/**
 * Writing a canonical session into a new Claude Code session file.
 *
 * C-9 measured that a file holding one `user` entry and one `assistant` entry is listed by the
 * native resume list and opened by `claude --resume <id>` as native turns. This module writes
 * exactly those two entry types and nothing else: the other eight types of C-3 are eight more
 * ways to corrupt an internal application database.
 *
 * Nothing here touches the filesystem except to read. `serialize` returns bytes;
 * `src/import/landing/` creates the files (FR-49, FR-53).
 */
import type { CanonicalSession, ProvenanceMarker, SerializedSession, TargetProfile, ValidationDefect } from "./contract.js";
/** The version C-9 was measured against. Written so the target reads a version it knows. */
export declare const CLAUDE_CODE_FORMAT_VERSION = "2.1.220";
/** The model field of an imported turn. No model produced it, and none is claimed. */
export declare const IMPORTED_MODEL = "imported";
export declare const USER_TYPE = "external";
/** Bytes only: the file is created by `src/import/landing/`, never here (FR-49, FR-53). */
export declare function serialize(session: CanonicalSession, target: TargetProfile, marker: ProvenanceMarker, context: {
    cwd: string;
}): SerializedSession;
/** Every structural defect, not the first (FR-50). Empty means the bytes may be placed. */
export declare function validate(serialized: SerializedSession): ValidationDefect[];