diff --git a/components/handler.js b/components/handler.js
index f0d17fc..ef1d4c4 100644
--- a/components/handler.js
+++ b/components/handler.js
@@ -551,14 +551,14 @@ class Handler {
     if (args.length < minArgs) args = args.concat(this.version.minecraftArguments ? this.version.minecraftArguments.split(' ') : this.version.arguments.game)
 
     this.options.authorization = await Promise.resolve(this.options.authorization)
-
+    this.options.authorization.meta = this.options.authorization.meta ? this.options.authorization.meta : { type: 'mojang' }
     const fields = {
       '${auth_access_token}': this.options.authorization.access_token,
       '${auth_session}': this.options.authorization.access_token,
       '${auth_player_name}': this.options.authorization.name,
       '${auth_uuid}': this.options.authorization.uuid,
       '${user_properties}': this.options.authorization.user_properties,
-      '${user_type}': 'mojang',
+      '${user_type}': this.options.authorization.meta.type,
       '${version_name}': this.options.version.number,
       '${assets_index_name}': this.version.assetIndex.id,
       '${game_directory}': this.options.overrides.gameDirectory || this.options.root,
@@ -567,6 +567,10 @@ class Handler {
       '${version_type}': this.options.version.type
     }
 
+    if (this.options.authorization.meta.demo) {
+      args.push('--demo')
+    }
+
     for (let index = 0; index < args.length; index++) {
       if (typeof args[index] === 'object') args.splice(index, 2)
       if (Object.keys(fields).includes(args[index])) {
diff --git a/index.d.ts b/index.d.ts
index bb5391e..19c55cc 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -143,12 +143,18 @@ declare module "minecraft-launcher-core" {
     authorization: Promise<IUser>;
   }
 
+
+
   interface IUser {
     access_token: string;
     client_token: string;
     uuid: string;
     name: string;
     user_properties: Partial<any>;
+    meta?: {
+      type: "mojang" | "msa",
+      demo?: boolean
+    };
   }
 
   interface IProfile {