diff --git a/README.md b/README.md
index 7ab39a30b..96eb92206 100644
--- a/README.md
+++ b/README.md
@@ -113,7 +113,6 @@ Hydro 用户群：1085853538
 
 ## Unreleased
 
-- judge: breaking: 不再支持在 checker 等的编译阶段读取选手代码
 - judge: 添加 checker 编译缓存
 - ui: 优化题目详情页面 OGP 信息
 - core&ui: 升级 simplewebauthn
@@ -123,19 +122,25 @@ Hydro 用户群：1085853538
 - ui&judge: 添加栈空间回显
 - install: 在树莓派中自动启用 cgroup.memory
 - install: 添加 shm 空间大小警告
-- vjudge: 使用 vjudge.mount 表替代 domain.mount
 - core: 升级到 cordis@4
 - framework: 支持同时启用多个 renderer
 - core: 分离 HMR 和 Watcher 组件
 - core: i18n: 添加 interface 选项
 - judge: 添加 kattis checker 支持
-- core: 移除旧版本 bus 调用
 - migrate: 修复 hustoj 自动运行
-- core: 强制要求使用 inject 声明插件依赖
-- core: 移除 global.Hydro.service.db
-- core: 移除 global.Hydro.service.service
-- core: 移除 global.Hydro.service.storage
 - core: Settings: 支持使用 Schemastery
+- ui: 更新系统设置页面样式
+- import-qduoj: 修复 spj=null
+
+### Breaking API Changes
+
+- vjudge: 使用 vjudge.mount 表替代 domain.mount
+- judge: breaking: 不再支持在 checker 等的编译阶段读取选手代码
+- core: 强制要求使用 inject 声明插件依赖
+- core: 移除旧版本 bus 调用
+- core: 移除 global.Hydro.service
+- core: 移除 global.Hydro.ui.template
+- core: 移除 global.Hydro.lib
 
 ## Hydro 4.19.0 / UI 4.57.0
 
diff --git a/packages/elastic/index.ts b/packages/elastic/index.ts
index 5f9db740d..ae8a228aa 100644
--- a/packages/elastic/index.ts
+++ b/packages/elastic/index.ts
@@ -19,7 +19,7 @@ const processDocument = (doc: Partial<ProblemDoc>) => {
     return _.omit(doc, indexOmit);
 };
 
-global.Hydro.lib.problemSearch = async (domainId, q, opts) => {
+async function problemSearch(domainId, q, opts) {
     const allowedSize = SystemModel.get('elasic-search.indexSize') || 10000;
     const size = opts?.limit || SystemModel.get('pagination.problem');
     const from = Math.min(allowedSize - size, opts?.skip || 0);
@@ -56,7 +56,7 @@ global.Hydro.lib.problemSearch = async (domainId, q, opts) => {
         total: typeof res.hits.total === 'number' ? res.hits.total : res.hits.total.value,
         hits: Array.from(new Set(hits)),
     };
-};
+}
 
 async function run({ domainId }, report) {
     try {
@@ -109,4 +109,5 @@ export const apply = (ctx: Context) => {
         }),
         run,
     );
+    ctx.provideModule('problemSearch', 'elastic', problemSearch);
 };
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index 1c3473408..568d76298 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -109,7 +109,7 @@ export class ProblemMainHandler extends Handler {
         // eslint-disable-next-line @typescript-eslint/no-shadow
         const query = this.queryContext.query;
         const psdict = {};
-        const search = global.Hydro.lib.problemSearch || defaultSearch;
+        const search = Object.values(global.Hydro.module.problemSearch)[0] || defaultSearch;
         const parsed = parser.parse(q, {
             keywords: ['category', 'difficulty', 'namespace'],
             offsets: false,
diff --git a/packages/hydrooj/src/init.ts b/packages/hydrooj/src/init.ts
index f56f4d230..3e1a01864 100644
--- a/packages/hydrooj/src/init.ts
+++ b/packages/hydrooj/src/init.ts
@@ -11,8 +11,6 @@ if (!global.Hydro) {
         // @ts-ignore
         model: {},
         script: {},
-        // @ts-ignore
-        lib: {},
         module: new Proxy({} as any, {
             get(self, key) {
                 self[key] ||= {};
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index 8a9a4823e..29b7a1823 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -613,15 +613,6 @@ export interface ProblemSearchOptions {
 
 export type ProblemSearch = (domainId: string, q: string, options?: ProblemSearchOptions) => Promise<ProblemSearchResponse>;
 
