import type { ProviderMessage } from '../providers/interface.js';
import type { ProviderRegistry } from '../providers/registry.js';
import type { CompactionContext } from './context-compaction.js';
import type { CompactionReceipt, CompactionStrategyChoice } from './compaction-types.js';
import type { SessionMemoryStore } from './session-memory.js';
import type { SessionLineageTracker } from './session-lineage.js';
/**
 * Resolve the effective compaction strategy from the `behavior.compactionStrategy`
 * config value and the `compaction-distiller-strategy` feature-flag state.
 *
 * The distiller only runs when BOTH the config selects it AND the flag is on,
 * the flag is the graduation gate, so a `distiller` config value with a dark
 * flag honestly resolves back to `structured` (the un-graduated default). Any
 * unrecognized config value also resolves to `structured`.
 */
export declare function resolveCompactionStrategy(configStrategy: string | undefined, distillerFlagEnabled: boolean): CompactionStrategyChoice;
export interface ConversationCompactionHost {
    getMessageCount(): number;
    getMessagesForLLM(): ProviderMessage[];
    replaceMessagesForLLM(newMessages: ProviderMessage[]): void;
    getSessionMemoryStore(): Pick<SessionMemoryStore, 'list'> | null;
    getSessionLineageTracker(): Pick<SessionLineageTracker, 'addCompactionEntry'>;
}
export declare function compactConversation(host: ConversationCompactionHost, registry: ProviderRegistry, modelId: string, trigger?: 'auto' | 'manual', provider?: string, context?: CompactionContext): Promise<CompactionReceipt | undefined>;
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