type EventHandler = (event: Record<string, unknown>) => void;
type SwitchHandler = (slug: string) => void;
type TokenHandler = (data: {
    total_tokens: number;
    cost_usd: number;
}) => void;
export declare function onEvent(handler: EventHandler): void;
export declare function onSwitch(handler: SwitchHandler): void;
export declare function onToken(handler: TokenHandler): void;
export declare function getActivePort(): number;
export declare function startServer(): Promise<number>;
export {};
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