feat(all): add CustomEvents types to components that emit events (#23956)

resolves #22925

BREAKING CHANGE: The `RadioChangeEventDetail` interface has been removed in favor of `RadioGroupChangeEventDetail`.

core/src/components/content/content-interface.ts

@@ -10,3 +10,12 @@ export interface ScrollDetail extends GestureDetail, ScrollBaseDetail {
 }
 
 export type ScrollCallback = (detail?: ScrollDetail) => boolean | void;
+
+export interface ScrollBaseCustomEvent extends CustomEvent {
+  detail: ScrollBaseDetail;
+  target: HTMLIonContentElement;
+}
+
+export interface ScrollCustomEvent extends ScrollBaseCustomEvent {
+  detail: ScrollDetail;
+}

core/src/components/content/readme.md

@@ -11,6 +11,46 @@ Content, along with many other Ionic components, can be customized to modify its
 
 In order to place elements outside of the scrollable area, `slot="fixed"` can be added to the element. This will absolutely position the element placing it in the top left. In order to place the element in a different position, style it using [top, right, bottom, and left](https://developer.mozilla.org/en-US/docs/Web/CSS/position).
 
+## Interfaces
+
+### ScrollBaseDetail
+
+```typescript
+interface ScrollBaseDetail {
+  isScrolling: boolean;
+}
+```
+
+### ScrollDetail
+
+```typescript
+interface ScrollDetail extends GestureDetail, ScrollBaseDetail {
+  scrollTop: number;
+  scrollLeft: number;
+}
+```
+
+### ScrollBaseCustomEvent 
+
+While not required, this interface can be used in place of the `CustomEvent` interface for stronger typing on the `ionScrollStart` and `ionScrollEnd` events.
+
+```typescript
+interface ScrollBaseCustomEvent extends CustomEvent {
+  detail: ScrollBaseDetail;
+  target: HTMLIonContentElement;
+}
+```
+
+### ScrollCustomEvent 
+
+While not required, this interface can be used in place of the `CustomEvent` interface for stronger typing on the `ionScroll` event.
+
+```typescript
+interface ScrollCustomEvent extends ScrollBaseCustomEvent {
+  detail: ScrollDetail;
+}
+```
+
 
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