export declare const LATENCY_FILLER_CONNECTIVES: readonly ["So,", "Well,", "Right,", "Okay,", "Hmm,"];
export type LatencyFillerConnective = (typeof LATENCY_FILLER_CONNECTIVES)[number];
export interface LatencyFillerState {
    readonly text: string;
    active: boolean;
    spliced: boolean;
    cancelled: boolean;
    readonly startedAtMs: number;
}
export interface LatencyFillerConfig {
    readonly enabled?: boolean;
}
export declare class LatencyFillerController {
    private readonly enabled;
    private turnIndex;
    private readonly states;
    constructor(config?: LatencyFillerConfig);
    isEnabled(): boolean;
    start(contextId: string, userText: string, nowMs?: number): string | null;
    getState(contextId: string): LatencyFillerState | undefined;
    isActive(contextId: string): boolean;
    isFillerOnly(contextId: string): boolean;
    spliceLlmDelta(contextId: string, delta: string): string;
    cancel(contextId: string): LatencyFillerState | null;
    clear(contextId: string): void;
}
export declare function selectLatencyFillerConnective(userText: string, turnIndex: number): string;
export declare function stripRedundantFillerPrefix(fillerText: string, llmText: string): string;
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