"use strict";
Object.defineProperty(exports, "__esModule", {
    value: true
});
Object.defineProperty(exports, "AppRouterAnnouncer", {
    enumerable: true,
    get: function() {
        return AppRouterAnnouncer;
    }
});
const _react = require("react");
const _reactdom = require("react-dom");
const ANNOUNCER_TYPE = "next-route-announcer";
const ANNOUNCER_ID = "__next-route-announcer__";
function getAnnouncerNode() {
    var _existingAnnouncer_shadowRoot;
    const existingAnnouncer = document.getElementsByName(ANNOUNCER_TYPE)[0];
    if (existingAnnouncer == null ? void 0 : (_existingAnnouncer_shadowRoot = existingAnnouncer.shadowRoot) == null ? void 0 : _existingAnnouncer_shadowRoot.childNodes[0]) {
        return existingAnnouncer.shadowRoot.childNodes[0];
    } else {
        const container = document.createElement(ANNOUNCER_TYPE);
        container.style.cssText = "position:absolute";
        const announcer = document.createElement("div");
        announcer.ariaLive = "assertive";
        announcer.id = ANNOUNCER_ID;
        announcer.role = "alert";
        announcer.style.cssText = "position:absolute;border:0;height:1px;margin:-1px;padding:0;width:1px;clip:rect(0 0 0 0);overflow:hidden;white-space:nowrap;word-wrap:normal";
        // Use shadow DOM here to avoid any potential CSS bleed
        const shadow = container.attachShadow({
            mode: "open"
        });
        shadow.appendChild(announcer);
        document.body.appendChild(container);
        return announcer;
    }
}
function AppRouterAnnouncer(param) {
    let { tree  } = param;
    const [portalNode, setPortalNode] = (0, _react.useState)(null);
    (0, _react.useEffect)(()=>{
        const announcer = getAnnouncerNode();
        setPortalNode(announcer);
        return ()=>{
            const container = document.getElementsByTagName(ANNOUNCER_TYPE)[0];
            if (container == null ? void 0 : container.isConnected) {
                document.body.removeChild(container);
            }
        };
    }, []);
    const [routeAnnouncement, setRouteAnnouncement] = (0, _react.useState)("");
    const previousTitle = (0, _react.useRef)();
    (0, _react.useEffect)(()=>{
        let currentTitle = "";
        if (document.title) {
            currentTitle = document.title;
        } else {
            const pageHeader = document.querySelector("h1");
            if (pageHeader) {
                currentTitle = pageHeader.innerText || pageHeader.textContent || "";
            }
        }
        // Only announce the title change, but not for the first load because screen
        // readers do that automatically.
        if (previousTitle.current !== undefined && previousTitle.current !== currentTitle) {
            setRouteAnnouncement(currentTitle);
        }
        previousTitle.current = currentTitle;
    }, [
        tree
    ]);
    return portalNode ? /*#__PURE__*/ (0, _reactdom.createPortal)(routeAnnouncement, portalNode) : null;
}

if ((typeof exports.default === 'function' || (typeof exports.default === 'object' && exports.default !== null)) && typeof exports.default.__esModule === 'undefined') {
  Object.defineProperty(exports.default, '__esModule', { value: true });
  Object.assign(exports.default, exports);
  module.exports = exports.default;
}

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