import { EJSONOptions } from 'bson';
import { SeederCollection, LogFn } from '../common';
/**
 * Populates collections from disk.
 */
export declare class CollectionPopulator {
    /**
     * Supported file extensions
     */
    extensions: string[];
    ejsonParseOptions: EJSONOptions;
    /**
     * Logger instance
     */
    log: LogFn;
    /**
     * Constructs new `CollectionPopulator` object.
     *
     * @param extensions Array of file extensions
     * @param ejsonParseOptions  EJSON parse options
     * @param log Logger instance
     */
    constructor(extensions: string[], ejsonParseOptions: EJSONOptions, log?: LogFn);
    /**
     * Reads collections from path.
     *
     * @param path
     */
    readFromPath(path: string): SeederCollection[];
    /**
     * Read all collections from base path
     *
     * @param directories Array of directories names
     * @param inputDirectory Base directory
     */
    private readCollections;
    private sortCollections;
    /**
     * Reads collection along with documents content from a given path.
     *
     * @param path Collection Path
     * @param directoryName Directory name
     */
    private readCollection;
    /**
     * Populates MongoDB documents content by reading files.
     *
     * @param collectionPath Path for a single collection
     */
    private populateDocumentsContent;
    /**
     * Reads collection name from directory name.
     *
     * @param directoryName Directory name
     */
    private getCollectionMetadata;
    /**
     * Checks if a string is number.
     *
     * @param str String which can contain number
     */
    private isNumber;
}