First update.

CreateRoom.js

@@ -0,0 +1,26 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.generateStealthId = generateStealthId;
+exports.isStealthId = isStealthId;
+function generateStealthId(length = 32) {
+    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+    const base = chars.length;
+    const randomChars = (count) => Array.from({ length: count }, () => chars.charAt(Math.floor(Math.random() * base))).join('');
+    // 生成前 length - 1 位
+    const body = randomChars(length - 1);
+    // 将 body 每个字符的 charCode 累加，再 mod base，作为校验位
+    const sum = body.split('').reduce((acc, c) => acc + c.charCodeAt(0), 0);
+    const checksum = chars.charAt(sum % base);
+    return body + checksum;
+}
+function isStealthId(id) {
+    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+    const base = chars.length;
+    if (!/^[A-Za-z0-9]{32}$/.test(id))
+        return false;
+    const body = id.slice(0, -1);
+    const expectedChecksum = id.slice(-1);
+    const sum = body.split('').reduce((acc, c) => acc + c.charCodeAt(0), 0);
+    const checksum = chars.charAt(sum % base);
+    return checksum === expectedChecksum;
+}