fix jest

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"
     }
-}
+}

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);
     });