diff --git a/lib/broadcast-operator.ts b/lib/broadcast-operator.ts
index 015382d8ab..ca140b98d6 100644
--- a/lib/broadcast-operator.ts
+++ b/lib/broadcast-operator.ts
@@ -2,8 +2,15 @@ import type { BroadcastFlags, Room, SocketId } from "socket.io-adapter";
 import { Handshake, RESERVED_EVENTS, Socket } from "./socket";
 import { PacketType } from "socket.io-parser";
 import type { Adapter } from "socket.io-adapter";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  TypedEventBroadcaster,
+} from "./typed-events";
 
-export class BroadcastOperator {
+export class BroadcastOperator<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents> {
   constructor(
     private readonly adapter: Adapter,
     private readonly rooms: Set<Room> = new Set<Room>(),
@@ -18,7 +25,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public to(room: Room | Room[]): BroadcastOperator {
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     const rooms = new Set(this.rooms);
     if (Array.isArray(room)) {
       room.forEach((r) => rooms.add(r));
@@ -40,7 +47,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public in(room: Room | Room[]): BroadcastOperator {
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.to(room);
   }
 
@@ -51,7 +58,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public except(room: Room | Room[]): BroadcastOperator {
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     const exceptRooms = new Set(this.exceptRooms);
     if (Array.isArray(room)) {
       room.forEach((r) => exceptRooms.add(r));
@@ -73,7 +80,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public compress(compress: boolean): BroadcastOperator {
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
     const flags = Object.assign({}, this.flags, { compress });
     return new BroadcastOperator(
       this.adapter,
@@ -91,7 +98,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public get volatile(): BroadcastOperator {
+  public get volatile(): BroadcastOperator<EmitEvents> {
     const flags = Object.assign({}, this.flags, { volatile: true });
     return new BroadcastOperator(
       this.adapter,
@@ -107,7 +114,7 @@ export class BroadcastOperator {
    * @return a new BroadcastOperator instance
    * @public
    */
-  public get local(): BroadcastOperator {
+  public get local(): BroadcastOperator<EmitEvents> {
     const flags = Object.assign({}, this.flags, { local: true });
     return new BroadcastOperator(
       this.adapter,
@@ -123,18 +130,21 @@ export class BroadcastOperator {
    * @return Always true
    * @public
    */
-  public emit(ev: string | Symbol, ...args: any[]): true {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): true {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
     // set up packet object
-    args.unshift(ev);
+    const data = [ev, ...args];
     const packet = {
       type: PacketType.EVENT,
-      data: args,
+      data: data,
     };
 
-    if ("function" == typeof args[args.length - 1]) {
+    if ("function" == typeof data[data.length - 1]) {
       throw new Error("Callbacks are not supported when broadcasting");
     }
 
@@ -166,7 +176,7 @@ export class BroadcastOperator {
    *
    * @public
    */
-  public fetchSockets(): Promise<RemoteSocket[]> {
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
     return this.adapter
       .fetchSockets({
         rooms: this.rooms,
@@ -176,7 +186,7 @@ export class BroadcastOperator {
         return sockets.map((socket) => {
           if (socket instanceof Socket) {
             // FIXME the TypeScript compiler complains about missing private properties
-            return (socket as unknown) as RemoteSocket;
+            return (socket as unknown) as RemoteSocket<EmitEvents>;
           } else {
             return new RemoteSocket(this.adapter, socket as SocketDetails);
           }
@@ -246,13 +256,14 @@ interface SocketDetails {
 /**
  * Expose of subset of the attributes and methods of the Socket class
  */
-export class RemoteSocket {
+export class RemoteSocket<EmitEvents extends EventsMap>
+  implements TypedEventBroadcaster<EmitEvents> {
   public readonly id: SocketId;
   public readonly handshake: Handshake;
   public readonly rooms: Set<Room>;
   public readonly data: any;
 
-  private readonly operator: BroadcastOperator;
+  private readonly operator: BroadcastOperator<EmitEvents>;
 
   constructor(adapter: Adapter, details: SocketDetails) {
     this.id = details.id;
@@ -262,7 +273,10 @@ export class RemoteSocket {
     this.operator = new BroadcastOperator(adapter, new Set([this.id]));
   }
 
-  public emit(ev: string, ...args: any[]): boolean {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): true {
     return this.operator.emit(ev, ...args);
   }
 
diff --git a/lib/client.ts b/lib/client.ts
index 13c9ec5362..06aeee248d 100644
--- a/lib/client.ts
+++ b/lib/client.ts
@@ -3,20 +3,24 @@ import debugModule = require("debug");
 import url = require("url");
 import type { IncomingMessage } from "http";
 import type { Namespace, Server } from "./index";
+import type { EventsMap } from "./typed-events";
 import type { Socket } from "./socket";
 import type { SocketId } from "socket.io-adapter";
 
 const debug = debugModule("socket.io:client");
 
-export class Client {
+export class Client<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap
+> {
   public readonly conn;
 
   private readonly id: string;
-  private readonly server: Server;
+  private readonly server: Server<ListenEvents, EmitEvents>;
   private readonly encoder: Encoder;
   private readonly decoder: Decoder;
-  private sockets: Map<SocketId, Socket> = new Map();
-  private nsps: Map<string, Socket> = new Map();
+  private sockets: Map<SocketId, Socket<ListenEvents, EmitEvents>> = new Map();
+  private nsps: Map<string, Socket<ListenEvents, EmitEvents>> = new Map();
   private connectTimeout?: NodeJS.Timeout;
 
   /**
@@ -26,7 +30,7 @@ export class Client {
    * @param conn
    * @package
    */
-  constructor(server: Server, conn: Socket) {
+  constructor(server: Server<ListenEvents, EmitEvents>, conn: any) {
     this.server = server;
     this.conn = conn;
     this.encoder = server.encoder;
@@ -87,7 +91,7 @@ export class Client {
     this.server._checkNamespace(
       name,
       auth,
-      (dynamicNspName: Namespace | false) => {
+      (dynamicNspName: Namespace<ListenEvents, EmitEvents> | false) => {
         if (dynamicNspName) {
           debug("dynamic namespace %s was created", dynamicNspName);
           this.doConnect(name, auth);
@@ -145,7 +149,7 @@ export class Client {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents>): void {
     if (this.sockets.has(socket.id)) {
       const nsp = this.sockets.get(socket.id)!.nsp.name;
       this.sockets.delete(socket.id);
diff --git a/lib/index.ts b/lib/index.ts
index 8884cf9ffd..b3350abc92 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -7,7 +7,11 @@ import path = require("path");
 import engine = require("engine.io");
 import { Client } from "./client";
 import { EventEmitter } from "events";
-import { ExtendedError, Namespace } from "./namespace";
+import {
+  ExtendedError,
+  Namespace,
+  NamespaceReservedEventsMap,
+} from "./namespace";
 import { ParentNamespace } from "./parent-namespace";
 import { Adapter, Room, SocketId } from "socket.io-adapter";
 import * as parser from "socket.io-parser";
@@ -17,6 +21,12 @@ import { Socket } from "./socket";
 import type { CookieSerializeOptions } from "cookie";
 import type { CorsOptions } from "cors";
 import type { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
+import {
+  EventsMap,
+  DefaultEventsMap,
+  EventParams,
+  StrictEventEmitter,
+} from "./typed-events";
 
 const debug = debugModule("socket.io:server");
 
