import type { RealtimeConfig, RealtimeProvider } from "../../shared/voice.js";
export type { RealtimeConfig };
/** Provider names `createRealtimeProvider` accepts. */
export declare const REALTIME_PROVIDERS: readonly ["openai"];
/**
 * The voices the named provider offers, for a setup surface that wants to show
 * a picker instead of a text field. Empty for a provider this gateway does not
 * implement — the same answer `createRealtimeProvider` gives, in list form.
 */
export declare function realtimeProviderVoices(provider: string | undefined): readonly string[];
export declare class UnknownRealtimeProviderError extends Error {
    readonly provider: string | undefined;
    constructor(provider: string | undefined);
}
/**
 * Build the provider named by the `realtime` config block. `apiKey` may be a
 * `${ENV_VAR}` reference, so the key can live in the environment rather than in
 * config.yaml. Throws {@link UnknownRealtimeProviderError} for a name we do not
 * implement, and a plain Error when the named provider is missing its key.
 */
export declare function createRealtimeProvider(config: RealtimeConfig): RealtimeProvider;
/**
 * Whether {@link createRealtimeProvider} would succeed on this block.
 *
 * Answered by building one rather than by re-stating the rules, so the setup
 * surface can never drift from the factory it is describing — a provider name
 * this file does not implement and a `${ENV_VAR}` key whose variable is unset
 * both read as unconfigured, because both are what the factory refuses.
 * Construction opens no socket and mints nothing, so asking costs nothing.
 */
export declare function isRealtimeConfigured(config: RealtimeConfig): boolean;
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