import type { ImageContent, Message, TextContent } from "@bastani/pi-ai/compat";
import type { NumberedRegion } from "./compaction-types.js";
export declare const FILTERED_MARKER_RE: RegExp;
export declare const LINE_NUMBER_SEPARATOR = "\u2192";
export declare const ROLE_HEADER_RE: RegExp;
/** One piece of a serialized transcript: literal text, or an image kept at its position. */
export type TranscriptChunk = TextContent | ImageContent;
export declare function filteredMarker(lineCount: number): string;
/** Serialize provider messages using the durable verbatim-compaction section grammar. */
export declare function serializeConversationForCompaction(messages: Message[]): string;
/**
 * Serialize retained messages without losing payloads: tool results keep their full text and
 * images stay as image blocks at their position in the transcript.
 */
export declare function serializeRetainedTranscript(messages: Message[]): TranscriptChunk[];
/**
 * One-based line numbers covered by `<keepContext>` spans, inclusive of the tag lines.
 *
 * Spans are scoped to a single message: a role header ends any span still open, and an unclosed
 * span protects through the end of its own message rather than the end of the region. Together
 * with the whole-line marker rule and the tool-result exclusion, that keeps the permissive
 * unclosed case safe — quoted or injected tag text costs at most its own message instead of
 * everything after it. Compaction that cannot reclaim is an overflow, not a safe failure.
 *
 * Nested openers flatten into the outermost span, and a closing tag with no opener is inert.
 */
export declare function keepContextLineNumbers(lines: readonly string[]): Set<number>;
export declare function createNumberedRegion(text: string, protectedLineNumbers?: ReadonlySet<number>): NumberedRegion;
export declare function createConversationRegion(messages: Message[], previousSummary?: string): NumberedRegion;
export declare function numberRegionLines(region: NumberedRegion, start?: number, end?: number): string;
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