import { BaseGuardrailPlugin } from './base-plugin.js';
import { GuardrailPhase, GuardrailContext, GuardrailResult } from '../types.js';
/**
 * Token limiter plugin - limits input/output token counts
 */
export declare class TokenLimiterPlugin extends BaseGuardrailPlugin {
    name: string;
    phases: GuardrailPhase[];
    private maxInputTokens;
    private maxOutputTokens;
    private warnAtPercentage;
    initialize(config: Record<string, unknown>): Promise<void>;
    execute(phase: GuardrailPhase, context: GuardrailContext): Promise<GuardrailResult>;
    private checkInputTokens;
    private checkOutputTokens;
    /**
     * Estimate token count from text
     * Uses a simple heuristic: ~4 characters per token for English text
     * This is a rough approximation - for accuracy, use tiktoken
     */
    estimateTokenCount(text: string): number;
    /**
     * Get configured limits (for testing/monitoring)
     */
    getLimits(): {
        maxInputTokens: number;
        maxOutputTokens: number | undefined;
    };
}
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