pagination in es6 vs es7

pagination-es6.js

function paginate (title, baseQuery, baseUrl, errorRedirect, methods) {
    if (!baseQuery.count || !baseQuery.paginateSort) {
        throw new Error('baseQuery is missing a count or paginateSort method! - paginate.js')
    } else if (!methods.length) {
        throw new Error('methods must be an array of methods to apply to each document! - paginate.js')
    }

    return (req, res) => {
        let documentsPerPage = Math.min(parseInt(req.query.perpage) || 15, 100)
        let page = Math.max(parseInt(req.query.page), 0)

        baseQuery.count().then((documentCount) => {
            if (page * documentsPerPage > documentCount) {
                req.flash('message', `Page ${ page } does not exist. Redirecting to the first page.`)
                res.redirect(baseUrl)
            } else {
                return baseQuery.paginateSort(page, documentsPerPage).then((documents) => {
                    res.render('admin/paginate.jade', {
                        baseUrl,
                        count: documentCount,
                        documents,
                        documentsPerPage,
                        message: req.flash('message'),
                        page,
                        title,
                        user: req.user,
                    })
                })
            }
        }).catch((err) => {
            req.flash('message', err.message || err)
            res.redirect(errorRedirect)
        })
    }
}

pagination-es7.js

function paginate (title, baseQuery, baseUrl, errorRedirect, methods) {
    if (!baseQuery.count || !baseQuery.paginateSort) {
        throw new Error('baseQuery is missing a count or paginateSort method! - paginate.js')
    } else if (!methods.length) {
        throw new Error('methods must be an array of methods to apply to each document! - paginate.js')
    }

    return (req, res) => {
        let documentsPerPage = Math.min(parseInt(req.query.perpage) || 15, 100)
        let page = Math.max(parseInt(req.query.page), 0)
        
        try {
            let documentCount = await baseQuery.count()
            
            if (page * documentsPerPage > documentCount) {
                req.flash('message', `Page ${ page } does not exist. Redirecting to the first page.`)
                return res.redirect(baseUrl)
            }
            
            let documents = await baseQuery.paginateSort(page, documentsPerPage)
            
            return res.render('admin/paginate.jade', {
                baseUrl,
                count: documentCount,
                documents,
                documentsPerPage,
                message: req.flash('message'),
                page,
                title,
                user: req.user,
            })
        } catch (err) {
            req.flash('message', err.message || err)
            res.redirect(errorRedirect)
        }
    }
}