@@ -156,8 +166,15 @@ interface ServerOptions extends EngineAttachOptions {
   connectTimeout: number;
 }
 
-export class Server extends EventEmitter {
-  public readonly sockets: Namespace;
+export class Server<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends StrictEventEmitter<
+  {},
+  EmitEvents,
+  NamespaceReservedEventsMap<ListenEvents, EmitEvents>
+> {
+  public readonly sockets: Namespace<ListenEvents, EmitEvents>;
 
   /** @private */
   readonly _parser: typeof parser;
@@ -167,8 +184,11 @@ export class Server extends EventEmitter {
   /**
    * @private
    */
-  _nsps: Map<string, Namespace> = new Map();
-  private parentNsps: Map<ParentNspNameMatchFn, ParentNamespace> = new Map();
+  _nsps: Map<string, Namespace<ListenEvents, EmitEvents>> = new Map();
+  private parentNsps: Map<
+    ParentNspNameMatchFn,
+    ParentNamespace<ListenEvents, EmitEvents>
+  > = new Map();
   private _adapter?: typeof Adapter;
   private _serveClient: boolean;
   private opts: Partial<EngineOptions>;
@@ -248,7 +268,7 @@ export class Server extends EventEmitter {
   _checkNamespace(
     name: string,
     auth: { [key: string]: any },
-    fn: (nsp: Namespace | false) => void
+    fn: (nsp: Namespace<ListenEvents, EmitEvents> | false) => void
   ): void {
     if (this.parentNsps.size === 0) return fn(false);
 
@@ -557,8 +577,8 @@ export class Server extends EventEmitter {
    */
   public of(
     name: string | RegExp | ParentNspNameMatchFn,
-    fn?: (socket: Socket) => void
-  ): Namespace {
+    fn?: (socket: Socket<ListenEvents, EmitEvents>) => void
+  ): Namespace<ListenEvents, EmitEvents> {
     if (typeof name === "function" || name instanceof RegExp) {
       const parentNsp = new ParentNamespace(this);
       debug("initializing parent namespace %s", parentNsp.name);
@@ -616,7 +636,10 @@ export class Server extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this.sockets.use(fn);
     return this;
@@ -629,7 +652,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public to(room: Room | Room[]): BroadcastOperator {
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.sockets.to(room);
   }
 
@@ -640,7 +663,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public in(room: Room | Room[]): BroadcastOperator {
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.sockets.in(room);
   }
 
@@ -651,7 +674,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public except(name: Room | Room[]): Server {
+  public except(name: Room | Room[]): Server<ListenEvents, EmitEvents> {
     this.sockets.except(name);
     return this;
   }
@@ -662,7 +685,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
@@ -673,7 +696,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.sockets.emit("message", ...args);
     return this;
   }
@@ -694,7 +717,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): BroadcastOperator {
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
     return this.sockets.compress(compress);
   }
 
@@ -706,7 +729,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): BroadcastOperator {
+  public get volatile(): BroadcastOperator<EmitEvents> {
     return this.sockets.volatile;
   }
 
@@ -716,7 +739,7 @@ export class Server extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): BroadcastOperator {
+  public get local(): BroadcastOperator<EmitEvents> {
     return this.sockets.local;
   }
 
@@ -725,7 +748,7 @@ export class Server extends EventEmitter {
    *
    * @public
    */
-  public fetchSockets(): Promise<RemoteSocket[]> {
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
     return this.sockets.fetchSockets();
   }
 
diff --git a/lib/namespace.ts b/lib/namespace.ts
index 65417742a5..909ec3e2dd 100644
--- a/lib/namespace.ts
+++ b/lib/namespace.ts
@@ -1,7 +1,13 @@
 import { Socket } from "./socket";
 import type { Server } from "./index";
+import {
+  EventParams,
+  EventNames,
+  EventsMap,
+  StrictEventEmitter,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { Client } from "./client";
-import { EventEmitter } from "events";
 import debugModule from "debug";
 import type { Adapter, Room, SocketId } from "socket.io-adapter";
 import { BroadcastOperator, RemoteSocket } from "./broadcast-operator";
@@ -12,18 +18,39 @@ export interface ExtendedError extends Error {
   data?: any;
 }
 
-export class Namespace extends EventEmitter {
+export interface NamespaceReservedEventsMap<
+  ListenEvents extends EventsMap,
+  EmitEvents extends EventsMap
+> {
+  connect: (socket: Socket<ListenEvents, EmitEvents>) => void;
+  connection: (socket: Socket<ListenEvents, EmitEvents>) => void;
+}
+
+export class Namespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends StrictEventEmitter<
+  {},
+  EmitEvents,
+  NamespaceReservedEventsMap<ListenEvents, EmitEvents>
+> {
   public readonly name: string;
-  public readonly sockets: Map<SocketId, Socket> = new Map();
+  public readonly sockets: Map<
+    SocketId,
+    Socket<ListenEvents, EmitEvents>
+  > = new Map();
 
   public adapter: Adapter;
 
   /** @private */
-  readonly server: Server;
+  readonly server: Server<ListenEvents, EmitEvents>;
 
   /** @private */
   _fns: Array<
-    (socket: Socket, next: (err?: ExtendedError) => void) => void
+    (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   > = [];
 
   /** @private */
@@ -35,7 +62,7 @@ export class Namespace extends EventEmitter {
    * @param server instance
    * @param name
    */
-  constructor(server: Server, name: string) {
+  constructor(server: Server<ListenEvents, EmitEvents>, name: string) {
     super();
     this.server = server;
     this.name = name;
@@ -60,7 +87,10 @@ export class Namespace extends EventEmitter {
    * @public
    */
   public use(
-    fn: (socket: Socket, next: (err?: ExtendedError) => void) => void
+    fn: (
+      socket: Socket<ListenEvents, EmitEvents>,
+      next: (err?: ExtendedError) => void
+    ) => void
   ): this {
     this._fns.push(fn);
     return this;
@@ -73,7 +103,10 @@ export class Namespace extends EventEmitter {
    * @param fn - last fn call in the middleware
    * @private
    */
-  private run(socket: Socket, fn: (err: ExtendedError | null) => void) {
+  private run(
+    socket: Socket<ListenEvents, EmitEvents>,
+    fn: (err: ExtendedError | null) => void
+  ) {
     const fns = this._fns.slice(0);
     if (!fns.length) return fn(null);
 
