fix lint issues

app/core/RPCMethods/RPCMethodMiddleware.test.ts

@@ -377,7 +377,6 @@ describe('getRpcMethodMiddleware', () => {
       permissionController.createPermissionMiddleware({
         origin: hostMock,
       });
-    // @ts-expect-error TODO
     engine.push(permissionMiddleware);
     const middleware = getRpcMethodMiddleware(getMinimalOptions());
     engine.push(middleware);

app/core/RPCMethods/createUnsupportedMethodMiddleware/index.ts

@@ -2,14 +2,15 @@ import { rpcErrors } from '@metamask/rpc-errors';
 import type { JsonRpcMiddleware } from '@metamask/json-rpc-engine';
 
 import { UNSUPPORTED_RPC_METHODS } from '../utils';
+import { Json, JsonRpcParams } from '@metamask/utils';
 
 /**
  * Creates a middleware that rejects explicitly unsupported RPC methods with the
  * appropriate error.
  */
 const createUnsupportedMethodMiddleware = (): JsonRpcMiddleware<
-  unknown,
-  void
+  JsonRpcParams,
+  Json
 > =>
   async function unsupportedMethodMiddleware(req, _res, next, end) {
     if ((UNSUPPORTED_RPC_METHODS as Set<string>).has(req.method)) {

app/core/RPCMethods/utils.ts

@@ -76,7 +76,7 @@ export function makeMethodMiddlewareMaker<U>(
   const makeMethodMiddleware = (hooks: Record<string, unknown>) => {
     assertExpectedHook(hooks, expectedHookNames);
 
-    const methodMiddleware: JsonRpcMiddleware<JsonRpcParams, unknown> = async (
+    const methodMiddleware: JsonRpcMiddleware<JsonRpcParams, Json> = async (
       req,
       res,
       next,
@@ -88,7 +88,6 @@ export function makeMethodMiddlewareMaker<U>(
         try {
           // Implementations may or may not be async, so we must await them.
           return await implementation(
-            // @ts-expect-error JsonRpcId (number | string | void) doesn't match the permission middleware's id, which is (string | number | null)
             req,
             res,
             next,