import { type ConversationEnvironment, simpleTokenEstimator } from './environment';
import type { Conversation, Message, TokenEstimator } from './types';
export { simpleTokenEstimator };
/**
 * Estimates total tokens in a conversation using the provided estimator function.
 * If no estimator is provided, the environment's default estimator is used.
 */
export declare function estimateConversationTokens(conversation: Conversation, estimateTokens?: TokenEstimator, environment?: Partial<ConversationEnvironment>): number;
/**
 * Options for truncateToTokenLimit.
 */
export interface TruncateOptions {
    estimateTokens?: TokenEstimator;
    preserveSystemMessages?: boolean;
    preserveLastN?: number;
    preserveToolPairs?: boolean;
}
/**
 * Truncates conversation to fit within an estimated token limit.
 * Removes oldest messages first while preserving system messages and optionally the last N messages.
 * If no estimator is provided, the environment's default estimator is used.
 * Tool interactions are preserved as atomic blocks by default.
 */
export declare function truncateToTokenLimit(conversation: Conversation, maxTokens: number, optionsOrEstimator?: TruncateOptions | TokenEstimator, environment?: Partial<ConversationEnvironment>): Conversation;
/**
 * Returns the last N messages from the conversation.
 * By default excludes system messages and hidden messages.
 * Tool interactions are preserved as atomic blocks by default.
 */
export declare function getRecentMessages(conversation: Conversation, count: number, options?: {
    includeHidden?: boolean;
    includeSystem?: boolean;
    preserveToolPairs?: boolean;
}): ReadonlyArray<Message>;
/**
 * Truncates conversation to keep only messages from the specified position onwards.
 * Optionally preserves system messages regardless of position.
 * Tool interactions are preserved as atomic blocks by default.
 */
export declare function truncateFromPosition(conversation: Conversation, position: number, options?: {
    preserveSystemMessages?: boolean;
    preserveToolPairs?: boolean;
}, environment?: Partial<ConversationEnvironment>): Conversation;
//# sourceMappingURL=context.d.ts.map