diff --git a/lib/app.ts b/lib/app.ts
index 0eb2c999d..38ad7c64e 100644
--- a/lib/app.ts
+++ b/lib/app.ts
@@ -1,46 +1,39 @@
-'use strict'
+import { Revision, sequelize } from './models'
+import { config } from './config'
+import { logger } from './logger'
 
-import { Revision } from "./models"
-import { sequelize } from './models'
+const express = require('express')
 
-// app
-// external modules
-const express = require('express');
+const ejs = require('ejs')
+const passport = require('passport')
+const methodOverride = require('method-override')
+const cookieParser = require('cookie-parser')
+const compression = require('compression')
+const session = require('express-session')
+const SequelizeStore = require('connect-session-sequelize')(session.Store)
+const fs = require('fs')
+const path = require('path')
 
-const ejs = require('ejs');
-const passport = require('passport');
-const methodOverride = require('method-override');
-const cookieParser = require('cookie-parser');
-const compression = require('compression');
-const session = require('express-session');
-const SequelizeStore = require('connect-session-sequelize')(session.Store);
-const fs = require('fs');
-const path = require('path');
-
-const morgan = require('morgan');
-const passportSocketIo = require('passport.socketio');
-const helmet = require('helmet');
-const i18n = require('i18n');
-const flash = require('connect-flash');
-
-// core
-const config = require('./config');
-const logger = require('./logger');
-const errors = require('./errors');
-const csp = require('./csp');
+const morgan = require('morgan')
+const passportSocketIo = require('passport.socketio')
+const helmet = require('helmet')
+const i18n = require('i18n')
+const flash = require('connect-flash')
+const errors = require('./errors')
+const csp = require('./csp')
 
 // server setup
-const app = express();
-let server: any = null;
+const app = express()
+let server: any = null
 if (config.useSSL) {
   const ca = (function () {
-    let i, len, results;
+    let i, len, results
     results = []
     for (i = 0, len = config.sslCAPath.length; i < len; i++) {
       results.push(fs.readFileSync(config.sslCAPath[i], 'utf8'))
     }
     return results
-  })();
+  })()
   const options = {
     key: fs.readFileSync(config.sslKeyPath, 'utf8'),
     cert: fs.readFileSync(config.sslCertPath, 'utf8'),
@@ -48,7 +41,7 @@ if (config.useSSL) {
     dhparam: fs.readFileSync(config.dhParamPath, 'utf8'),
     requestCert: false,
     rejectUnauthorized: false
-  };
+  }
   server = require('https').createServer(options, app)
 } else {
   server = require('http').createServer(app)
@@ -64,14 +57,14 @@ app.use(morgan('combined', {
 }))
 
 // socket io
-const io = require('socket.io')(server);
+const io = require('socket.io')(server)
 io.engine.ws = new (require('ws').Server)({
   noServer: true,
   perMessageDeflate: false
 })
 
 // others
-const realtime = require('./realtime');
+const realtime = require('./realtime')
 
 // assign socket io to realtime
 realtime.io = io
@@ -82,7 +75,7 @@ app.use(methodOverride('_method'))
 // session store
 const sessionStore = new SequelizeStore({
   db: sequelize
-});
+})
 
 // compression
 app.use(compression())
@@ -152,7 +145,7 @@ app.use(session({
 }))
 
 // session resumption
-const tlsSessionStore = {};
+const tlsSessionStore = {}
 server.on('newSession', function (id, data, cb) {
   tlsSessionStore[id.toString('hex')] = data
   cb()
@@ -243,12 +236,12 @@ io.sockets.on('connection', realtime.connection)
 
 // listen
 function startListen () {
-  let address;
+  let address
   const listenCallback = function () {
-    const schema = config.useSSL ? 'HTTPS' : 'HTTP';
+    const schema = config.useSSL ? 'HTTPS' : 'HTTP'
     logger.info('%s Server listening at %s', schema, address)
     realtime.maintenance = false
-  };
+  }
 
