update: hbs engine dependency and tests.

source/appexpress.js

@@ -230,15 +230,15 @@ class AppExpress {
         const extensions = Array.isArray(ext) ? ext : [ext];
 
         extensions.forEach((extension) => {
-            // `hbs`, `ejs`, `pug` have this variable,
+            // `ejs` & `pug` have this variable,
             // that is handled by express internally.
             if (engine.hasOwnProperty('__express')) {
                 this.#engine.set(extension, engine.__express);
-            } else if (typeof engine === 'function' && engine.length >= 3) {
+            } else if (typeof engine === 'function') {
                 this.#engine.set(extension, engine);
             } else {
                 throw new Error(
-                    `Invalid engine: It must either have a '__express' property or be a function with at least 3 parameters. Received function length: ${engine.length}`,
+                    `Invalid engine: It must either have a '__express' property or be a function.`,
                 );
             }
         });

source/package.json

@@ -28,7 +28,7 @@
     "ejs": "3.1.10",
     "showdown": "2.1.0",
     "prettier": "3.3.3",
-    "express-hbs": "2.5.0",
+    "express-handlebars": "8.0.1",
     "@itznotabug/appexpress-nocookies": "^0.0.4"
   },
   "keywords": [

source/tests/src/function/index.js

@@ -1,7 +1,7 @@
 import ejs from 'ejs';
 import pug from 'pug';
-import hbs from 'express-hbs';
 import showdown from 'showdown';
+import hbs from 'express-handlebars';
 
 import fs from 'fs';
 import path from 'path';
@@ -37,7 +37,9 @@ express.engine('pug', pug); // pub
 // hbs, html
 express.engine(
     ['hbs', 'html'],
-    hbs.express4({
+    hbs.engine({
+        extname: 'hbs',
+        defaultLayout: false,
         partialsDir: path.join(AppExpress.baseDirectory, 'views/partials'),
     }),
 );