diff --git a/types/bootstrap/bootstrap-tests.ts b/types/bootstrap/bootstrap-tests.ts
index 86154f0124..b7f7d5f135 100644
--- a/types/bootstrap/bootstrap-tests.ts
+++ b/types/bootstrap/bootstrap-tests.ts
@@ -12,6 +12,8 @@ import Tab from 'bootstrap/js/dist/tab';
 import Toast from 'bootstrap/js/dist/toast';
 import Tooltip from 'bootstrap/js/dist/tooltip';
 
+declare const relatedTarget: HTMLElement;
+
 // $ExpectType typeof Alert
 Alert;
 Alert.getInstance('#alert'); // $ExpectType Alert | null
@@ -34,9 +36,19 @@ Dropdown.getInstance('#dropdown'); // $ExpectType Dropdown | null
 // $ExpectType typeof Modal
 Modal;
 Modal.getInstance('#modal'); // $ExpectType Modal | null
+Modal.getInstance('#modal')!.toggle(); // $ExpectType void
+Modal.getInstance('#modal')!.toggle(relatedTarget); // $ExpectType void
+Modal.getInstance('#modal')!.show(); // $ExpectType void
+Modal.getInstance('#modal')!.show(relatedTarget); // $ExpectType void
+
 // $ExpectType typeof Offcanvas
 Offcanvas;
 Offcanvas.getInstance('#offcanvas'); // $ExpectType Offcanvas | null
+Offcanvas.getInstance('#offcanvas')?.toggle();
+Offcanvas.getInstance('#offcanvas')?.toggle(relatedTarget);
+Offcanvas.getInstance('#offcanvas')?.show();
+Offcanvas.getInstance('#offcanvas')?.show(relatedTarget);
+
 // $ExpectType typeof Popover
 Popover;
 Popover.getInstance('#popover'); // $ExpectType Popover | null
diff --git a/types/bootstrap/js/dist/modal.d.ts b/types/bootstrap/js/dist/modal.d.ts
index b27a262afc..f198f146a4 100644
--- a/types/bootstrap/js/dist/modal.d.ts
+++ b/types/bootstrap/js/dist/modal.d.ts
@@ -29,13 +29,13 @@ declare class Modal extends BaseComponent {
      * actually been shown or hidden (i.e. before the shown.bs.modal or
      * hidden.bs.modal event occurs).
      */
-    toggle(): void;
+    toggle(relatedTarget?: HTMLElement): void;
 
     /**
      * Manually opens a modal. Returns to the caller before the modal has
      * actually been shown (i.e. before the shown.bs.modal event occurs).
      */
-    show(): void;
+    show(relatedTarget?: HTMLElement): void;
 
     /**
      * Manually hides a modal. Returns to the caller before the modal has
diff --git a/types/bootstrap/js/dist/offcanvas.d.ts b/types/bootstrap/js/dist/offcanvas.d.ts
index 37d984618e..9220c40f1c 100644
--- a/types/bootstrap/js/dist/offcanvas.d.ts
+++ b/types/bootstrap/js/dist/offcanvas.d.ts
@@ -11,9 +11,9 @@ declare class Offcanvas extends BaseComponent {
 
     static jQueryInterface: Offcanvas.jQueryInterface;
 
-    toggle(relatedTarget: HTMLElement): void;
+    toggle(relatedTarget?: HTMLElement): void;
 
-    show(relatedTarget: HTMLElement): void;
+    show(relatedTarget?: HTMLElement): void;
 
     hide(): void;
 }