[@types/react-highlight-words] fix for issues with Highlighter… (DefinitelyTyped#42473)

Fix for two issues:
* DefinitelyTyped#42472
* DefinitelyTyped#40733

Author: spamshaker

types/react-highlight-words/index.d.ts

@@ -21,7 +21,7 @@ export interface Chunk {
   end: number;
 }
 
-interface HighlighterProps {
+export interface HighlighterProps {
     /** The class name to be applied to an active match. Use along with activeIndex */
     activeClassName?: string;
     /** Specify the match index that should be actively highlighted. Use along with activeClassName */
@@ -62,6 +62,8 @@ interface HighlighterProps {
     unhighlightClassName?: string;
     /** Inline styles applied to unhighlighted text */
     unhighlightStyle?: React.CSSProperties;
+    /** Allows to pass through any parameter to wrapped component */
+    [index: string]: any;
 }
 
 declare class Highlighter extends React.Component<HighlighterProps> {}

types/react-highlight-words/react-highlight-words-tests.tsx

@@ -16,6 +16,7 @@ class HighlighterTest extends React.Component {
                     highlightTag="span"
                     searchWords={["el", "or"]}
                     textToHighlight="Hello World"
+                    customProp="My Custom Prop"
                 />
                 <Highlighter
                     activeClassName="activeClassName"