diff --git a/packages/hydrooj/src/entry/cli.ts b/packages/hydrooj/src/entry/cli.ts
index 8b43e9654..543cd0bc3 100644
--- a/packages/hydrooj/src/entry/cli.ts
+++ b/packages/hydrooj/src/entry/cli.ts
@@ -4,7 +4,6 @@ import cac from 'cac';
 import { ObjectID } from 'mongodb';
 import { validate } from '../lib/validator';
 import options from '../options';
-import * as bus from '../service/bus';
 import db from '../service/db';
 import {
     lib, model, script, service,
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index c553305b0..7bda7d316 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -517,7 +517,7 @@ export interface JudgeResultBody {
     time?: number;
     memory?: number;
     message?: string | JudgeMessage;
-    compilerText?: string,
+    compilerText?: string;
 }
 
 export interface Task {
@@ -568,6 +568,13 @@ export interface OpCountDoc {
     opcount: number;
 }
 
+export interface OauthMap {
+    /** source openId */
+    _id: string;
+    /** target uid */
+    uid: number;
+}
+
 export interface Collections {
     'blacklist': BlacklistDoc;
     'contest': Tdoc;
@@ -582,11 +589,11 @@ export interface Collections {
     'user.preference': UserPreferenceDoc;
     'vuser': VUdoc;
     'user.group': GDoc;
-    'check': any;
+    'check': System;
     'message': MessageDoc;
     'token': TokenDoc;
     'status': any;
-    'oauth': any;
+    'oauth': OauthMap;
     'system': System;
     'task': Task;
     'storage': FileNode;
@@ -685,7 +692,6 @@ export interface HydroGlobal {
     script: Record<string, Script>,
     service: Service,
     lib: Lib,
-    stat: any,
     ui: UI,
     error: typeof import('./error'),
     Logger: typeof import('./logger').Logger,
diff --git a/packages/hydrooj/src/model/oauth.ts b/packages/hydrooj/src/model/oauth.ts
index 9eb83369b..93ddb4964 100644
--- a/packages/hydrooj/src/model/oauth.ts
+++ b/packages/hydrooj/src/model/oauth.ts
@@ -1,12 +1,6 @@
-import { Collection } from 'mongodb';
 import db from '../service/db';
 
-interface OauthMap {
-    _id: string, // source openId
-    uid: number, // target uid
-}
-
-const coll: Collection<OauthMap> = db.collection('oauth');
+const coll = db.collection('oauth');
 
 class OauthModel {
     static async get(_id: string) {