/**
 * Target-breadth signal collectors. D42.
 *
 * SIG_BREADTH_OF_TARGET and SIG_SENSITIVE_TARGET are computed from what the
 * host observed being requested, record identifiers and endpoint labels.
 *
 * Ids are hashed before they enter this module's state, so breadth is countable
 * without the guard holding the identifiers themselves. That is the same
 * privacy posture as the rest of the library: shape, never content.
 */
export type BreadthOptions = {
    /** Distinct records above which breadth is reportable. Host-configured. */
    readonly maxDistinctRecords: number;
    /** Bounded set size, so a long session cannot grow memory without limit. */
    readonly windowSize?: number;
};
export declare const DEFAULT_BREADTH_WINDOW = 200;
export type BreadthObservation = {
    readonly broad: boolean;
    readonly distinctRecords: number;
};
/**
 * Track distinct record identifiers touched within one session.
 *
 * `record()` takes an already-opaque key. If the caller has a raw database id,
 * hash it first; this module deliberately offers no hashing, so the choice of
 * salt and algorithm stays with the host that owns the data.
 */
export declare function trackBreadth(options: BreadthOptions): {
    record(opaqueKey: string): void;
    observation(): BreadthObservation;
    reset(): void;
};
export type SensitiveTargetOptions = {
    /** Endpoint labels the host marked expensive or sensitive. */
    readonly sensitiveScopes: readonly string[];
    /** Fraction of attention on sensitive scopes above which it is reportable. */
    readonly maxSensitiveRatio: number;
};
export type SensitiveTargetObservation = {
    readonly concentrated: boolean;
    readonly sensitiveRatio: number;
};
/**
 * SIG_SENSITIVE_TARGET: attention concentrated on the endpoints the host
 * marked expensive. Ratio over the scopes actually visited, not over the
 * application's full surface: a two-page app should not read as concentrated
 * simply for having few pages.
 */
export declare function assessSensitiveTargets(visitedScopes: readonly string[], options: SensitiveTargetOptions): SensitiveTargetObservation;
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