export interface ChatBoundaryInfo {
    readonly assistantPrefix: string;
    readonly assistantSuffix: string;
    readonly nextTurnPrefixes: readonly string[];
    readonly eosText: string;
}
export interface BoundarySplit {
    readonly safeText: string;
    readonly trailingText: string;
    readonly hitBoundary: boolean;
}
export interface BoundaryConsumeResult {
    readonly safeText: string;
    readonly hitBoundary: boolean;
}
export declare function sliceUndeliveredSuffix(deliveredOutputText: string, finalOutputText: string): string;
export declare class TokenBoundaryTextSanitizer {
    private readonly boundaryMarkers;
    private pendingText;
    private stopped;
    constructor(boundaryMarkers: readonly string[]);
    get reachedBoundary(): boolean;
    consume(text: string): BoundaryConsumeResult;
    flush(): string;
}
export declare function buildBoundaryMarkers(info: ChatBoundaryInfo): readonly string[];
export declare function splitOnChatBoundary(text: string, boundaryMarkers: readonly string[]): BoundarySplit;
export declare function trimTrailingBoundaryPrefix(text: string, boundaryMarkers: readonly string[]): string;