[react-mentions] MentionInput should extend textarea props (#35352)

types/react-mentions/index.d.ts

@@ -6,6 +6,9 @@
 // TypeScript Version: 2.8
 import * as React from "react";
 
+type Omit<T, K> = Pick<T, Exclude<keyof T, K>>;
+export {};
+
 /**
  * MentionsInput is the main component rendering the textarea control. It takes one or multiple Mention components as its children.
  */
@@ -19,7 +22,7 @@ export const Mention: React.SFC<MentionProps>;
 /**
  * The properties for the @see MentionsInput component.
  */
-export interface MentionsInputProps {
+export interface MentionsInputProps extends Omit<React.TextareaHTMLAttributes<HTMLTextAreaElement>, 'onChange' | 'onBlur' | 'onKeyDown' | 'onSelect'> {
     /**
      * If set to `true` a regular text input element will be rendered
      * instead of a textarea