import { Component } from 'react';
export interface Accessibility {
    /**
     * Query whether a screen reader is currently enabled. Returns a promise which resolves to a boolean.
     * The result is true when a screen reader is enabled and false otherwise.
     * It is supported in reactxp
     */
    fetch: () => void;
    /**
     * Add an event handler. Supported events:
     * change: Fires when the state of the screen reader changes. The argument to the event handler is a boolean.
     * The boolean is true when a screen reader is enabled and false otherwise.
     * announcementFinished: iOS-only event. Fires when the screen reader has finished making an announcement.
     * The argument to the event handler is a dictionary with these keys:
     * announcement: The string announced by the screen reader.
     * success: A boolean indicating whether the announcement was successfully made.
     * It is supported in react-native
     */
    addEventListener: (eventName: string, handler: () => void) => void;
    /**
     * iOS-Only. Set accessibility focus to a react component.
     * It is supported in react-native
     */
    setAccessibilityFocus: (reactTag: Component) => void;
    /**
     * Remove an event handler.
     * It is supported in react-native
     */
    removeEventListener: (eventName: string, handler: () => void) => void;
    /**
     * Triggered when the high-contrast setting changes.
     * This support is  in Reactxp
     */
    highContrastChangedEvent: (isEnabled: boolean) => void;
    /**
     * Triggered when the screen reader setting changes.
     * This support is  in Reactxp
     */
    screenReaderChangedEvent: (isEnabled: boolean) => void;
    /**
     * Sends the specified string to the screen reader.
     * This support is  in Reactxp and react-native
     */
    announceForAccessibility: (announcement: string) => void;
    /**
     * Indicates whether a screen reader is currently enabled.
     * This support is  in Reactxp
     */
    isScreenReaderEnabled(): boolean;
    /**
     * Inidicates whether the OS-level "high-contrast" setting is enabled.
     * This support is  in Reactxp
     */
    isHighContrastEnabled(): boolean;
}