/**
 * Port of `forge_app::compact::Compactor` for opencode's plugin surface.
 *
 * The opencode plugin only exposes the `experimental.session.compacting` hook,
 * so we do not need the eviction/retention windowing logic — opencode already
 * decided which tail needs to be compacted and supplies it to us. We focus on:
 *
 *   1. Converting opencode messages into `ForgeMessage` shape
 *   2. Running the summary transformer pipeline
 *   3. Rendering the `summary-frame` template
 *
 * The result is written to `output.prompt`, fully replacing opencode's default
 * compaction prompt (strategy chosen in the plan: "overwrite with summary-frame").
 */
import type { ForgeMessage } from './types';
export interface CompactOptions {
    workingDir: string;
}
export declare function renderSummaryFrame(messages: ForgeMessage[], opts: CompactOptions): Promise<string>;
/**
 * Best-effort conversion from an opencode message-part payload to a
 * `ForgeMessage`. Opencode's types are intentionally loose at this layer of the
 * plugin API, so we tolerate unknowns and only extract what the summary-frame
 * template actually consumes.
 */
export declare function toForgeMessage(raw: unknown): ForgeMessage | null;
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