Paging example with hapi and typescript

collection.ts

import { applyToDefaults } from 'hoek';
import { Request } from 'hapi';
var URI = require('URIjs');

export class Collection {
    public count: number;
    constructor(public items: any[] = [], public total: number) { 
        this.count = this.items.length;
        this.total = total || this.items.length;
    }

    toHal(rep: any, done: () => void) {
        let request = rep.request as Request;
        var pageSize = Number(request.query.pageSize) || 10;
        var pageNumber = Number(request.query.pageNumber) || 1;
        var totalPages = Math.ceil(this.total / pageSize);

        var uri = new URI(rep.self);
        var current = pageNumber;
        var prev = pageNumber - 1;
        var next = pageNumber + 1;
        var query = uri.search(true);

        if (pageNumber > 1) {
            rep.link('prev', uri.search(applyToDefaults(query, { pageNumber: prev, pageSize })).toString());
        }

        rep.link('current', uri.search(applyToDefaults(query, { pageNumber: current, pageSize })).toString());

        if (pageNumber < totalPages) {
            rep.link('next', uri.search(applyToDefaults(query, { pageNumber: next, pageSize })).toString());
        }

        rep.link('last', uri.search(applyToDefaults(query, { pageNumber: totalPages, pageSize })).toString());


        done();
    }
}