-export interface Lib extends Record<string, any> {
-    difficulty: typeof import('./lib/difficulty').default;
-    buildContent: typeof import('./lib/content').buildContent;
-    mail: typeof import('./lib/mail');
-    rating: typeof import('./lib/rating').default;
-    testdataConfig: typeof import('./lib/testdataConfig');
-    problemSearch: ProblemSearch;
-}
-
 export type UIInjectableFields = 'ProblemAdd' | 'Notification' | 'Nav' | 'UserDropdown' | 'DomainManage' | 'ControlPanel';
 export interface UI {
     nodes: Record<UIInjectableFields, any[]>,
@@ -638,13 +629,13 @@ export interface ModuleInterfaces {
         lockUsername?: boolean;
     };
     hash: (password: string, salt: string, user: User) => boolean | string | Promise<string>;
+    problemSearch: ProblemSearch;
 }
 
 export interface HydroGlobal {
     version: Record<string, string>;
     model: Model;
     script: Record<string, Script>;
-    lib: Lib;
     module: { [K in keyof ModuleInterfaces]: Record<string, ModuleInterfaces[K]> };
     ui: UI;
     error: typeof import('./error');
diff --git a/packages/hydrooj/src/lib/avatar.ts b/packages/hydrooj/src/lib/avatar.ts
index 809415fe7..ea962f997 100644
--- a/packages/hydrooj/src/lib/avatar.ts
+++ b/packages/hydrooj/src/lib/avatar.ts
@@ -34,4 +34,3 @@ export function validate(input: string) {
 }
 
 export default avatar;
-global.Hydro.lib.avatar = avatar;
diff --git a/packages/hydrooj/src/lib/content.ts b/packages/hydrooj/src/lib/content.ts
index b777c4177..f79078635 100644
--- a/packages/hydrooj/src/lib/content.ts
+++ b/packages/hydrooj/src/lib/content.ts
@@ -76,5 +76,3 @@ export function buildContent(source: ProblemSource, type: 'markdown' | 'html' =
             ...source.source ? [`## ${_('Source')}`, '', source.source, ''] : [],
         ].join('\n');
 }
-
-global.Hydro.lib.buildContent = buildContent;
diff --git a/packages/hydrooj/src/lib/difficulty.ts b/packages/hydrooj/src/lib/difficulty.ts
index 231376806..32311633b 100644
--- a/packages/hydrooj/src/lib/difficulty.ts
+++ b/packages/hydrooj/src/lib/difficulty.ts
@@ -43,4 +43,3 @@ function difficultyAlgorithm(nSubmit: number, nAccept: number) {
 }
 
 export default difficultyAlgorithm;
-global.Hydro.lib.difficulty = difficultyAlgorithm;
diff --git a/packages/hydrooj/src/lib/mail.ts b/packages/hydrooj/src/lib/mail.ts
index dbaa5779c..87a364cad 100644
--- a/packages/hydrooj/src/lib/mail.ts
+++ b/packages/hydrooj/src/lib/mail.ts
@@ -37,7 +37,3 @@ export async function sendMail(to: string, subject: string, text: string, html:
     }
     return t;
 }
-
-global.Hydro.lib.mail = {
-    sendMail,
-};
diff --git a/packages/hydrooj/src/lib/rating.ts b/packages/hydrooj/src/lib/rating.ts
index 5c89c6678..bb4f14207 100644
--- a/packages/hydrooj/src/lib/rating.ts
+++ b/packages/hydrooj/src/lib/rating.ts
@@ -119,5 +119,3 @@ function calculate(users: RatingInputUser[]): RatingOutputUser[] {
 }
 
 export default calculate;
-
-global.Hydro.lib.rating = calculate;
diff --git a/packages/hydrooj/src/lib/testdataConfig.ts b/packages/hydrooj/src/lib/testdataConfig.ts
index c451b0257..512f0ce5f 100644
--- a/packages/hydrooj/src/lib/testdataConfig.ts
+++ b/packages/hydrooj/src/lib/testdataConfig.ts
@@ -37,5 +37,3 @@ export async function parseConfig(config: string | ProblemConfigFile = {}) {
     if (cfg.filename && result.type === 'default') result.subType = cfg.filename;
     return result;
 }
-
-global.Hydro.lib.testdataConfig = { parseConfig };
diff --git a/packages/hydrooj/src/plugin-api.ts b/packages/hydrooj/src/plugin-api.ts
index 1c5782b28..775d3ed51 100644
--- a/packages/hydrooj/src/plugin-api.ts
+++ b/packages/hydrooj/src/plugin-api.ts
@@ -44,6 +44,8 @@ export { default as mime } from './lib/mime';
 export { default as difficultyAlgorithm } from './lib/difficulty';
 export { default as rating } from './lib/rating';
 export { default as avatar } from './lib/avatar';
+export { parseConfig as testdataConfig } from './lib/testdataConfig';
+export { sendMail } from './lib/mail';
 /** @deprecated use Handler.paginate instead */
 export const paginate = db.paginate.bind(db);
 /** @deprecated use db.ranked instead */
diff --git a/packages/hydrooj/src/service/hmr.ts b/packages/hydrooj/src/service/hmr.ts
index 1ecb0549c..b87962169 100644
--- a/packages/hydrooj/src/service/hmr.ts
+++ b/packages/hydrooj/src/service/hmr.ts
@@ -144,7 +144,7 @@ export default class HMR extends Service {
         }
     }
 
-    private triggerLocalReload() {
+    private async triggerLocalReload() {
         this.analyzeChanges();
 
         /** plugins pending classification */
@@ -207,10 +207,11 @@ export default class HMR extends Service {
             return rollback();
         }
 