@@ -100,7 +133,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public to(room: Room | Room[]): BroadcastOperator {
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).to(room);
   }
 
@@ -111,7 +144,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public in(room: Room | Room[]): BroadcastOperator {
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).in(room);
   }
 
@@ -122,7 +155,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public except(room: Room | Room[]): BroadcastOperator {
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).except(room);
   }
 
@@ -132,7 +165,11 @@ export class Namespace extends EventEmitter {
    * @return {Socket}
    * @private
    */
-  _add(client: Client, query, fn?: () => void): Socket {
+  _add(
+    client: Client<ListenEvents, EmitEvents>,
+    query,
+    fn?: () => void
+  ): Socket<ListenEvents, EmitEvents> {
     debug("adding socket to nsp %s", this.name);
     const socket = new Socket(this, client, query);
     this.run(socket, (err) => {
@@ -160,8 +197,8 @@ export class Namespace extends EventEmitter {
           if (fn) fn();
 
           // fire user-set events
-          super.emit("connect", socket);
-          super.emit("connection", socket);
+          this.emitReserved("connect", socket);
+          this.emitReserved("connection", socket);
         } else {
           debug("next called after client was closed - ignoring socket");
         }
@@ -175,7 +212,7 @@ export class Namespace extends EventEmitter {
    *
    * @private
    */
-  _remove(socket: Socket): void {
+  _remove(socket: Socket<ListenEvents, EmitEvents>): void {
     if (this.sockets.has(socket.id)) {
       this.sockets.delete(socket.id);
     } else {
@@ -189,8 +226,11 @@ export class Namespace extends EventEmitter {
    * @return Always true
    * @public
    */
-  public emit(ev: string | Symbol, ...args: any[]): true {
-    return new BroadcastOperator(this.adapter).emit(ev, ...args);
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): true {
+    return new BroadcastOperator<EmitEvents>(this.adapter).emit(ev, ...args);
   }
 
   /**
@@ -199,7 +239,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -210,7 +250,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -232,7 +272,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public compress(compress: boolean): BroadcastOperator {
+  public compress(compress: boolean): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).compress(compress);
   }
 
@@ -244,7 +284,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get volatile(): BroadcastOperator {
+  public get volatile(): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).volatile;
   }
 
@@ -254,7 +294,7 @@ export class Namespace extends EventEmitter {
    * @return self
    * @public
    */
-  public get local(): BroadcastOperator {
+  public get local(): BroadcastOperator<EmitEvents> {
     return new BroadcastOperator(this.adapter).local;
   }
 
@@ -263,7 +303,7 @@ export class Namespace extends EventEmitter {
    *
    * @public
    */
-  public fetchSockets(): Promise<RemoteSocket[]> {
+  public fetchSockets(): Promise<RemoteSocket<EmitEvents>[]> {
     return new BroadcastOperator(this.adapter).fetchSockets();
   }
 
diff --git a/lib/parent-namespace.ts b/lib/parent-namespace.ts
index 6af019e63c..e7f64188cd 100644
--- a/lib/parent-namespace.ts
+++ b/lib/parent-namespace.ts
@@ -1,12 +1,21 @@
 import { Namespace } from "./namespace";
 import type { Server } from "./index";
+import type {
+  EventParams,
+  EventNames,
+  EventsMap,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { BroadcastOptions } from "socket.io-adapter";
 
-export class ParentNamespace extends Namespace {
+export class ParentNamespace<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends Namespace<ListenEvents, EmitEvents> {
   private static count: number = 0;
-  private children: Set<Namespace> = new Set();
+  private children: Set<Namespace<ListenEvents, EmitEvents>> = new Set();
 
-  constructor(server: Server) {
+  constructor(server: Server<ListenEvents, EmitEvents>) {
     super(server, "/_" + ParentNamespace.count++);
   }
 
@@ -23,7 +32,10 @@ export class ParentNamespace extends Namespace {
     this.adapter = { broadcast };
   }
 
-  public emit(ev: string | Symbol, ...args: [...any]): true {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): true {
     this.children.forEach((nsp) => {
       nsp.emit(ev, ...args);
     });
@@ -31,14 +43,14 @@ export class ParentNamespace extends Namespace {
     return true;
   }
 
-  createChild(name: string): Namespace {
+  createChild(name: string): Namespace<ListenEvents, EmitEvents> {
     const namespace = new Namespace(this.server, name);
     namespace._fns = this._fns.slice(0);
     this.listeners("connect").forEach((listener) =>
-      namespace.on("connect", listener as (...args: any[]) => void)
+      namespace.on("connect", listener)
     );
     this.listeners("connection").forEach((listener) =>
-      namespace.on("connection", listener as (...args: any[]) => void)
+      namespace.on("connection", listener)
     );
     this.children.add(namespace);
     this.server._nsps.set(name, namespace);
diff --git a/lib/socket.ts b/lib/socket.ts
index 4bae605e47..912274ccc8 100644
--- a/lib/socket.ts
+++ b/lib/socket.ts
@@ -1,10 +1,16 @@
-import { EventEmitter } from "events";
 import { Packet, PacketType } from "socket.io-parser";
 import url = require("url");
 import debugModule from "debug";
 import type { Server } from "./index";
+import {
+  EventParams,
+  EventNames,
+  EventsMap,
+  StrictEventEmitter,
+  DefaultEventsMap,
+} from "./typed-events";
 import type { Client } from "./client";
-import type { Namespace } from "./namespace";
+import type { Namespace, NamespaceReservedEventsMap } from "./namespace";
 import type { IncomingMessage, IncomingHttpHeaders } from "http";
 import type {
   Adapter,
@@ -18,15 +24,39 @@ import { BroadcastOperator } from "./broadcast-operator";
 
 const debug = debugModule("socket.io:socket");
 
