export = extractFields;
/**
 * Extract nested fields of an object in a flat array.
 * Example: { field : { 1: "nested", 2: "nested" } } => [ 'field.1', 'field.2' ]
 *
 * @param {Object} document - Document to extract fields from
 * @param {Object} options - alsoExtractValues (false), fieldsToIgnore ( [ ] )
 *
 * @returns { Array<String> | Array<{ key: String, value: any }> }
 */
declare function extractFields(document: any, { fieldsToIgnore, alsoExtractValues }?: any, { path, extractedFields }?: {
    path?: any;
    extractedFields?: any[];
}): Array<string> | Array<{
    key: string;
    value: any;
}>;