   // use unix domain socket if 'path' is specified
   if (config.path) {
@@ -287,7 +280,7 @@ function handleTermSignals () {
   realtime.maintenance = true
   // disconnect all socket.io clients
   Object.keys(io.sockets.sockets).forEach(function (key) {
-    const socket = io.sockets.sockets[key];
+    const socket = io.sockets.sockets[key]
     // notify client server going into maintenance status
     socket.emit('maintenance')
     setTimeout(function () {
@@ -307,7 +300,7 @@ function handleTermSignals () {
         }
       })
     }
-  }, 100);
+  }, 100)
 }
 process.on('SIGINT', handleTermSignals)
 process.on('SIGTERM', handleTermSignals)
diff --git a/lib/csp.js b/lib/csp.js
index fe8bea012..b778e7c32 100644
--- a/lib/csp.js
+++ b/lib/csp.js
@@ -1,4 +1,5 @@
-var config = require('./config')
+import { config } from './config'
+
 var uuid = require('uuid')
 
 var CspStrategy = {}
diff --git a/lib/letter-avatars.ts b/lib/letter-avatars.ts
index f5c27a9d5..2f9a27118 100644
--- a/lib/letter-avatars.ts
+++ b/lib/letter-avatars.ts
@@ -1,7 +1,7 @@
 'use strict'
 import { createHash } from 'crypto'
 import randomColor from 'randomcolor'
-import config from './config'
+import { config } from './config'
 
 // core
 export function generateAvatar (name: string): string {
diff --git a/lib/models/index.ts b/lib/models/index.ts
index c5eb80237..696547bf9 100644
--- a/lib/models/index.ts
+++ b/lib/models/index.ts
@@ -1,22 +1,20 @@
-import {Sequelize} from 'sequelize-typescript';
-import {Author} from './author';
-import {Note} from './note';
-import {Revision} from './revision';
-import {Temp} from './temp';
-import {User} from './user';
+import { Sequelize } from 'sequelize-typescript'
+import { Author } from './author'
+import { Note } from './note'
+import { Revision } from './revision'
+import { Temp } from './temp'
+import { User } from './user'
 
-const {cloneDeep} = require('lodash')
+import { logger } from '../logger'
+import { config } from '../config'
 
-// core
-var config = require('../config')
-var logger = require('../logger')
-
-var dbconfig = cloneDeep(config.db)
+const { cloneDeep } = require('lodash')
+const dbconfig = cloneDeep(config.db)
 dbconfig.logging = config.debug ? (data) => {
   logger.info(data)
 } : false
 
-export let sequelize: any;
+export let sequelize: any
 
 // Heroku specific
 if (config.dbURL) {
@@ -25,8 +23,6 @@ if (config.dbURL) {
   sequelize = new Sequelize(dbconfig.database, dbconfig.username, dbconfig.password, dbconfig)
 }
 
-sequelize.addModels([Author, Note, Revision, Temp, User]);
-
-
-export {Author, Note, Revision, Temp, User};
+sequelize.addModels([Author, Note, Revision, Temp, User])
 
+export { Author, Note, Revision, Temp, User }
diff --git a/lib/models/note.ts b/lib/models/note.ts
index 89fc2703f..a4f94076c 100644
--- a/lib/models/note.ts
+++ b/lib/models/note.ts
@@ -30,8 +30,8 @@ import moment from 'moment'
 // eslint-disable-next-line @typescript-eslint/camelcase
 import { diff_match_patch, patch_obj } from 'diff-match-patch'
 import S from 'string'
-import config from '../config'
-import logger from '../logger'
+import { config } from '../config'
+import { logger } from '../logger'
 import ot from '../ot'
 
 const md = markdownIt()
diff --git a/lib/models/revision.ts b/lib/models/revision.ts
index 76de7e0ff..e933bbaf8 100644
--- a/lib/models/revision.ts
+++ b/lib/models/revision.ts
@@ -4,13 +4,13 @@ import { Note } from './note'
 import { Utils } from '../utils'
 
 import Sequelize from 'sequelize'
+// core
+import { logger } from '../logger'
 import async = require('async');
 import moment = require('moment');
 import childProcess = require('child_process');
 import shortId = require('shortid');
 import path = require('path');
-// core
-import logger = require('../logger');
 
 const Op = Sequelize.Op
 
diff --git a/lib/models/user.ts b/lib/models/user.ts
index 69c2764cd..af827ba29 100644
--- a/lib/models/user.ts
+++ b/lib/models/user.ts
@@ -2,7 +2,7 @@ import { Note } from './note'
 import { Table, BeforeCreate, BeforeUpdate, HasMany, Unique, IsEmail, Column, DataType, PrimaryKey, Model, Default } from 'sequelize-typescript'
 import scrypt from 'scrypt-kdf'
 import { generateAvatarURL } from '../letter-avatars'
-import logger from '../logger'
+import { logger } from '../logger'
 import { UUIDV4 } from 'sequelize'
 