-export const RESERVED_EVENTS = new Set(<const>[
+type ClientReservedEvents = "connect_error";
+
+export interface SocketReservedEventsMap {
+  disconnect: (reason: string) => void;
+  disconnecting: (reason: string) => void;
+  error: (err: Error) => void;
+}
+
+// EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
+export interface EventEmitterReservedEventsMap {
+  newListener: (
+    eventName: string | Symbol,
+    listener: (...args: any[]) => void
+  ) => void;
+  removeListener: (
+    eventName: string | Symbol,
+    listener: (...args: any[]) => void
+  ) => void;
+}
+
+export const RESERVED_EVENTS: ReadonlySet<string | Symbol> = new Set<
+  | ClientReservedEvents
+  | keyof NamespaceReservedEventsMap<never, never>
+  | keyof SocketReservedEventsMap
+  | keyof EventEmitterReservedEventsMap
+>(<const>[
   "connect",
   "connect_error",
   "disconnect",
   "disconnecting",
-  // EventEmitter reserved events: https://nodejs.org/api/events.html#events_event_newlistener
   "newListener",
   "removeListener",
-]) as ReadonlySet<string | Symbol>;
+]);
 
 /**
  * The handshake details
@@ -78,7 +108,14 @@ export interface Handshake {
   auth: { [key: string]: any };
 }
 
-export class Socket extends EventEmitter {
+export class Socket<
+  ListenEvents extends EventsMap = DefaultEventsMap,
+  EmitEvents extends EventsMap = ListenEvents
+> extends StrictEventEmitter<
+  ListenEvents,
+  EmitEvents,
+  SocketReservedEventsMap
+> {
   public readonly id: SocketId;
   public readonly handshake: Handshake;
   /**
@@ -89,11 +126,11 @@ export class Socket extends EventEmitter {
   public connected: boolean;
   public disconnected: boolean;
 
-  private readonly server: Server;
+  private readonly server: Server<ListenEvents, EmitEvents>;
   private readonly adapter: Adapter;
   private acks: Map<number, () => void> = new Map();
   private fns: Array<
-    (event: Array<any>, next: (err: Error) => void) => void
+    (event: Array<any>, next: (err?: Error) => void) => void
   > = [];
   private flags: BroadcastFlags = {};
   private _anyListeners?: Array<(...args: any[]) => void>;
@@ -106,7 +143,11 @@ export class Socket extends EventEmitter {
    * @param {Object} auth
    * @package
    */
-  constructor(readonly nsp: Namespace, readonly client: Client, auth: object) {
+  constructor(
+    readonly nsp: Namespace<ListenEvents, EmitEvents>,
+    readonly client: Client<ListenEvents, EmitEvents>,
+    auth: object
+  ) {
     super();
     this.server = nsp.server;
     this.adapter = this.nsp.adapter;
@@ -147,20 +188,23 @@ export class Socket extends EventEmitter {
    * @return Always returns `true`.
    * @public
    */
-  public emit(ev: string, ...args: any[]): boolean {
+  public emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
     if (RESERVED_EVENTS.has(ev)) {
       throw new Error(`"${ev}" is a reserved event name`);
     }
-    args.unshift(ev);
+    const data: any[] = [ev, ...args];
     const packet: any = {
       type: PacketType.EVENT,
-      data: args,
+      data: data,
     };
 
     // access last argument to see if it's an ACK callback
-    if (typeof args[args.length - 1] === "function") {
+    if (typeof data[data.length - 1] === "function") {
       debug("emitting packet with ack id %d", this.nsp._ids);
-      this.acks.set(this.nsp._ids, args.pop());
+      this.acks.set(this.nsp._ids, data.pop());
       packet.id = this.nsp._ids++;
     }
 
@@ -179,7 +223,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public to(room: Room | Room[]): BroadcastOperator {
+  public to(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.newBroadcastOperator().to(room);
   }
 
@@ -190,7 +234,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public in(room: Room | Room[]): BroadcastOperator {
+  public in(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.newBroadcastOperator().in(room);
   }
 
@@ -201,7 +245,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public except(room: Room | Room[]): BroadcastOperator {
+  public except(room: Room | Room[]): BroadcastOperator<EmitEvents> {
     return this.newBroadcastOperator().except(room);
   }
 
@@ -211,7 +255,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public send(...args: readonly any[]): this {
+  public send(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -222,7 +266,7 @@ export class Socket extends EventEmitter {
    * @return self
    * @public
    */
-  public write(...args: readonly any[]): this {
+  public write(...args: EventParams<EmitEvents, "message">): this {
     this.emit("message", ...args);
     return this;
   }
@@ -413,9 +457,9 @@ export class Socket extends EventEmitter {
    *
    * @private
    */
-  _onerror(err): void {
+  _onerror(err: Error): void {
     if (this.listeners("error").length) {
-      super.emit("error", err);
+      this.emitReserved("error", err);
     } else {
       console.error("Missing error handler on `socket`.");
       console.error(err.stack);
@@ -433,13 +477,13 @@ export class Socket extends EventEmitter {
   _onclose(reason: string): this | undefined {
     if (!this.connected) return this;
     debug("closing socket - reason %s", reason);
-    super.emit("disconnecting", reason);
+    this.emitReserved("disconnecting", reason);
     this.leaveAll();
     this.nsp._remove(this);
     this.client._remove(this);
     this.connected = false;
     this.disconnected = true;
-    super.emit("disconnect", reason);
+    this.emitReserved("disconnect", reason);
     return;
   }
 
@@ -505,7 +549,7 @@ export class Socket extends EventEmitter {
    * @return {Socket} self
    * @public
    */
-  public get broadcast(): BroadcastOperator {
+  public get broadcast(): BroadcastOperator<EmitEvents> {
     return this.newBroadcastOperator();
   }
 
@@ -515,7 +559,7 @@ export class Socket extends EventEmitter {
    * @return {Socket} self
    * @public
    */
-  public get local(): BroadcastOperator {
+  public get local(): BroadcastOperator<EmitEvents> {
     return this.newBroadcastOperator().local;
   }
 
@@ -533,7 +577,7 @@ export class Socket extends EventEmitter {
           return this._onerror(err);
         }
         if (this.connected) {
-          super.emit.apply(this, event);
+          super.emitUntyped.apply(this, event);
         } else {
           debug("ignore packet received after disconnection");
         }
@@ -549,7 +593,7 @@ export class Socket extends EventEmitter {
    * @public
    */
   public use(
-    fn: (event: Array<any>, next: (err: Error) => void) => void
+    fn: (event: Array<any>, next: (err?: Error) => void) => void
   ): this {
     this.fns.push(fn);
     return this;
@@ -670,7 +714,7 @@ export class Socket extends EventEmitter {
     return this._anyListeners || [];
   }
 
