diff --git a/.typo-ci.yml b/.typo-ci.yml
index cc81123a8..1ba556565 100644
--- a/.typo-ci.yml
+++ b/.typo-ci.yml
@@ -2,4 +2,4 @@ excluded_words:
   - hydrooj
 excluded_files:
   - package.json
-  - .typo-ci.yml
\ No newline at end of file
+  - .typo-ci.yml
diff --git a/jest.config.js b/jest.config.js
index b9dea98c2..9725f81d9 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -1,7 +1,7 @@
 module.exports = {
     preset: '@shelf/jest-mongodb',
     transform: {
-        '^.+\\.ts?$': 'ts-jest'
+        '^.+\\.ts?$': 'ts-jest',
     },
     moduleFileExtensions: ['ts', 'js', 'json'],
     collectCoverage: true,
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 40fc0f9d5..95bfad782 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -95,7 +95,11 @@ export interface User extends Dictionary<any> {
 export type Udict = NumericDictionary<User>;
 
 export interface FileInfo {
+    /** duplicate to filename */
+    _id: string,
+    /** filename */
     name: string,
+    /** file size (in bytes) */
     size: number,
     etag: string,
     lastModified: Date,
@@ -139,6 +143,7 @@ export interface ProblemConfig {
     interactor?: string,
     user_extra_files?: string[],
     judge_extra_files?: string[],
+    outputs?: [string, number][],
     cases?: TestCaseConfig[],
     subtasks?: SubtaskConfig[],
 }
@@ -189,8 +194,8 @@ declare module './model/problem' {
         difficulty?: number,
         /** @deprecated */
         category?: string[],
-        /** @deprecated */
-        config: any,
+
+        config: string,
     }
 }
 export type { Pdoc } from './model/problem';
diff --git a/packages/hydrooj/src/model/problem.ts b/packages/hydrooj/src/model/problem.ts
index 07f3d52d5..bcd4fc8b4 100644
--- a/packages/hydrooj/src/model/problem.ts
+++ b/packages/hydrooj/src/model/problem.ts
@@ -142,12 +142,14 @@ export class ProblemModel {
         const payload = { name, ...pick(meta, ['size', 'lastModified', 'etag']) };
         if (!fileinfo) await ProblemModel.push(domainId, pid, 'data', { _id: name, ...payload });
         else await document.setSub(domainId, document.TYPE_PROBLEM, pid, 'data', name, payload);
+        await bus.emit('problem/addTestdata', domainId, pid, name, payload);
     }
 
     static async delTestdata(domainId: string, pid: number, name: string | string[]) {
         const names = (name instanceof Array) ? name : [name];
         await storage.del(names.map((t) => `problem/${domainId}/${pid}/testdata/${t}`));
         await ProblemModel.pull(domainId, pid, 'data', names);
+        await bus.emit('problem/delTestdata', domainId, pid, name);
     }
 
     static async addAdditionalFile(domainId: string, pid: number, name: string, f: Readable | Buffer | string) {
@@ -159,12 +161,14 @@ export class ProblemModel {
         const payload = { name, ...pick(meta, ['size', 'lastModified', 'etag']) };
         if (!fileinfo) await ProblemModel.push(domainId, pid, 'additional_file', { _id: name, ...payload });
         else await document.setSub(domainId, document.TYPE_PROBLEM, pid, 'additional_file', name, payload);
+        await bus.emit('problem/addAdditionalFile', domainId, pid, name, payload);
     }
 
     static async delAdditionalFile(domainId: string, pid: number, name: string | string[]) {
         const names = (name instanceof Array) ? name : [name];
         await storage.del(names.map((t) => `problem/${domainId}/${pid}/additional_file/${t}`));
         await ProblemModel.pull(domainId, pid, 'additional_file', names);
+        await bus.emit('problem/delAdditionalFile', domainId, pid, name);
     }
 
     static async random(domainId: string, query: FilterQuery<Pdoc>): Promise<string | null> {
diff --git a/packages/hydrooj/src/service/bus.ts b/packages/hydrooj/src/service/bus.ts
index 088937a51..7bf119ca7 100644
--- a/packages/hydrooj/src/service/bus.ts
+++ b/packages/hydrooj/src/service/bus.ts
@@ -5,9 +5,8 @@ import { argv } from 'yargs';
 import type { Handler } from './server';
 import { Logger } from '../logger';
 import type {
-    Mdoc, Pdoc, Rdoc, TrainingDoc, User,
+    Mdoc, Pdoc, Rdoc, TrainingDoc, User, Ddoc, DomainDoc, FileInfo,
 } from '../interface';
-import type { Ddoc, DomainDoc } from '../loader';
 import type { DocType } from '../model/document';
 import type { ProblemSolutionHandler } from '../handler/problem';
 import type { UserRegisterHandler } from '../handler/user';
@@ -80,6 +79,10 @@ export interface EventMap extends Record<string, any> {
     'problem/list': (query: FilterQuery<Pdoc>, handler: any) => VoidReturn
     'problem/get': (doc: Pdoc, handler: any) => VoidReturn
     'problem/delete': (domainId: string, docId: number) => VoidReturn
+    'problem/addTestdata': (domainId: string, docId: number, name: string, payload: FileInfo) => VoidReturn
+    'problem/delTestdata': (domainId: string, docId: number, name: string) => VoidReturn
+    'problem/addAdditionalFile': (domainId: string, docId: number, name: string, payload: FileInfo) => VoidReturn
+    'problem/delAdditionalFile': (domainId: string, docId: number, name: string) => VoidReturn
 
     'training/list': (query: FilterQuery<TrainingDoc>, handler: any) => VoidReturn
     'training/get': (tdoc: TrainingDoc, handler: any) => VoidReturn