import type { AuditEntry } from "./types.js";
/**
 * Appends structured audit entries to .bober/medical/audit-<date>.jsonl.
 *
 * File is opened O_APPEND|O_CREAT with mode 0600. The date in the filename
 * is derived from the INJECTED tIso field of each entry — never the wall clock.
 *
 * PHI rule: entries hold IDs/enums ONLY (tIso, event, rulesetVersion?,
 * patternsetVersion?, ruleId?). NEVER serialize prompt text or health values.
 *
 * bober: single-process append; if multi-process concurrent writes are needed,
 *        swap for a SQLite WAL or a locking file-writer.
 */
export declare class AuditLog {
    private readonly projectRoot;
    constructor(projectRoot: string);
    /**
     * Filename derives from the INJECTED tIso (YYYY-MM-DD slice).
     * Never Date.now().
     */
    private path;
    /**
     * Append one AuditEntry as a newline-terminated JSON line.
     *
     * Uses O_APPEND|O_CREAT with mode 0600 and an explicit fh.chmod(0600)
     * to guarantee the file mode even if umask would reduce it.
     * NEVER uses appendFile — it does not reliably honour the mode argument.
     */
    append(entry: AuditEntry): Promise<void>;
}
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