diff --git a/src/component/internal/api.ts b/src/component/internal/api.ts
index 9e97a48e..5275cf25 100644
--- a/src/component/internal/api.ts
+++ b/src/component/internal/api.ts
@@ -1,7 +1,7 @@
 import * as Api from '../api'
 
 export class NekoApi {
-  private _config = new Api.Configuration({
+  private readonly _config = new Api.Configuration({
     basePath: location.href.replace(/\/+$/, ''),
     baseOptions: { withCredentials: true },
   })
diff --git a/src/component/internal/connection.ts b/src/component/internal/connection.ts
index 8ef73810..97861b26 100644
--- a/src/component/internal/connection.ts
+++ b/src/component/internal/connection.ts
@@ -22,7 +22,6 @@ export interface NekoConnectionEvents {
 }
 
 export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
-  private _state: Connection
   private _open = false
 
   public websocket = new NekoWebSocket()
@@ -40,13 +39,15 @@ export class NekoConnection extends EventEmitter<NekoConnectionEvents> {
 
   private _webrtcCongestionControlHandle: (stats: WebRTCStats) => void
 
-  constructor(state: Connection) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _state: Connection,
+  ) {
     super()
 
-    this._state = state
     this._reconnector = {
-      websocket: new Reconnector(new WebsocketReconnector(state, this.websocket), state.websocket.config),
-      webrtc: new Reconnector(new WebrtcReconnector(state, this.websocket, this.webrtc), state.webrtc.config),
+      websocket: new Reconnector(new WebsocketReconnector(_state, this.websocket), _state.websocket.config),
+      webrtc: new Reconnector(new WebrtcReconnector(_state, this.websocket, this.webrtc), _state.webrtc.config),
     }
 
     this._onConnectHandle = () => {
diff --git a/src/component/internal/logger.ts b/src/component/internal/logger.ts
index c03f12ba..31c128cb 100644
--- a/src/component/internal/logger.ts
+++ b/src/component/internal/logger.ts
@@ -8,14 +8,14 @@ const FLUSH_TIMEOUT_MS = 250
 const RETRY_INTERVAL_MS = 2500
 
 export class NekoLoggerFactory {
-  private _ws: NekoWebSocket
   private _logs: message.SystemLog[] = []
   private _timeout: number | null = null
   private _interval: number | null = null
 
-  constructor(websocket: NekoWebSocket) {
-    this._ws = websocket
-  }
+  // eslint-disable-next-line
+  constructor(
+    private readonly _ws: NekoWebSocket,
+  ) {}
 
   private _flush() {
     if (this._logs.length > 0) {
diff --git a/src/component/internal/messages.ts b/src/component/internal/messages.ts
index 7c38f313..7d4d87ca 100644
--- a/src/component/internal/messages.ts
+++ b/src/component/internal/messages.ts
@@ -42,18 +42,18 @@ export interface NekoEvents {
 }
 
 export class NekoMessages extends EventEmitter<NekoEvents> {
-  private _connection: NekoConnection
-  private _state: NekoState
   private _localLog: Logger
   private _remoteLog: Logger
 
-  constructor(connection: NekoConnection, state: NekoState) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _connection: NekoConnection,
+    private readonly _state: NekoState,
+  ) {
     super()
 
-    this._connection = connection
-    this._state = state
     this._localLog = new Logger('messages')
-    this._remoteLog = connection.getLogger('messages')
+    this._remoteLog = _connection.getLogger('messages')
 
     this._connection.websocket.on('message', async (event: string, payload: any) => {
       // @ts-ignore
diff --git a/src/component/internal/reconnector/index.ts b/src/component/internal/reconnector/index.ts
index 6f8875c0..50310c56 100644
--- a/src/component/internal/reconnector/index.ts
+++ b/src/component/internal/reconnector/index.ts
@@ -31,7 +31,6 @@ export interface ReconnectorEvents {
 }
 
 export class Reconnector extends EventEmitter<ReconnectorEvents> {
-  private _conn: ReconnectorAbstract
   private _config: ReconnectorConfig
   private _timeout?: number
 
@@ -42,10 +41,13 @@ export class Reconnector extends EventEmitter<ReconnectorEvents> {
   private _onConnectHandle: () => void
   private _onDisconnectHandle: (error?: Error) => void
 
-  constructor(conn: ReconnectorAbstract, config?: ReconnectorConfig) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _conn: ReconnectorAbstract,
+    config?: ReconnectorConfig,
+  ) {
     super()
 
