/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import type { SafetyCheckInput, ConversationTurn } from './protocol.js';
import type { Config } from '../config/config.js';
/**
 * Builds context objects for safety checkers, ensuring sensitive data is filtered.
 */
export declare class ContextBuilder {
    private readonly config;
    private readonly conversationHistory;
    constructor(config: Config, conversationHistory?: ConversationTurn[]);
    /**
     * Builds the full context object with all available data.
     */
    buildFullContext(): SafetyCheckInput['context'];
    /**
     * Builds a minimal context with only the specified keys.
     */
    buildMinimalContext(requiredKeys: Array<keyof SafetyCheckInput['context']>): SafetyCheckInput['context'];
}