diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 897e47b2c..98590808a 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -33,7 +33,6 @@
         "markdown-it-table-of-contents": "^0.4.4",
         "moment-timezone": "^0.5.31",
         "mongodb": "^3.5.9",
-        "mongodb-watcher": "^1.3.0",
         "nodemailer": "^6.4.10",
         "nunjucks": "^3.2.2",
         "prismjs": "^1.20.0",
@@ -71,4 +70,4 @@
         "build": "tsc",
         "build:watch": "tsc --watch"
     }
-}
\ No newline at end of file
+}
diff --git a/packages/hydrooj/src/service/db.ts b/packages/hydrooj/src/service/db.ts
index f7613dbae..9dc5d780f 100644
--- a/packages/hydrooj/src/service/db.ts
+++ b/packages/hydrooj/src/service/db.ts
@@ -1,5 +1,4 @@
 import mongodb from 'mongodb';
-import MongoWatcher from 'mongodb-watcher';
 import * as bus from './bus';
 import options from '../options';
 
@@ -16,12 +15,6 @@ mongodb.MongoClient.connect(mongourl, { useNewUrlParser: true, useUnifiedTopolog
     .then((Client) => {
         db = Client.db(opts.name);
         global.Hydro.service.db.db = db;
-        // eslint-disable-next-line @typescript-eslint/no-unused-vars
-        const watcher = new MongoWatcher(db, {
-            longCursorThreshold: 100,
-            largeInsertThreshold: 1024 * 30,
-            largeFetchThreshold: 1024 * 30,
-        });
         bus.publish('system_database_connected', null);
     });
 
diff --git a/tsconfig.build.json b/tsconfig.build.json
new file mode 100644
index 000000000..daefa179e
--- /dev/null
+++ b/tsconfig.build.json
@@ -0,0 +1,21 @@
+{
+    "compilerOptions": {
+        "target": "es2019",
+        "module": "commonjs",
+        "esModuleInterop": true,
+        "moduleResolution": "node",
+        "declaration": true,
+        "sourceMap": true,
+        "composite": true,
+        "strictBindCallApply": true,
+        "experimentalDecorators": true,
+        "outDir": "build",
+        "rootDir": "build"
+    },
+    "include": [
+        "build"
+    ],
+    "exclude": [
+        "packages"
+    ]
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
index 8d0cdb884..6215b71af 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -16,6 +16,7 @@
         { "path": "packages/login-with-github" },
         { "path": "packages/login-with-google" },
         { "path": "packages/migrate-vijos" },
+        { "path": "tsconfig.build.json" },
     ],
     "files": [],
 }
\ No newline at end of file