@stencil/router/dist/collection/utils/createScrollHistory.js

Stencil Router

import { storageAvailable } from './dom-utils';
const createScrollHistory = (win, applicationScrollKey = 'scrollPositions') => {
    let scrollPositions = new Map();
    const set = (key, value) => {
        scrollPositions.set(key, value);
        if (storageAvailable(win, 'sessionStorage')) {
            const arrayData = [];
            scrollPositions.forEach((value, key) => {
                arrayData.push([key, value]);
            });
            win.sessionStorage.setItem('scrollPositions', JSON.stringify(arrayData));
        }
    };
    const get = (key) => {
        return scrollPositions.get(key);
    };
    const has = (key) => {
        return scrollPositions.has(key);
    };
    const capture = (key) => {
        set(key, [win.scrollX, win.scrollY]);
    };
    if (storageAvailable(win, 'sessionStorage')) {
        const scrollData = win.sessionStorage.getItem(applicationScrollKey);
        scrollPositions = scrollData ?
            new Map(JSON.parse(scrollData)) :
            scrollPositions;
    }
    if ('scrollRestoration' in win.history) {
        history.scrollRestoration = 'manual';
    }
    return {
        set,
        get,
        has,
        capture
    };
};
export default createScrollHistory;