[EuiSearchBar] Export onChange type

CHANGELOG.md

@@ -8,6 +8,7 @@
 - Added `markdownFormatProps` prop to `EuiMarkdownEditor` to extend the props passed to the rendered `EuiMarkdownFormat` ([#4663](https://github.com/elastic/eui/pull/4663))
 - Added optional virtualized line rendering to `EuiCodeBlock` ([#4952](https://github.com/elastic/eui/pull/4952))
 - Added `current` as a `status` of `EuiHorizontalStep` ([#4911](https://github.com/elastic/eui/pull/4911))
+- Exported `onChange` type for `EuiSearchBar` ([#4968](https://github.com/elastic/eui/pull/4968))
 
 **Bug fixes**
 

src/components/search_bar/index.ts

@@ -9,6 +9,7 @@
 export {
   EuiSearchBar,
   EuiSearchBarProps,
+  EuiSearchBarOnChangeArgs,
   QueryType,
   Query,
   Ast,

src/components/search_bar/search_bar.tsx

@@ -33,8 +33,10 @@ interface ArgsWithError {
   error: Error;
 }
 
+export type EuiSearchBarOnChangeArgs = ArgsWithQuery | ArgsWithError;
+
 export interface EuiSearchBarProps extends CommonProps {
-  onChange?: (args: ArgsWithQuery | ArgsWithError) => void | boolean;
+  onChange?: (args: EuiSearchBarOnChangeArgs) => void | boolean;
 
   /**
    The initial query the bar will hold when first mounted