sync working code, and import type-doc

lib/ui/dropdown.js

@@ -81,7 +81,7 @@ function filterSource(searchkeys, textkey, key, source) {
     return source;
 }
 
-class Dropdown {
+export class Dropdown {
     #options;
 
     #wrapper;
@@ -412,7 +412,7 @@ class Dropdown {
                     createCheckbox({
                         label: r('allItem', '( All )'),
                         checked: allchecked,
-                        customerAttributes: { 'isall': '1' },
+                        customAttributes: { 'isall': '1' },
                         onchange: e => this.#triggerselect(e.target)
                     })
                 )
@@ -444,7 +444,7 @@ class Dropdown {
                 const box = createCheckbox({
                     label,
                     checked: allchecked || selected,
-                    customerAttributes: {
+                    customAttributes: {
                         'class': 'dataitem',
                         'data-value': val
                     },
@@ -527,6 +527,4 @@ class Dropdown {
         }
         return dom;
     }
-}
-
-export default Dropdown;
+}