/**
 * Error taxonomy.
 *
 * The upstream library surfaced every failure as an opaque `error` event, so consumers could not
 * tell "the stream ended" apart from "we are being rate limited" apart from "YouTube changed its
 * HTML and our scraping broke". Those need different reactions, so they get different types.
 */
/** Base class for every error this library emits. */
export declare abstract class YoutubeChatError extends Error {
    constructor(message: string);
}
/**
 * The live page could not be scraped: a required token was missing.
 *
 * Almost always means YouTube changed its page shape and this library needs a patch — as opposed
 * to a transient failure. Consumers should treat this as "stop and alert", not "retry".
 */
export declare class ScrapeError extends YoutubeChatError {
    readonly field: string;
    constructor(field: string, message?: string);
}
/** The requested stream does not exist, is not live, or is a finished/replay stream. */
export declare class NotLiveError extends YoutubeChatError {
}
/** YouTube rate limited (429) or rejected (403) the request. */
export declare class RateLimitError extends YoutubeChatError {
    readonly status: number;
    readonly retryAfterMs?: number | undefined;
    constructor(status: number, retryAfterMs?: number | undefined);
}
/**
 * A chat response arrived but did not parse into the shape we expect.
 *
 * Like ScrapeError, this is a drift signal rather than a transient fault.
 */
export declare class ParseError extends YoutubeChatError {
}