 // core
diff --git a/lib/realtime.ts b/lib/realtime.ts
index d4456eec2..b1469d352 100644
--- a/lib/realtime.ts
+++ b/lib/realtime.ts
@@ -2,8 +2,8 @@ import { Author, Note, Revision, User } from './models'
 
 import ot from './ot'
 import history from './history'
-import logger from './logger'
-import config from './config'
+import { logger } from './logger'
+import { config } from './config'
 import moment from 'moment'
 import randomcolor from 'randomcolor'
 import async from 'async'
@@ -26,10 +26,8 @@ const realtime: any = {
 }
 /* eslint-enable @typescript-eslint/no-use-before-define */
 
-
 const disconnectSocketQueue: any = []
 
-
 function onAuthorizeSuccess (data, accept) {
   accept()
 }
@@ -384,7 +382,6 @@ function failConnection (code, err, socket) {
   return socket.disconnect(true)
 }
 
-
 function interruptConnection (socket, noteId, socketId) {
   if (notes[noteId]) delete notes[noteId]
   if (users[socketId]) delete users[socketId]
@@ -537,7 +534,6 @@ function operationCallback (socket, operation) {
   })
 }
 
-
 function startConnection (socket) {
   if (isConnectionBusy) return
   isConnectionBusy = true
@@ -715,7 +711,6 @@ setInterval(function () {
   })
 }, 60000)
 
-
 function updateUserData (socket, user) {
   // retrieve user data from passport
   if (socket.request.user && socket.request.user.logged_in) {
@@ -731,7 +726,6 @@ function updateUserData (socket, user) {
   }
 }
 
-
 function connection (socket) {
   if (realtime.maintenance) return
   parseNoteIdFromSocket(socket, function (err, noteId) {
diff --git a/lib/response.js b/lib/response.js
index 2e944e32e..6de70623a 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -1,11 +1,13 @@
 'use strict'
 // response
 // external modules
+
+// core
+import { config } from './config'
+
 var fs = require('fs')
 var path = require('path')
 var request = require('request')
-// core
-var config = require('./config')
 var logger = require('./logger')
 var models = require('./models')
 const noteUtil = require('./web/note/util')
diff --git a/lib/web/note/actions.ts b/lib/web/note/actions.ts
index 30db0f507..92cdea690 100644
--- a/lib/web/note/actions.ts
+++ b/lib/web/note/actions.ts
@@ -1,8 +1,8 @@
 import { Response } from 'express'
 
 import { Note, Revision } from '../../models'
-import logger from '../../logger'
-import config from '../../config'
+import { logger } from '../../logger'
+import { config } from '../../config'
 import errors from '../../errors'
 import shortId from 'shortid'
 import moment from 'moment'
diff --git a/lib/web/note/controller.ts b/lib/web/note/controller.ts
index 3c29ce1ba..a44fd4ba8 100644
--- a/lib/web/note/controller.ts
+++ b/lib/web/note/controller.ts
@@ -1,9 +1,9 @@
-import { NextFunction, Response } from 'express'
+import { NextFunction, Request, Response } from 'express'
 import { NoteUtils } from './util'
 import * as ActionController from './actions'
 import errors from '../../errors'
-import config from '../../config'
-import logger from '../../logger'
+import { config } from '../../config'
+import { logger } from '../../logger'
 import { User, Note } from '../../models'
 
 export module NoteController {
diff --git a/lib/web/note/slide.ts b/lib/web/note/slide.ts
index 52c2d8af2..6c9aa64a1 100644
--- a/lib/web/note/slide.ts
+++ b/lib/web/note/slide.ts
@@ -1,8 +1,8 @@
 import { NextFunction, Response } from "express";
 import { NoteUtils } from "./util";
 import errors from '../../errors';
-import logger from '../../logger';
-import config from '../../config';
+import { logger } from '../../logger'
+import { config } from '../../config'
 import { User } from "../../models/user";
 import { Note } from "../../models/note";
 
diff --git a/lib/web/note/util.ts b/lib/web/note/util.ts
index 778c82d32..f35a26e9a 100644
--- a/lib/web/note/util.ts
+++ b/lib/web/note/util.ts
@@ -1,20 +1,19 @@
-import { Includeable } from "sequelize";
-import { Response } from "express";
+import { Includeable } from 'sequelize'
+import { Response } from 'express'
 
