feat: support new username system

packages/discord.js/src/structures/GuildMember.js

@@ -238,12 +238,12 @@ class GuildMember extends Base {
   }
 
   /**
-   * The nickname of this member, or their username if they don't have one
+   * The nickname of this member, or their user display name if they don't have one
    * @type {?string}
    * @readonly
    */
   get displayName() {
-    return this.nickname ?? this.user.username;
+    return this.nickname ?? this.user.displayName;
   }
 
   /**

packages/discord.js/src/structures/User.js

@@ -1,11 +1,15 @@
 'use strict';
 
+const process = require('node:process');
 const { userMention } = require('@discordjs/builders');
+const { calculateUserDefaultAvatarIndex } = require('@discordjs/rest');
 const { DiscordSnowflake } = require('@sapphire/snowflake');
 const Base = require('./Base');
 const TextBasedChannel = require('./interfaces/TextBasedChannel');
 const UserFlagsBitField = require('../util/UserFlagsBitField');
 
+let tagDeprecationEmitted = false;
+
 /**
  * Represents a user on Discord.
  * @implements {TextBasedChannel}
@@ -41,6 +45,16 @@ class User extends Base {
       this.username ??= null;
     }
 
+    if ('global_name' in data) {
+      /**
+       * The global name of this user
+       * @type {?string}
+       */
+      this.globalName = data.global_name;
+    } else {
+      this.globalName ??= null;
+    }
+
     if ('bot' in data) {
       /**
        * Whether or not the user is a bot
@@ -53,7 +67,8 @@ class User extends Base {
 
     if ('discriminator' in data) {
       /**
-       * A discriminator based on username for the user
+       * The discriminator of this user
+       * <info>`'0'`, or a 4-digit stringified number if they're using the legacy username system</info>
        * @type {?string}
        */
       this.discriminator = data.discriminator;
@@ -154,7 +169,8 @@ class User extends Base {
    * @readonly
    */
   get defaultAvatarURL() {
-    return this.client.rest.cdn.defaultAvatar(this.discriminator % 5);
+    const index = this.discriminator === '0' ? calculateUserDefaultAvatarIndex(this.id) : this.discriminator % 5;
+    return this.client.rest.cdn.defaultAvatar(index);
   }
 
   /**
@@ -188,12 +204,33 @@ class User extends Base {
   }
 
   /**
-   * The Discord "tag" (e.g. `hydrabolt#0001`) for this user
+   * The tag of this user
+   * <info>This user's username, or their legacy tag (e.g. `hydrabolt#0001`)
+   * if they're using the legacy username system</info>
    * @type {?string}
    * @readonly
+   * @deprecated Use {@link User#username} instead.
    */
   get tag() {
-    return typeof this.username === 'string' ? `${this.username}#${this.discriminator}` : null;
+    if (!tagDeprecationEmitted) {
+      process.emitWarning('User#tag is deprecated. Use User#username instead.', 'DeprecationWarning');
+      tagDeprecationEmitted = true;
+    }
+
+    return typeof this.username === 'string'
+      ? this.discriminator === '0'
+        ? this.username
+        : `${this.username}#${this.discriminator}`
+      : null;
+  }
+
+  /**
+   * The global name of this user, or their username if they don't have one
+   * @type {?string}
+   * @readonly
+   */
+  get displayName() {
+    return this.globalName ?? this.username;
   }
 
   /**

packages/discord.js/typings/index.d.ts

@@ -3060,13 +3060,16 @@ export class User extends PartialTextBasedChannel(Base) {
   public get createdAt(): Date;
   public get createdTimestamp(): number;
   public discriminator: string;
+  public get displayName(): string;
   public get defaultAvatarURL(): string;
   public get dmChannel(): DMChannel | null;
   public flags: Readonly<UserFlagsBitField> | null;
+  public globalName: string | null;
   public get hexAccentColor(): HexColorString | null | undefined;
   public id: Snowflake;
   public get partial(): false;
   public system: boolean;
+  /** @deprecated Use {@link User#username} instead. */
   public get tag(): string;
   public username: string;
   public avatarURL(options?: ImageURLOptions): string | null;

packages/rest/src/index.ts

@@ -5,7 +5,7 @@ export * from './lib/errors/RateLimitError.js';
 export * from './lib/RequestManager.js';
 export * from './lib/REST.js';
 export * from './lib/utils/constants.js';
-export { makeURLSearchParams, parseResponse } from './lib/utils/utils.js';
+export { calculateUserDefaultAvatarIndex, makeURLSearchParams, parseResponse } from './lib/utils/utils.js';
 
 /**
  * The {@link https://github.com/discordjs/discord.js/blob/main/packages/rest/#readme | @discordjs/rest} version

packages/rest/src/lib/CDN.ts

@@ -119,12 +119,15 @@ export class CDN {
 	}
 
 	/**
-	 * Generates the default avatar URL for a discriminator.
+	 * Generates a default avatar URL
 	 *
-	 * @param discriminator - The discriminator modulo 5
+	 * @param index - The default avatar index
+	 * @remarks
+	 * To calculate the index for a user do `(userId >> 22) % 6`,
+	 * or `discriminator % 5` if they're using the legacy username system.
 	 */
-	public defaultAvatar(discriminator: number): string {
-		return this.makeURL(`/embed/avatars/${discriminator}`, { extension: 'png' });
+	public defaultAvatar(index: number): string {
+		return this.makeURL(`/embed/avatars/${index}`, { extension: 'png' });
 	}
 
 	/**

packages/rest/src/lib/utils/utils.ts

@@ -1,5 +1,5 @@
 import { URLSearchParams } from 'node:url';
-import type { RESTPatchAPIChannelJSONBody } from 'discord-api-types/v10';
+import type { RESTPatchAPIChannelJSONBody, Snowflake } from 'discord-api-types/v10';
 import type { RateLimitData, ResponseLike } from '../REST.js';
 import { type RequestManager, RequestMethod } from '../RequestManager.js';
 import { RateLimitError } from '../errors/RateLimitError.js';
@@ -112,3 +112,12 @@ export async function onRateLimit(manager: RequestManager, rateLimitData: RateLi
 		throw new RateLimitError(rateLimitData);
 	}
 }
+
+/**
+ * Calculates the default avatar index for a given user id.
+ *
+ * @param userId - The user id to calculate the default avatar index for
+ */
+export function calculateUserDefaultAvatarIndex(userId: Snowflake) {
+	return Number(BigInt(userId) >> 22n) % 6;
+}