-  private newBroadcastOperator(): BroadcastOperator {
+  private newBroadcastOperator(): BroadcastOperator<EmitEvents> {
     const flags = Object.assign({}, this.flags);
     this.flags = {};
     return new BroadcastOperator(
diff --git a/lib/typed-events.ts b/lib/typed-events.ts
new file mode 100644
index 0000000000..1d44ae2a3b
--- /dev/null
+++ b/lib/typed-events.ts
@@ -0,0 +1,167 @@
+import { EventEmitter } from "events";
+
+/**
+ * An events map is an interface that maps event names to their value, which
+ * represents the type of the `on` listener.
+ */
+export interface EventsMap {
+  [event: string]: any;
+}
+
+/**
+ * The default events map, used if no EventsMap is given. Using this EventsMap
+ * is equivalent to accepting all event names, and any data.
+ */
+export interface DefaultEventsMap {
+  [event: string]: (...args: any[]) => void;
+}
+
+/**
+ * Returns a union type containing all the keys of an event map.
+ */
+export type EventNames<Map extends EventsMap> = keyof Map & (string | symbol);
+
+/** The tuple type representing the parameters of an event listener */
+export type EventParams<
+  Map extends EventsMap,
+  Ev extends EventNames<Map>
+> = Parameters<Map[Ev]>;
+
+/**
+ * The event names that are either in ReservedEvents or in UserEvents
+ */
+export type ReservedOrUserEventNames<
+  ReservedEventsMap extends EventsMap,
+  UserEvents extends EventsMap
+> = EventNames<ReservedEventsMap> | EventNames<UserEvents>;
+
+/**
+ * Type of a listener of a user event or a reserved event. If `Ev` is in
+ * `ReservedEvents`, the reserved event listener is returned.
+ */
+export type ReservedOrUserListener<
+  ReservedEvents extends EventsMap,
+  UserEvents extends EventsMap,
+  Ev extends ReservedOrUserEventNames<ReservedEvents, UserEvents>
+> = Ev extends EventNames<ReservedEvents>
+  ? ReservedEvents[Ev]
+  : Ev extends EventNames<UserEvents>
+  ? UserEvents[Ev]
+  : never;
+
+/**
+ * Interface for classes that aren't `EventEmitter`s, but still expose a
+ * strictly typed `emit` method.
+ */
+export interface TypedEventBroadcaster<EmitEvents extends EventsMap> {
+  emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean;
+}
+
+/**
+ * Strictly typed version of an `EventEmitter`. A `TypedEventEmitter` takes type
+ * parameters for mappings of event names to event data types, and strictly
+ * types method calls to the `EventEmitter` according to these event maps.
+ *
+ * @typeParam ListenEvents - `EventsMap` of user-defined events that can be
+ * listened to with `on` or `once`
+ * @typeParam EmitEvents - `EventsMap` of user-defined events that can be
+ * emitted with `emit`
+ * @typeParam ReservedEvents - `EventsMap` of reserved events, that can be
+ * emitted by socket.io with `emitReserved`, and can be listened to with
+ * `listen`.
+ */
+export abstract class StrictEventEmitter<
+    ListenEvents extends EventsMap,
+    EmitEvents extends EventsMap,
+    ReservedEvents extends EventsMap = {}
+  >
+  extends EventEmitter
+  implements TypedEventBroadcaster<EmitEvents> {
+  /**
+   * Adds the `listener` function as an event listener for `ev`.
+   *
+   * @param ev Name of the event
+   * @param listener Callback function
+   */
+  on<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    ev: Ev,
+    listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+  ): this {
+    return super.on(ev, listener);
+  }
+
+  /**
+   * Adds a one-time `listener` function as an event listener for `ev`.
+   *
+   * @param ev Name of the event
+   * @param listener Callback function
+   */
+  once<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    ev: Ev,
+    listener: ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>
+  ): this {
+    return super.once(ev, listener);
+  }
+
+  /**
+   * Emits an event.
+   *
+   * @param ev Name of the event
+   * @param args Values to send to listeners of this event
+   */
+  emit<Ev extends EventNames<EmitEvents>>(
+    ev: Ev,
+    ...args: EventParams<EmitEvents, Ev>
+  ): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Emits a reserved event.
+   *
+   * This method is `protected`, so that only a class extending
+   * `StrictEventEmitter` can emit its own reserved events.
+   *
+   * @param ev Reserved event name
+   * @param args Arguments to emit along with the event
+   */
+  protected emitReserved<Ev extends EventNames<ReservedEvents>>(
+    ev: Ev,
+    ...args: EventParams<ReservedEvents, Ev>
+  ): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Emits an event.
+   *
+   * This method is `protected`, so that only a class extending
+   * `StrictEventEmitter` can get around the strict typing. This is useful for
+   * calling `emit.apply`, which can be called as `emitUntyped.apply`.
+   *
+   * @param ev Event name
+   * @param args Arguments to emit along with the event
+   */
+  protected emitUntyped(ev: string, ...args: any[]): boolean {
+    return super.emit(ev, ...args);
+  }
+
+  /**
+   * Returns the listeners listening to an event.
+   *
+   * @param event Event name
+   * @returns Array of listeners subscribed to `event`
+   */
+  listeners<Ev extends ReservedOrUserEventNames<ReservedEvents, ListenEvents>>(
+    event: Ev
+  ): ReservedOrUserListener<ReservedEvents, ListenEvents, Ev>[] {
+    return super.listeners(event) as ReservedOrUserListener<
+      ReservedEvents,
+      ListenEvents,
+      Ev
+    >[];
+  }
+}
diff --git a/package-lock.json b/package-lock.json
index bcda3028d5..4140bcf9db 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -350,6 +350,47 @@
       "integrity": "sha512-tsAQNx32a8CoFhjhijUIhI4kccIAgmGhy8LZMZgGfmXcpMbPRUqn5LWmgRttILi6yeGmBJd2xsPkFMs0PzgPCw==",
       "dev": true
     },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.4.tgz",
+      "integrity": "sha512-33g3pMJk3bg5nXbL/+CY6I2eJDzZAni49PfJnL5fghPTggPvBd/pFNSgJsdAgWptuFu7qq/ERvOYFlhvsLTCKA==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.stat": "2.0.4",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.4.tgz",
+      "integrity": "sha512-IYlHJA0clt2+Vg7bccq+TzRdJvv19c2INqBSsoOLp1je7xjtr7J26+WXR72MCdvU9q1qTzIWDfhMf+DRvQJK4Q==",
+      "dev": true
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.6",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.6.tgz",
+      "integrity": "sha512-8Broas6vTtW4GIXTAHDoE32hnN2M5ykgCpWGbuXHQ15vEMqr23pB76e/GZcYsZCHALv50ktd24qhEyKr6wBtow==",
+      "dev": true,
+      "requires": {
+        "@nodelib/fs.scandir": "2.1.4",
+        "fastq": "^1.6.0"
+      }
+    },
+    "@sindresorhus/is": {
+      "version": "0.14.0",
+      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
+      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ==",
+      "dev": true
+    },
+    "@szmarczak/http-timer": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
+      "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
+      "dev": true,
+      "requires": {
+        "defer-to-connect": "^1.0.1"
+      }
+    },
     "@types/body-parser": {
       "version": "1.19.0",
       "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.19.0.tgz",
@@ -411,6 +452,12 @@
       "resolved": "https://registry.npmjs.org/@types/mime/-/mime-2.0.3.tgz",
       "integrity": "sha512-Jus9s4CDbqwocc5pOAnh8ShfrnMcPHuJYzVcSUU7lrh8Ni5HuIqX3oilL86p3dlTrk0LzHRCgA/GQ7uNCw6l2Q=="
     },
+    "@types/minimist": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@types/minimist/-/minimist-1.2.1.tgz",
+      "integrity": "sha512-fZQQafSREFyuZcdWFAExYjBiCL7AUCdgsk80iO0q4yihYYdcIiH28CcuPTGFgLOCC8RlW49GSQxdHwZP+I7CNg==",
+      "dev": true
+    },
     "@types/mocha": {
       "version": "8.0.4",
       "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.0.4.tgz",
@@ -422,6 +469,12 @@
       "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.10.tgz",
       "integrity": "sha512-J32dgx2hw8vXrSbu4ZlVhn1Nm3GbeCFNw2FWL8S5QKucHGY0cyNwjdQdO+KMBZ4wpmC7KhLCiNsdk1RFRIYUQQ=="
     },
+    "@types/normalize-package-data": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/@types/normalize-package-data/-/normalize-package-data-2.4.0.tgz",
+      "integrity": "sha512-f5j5b/Gf71L+dbqxIpQ4Z2WlmI/mPJ0fOkGGmFgtb6sAu97EPczzbS3/tJKxmcYDj55OX6ssqwDAWOHIYDRDGA==",
