import { NmeaSentence } from "./NmeaSentence";
export declare abstract class ChecksumSentence extends NmeaSentence {
    /**
     * The optional checksum in a valid "talker sentence" is separated by a "*" character.
     */
    static readonly ChecksumSeparator = "*";
    /**
     * Whether or not this sentence contains a checksum value (a "*" and two hexadecimal characters at the end).
     */
    protected get hasChecksum(): boolean;
    /**
     * Returns all characters between "$" and "*" if there is one or between "$" and "<CR><LF>".
     */
    protected get dataNoChecksum(): string;
    /**
     * Returns the last two characters at the end of the sentence, excluding "<CR><LF>".
     */
    protected get checksum(): string;
    /**
     * If this sentence has a checksum, returns whether it is valid or not. Otherwise returns true.
     */
    protected get checksumValid(): boolean;
    /**
     * Returns all fields (including the first field in the sentence) separated by comma. Excludes checksum.
     */
    get fields(): string[];
    /**
     * Whether or not this sentence is a valid NMEA0183 talker sentence.
     *
     * This getter also validates the checksum, if there is one.
     */
    get valid(): boolean;
    get invalidReason(): null | string;
}