/**
 * Manual protobuf encoder for Google Flights' tfs parameter.
 *
 * We hand-roll the encoding instead of using a protobuf library because the
 * .proto schema is tiny and fixed, and this avoids the heavy protobufjs
 * dependency at runtime. The wire format is standard protobuf.
 *
 * Reference: https://protobuf.dev/programming-guides/encoding/
 */
export declare enum Seat {
    UNKNOWN_SEAT = 0,
    ECONOMY = 1,
    PREMIUM_ECONOMY = 2,
    BUSINESS = 3,
    FIRST = 4
}
export declare enum Trip {
    UNKNOWN_TRIP = 0,
    ROUND_TRIP = 1,
    ONE_WAY = 2,
    MULTI_CITY = 3
}
export declare enum Passenger {
    UNKNOWN_PASSENGER = 0,
    ADULT = 1,
    CHILD = 2,
    INFANT_IN_SEAT = 3,
    INFANT_ON_LAP = 4
}
export interface FlightDataProto {
    date: string;
    from_airport: string;
    to_airport: string;
    max_stops?: number;
    airlines?: string[];
}
export interface InfoProto {
    data: FlightDataProto[];
    passengers: Passenger[];
    seat: Seat;
    trip: Trip;
}
export declare function encodeInfo(info: InfoProto): Uint8Array;
export declare function encodeItinerarySummary(flights: string, price: number, currency: string): Uint8Array;
export interface DecodedItinerarySummary {
    flights: string;
    price: number;
    currency: string;
}
export declare function decodeItinerarySummary(base64: string): DecodedItinerarySummary;
export declare function encodeSOCS(gws: string, locale: string, timestamp: number): Uint8Array;