import { Collection } from "mongodb";
import { ObjectID } from "bson";
import Base from "./models/base";
/** A pager allows paging through a collection of records. */
export default class Pager<M extends Base> {
    /** The collection to page through. */
    readonly collection: Collection;
    /** The maximum number of records on a single page. */
    private maxPageSize;
    /** The query that defines the dataset to load. */
    private _query;
    /** The fields to return in the results. */
    private _fields;
    /** Construct given the collection, query and fields. */
    constructor(collection: Collection);
    /** Sets the query to use for this pager. */
    query(query: {
        [field: string]: any;
    }): Pager<M>;
    /** Sets the fields to include in pages. */
    fields(fields: {
        [field in keyof M]?: 1 | 0 | boolean;
    }): Pager<M>;
    /**
     * Loads a page of records.
     * @param id the id of the page to load, if null then the first page is loaded.
     */
    load(id?: ObjectID): Promise<Page<M>>;
}
/** The default page size. */
export declare const DEFAULT_PAGE_SIZE = 30;
/** A single page of records. */
export interface Page<M> {
    /** The records on this page. */
    records: M[];
    /**
     * The id to load the next page of records.
     * This will be null if this is the last page.
     */
    nextId?: ObjectID;
}