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

import type { GestureDetail } from '../../interface';

export interface ScrollBaseDetail {
  isScrolling: boolean;
}

export interface ScrollDetail extends GestureDetail, ScrollBaseDetail {
  scrollTop: number;
  scrollLeft: number;
}

export type ScrollCallback = (detail?: ScrollDetail) => boolean | void;

export interface ScrollBaseCustomEvent extends CustomEvent {
  detail: ScrollBaseDetail;
  target: HTMLIonContentElement;
}

export interface ScrollCustomEvent extends ScrollBaseCustomEvent {
  detail: ScrollDetail;
}