feat: Adds nsfwOnly plugin (#12)

* Add files via upload

* Update nsfwOnly.ts

* feat(TS): Adds Channel Only Plugin

* Delete channelOnly.ts

* fix: fixed discussed changes.

TypeScript/nsfwOnly.ts

@@ -0,0 +1,61 @@
+/**
+ * @author: @NeoYaBoi
+ * @version: 1.0.0
+ * @description: This plugin checks if the channel is nsfw and responds to user with a specified response if not nsfw
+ * @license: Null
+ * @example:
+ * ```ts
+ * import { nsfwOnly } from "../plugins/nsfwOnly"; //(change if need be)
+ * import { sernModule, CommandType } from "@sern/handler";
+ * export default commandModule({
+ *    plugins: [ nsfwOnly('response', true/false) ],
+ *    execute: (ctx) => {
+ *       //your code here
+ *    }
+ * })
+ * ```
+ */
+import {
+  ChannelType,
+  GuildTextBasedChannel,
+  TextBasedChannel,
+  TextChannel,
+} from "discord.js";
+import { CommandType, EventPlugin, Nullish, PluginType } from "@sern/handler";
+function isGuildText(
+  channel: Nullish<TextBasedChannel>
+): channel is GuildTextBasedChannel {
+  return (
+    channel?.type == ChannelType.GuildPublicThread ||
+    channel?.type == ChannelType.GuildPrivateThread
+  );
+}
+export function nsfwOnly(
+  onFail: string,
+  ephemeral: boolean
+): EventPlugin<CommandType.Both> {
+  return {
+    type: PluginType.Event,
+    description: "Checks if the channel is nsfw or not.",
+    async execute(event, controller) {
+      const [ctx] = event;
+      //checking if command was executed in dms
+      if (ctx.guild === null) {
+        await ctx.reply({ content: onFail, ephemeral });
+        return controller.stop();
+      }
+      //channel is thread (not supported by nsfw)
+      if (isGuildText(ctx.channel) == true) {
+        await ctx.reply({ content: onFail, ephemeral });
+        return controller.stop();
+      }
+      if (!(ctx.channel! as TextChannel).nsfw) {
+        //channel is not nsfw
+        await ctx.reply({ content: onFail, ephemeral });
+        return controller.stop();
+      }
+      //continues to command if nsfw
+      return controller.next();
+    },
+  };
+}