/**
 * File-backed DecisionLogStore.
 *
 * Appends one signed decision entry per line (NDJSON) to
 *   ~/.agentguard/<tenant>/decisions.ndjson
 *
 * This is the default persistence used by the CLI/wizard path so that a signed
 * ledger survives across process runs and can be read by `agentguard serve`
 * and `aggregateLedger` without the user having to wire up Postgres or Redis.
 *
 * Same interface as PostgresDecisionLogStore / InMemoryDecisionLogStore. The
 * append is line-atomic (fs.appendFileSync of a single "\n"-terminated line),
 * so concurrent writers do not interleave partial lines. Ordering/chain
 * integrity remains the SpendGuard decision lock's responsibility.
 *
 * When `publicKeyHex` is supplied, it is embedded on each written line so that
 * `agentguard serve`'s click-to-verify and `aggregateLedger` integrity checks
 * can recover the verifying key from the ledger itself. The extra field is
 * ignored by the DecisionLogStore read path (only SignedDecisionLogEntry fields
 * are consumed by the SDK).
 *
 * Patent notice: Protected by U.S. patent-pending technology
 * (App. Nos. 63/983,615; 63/983,621; 63/983,843; 63/984,626;
 * 64/071,781; 64/071,789).
 */
import type { SignedDecisionLogEntry, DecisionLogStore } from '../types';
export interface NdjsonStoreOptions {
    /** Base directory. Defaults to AGENTGUARD_HOME or ~/.agentguard. */
    home?: string;
    /** Optional hex public key embedded per line so the ledger is self-verifying. */
    publicKeyHex?: string;
}
export declare class NdjsonDecisionLogStore implements DecisionLogStore {
    readonly filePath: string;
    private readonly publicKeyHex?;
    constructor(tenant: string, options?: NdjsonStoreOptions);
    append(entry: SignedDecisionLogEntry): Promise<void>;
    getLatest(signerFingerprint?: string): Promise<SignedDecisionLogEntry | null>;
    read(fromSequence: number, limit: number, signerFingerprint?: string): Promise<SignedDecisionLogEntry[]>;
    /** Remove the underlying file (used by deterministic flows like `agentguard demo`). */
    reset(): void;
    /** Parsed entries in sequence order, optionally filtered by signer. */
    private readAll;
}
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