+      "dev": true
+    },
     "@types/qs": {
       "version": "6.9.5",
       "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.5.tgz",
@@ -490,12 +543,38 @@
         "uri-js": "^4.2.2"
       }
     },
+    "ansi-align": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.0.tgz",
+      "integrity": "sha512-ZpClVKqXN3RGBmKibdfWzqCY4lnjEuoNzU5T0oEFpfd/z5qJHVarukridD4juLO2FXMiwUQxr9WqQtaYa8XRYw==",
+      "dev": true,
+      "requires": {
+        "string-width": "^3.0.0"
+      }
+    },
     "ansi-colors": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
       "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
       "dev": true
     },
+    "ansi-escapes": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
+      "integrity": "sha512-JWF7ocqNrp8u9oqpgV+wH5ftbt+cfvv+PTjOvKLT3AdYly/LmORARfEVT1iyjwN+4MqE5UmVKoAdIBqeoCHgLA==",
+      "dev": true,
+      "requires": {
+        "type-fest": "^0.11.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.11.0.tgz",
+          "integrity": "sha512-OdjXJxnCN1AvyLSzeKIgXTXxV+99ZuXl3Hpo9XpJAv9MBcHrrJOQ5kV7ypXOuQie+AmWG25hLbiKdwYTifzcfQ==",
+          "dev": true
+        }
+      }
+    },
     "ansi-regex": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.0.tgz",
@@ -541,12 +620,24 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==",
+      "dev": true
+    },
     "arraybuffer.slice": {
       "version": "0.0.7",
       "resolved": "https://registry.npmjs.org/arraybuffer.slice/-/arraybuffer.slice-0.0.7.tgz",
       "integrity": "sha512-wGUIVQXuehL5TCqQun8OW81jGzAWycqzFF8lFp+GOM5BXLYj3bKNsYC4daB7n6XjCqxQA/qgTJ+8ANR3acjrog==",
       "dev": true
     },
+    "arrify": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
+      "dev": true
+    },
     "astral-regex": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
@@ -602,6 +693,96 @@
       "integrity": "sha512-gaqbzQPqOoamawKg0LGVd7SzLgXS+JH61oWprSLH+P+abTczqJbhTR8CmJ2u9/bUYNmHTGJx/UEmn6doAvvuig==",
       "dev": true
     },
+    "boxen": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/boxen/-/boxen-4.2.0.tgz",
+      "integrity": "sha512-eB4uT9RGzg2odpER62bBwSLvUeGC+WbRjjyyFhGsKnc8wp/m0+hQsMUvUe3H2V0D5vw0nBdO1hCJoZo5mKeuIQ==",
+      "dev": true,
+      "requires": {
+        "ansi-align": "^3.0.0",
+        "camelcase": "^5.3.1",
+        "chalk": "^3.0.0",
+        "cli-boxes": "^2.2.0",
+        "string-width": "^4.1.0",
+        "term-size": "^2.1.0",
+        "type-fest": "^0.8.1",
+        "widest-line": "^3.1.0"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+          "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+          "dev": true,
+          "requires": {
+            "color-convert": "^2.0.1"
+          }
+        },
+        "chalk": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-3.0.0.tgz",
+          "integrity": "sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
+          }
+        },
+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+          "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+          "dev": true,
+          "requires": {
+            "color-name": "~1.1.4"
+          }
+        },
+        "color-name": {
+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
+        },
+        "emoji-regex": {
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@@ -2522,6 +3641,33 @@
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@@ -2534,6 +3680,12 @@
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+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
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+      "dev": true,
+      "requires": {
+        "is-number": "^7.0.0"
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+    "trim-newlines": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/trim-newlines/-/trim-newlines-3.0.0.tgz",
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@@ -2584,6 +3757,20 @@
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+    "tsd": {
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+      "resolved": "https://registry.npmjs.org/tsd/-/tsd-0.14.0.tgz",
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+      "dev": true,
+      "requires": {
+        "eslint-formatter-pretty": "^4.0.0",
+        "globby": "^11.0.1",
+        "meow": "^7.0.1",
+        "path-exists": "^4.0.0",
+        "read-pkg-up": "^7.0.0",
+        "update-notifier": "^4.1.0"
+      }
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       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
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+    "unique-string": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-2.0.0.tgz",
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+      "dev": true,
+      "requires": {
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+    "update-notifier": {
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+      "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-4.1.3.tgz",
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+      "requires": {
+        "boxen": "^4.2.0",
+        "chalk": "^3.0.0",
+        "configstore": "^5.0.1",
+        "has-yarn": "^2.1.0",
+        "import-lazy": "^2.1.0",
+        "is-ci": "^2.0.0",
+        "is-installed-globally": "^0.3.1",
+        "is-npm": "^4.0.0",
+        "is-yarn-global": "^0.3.0",
+        "latest-version": "^5.0.0",
+        "pupa": "^2.0.1",
+        "semver-diff": "^3.1.1",
+        "xdg-basedir": "^4.0.0"
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+          "dev": true,
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+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-3.0.0.tgz",
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+          "dev": true,
+          "requires": {
+            "ansi-styles": "^4.1.0",
+            "supports-color": "^7.1.0"
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+        "color-convert": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
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+          "dev": true,
+          "requires": {
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+          "version": "1.1.4",
+          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+          "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+          "dev": true
+        },
+        "has-flag": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-4.0.0.tgz",
+          "integrity": "sha512-EykJT/Q1KjTWctppgIAgfSO0tKVuZUjhgMr17kqTumMl6Afv3EISleU7qZUzoXDFTAHTDC4NOoG/ZxU3EvlMPQ==",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "7.2.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+          "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+          "dev": true,
+          "requires": {
+            "has-flag": "^4.0.0"
+          }
+        }
+      }
+    },
     "uri-js": {
       "version": "4.4.0",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.0.tgz",
@@ -2623,6 +3891,15 @@
         "punycode": "^2.1.0"
       }
     },
+    "url-parse-lax": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-3.0.0.tgz",
+      "integrity": "sha1-FrXK/Afb42dsGxmZF3gj1lA6yww=",
+      "dev": true,
+      "requires": {
+        "prepend-http": "^2.0.0"
+      }
+    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -2641,6 +3918,16 @@
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       "dev": true
     },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -2661,6 +3948,40 @@
       "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=",
       "dev": true
     },
+    "widest-line": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/widest-line/-/widest-line-3.1.0.tgz",
+      "integrity": "sha512-NsmoXalsWVDMGupxZ5R08ka9flZjjiLvHVAWYOKtiKM8ujtZWr9cRffak+uSE48+Ob8ObalXpwyeUiyDD6QFgg==",
+      "dev": true,
+      "requires": {
+        "string-width": "^4.0.0"
+      },
+      "dependencies": {
+        "emoji-regex": {
+          "version": "8.0.0",
+          "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+          "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-3.0.0.tgz",
