id command to fetch the id for a modmail target

structure/commands/Id.js

@@ -0,0 +1,39 @@
+const Command = require('../Command');
+
+class ModmailID extends Command {
+
+    constructor(client) {
+        super(client, {
+            name: 'id',
+            aliases: ['mmid']
+        });
+    }
+
+    async execute(message, { args }) {
+
+        let channel = null;
+        if (args?.length) {
+            const [ch] = args;
+            channel = await this.client.resolveChannel(ch);
+        } else {
+            ({ channel } = message);
+        }
+
+        const chCache = this.client.cache.channels;
+        const result = Object.entries(chCache).find(([, val]) => {
+            return val === channel.id;
+        });
+
+        if (!result) return {
+            error: true,
+            msg: `This doesn't seem to be a valid modmail channel. Cache might be out of sync. **[MISSING TARGET]**`
+        };
+
+        const [userId] = result;
+        return userId;
+
+    }
+
+}
+
+module.exports = ModmailID;