sync working code, and import type-doc

lib/ui/grid/grid.js

@@ -51,7 +51,7 @@ const ColumnTypes = {
     5: GridTextColumn
 };
 
-class Grid {
+export class Grid {
     #source;
     #currentSource;
     #parent;
@@ -110,8 +110,6 @@ class Grid {
         isCheckbox(type) { return type === 3 }
     };
 
-    static GridColumn = GridColumn;
-
     constructor(container) {
         this.#parent = container;
     }
@@ -412,6 +410,11 @@ class Grid {
         }
     }
 
+    clearHeaderCheckbox() {
+        const boxes = this.#refs.header.querySelectorAll('.ui-check-wrapper>input');
+        boxes.forEach(box => box.checked = false);
+    }
+
     #createHeader() {
         const thead = createElement('table', 'ui-grid-header');
         if (this.headerVisible === false) {
@@ -1552,6 +1555,4 @@ class Grid {
             }
         }
     }
-}
-
-export default Grid;
+}