fix: Add types for Popover sub-components

types/components/Popover.d.ts

@@ -3,6 +3,8 @@ import * as React from 'react';
 import { Placement } from './Overlay';
 
 import { BsPrefixComponent } from './helpers';
+import PopoverContent from './PopoverContent';
+import PopoverTitle from './PopoverTitle';
 
 export interface PopoverProps {
   id: string | number;
@@ -11,6 +13,9 @@ export interface PopoverProps {
   arrowProps?: { ref: any; style: object };
 }
 
-declare class Popover extends BsPrefixComponent<'div', PopoverProps> {}
+declare class Popover extends BsPrefixComponent<'div', PopoverProps> {
+  static Title: typeof PopoverTitle;
+  static Content: typeof PopoverContent;
+}
 
 export default Popover;

types/components/PopoverContent.d.ts

@@ -0,0 +1,9 @@
+import * as React from 'react';
+import Button from './Button';
+import { BsPrefixComponent } from './helpers';
+
+declare class PopoverContent<
+  As extends React.ReactType = 'div'
+  > extends BsPrefixComponent<As> { }
+
+export default PopoverContent;

types/components/PopoverTitle.d.ts

@@ -0,0 +1,9 @@
+import * as React from 'react';
+import Button from './Button';
+import { BsPrefixComponent } from './helpers';
+
+declare class PopoverTitle<
+  As extends React.ReactType = 'div'
+  > extends BsPrefixComponent<As> { }
+
+export default PopoverTitle;

types/components/index.d.ts

@@ -74,7 +74,10 @@ export { default as Overlay, OverlayProps } from './Overlay';
 export { default as OverlayTrigger, OverlayTriggerProps } from './OverlayTrigger';
 export { default as PageItem, PageItemProps } from './PageItem';
 export { default as Pagination, PaginationProps } from './Pagination';
+
 export { default as Popover, PopoverProps } from './Popover';
+export { default as PopoverTitle } from './PopoverTitle';
+export { default as PopoverContent } from './PopoverContent';
 export { default as ProgressBar, ProgressBarProps } from './ProgressBar';
 export { default as ResponsiveEmbed, ResponsiveEmbedProps } from './ResponsiveEmbed';
 export { default as Row, RowProps } from './Row';