feat(GuildChannel): add setNSFW method

Backported from commit: 0fc9459450
PR: #2050

src/client/rest/RESTMethods.js

@@ -335,6 +335,7 @@ class RESTMethods {
     const data = {};
     data.name = (_data.name || channel.name).trim();
     data.topic = typeof _data.topic === 'undefined' ? channel.topic : _data.topic;
+    data.nsfw = typeof _data.nsfw === 'undefined' ? channel.nsfw : _data.nsfw;
     data.position = _data.position || channel.position;
     data.bitrate = _data.bitrate || (channel.bitrate ? channel.bitrate * 1000 : undefined);
     data.user_limit = typeof _data.userLimit !== 'undefined' ? _data.userLimit : channel.userLimit;

src/structures/GuildChannel.js

@@ -212,6 +212,7 @@ class GuildChannel extends Channel {
    * @property {string} [name] The name of the channel
    * @property {number} [position] The position of the channel
    * @property {string} [topic] The topic of the text channel
+   * @property {boolean} [nsfw] Whether the channel is NSFW
    * @property {number} [bitrate] The bitrate of the voice channel
    * @property {number} [userLimit] The user limit of the channel
    */

src/structures/TextChannel.js

@@ -62,6 +62,16 @@ class TextChannel extends GuildChannel {
     return this.client.rest.methods.getChannelWebhooks(this);
   }
 
+  /**
+   * Sets whether this channel is flagged as NSFW.
+   * @param {boolean} nsfw Whether the channel should be considered NSFW
+   * @param {string} [reason] Reason for changing the channel's NSFW flag
+   * @returns {Promise<TextChannel>}
+   */
+  setNSFW(nsfw, reason) {
+    return this.edit({ nsfw }, reason);
+  }
+
   /**
    * Create a webhook for the channel.
    * @param {string} name The name of the webhook