diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..5b6a7cf
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,110 @@
+/// <reference types="node" />
+
+declare module "minecraft-launcher-core" {
+    type OS = "windows" | "osx" | "linux";
+    type Type = "release" | "snapshot";
+  
+    interface IOverrides {
+      minArgs?: number;
+      minecraftJar?: string;
+      versionJson?: string;
+      directory?: string;
+      natives?: string;
+      assetRoot?: string;
+      libraryRoot?: string;
+      cwd?: string;
+      detached?: boolean;
+      classes?: Array<string>;
+      maxSockets?: number;
+      url?: {
+        meta?: string;
+        resources?: string;
+        mavenForge?: string;
+        defaultRepoForge?: string;
+        fallbackMaven?: string;
+      };
+    }
+  
+    interface ILauncherOptions {
+      clientPackage?: string;
+      removePackage?: boolean;
+      installed?: string;
+      root: string;
+      os?: OS;
+      customLaunchArgs?: Array<string>;
+      customArgs?: Array<string>;
+      version: {
+        number: string;
+        type: Type;
+        custom?: string;
+      };
+      memory: {
+        max: string;
+        min: string;
+      };
+      forge?: string;
+      javaPath?: string;
+      server?: {
+        host: string;
+        port: string;
+      };
+      proxy?: {
+        host: string;
+        port: string;
+        username?: string;
+        password?: string;
+      };
+      timeout?: number;
+      window?: {
+        width?: number;
+        height?: number;
+      };
+      overrides?: IOverrides;
+      authorization: Promise<IUser>;
+    }
+  
+    interface IUser {
+      access_token: string;
+      client_token: string;
+      uuid: string;
+      name: string;
+      user_properties: Partial<any>;
+    }
+  
+    interface IProfile {
+      id: number;
+      name: string;
+    }
+  
+    interface IAuthenticator {
+      getAuth(username: string, password?: string): Promise<IUser>;
+      validate(
+        access_token: string,
+        client_token: string
+      ): Promise<boolean | Partial<any>>;
+      refreshAuth(
+        access_token: string,
+        client_token: string,
+        selectedProfile: IProfile
+      ): Promise<IUser>;
+      invalidate(
+        access_token: string,
+        client_token: string
+      ): Promise<boolean | Partial<any>>;
+      signOut(
+        username: string,
+        password: string
+      ): Promise<boolean | Partial<any>>;
+      changeApiUrl(url: string): void;
+    }
+  
+    import { EventEmitter } from 'events'
+    import { ChildProcessWithoutNullStreams } from 'child_process'
+  
+    export class Client extends EventEmitter {
+      launch(options: ILauncherOptions): ChildProcessWithoutNullStreams | null;
+    }
+  
+    export const Authenticator: IAuthenticator;
+  }
+  
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 93917b9..fd2a9e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -36,6 +36,12 @@
       "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
       "dev": true
     },
+    "@types/node": {
+      "version": "14.0.27",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.0.27.tgz",
+      "integrity": "sha512-kVrqXhbclHNHGu9ztnAwSncIgJv/FaxmzXJvGXNdcCpV1b8u1/Mi6z6m0vwy0LzKeXFTPLH0NzwmoJ3fNCIq0g==",
+      "dev": true
+    },
     "acorn": {
       "version": "7.1.1",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
diff --git a/package.json b/package.json
index 633d877..a218825 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "uuid": "^3.3.2"
   },
   "devDependencies": {
+    "@types/node": "^14.0.27",
     "eslint": "^6.8.0",
     "eslint-config-standard": "^14.1.1",
     "eslint-plugin-import": "^2.20.2",