feat(WelcomeScreen): welcome screens (#5490)

Co-authored-by: Jan <66554238+vaporox@users.noreply.github.com>
Co-authored-by: izexi <43889168+izexi@users.noreply.github.com>
Co-authored-by: SpaceEEC <spaceeec@yahoo.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/structures/AnonymousGuild.js

@@ -0,0 +1,78 @@
+'use strict';
+
+const BaseGuild = require('./BaseGuild');
+const { VerificationLevels, NSFWLevels } = require('../util/Constants');
+
+/**
+ * Bundles common attributes and methods between {@link Guild} and {@link InviteGuild}
+ * @abstract
+ */
+class AnonymousGuild extends BaseGuild {
+  constructor(client, data) {
+    super(client, data);
+    this._patch(data);
+  }
+
+  _patch(data) {
+    this.features = data.features;
+    /**
+     * The hash of the guild invite splash image
+     * @type {?string}
+     */
+    this.splash = data.splash;
+
+    /**
+     * The hash of the guild banner
+     * @type {?string}
+     */
+    this.banner = data.banner;
+
+    /**
+     * The description of the guild, if any
+     * @type {?string}
+     */
+    this.description = data.description;
+
+    /**
+     * The verification level of the guild
+     * @type {VerificationLevel}
+     */
+    this.verificationLevel = VerificationLevels[data.verification_level];
+
+    /**
+     * The vanity invite code of the guild, if any
+     * @type {?string}
+     */
+    this.vanityURLCode = data.vanity_url_code;
+
+    if ('nsfw_level' in data) {
+      /**
+       * The NSFW level of this guild
+       * @type {NSFWLevel}
+       */
+      this.nsfwLevel = NSFWLevels[data.nsfw_level];
+    }
+  }
+
+  /**
+   * The URL to this guild's banner.
+   * @param {ImageURLOptions} [options={}] Options for the Image URL
+   * @returns {?string}
+   */
+  bannerURL({ format, size } = {}) {
+    if (!this.banner) return null;
+    return this.client.rest.cdn.Banner(this.id, this.banner, format, size);
+  }
+
+  /**
+   * The URL to this guild's invite splash image.
+   * @param {ImageURLOptions} [options={}] Options for the Image URL
+   * @returns {?string}
+   */
+  splashURL({ format, size } = {}) {
+    if (!this.splash) return null;
+    return this.client.rest.cdn.Splash(this.id, this.splash, format, size);
+  }
+}
+
+module.exports = AnonymousGuild;