-        const reload = (plugin: any, runtime?: Plugin.Runtime) => {
+        const reload = async (plugin: any, runtime?: Plugin.Runtime) => {
             if (!runtime) return;
             for (const oldFiber of runtime.scopes) {
-                oldFiber.parent.plugin(plugin, oldFiber.config);
+                // eslint-disable-next-line no-await-in-loop
+                await oldFiber.parent.plugin(plugin, oldFiber.config);
             }
         };
 
@@ -226,7 +227,8 @@ export default class HMR extends Service {
                 }
 
                 try {
-                    reload(attempts[filename], runtime);
+                    // eslint-disable-next-line no-await-in-loop
+                    await reload(attempts[filename], runtime);
                     logger.info('reload plugin at %c', path);
                 } catch (err) {
                     logger.warn('failed to reload plugin at %c', path);
@@ -240,7 +242,7 @@ export default class HMR extends Service {
             for (const [plugin, { filename, runtime }] of reloads) {
                 try {
                     this.ctx.registry.delete(attempts[filename]);
-                    reload(plugin, runtime);
+                    await reload(plugin, runtime);
                 } catch (err) {
                     logger.warn(err);
                 }
diff --git a/packages/sonic/index.ts b/packages/sonic/index.ts
index 74c4e4414..2435cdaa3 100644
--- a/packages/sonic/index.ts
+++ b/packages/sonic/index.ts
@@ -10,7 +10,7 @@ export const inject = { 'sonic': { required: false } };
 export function apply(ctx: Context) {
     ctx.plugin(SonicService);
 
-    global.Hydro.lib.problemSearch = async (domainId, query, opts) => {
+    ctx.provideModule('problemSearch', 'sonic', async (domainId, query, opts) => {
         const limit = opts?.limit || SystemModel.get('pagination.problem');
         let hits = await ctx.sonic.query('problem', `${domainId}@title`, query, { limit });
         if (!opts.skip) {
@@ -29,7 +29,7 @@ export function apply(ctx: Context) {
             total: hits.length,
             hits,
         };
-    };
+    });
 
     async function run({ domainId }, report) {
         if (domainId) await ctx.sonic.flushb('problem', domainId);
diff --git a/packages/ui-default/backendlib/builder.ts b/packages/ui-default/backendlib/builder.ts
index 0bc30d32f..ee878675d 100644
--- a/packages/ui-default/backendlib/builder.ts
+++ b/packages/ui-default/backendlib/builder.ts
@@ -3,7 +3,6 @@ import {
   Context, fs, Handler, Logger, NotFoundError, param, SettingModel, sha1,
   size, SystemModel, Types, UiContextBase,
 } from 'hydrooj';
-import { debounce } from 'lodash';
 import { tmpdir } from 'os';
 import {
   basename, join, relative, resolve,
@@ -118,6 +117,7 @@ export async function buildUI() {
   }
   for (const lang in global.Hydro.locales) {
     if (!/^[a-zA-Z_]+$/.test(lang)) continue;
+    if (!global.Hydro.locales[lang].__interface) continue;
     const str = `window.LOCALES=${JSON.stringify(global.Hydro.locales[lang][Symbol.for('iterate')])};`;
     addFile(`lang-${lang}.js`, str);
   }
@@ -160,7 +160,7 @@ export async function apply(ctx: Context) {
   ctx.Route('constant', '/lazy/:version/:name', UiConstantsHandler);
   ctx.Route('constant', '/resource/:version/:name', UiConstantsHandler);
   ctx.on('app/started', buildUI);
-  const debouncedBuildUI = debounce(buildUI, 2000, { trailing: true });
+  const debouncedBuildUI = ctx.debounce(buildUI, 2000);
   const triggerHotUpdate = (path?: string) => {
     if (path && !path.includes('/ui-default/') && !path.includes('/public/') && !path.includes('/frontend/')) return;
     debouncedBuildUI();
diff --git a/packages/ui-default/backendlib/markdown.js b/packages/ui-default/backendlib/markdown.js
index ad675fa9a..65de87cda 100644
--- a/packages/ui-default/backendlib/markdown.js
+++ b/packages/ui-default/backendlib/markdown.js
@@ -59,6 +59,6 @@ function renderInline(text) {
   return md.renderInline(text);
 }
 
-global.Hydro.lib.markdown = module.exports = {
+module.exports = {
   md, plugin, render, renderInline,
 };
diff --git a/packages/ui-default/backendlib/template.ts b/packages/ui-default/backendlib/template.ts
index c78b6db81..cc4ec2106 100644
--- a/packages/ui-default/backendlib/template.ts
+++ b/packages/ui-default/backendlib/template.ts
@@ -133,7 +133,6 @@ class Nunjucks extends nunjucks.Environment {
     this.addGlobal('utils', { status });
     this.addGlobal('avatarUrl', avatar);
     this.addGlobal('formatSeconds', misc.formatSeconds);
-    this.addGlobal('lib', global.Hydro.lib);
     this.addGlobal('model', global.Hydro.model);
     this.addGlobal('ui', global.Hydro.ui);
     this.addGlobal('isIE', (str) => {