feat(Attachment): add flags (discordjs#9686)

Co-authored-by: Almeida <almeidx@pm.me>

src/util/AttachmentFlags.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const BitField = require('./BitField');
+
+/**
+ * Data structure that makes it easy to interact with an {@link GuildMember#flags} bitfield.
+ * @extends {BitField}
+ */
+class AttachmentFlags extends BitField {}
+
+/**
+ * @name AttachmentFlags
+ * @kind constructor
+ * @memberof AttachmentFlags
+ * @param {BitFieldResolvable} [bits=0] Bit(s) to read from
+ */
+
+/**
+ * Numeric guild member flags. All available properties:
+ * * `IS_REMIX`
+ * @type {Object}
+ * @see {@link https://discord.com/developers/docs/resources/channel#attachment-object-attachment-structure-attachment-flags}
+ */
+AttachmentFlags.FLAGS = {
+  IS_REMIX: 1 << 2,
+};
+
+/**
+ * Data that can be resolved to give a guild attachment bitfield. This can be:
+ * * A string (see {@link AttachmentFlags.FLAGS})
+ * * A attachment flag
+ * * An instance of AttachmentFlags
+ * * An Array of AttachmentFlagsResolvable
+ * @typedef {string|number|AttachmentFlags|AttachmentFlagsResolvable[]} AttachmentFlagsResolvable
+ */
+
+module.exports = AttachmentFlags;

typings/index.d.ts

@@ -1714,6 +1714,7 @@ export class MessageAttachment {
   public description: string | null;
   public duration: number | null;
   public ephemeral: boolean;
+  public flags: Readonly<AttachmentFlags>;
   public height: number | null;
   public id: Snowflake;
   public name: string | null;
@@ -1730,6 +1731,14 @@ export class MessageAttachment {
   public toJSON(): unknown;
 }
 
+export class AttachmentFlags extends BitField<AttachmentFlagsString> {
+  public static FLAGS: Record<AttachmentFlagsString, number>;
+  public static resolve(bit?: BitFieldResolvable<AttachmentFlagsString, number>): number;
+}
+
+export type AttachmentFlagsString =
+  | 'IS_REMIX';
+
 export class MessageButton extends BaseMessageComponent {
   public constructor(data?: MessageButton | MessageButtonOptions | APIButtonComponent);
   public customId: string | null;