export type Any = unknown;
export type AnyObject = Record<string, Any>;
export type ArrayOrObject = AnyObject | Any[];
/** @deprecated use {@link Any}. */
export type AnyVal = Any;
/** @deprecated use {@link AnyObject}. */
export type RawObject = AnyObject;
/** @deprecated use {@link Array<Any>}. */
export type RawArray = Array<Any>;
export interface Callback<R = Any, T = Any> {
    (...args: T[]): R;
}
export interface Predicate<T = Any> {
    (...args: T[]): boolean;
}
export interface Comparator<T = Any> {
    (left: T, right: T): number;
}
/**
 * Custom function to hash values to improve faster comparaisons
 */
export type HashFunction = (x: Any) => number;
type CommonTypes = "null" | "undefined" | "string" | "date" | "array" | "object";
export type JsType = CommonTypes | "boolean" | "number" | "string" | "regexp" | "function";
export type BsonType = CommonTypes | "bool" | "int" | "long" | "double" | "decimal" | "regex";
export declare const TIME_UNITS: readonly ["year", "quarter", "month", "week", "day", "hour", "minute", "second", "millisecond"];
/** Time unit for datetime periods */
export type TimeUnit = (typeof TIME_UNITS)[number];
export type Boundary = "current" | "unbounded" | number;
export interface WindowOutputOption {
    readonly documents?: [Boundary, Boundary];
    readonly range?: [Boundary, Boundary];
    readonly unit?: TimeUnit;
}
export interface SetWindowFieldsInput {
    readonly partitionBy?: Any;
    readonly sortBy: Record<string, 1 | -1>;
    readonly output: Record<string, {
        [x: string]: Any;
        window?: WindowOutputOption;
    }>;
}
export interface WindowOperatorInput {
    readonly parentExpr: SetWindowFieldsInput;
    readonly inputExpr: Any;
    readonly documentNumber: number;
    readonly field: string;
}
export {};