-import path from "path";
-import fs from "fs";
-import errors from "../../errors";
-import config from "../../config";
-import logger from "../../logger";
-import { Note } from "../../models/note";
-import { User } from "../../models/user";
+import path from 'path'
+import fs from 'fs'
+import errors from '../../errors'
+import { config } from '../../config'
+import { logger } from '../../logger'
+import { Note , User } from '../../models'
 
 export module NoteUtils {
   export function findNoteOrCreate(req, res, callback: (note: any) => void, include?: Includeable[]) {
-    const id = req.params.noteId || req.params.shortid;
+    const id = req.params.noteId || req.params.shortid
     Note.parseNoteId(id, function (err, _id) {
       if (err) {
-        logger.error(err);
+        logger.error(err)
         return errors.errorInternalError(res)
       }
       Note.findOne({
@@ -31,13 +30,13 @@ export module NoteUtils {
           return callback(note)
         }
       }).catch(function (err) {
-        logger.error(err);
+        logger.error(err)
         return errors.errorInternalError(res)
       })
     })
   }
 
-  export function checkViewPermission(req: any, note: any) {
+  export function checkViewPermission (req: any, note: any) {
     if (note.permission === 'private') {
       return req.isAuthenticated() && note.ownerId === req.user.id
     } else if (note.permission === 'limited' || note.permission === 'protected') {
@@ -47,9 +46,9 @@ export module NoteUtils {
     }
   }
 
-  export function newNote(req: any, res: Response, body: string | null) {
-    let owner = null;
-    const noteId = req.params.noteId ? req.params.noteId : null;
+  export function newNote (req: any, res: Response, body: string | null) {
+    let owner = null
+    const noteId = req.params.noteId ? req.params.noteId : null
     if (req.isAuthenticated()) {
       owner = req.user.id
     } else if (!config.allowAnonymous) {
@@ -67,21 +66,21 @@ export module NoteUtils {
     }).then(function (note) {
       return res.redirect(config.serverURL + '/' + (note.alias ? note.alias : Note.encodeNoteId(note.id)))
     }).catch(function (err) {
-      logger.error(err);
+      logger.error(err)
       return errors.errorInternalError(res)
     })
   }
 
-  export function getPublishData(req: any, res: Response, note: any, callback: (data: any) => void) {
-    const body = note.content;
-    const extracted = Note.extractMeta(body);
-    const markdown = extracted.markdown;
-    const meta = Note.parseMeta(extracted.meta);
-    const createtime = note.createdAt;
-    const updatetime = note.lastchangeAt;
-    let title = Note.decodeTitle(note.title);
-    title = Note.generateWebTitle(meta.title || title);
-    const ogdata = Note.parseOpengraph(meta, title);
+  export function getPublishData (req: any, res: Response, note: any, callback: (data: any) => void) {
+    const body = note.content
+    const extracted = Note.extractMeta(body)
+    const markdown = extracted.markdown
+    const meta = Note.parseMeta(extracted.meta)
+    const createtime = note.createdAt
+    const updatetime = note.lastchangeAt
+    let title = Note.decodeTitle(note.title)
+    title = Note.generateWebTitle(meta.title || title)
+    const ogdata = Note.parseOpengraph(meta, title)
     const data = {
       title: title,
       description: meta.description || (markdown ? Note.generateDescription(markdown) : null),
@@ -101,15 +100,14 @@ export module NoteUtils {
       cspNonce: res.locals.nonce,
       dnt: req.headers.dnt,
       opengraph: ogdata
-    };
+    }
     callback(data)
   }
 
-  function isRevealTheme(theme: string) {
+  function isRevealTheme (theme: string) {
     if (fs.existsSync(path.join(__dirname, '..', '..', '..', 'public', 'build', 'reveal.js', 'css', 'theme', theme + '.css'))) {
       return theme
     }
     return undefined
   }
 }
-
diff --git a/lib/web/statusRouter.js b/lib/web/statusRouter.js
index 025aafd41..1c6e8961c 100644
--- a/lib/web/statusRouter.js
+++ b/lib/web/statusRouter.js
@@ -1,10 +1,11 @@
 'use strict'
 
+import { config } from '../config'
+
 const Router = require('express').Router
 
 const errors = require('../errors')
 const realtime = require('../realtime')
-const config = require('../config')
 const models = require('../models')
 const logger = require('../logger')