-    this._conn = conn
     this._config = {
       max_reconnects: 10,
       timeout_ms: 1500,
diff --git a/src/component/internal/reconnector/webrtc.ts b/src/component/internal/reconnector/webrtc.ts
index 12ad444b..587df0d4 100644
--- a/src/component/internal/reconnector/webrtc.ts
+++ b/src/component/internal/reconnector/webrtc.ts
@@ -7,20 +7,17 @@ import { NekoWebRTC } from '../webrtc'
 import { ReconnectorAbstract } from '.'
 
 export class WebrtcReconnector extends ReconnectorAbstract {
-  private _state: Connection
-  private _websocket: NekoWebSocket
-  private _webrtc: NekoWebRTC
-
   private _onConnectHandle: () => void
   private _onDisconnectHandle: (error?: Error) => void
 
-  constructor(state: Connection, websocket: NekoWebSocket, webrtc: NekoWebRTC) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _state: Connection,
+    private readonly _websocket: NekoWebSocket,
+    private readonly _webrtc: NekoWebRTC,
+  ) {
     super()
 
-    this._state = state
-    this._websocket = websocket
-    this._webrtc = webrtc
-
     this._onConnectHandle = () => this.emit('connect')
     this._webrtc.on('connected', this._onConnectHandle)
 
diff --git a/src/component/internal/reconnector/websocket.ts b/src/component/internal/reconnector/websocket.ts
index 378d2898..73970852 100644
--- a/src/component/internal/reconnector/websocket.ts
+++ b/src/component/internal/reconnector/websocket.ts
@@ -5,18 +5,16 @@ import { NekoWebSocket } from '../websocket'
 import { ReconnectorAbstract } from '.'
 
 export class WebsocketReconnector extends ReconnectorAbstract {
-  private _state: Connection
-  private _websocket: NekoWebSocket
-
   private _onConnectHandle: () => void
   private _onDisconnectHandle: (error?: Error) => void
 
-  constructor(state: Connection, websocket: NekoWebSocket) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _state: Connection,
+    private readonly _websocket: NekoWebSocket,
+  ) {
     super()
 
-    this._state = state
-    this._websocket = websocket
-
     this._onConnectHandle = () => this.emit('connect')
     this._websocket.on('connected', this._onConnectHandle)
 
diff --git a/src/component/internal/webrtc.ts b/src/component/internal/webrtc.ts
index 2a76b969..c477890f 100644
--- a/src/component/internal/webrtc.ts
+++ b/src/component/internal/webrtc.ts
@@ -33,13 +33,13 @@ export class NekoWebRTC extends EventEmitter<NekoWebRTCEvents> {
   private _track?: MediaStreamTrack
   private _state: RTCIceConnectionState = 'disconnected'
   private _candidates: RTCIceCandidateInit[] = []
-  private _log: Logger
   private _statsStop?: () => void
 
-  constructor(logger?: Logger) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _log: Logger = new Logger('webrtc'),
+  ) {
     super()
-
-    this._log = logger || new Logger('webrtc')
   }
 
   get supported() {
diff --git a/src/component/internal/websocket.ts b/src/component/internal/websocket.ts
index c54cb108..181cd8bd 100644
--- a/src/component/internal/websocket.ts
+++ b/src/component/internal/websocket.ts
@@ -10,12 +10,12 @@ export interface NekoWebSocketEvents {
 
 export class NekoWebSocket extends EventEmitter<NekoWebSocketEvents> {
   private _ws?: WebSocket
-  private _log: Logger
 
-  constructor(logger?: Logger) {
+  // eslint-disable-next-line
+  constructor(
+    private readonly _log: Logger = new Logger('websocket'),
+  ) {
     super()
-
-    this._log = logger || new Logger('websocket')
   }
 
   get supported() {
diff --git a/src/component/utils/logger.ts b/src/component/utils/logger.ts
index d1869d7a..54c54df4 100644
--- a/src/component/utils/logger.ts
+++ b/src/component/utils/logger.ts
@@ -1,11 +1,8 @@
 export class Logger {
-  protected _scope: string = 'main'
-
-  constructor(scope?: string) {
-    if (scope) {
-      this._scope = scope
-    }
-  }
+  // eslint-disable-next-line
+  constructor(
+    protected readonly _scope: string = 'main',
+  ) {}
 
   protected _console(level: string, m: string, fields?: Record<string, any>) {
     let t = ''