Add documentation.

react-modal/index.d.ts

@@ -8,7 +8,9 @@
 
 declare module "react-modal" {
     interface ReactModal {
+        /* Boolean describing if the modal should be shown or not. Defaults to false. */
         isOpen: boolean;
+        /* Object indicating styles to be used for the modal, divided into overlay and content styles. */
         style?: {
             content?: {
                 [key: string]: any;
@@ -17,14 +19,23 @@ declare module "react-modal" {
                 [key: string]: any;
             };
         };
+        /* Set this to properly hide your application from assistive screenreaders and other assistive technologies while the modal is open. */
         appElement?: HTMLElement | {};
+        /* Function that will be run after the modal has opened. */
         onAfterOpen?: () => void;
+        /* Function that will be run when the modal is requested to be closed, prior to actually closing. */
         onRequestClose?: () => void;
+        /* Number indicating the milliseconds to wait before closing the modal. Defaults to zero (no timeout). */
         closeTimeoutMS?: number;
+        /* Boolean indicating if the appElement should be hidden. Defaults to true. */
         ariaHideApp?: boolean;
+        /* Boolean indicating if the overlay should close the modal. Defaults to true. */
         shouldCloseOnOverlayClick?: boolean;
+        /* String className to be applied to the overlay. */
         overlayClassName?: string;
+        /* String className to be applied to the modal content. */
         className?: string;
+        /* String indicating how the content container should be announced to screenreaders. */
         contentLabel?: string;
     }
     let ReactModal: React.ClassicComponentClass<ReactModal>;