import type { ShieldConfig, ScanResult, ScanContext } from "./types.js";
import { PolicyEngine } from "./policy/engine.js";
export declare class AIShield {
    private chain;
    private policyEngine;
    private costTracker;
    private auditLogger;
    private scanCache;
    private config;
    constructor(config?: ShieldConfig);
    /** Scan input text — the main API */
    scan(input: string, context?: ScanContext): Promise<ScanResult>;
    /** Check cost budget before making an LLM call */
    checkBudget(entityId: string, model: string, estimatedInputTokens: number, estimatedOutputTokens?: number): Promise<import("./types.js").BudgetCheckResult>;
    /** Record cost after receiving LLM response */
    recordCost(entityId: string, model: string, inputTokens: number, outputTokens: number): Promise<import("./types.js").CostRecord | null>;
    /** Get current spend for an entity */
    getCurrentSpend(entityId: string): Promise<number>;
    /** Get the policy engine */
    getPolicy(): PolicyEngine;
    /** Clear the scan cache */
    clearCache(): void;
    /** Get cache stats */
    get cacheSize(): number;
    /** Graceful shutdown */
    close(): Promise<void>;
    private buildCacheKey;
    private setupScanners;
    private setupAudit;
}
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