import type { Encodable } from "./index.js";
/** Runtime representation of a whole-value or structural sensitivity policy. */
export type SensitivityMask = true | readonly SensitivityMask[] | {
    readonly [key: string]: SensitivityMask | undefined;
};
/** Codec object types whose internal properties are not maskable structure. */
type AtomicEncodableObject = ArrayBuffer | ArrayBufferView | Blob | Date | File | Headers | Map<unknown, unknown> | RegExp | Request | Response | Set<unknown> | URL | URLSearchParams;
/**
 * Mirrors an output value with `true` at each subtree that must not be exposed.
 *
 * A one-element array mask applies to every array element. Non-structural codec
 * values can only be marked wholly sensitive.
 */
export type StructuralSensitivityMask<T> = true | (T extends unknown ? NonNullable<T> extends AtomicEncodableObject ? never : NonNullable<T> extends readonly (infer TItem)[] ? readonly [StructuralSensitivityMask<TItem>] : NonNullable<T> extends object ? {
    readonly [TKey in keyof NonNullable<T>]?: StructuralSensitivityMask<NonNullable<T>[TKey]>;
} : never : never);
/**
 * Returns whether a value is a valid runtime sensitivity mask.
 *
 * @param value - Candidate mask.
 */
export declare function isSensitivityMask(value: unknown): value is SensitivityMask;
/**
 * Replaces structurally sensitive subtrees with `undefined` for persistence in
 * author-visible execution data.
 *
 * @param value - Validated codec value being projected.
 * @param mask - Structural policy declared by the value's producer.
 * @throws {TypeError} When the mask does not match the value structure.
 */
export declare function redactSensitiveValue<T extends Encodable>(value: T, mask: SensitivityMask): T | undefined;
/**
 * Projects a structural mask through one property access.
 *
 * @param mask - Parent sensitivity mask.
 * @param property - Accessed property name or array index.
 */
export declare function projectSensitivityMask(mask: SensitivityMask | undefined, property: string): SensitivityMask | undefined;
export {};