feat(GuildMember): v13 add flags

src/util/GuildMemberFlags.js

@@ -0,0 +1,43 @@
+'use strict';
+
+const BitField = require('./BitField');
+
+/**
+ * Data structure that makes it easy to interact with an {@link GuildMember#flags} bitfield.
+ * @extends {BitField}
+ */
+class GuildMemberFlags extends BitField {}
+
+/**
+ * @name GuildMemberFlags
+ * @kind constructor
+ * @memberof GuildMemberFlags
+ * @param {BitFieldResolvable} [bits=0] Bit(s) to read from
+ */
+
+/**
+ * Numeric guild member flags. All available properties:
+ * * `DID_REJOIN`
+ * * `COMPLETED_ONBOARDING`
+ * * `BYPASSES_VERIFICATION`
+ * * `STARTED_ONBOARDING`
+ * @type {Object}
+ * @see {@link https://discord.com/developers/docs/resources/guild#guild-member-object-guild-member-flags}
+ */
+GuildMemberFlags.FLAGS = {
+  DID_REJOIN: 1 << 0,
+  COMPLETED_ONBOARDING: 1 << 1,
+  BYPASSES_VERIFICATION: 1 << 2,
+  STARTED_ONBOARDING: 1 << 3,
+};
+
+/**
+ * Data that can be resolved to give a guild member flag bitfield. This can be:
+ * * A string (see {@link GuildMemberFlags.FLAGS})
+ * * A guild member flag
+ * * An instance of GuildMemberFlags
+ * * An Array of GuildMemberFlagsResolvable
+ * @typedef {string|number|GuildMemberFlags|GuildMemberFlagsResolvable[]} GuildMemberFlagsResolvable
+ */
+
+module.exports = GuildMemberFlags;