+          "integrity": "sha512-zymm5+u+sCsSWyD9qNaejV3DFvhCKclKdizYaJUuHA83RLjb7nSuGnddCHGv0hk+KY7BMAlsWeK4Ueg6EV6XQg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "4.2.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.2.tgz",
+          "integrity": "sha512-XBJbT3N4JhVumXE0eoLU9DCjcaF92KLNqTmFCnG1pf8duUxFGwtP6AD6nkjw9a3IdiRtL3E2w3JDiE/xi3vOeA==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^8.0.0",
+            "is-fullwidth-code-point": "^3.0.0",
+            "strip-ansi": "^6.0.0"
+          }
+        }
+      }
+    },
     "word-wrap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
@@ -2759,6 +4080,12 @@
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     },
+    "xdg-basedir": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-4.0.0.tgz",
+      "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q==",
+      "dev": true
+    },
     "xmlhttprequest-ssl": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/xmlhttprequest-ssl/-/xmlhttprequest-ssl-1.5.5.tgz",
diff --git a/package.json b/package.json
index 74950613c5..a350cd78b0 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,9 @@
   },
   "scripts": {
     "compile": "rimraf ./dist && tsc",
-    "test": "npm run format:check && npm run compile && nyc mocha --require ts-node/register --reporter spec --slow 200 --bail --timeout 10000 test/socket.io.ts",
+    "test": "npm run format:check && npm run compile && npm run test:types && npm run test:unit",
+    "test:types": "tsd",
+    "test:unit": "nyc mocha --require ts-node/register --reporter spec --slow 200 --bail --timeout 10000 test/socket.io.ts",
     "format:check": "prettier --check \"lib/**/*.ts\" \"test/**/*.ts\"",
     "format:fix": "prettier --write \"lib/**/*.ts\" \"test/**/*.ts\"",
     "prepack": "npm run compile"
@@ -68,6 +70,7 @@
     "superagent": "^6.1.0",
     "supertest": "^6.0.1",
     "ts-node": "^9.0.0",
+    "tsd": "^0.14.0",
     "typescript": "^4.1.2"
   },
   "contributors": [
@@ -90,5 +93,8 @@
   ],
   "engines": {
     "node": ">=10.0.0"
+  },
+  "tsd": {
+    "directory": "test"
   }
 }
diff --git a/test/socket.io.test-d.ts b/test/socket.io.test-d.ts
new file mode 100644
index 0000000000..7014ad521f
--- /dev/null
+++ b/test/socket.io.test-d.ts
@@ -0,0 +1,200 @@
+"use strict";
+import { Server, Socket } from "..";
+import type { DefaultEventsMap } from "../lib/typed-events";
+import { createServer } from "http";
+import { expectError, expectType } from "tsd";
+
+// This file is run by tsd, not mocha.
+
+describe("server", () => {
+  describe("no event map", () => {
+    describe("on", () => {
+      it("infers correct types for listener parameters of reserved events", (done) => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(s);
+            s.on("disconnect", (reason) => {
+              expectType<string>(reason);
+            });
+            s.on("disconnecting", (reason) => {
+              expectType<string>(reason);
+            });
+          });
+          sio.on("connect", (s) => {
+            expectType<Socket<DefaultEventsMap, DefaultEventsMap>>(s);
+          });
+          done();
+        });
+      });
+
+      it("infers 'any' for listener parameters of other events", (done) => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.on("random", (a, b, c) => {
+              expectType<any>(a);
+              expectType<any>(b);
+              expectType<any>(c);
+              done();
+            });
+            s.emit("random", 1, "2", [3]);
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts any parameters", () => {
+        const srv = createServer();
+        const sio = new Server(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("random", 1, "2", [3]);
+            s.emit("no parameters");
+          });
+        });
+      });
+    });
+  });
+
+  describe("single event map", () => {
+    interface BidirectionalEvents {
+      random: (a: number, b: string, c: number[]) => void;
+    }
+
+    describe("on", () => {
+      it("infers correct types for listener parameters", (done) => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        expectType<Server<BidirectionalEvents, BidirectionalEvents>>(sio);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<BidirectionalEvents, BidirectionalEvents>>(s);
+            s.on("random", (a, b, c) => {
+              expectType<number>(a);
+              expectType<string>(b);
+              expectType<number[]>(c);
+              done();
+            });
+          });
+        });
+      });
+
+      it("does not accept arguments of wrong types", (done) => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        expectError(sio.on("random", (a, b, c) => {}));
+        srv.listen(() => {
+          expectError(sio.on("wrong name", (s) => {}));
+          sio.on("connection", (s) => {
+            s.on("random", (a, b, c) => {});
+            expectError(s.on("random"));
+            expectError(s.on("random", (a, b, c, d) => {}));
+            expectError(s.on(2, 3));
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts arguments of the correct types", () => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("random", 1, "2", [3]);
+          });
+        });
+      });
+
+      it("does not accept arguments of the wrong types", () => {
+        const srv = createServer();
+        const sio = new Server<BidirectionalEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(s.emit("noParameter", 2));
+            expectError(s.emit("oneParameter"));
+            expectError(s.emit("random"));
+            expectError(s.emit("oneParameter", 2, 3));
+            expectError(s.emit("random", (a, b, c) => {}));
+            expectError(s.emit("wrong name", () => {}));
+            expectError(s.emit("complicated name with spaces", 2));
+          });
+        });
+      });
+    });
+  });
+
+  describe("listen and emit event maps", () => {
+    interface ClientToServerEvents {
+      helloFromClient: (message: string) => void;
+    }
+
+    interface ServerToClientEvents {
+      helloFromServer: (message: string, x: number) => void;
+    }
+
+    describe("on", () => {
+      it("infers correct types for listener parameters", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        expectType<Server<ClientToServerEvents, ServerToClientEvents>>(sio);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectType<Socket<ClientToServerEvents, ServerToClientEvents>>(s);
+            s.on("helloFromClient", (message) => {
+              expectType<string>(message);
+              done();
+            });
+          });
+        });
+      });
+
+      it("does not accept emit events", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(
+              s.on("helloFromServer", (message, number) => {
+                done();
+              })
+            );
+          });
+        });
+      });
+    });
+
+    describe("emit", () => {
+      it("accepts arguments of the correct types", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            s.emit("helloFromServer", "hi", 10);
+            done();
+          });
+        });
+      });
+
+      it("does not accept arguments of wrong types", (done) => {
+        const srv = createServer();
+        const sio = new Server<ClientToServerEvents, ServerToClientEvents>(srv);
+        srv.listen(() => {
+          sio.on("connection", (s) => {
+            expectError(s.emit("helloFromClient", "hi"));
+            expectError(s.emit("helloFromServer", "hi", 10, "10"));
+            expectError(s.emit("helloFromServer", "hi", "10"));
+            expectError(s.emit("helloFromServer", 0, 0));
+            expectError(s.emit("wrong name", 10));
+            expectError(s.emit("wrong name"));
+            done();
+          });
+        });
+      });
+    });
+  });
+});
diff --git a/test/socket.io.ts b/test/socket.io.ts
index cf8b647874..0733feee81 100644
--- a/test/socket.io.ts
+++ b/test/socket.io.ts
@@ -9,14 +9,14 @@ import request from "supertest";
 import expect from "expect.js";
 import type { AddressInfo } from "net";
 import * as io_v2 from "socket.io-client-v2";
-
-const ioc = require("socket.io-client");
+import type { SocketId } from "socket.io-adapter";
+import { io as ioc, Socket as ClientSocket } from "socket.io-client";
 
