/**
 * InjectionPolicy — 注入策略
 * 控制 token 预算、优先级排序（类型偏好 + 评分）、去重
 */
import type { KnowledgeType } from '../types/index.js';
import type { FormattedBlock } from './injection-formatter.js';
import type { ScoredEntry } from './relevance-scorer.js';
export interface InjectionPolicyOptions {
    maxTokens: number;
    preferredTypes?: KnowledgeType[];
    minScore?: number;
    deduplicateThreshold?: number;
}
export interface PolicyResult {
    selected: FormattedBlock[];
    tokensUsed: number;
    truncated: boolean;
    droppedCount: number;
}
export declare class InjectionPolicy {
    private readonly maxTokens;
    private readonly preferredTypes;
    private readonly minScore;
    private readonly deduplicateThreshold;
    constructor(options: InjectionPolicyOptions);
    apply(scored: ScoredEntry[], blocks: FormattedBlock[]): PolicyResult;
    private deduplicate;
}
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