialization,
       op: TraceOperation.EngineInitialization,
@@ -39,17 +37,14 @@ class EngineService {
     });
     const reduxState = store.getState?.();
     const state = reduxState?.engine?.backgroundState || {};
-    // TODO: Replace "any" with type
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const Engine = UntypedEngine as any;
+    const Engine = UntypedEngine;
     Engine.init(state);
-    this.updateControllers(store, Engine);
+    // `Engine.init()` call mutates `typeof UntypedEngine` to `TypedEngine`
+    this.updateControllers(store, Engine as unknown as TypedEngine);
     endTrace({ name: TraceName.EngineInitialization });
   };
 
-  // TODO: Replace "any" with type
-  // eslint-disable-next-line @typescript-eslint/no-explicit-any
-  private updateControllers = (store: any, engine: any) => {
+  private updateControllers = (store: ReduxStore, engine: TypedEngine) => {
     if (!engine.context) {
       Logger.error(
         new Error(
@@ -96,9 +91,7 @@ class EngineService {
     const keyringState = await getVaultFromBackup();
     const reduxState = importedStore.getState?.();
     const state = reduxState?.engine?.backgroundState || {};
-    // TODO: Replace "any" with type
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const Engine = UntypedEngine as any;
+    const Engine = UntypedEngine;
     // This ensures we create an entirely new engine
     await Engine.destroyEngine();
     this.engineInitialized = false;
@@ -107,7 +100,8 @@ class EngineService {
         keyrings: [],
         vault: keyringState.vault,
       };
-      const instance = Engine.init(state, newKeyringState);
+      // `Engine.init()` call mutates `typeof UntypedEngine` to `Engine`
+      const instance = Engine.init(state, newKeyringState) as unknown as TypedEngine;
       if (instance) {
         this.updateControllers(importedStore, instance);
         // this is a hack to give the engine time to reinitialize