 import "./support/util";
 import "./utility-methods";
 
 // Creates a socket.io client for the given server
-function client(srv, nsp?: string | object, opts?: object) {
+function client(srv, nsp?: string | object, opts?: object): ClientSocket {
   if ("object" == typeof nsp) {
     opts = nsp;
     nsp = undefined;
@@ -333,7 +333,9 @@ describe("socket.io", () => {
       const net = require("net");
       const server = net.createServer();
 
-      const clientSocket = ioc("ws://0.0.0.0:" + PORT, { reconnection: false });
+      const clientSocket = ioc("ws://0.0.0.0:" + PORT, {
+        reconnection: false,
+      });
 
       clientSocket.on("disconnect", () => {
         expect(Object.keys(sio._nsps["/"].sockets).length).to.equal(0);
@@ -605,7 +607,7 @@ describe("socket.io", () => {
       const srv = createServer();
       const sio = new Server(srv);
       const chatSids: string[] = [];
-      let otherSid = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -632,9 +634,9 @@ describe("socket.io", () => {
     it("should find all clients in a namespace room", (done) => {
       const srv = createServer();
       const sio = new Server(srv);
-      let chatFooSid = null;
-      let chatBarSid = null;
-      let otherSid = null;
+      let chatFooSid: SocketId | null = null;
+      let chatBarSid: SocketId | null = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -671,9 +673,9 @@ describe("socket.io", () => {
     it("should find all clients across namespace rooms", (done) => {
       const srv = createServer();
       const sio = new Server(srv);
-      let chatFooSid = null;
-      let chatBarSid = null;
-      let otherSid = null;
+      let chatFooSid: SocketId | null = null;
+      let chatBarSid: SocketId | null = null;
+      let otherSid: SocketId | null = null;
       srv.listen(() => {
         const c1 = client(srv, "/chat");
         const c2 = client(srv, "/chat", { forceNew: true });
@@ -953,7 +955,7 @@ describe("socket.io", () => {
       srv.listen(() => {
         const clientSocket = client(srv, { reconnection: false });
         clientSocket.on("connect", function init() {
-          clientSocket.removeListener("connect", init);
+          clientSocket.off("connect", init);
           clientSocket.io.engine.close();
 
           clientSocket.connect();
@@ -1042,7 +1044,7 @@ describe("socket.io", () => {
               done();
             });
           });
-          s.client.ondata(null);
+          (s as any).client.ondata(null);
         });
       });
     });
@@ -2230,7 +2232,7 @@ describe("socket.io", () => {
           expect(s.rooms).to.contain(s.id, "a", "b", "c");
           s.leave("b");
           expect(s.rooms).to.contain(s.id, "a", "c");
-          s.leaveAll();
+          (s as any).leaveAll();
           expect(s.rooms.size).to.eql(0);
           done();
         });
@@ -2266,7 +2268,7 @@ describe("socket.io", () => {
           expect(s.rooms).to.contain(s.id, "a", "b");
           s.leave("unknown");
           expect(s.rooms).to.contain(s.id, "a", "b");
-          s.leaveAll();
+          (s as any).leaveAll();
           expect(s.rooms.size).to.eql(0);
           done();
         });
@@ -2469,7 +2471,7 @@ describe("socket.io", () => {
       srv.listen(() => {
         const socket = client(srv);
         sio.on("connection", (socket) => {
-          expect(socket.name).to.be("guillermo");
+          expect((socket as any).name).to.be("guillermo");
           done();
         });
       });