@awsui/components-react/autosuggest/announcer.js

AWS UI is a collection of [React](https://reactjs.org/) components that help create intuitive, responsive, and accessible user experiences for web applications. It is developed by Amazon Web Services (AWS). This work is available under the terms of the [A

import React, { useMemo, useRef } from 'react';
import { LiveRegion } from '../internal/components/live-region';
import defaultOptionDescription from '../internal/components/option/option-announcer';
import { getParentGroup } from './controller';
var Announcer = function (_a) {
    var item = _a.item, usingMouse = _a.usingMouse;
    var prevAnnouncedGroup = useRef(undefined);
    var prevAnnouncement = useRef('');
    var message = useMemo(function () {
        if (usingMouse.current) {
            return prevAnnouncement.current;
        }
        if (!item) {
            prevAnnouncement.current = '';
            prevAnnouncedGroup.current = undefined;
            return '';
        }
        else {
            var parentGroup = getParentGroup(item);
            if (parentGroup !== prevAnnouncedGroup.current) {
                prevAnnouncedGroup.current = parentGroup;
            }
            else {
                parentGroup = undefined;
            }
            var message_1 = defaultOptionDescription(item, parentGroup);
            prevAnnouncement.current = message_1;
            return message_1;
        }
    }, [item, usingMouse]);
    return React.createElement(LiveRegion, { message: message });
};
export default Announcer;