import * as TTSAPI from "../tts.js";
import { Cartesia } from "../../client.js";
import { EventEmitter } from "../../core/EventEmitter.js";
import { CartesiaError } from "../../core/error.js";
export declare class WebSocketError extends CartesiaError {
    /**
     * The error data that the API sent back in an error event.
     */
    error?: TTSAPI.WebsocketResponse.Error | undefined;
    constructor(message: string, event: TTSAPI.WebsocketResponse.Error | null);
}
type Simplify<T> = {
    [KeyType in keyof T]: T[KeyType];
} & {};
type WebsocketEvents = Simplify<{
    event: (event: TTSAPI.WebsocketResponse) => void;
    error: (error: WebSocketError) => void;
} & {
    [EventType in Exclude<NonNullable<TTSAPI.WebsocketResponse['type']>, 'error'>]: (event: Extract<TTSAPI.WebsocketResponse, {
        type?: EventType;
    }>) => unknown;
}>;
export declare abstract class TTSEmitter extends EventEmitter<WebsocketEvents> {
    /**
     * Send an event to the API.
     */
    abstract send(event: TTSAPI.WebsocketClientEvent): void | Promise<void>;
    /**
     * Close the websocket connection.
     */
    abstract close(props?: {
        code: number;
        reason: string;
    }): void;
    protected _onError(event: null, message: string, cause: any): void;
    protected _onError(event: TTSAPI.WebsocketResponse.Error, message?: string | undefined): void;
}
export declare function buildURL(client: Cartesia): URL;
export { WebSocketTimeoutError } from "../../internal/lib/tts/websocket-timeout-error.js";
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