/**
 * Trust chrome — the DECISION, not a rendering.
 *
 * `decideChrome` says whether a piece of copy counts as adapted for this
 * viewer. Nothing in the SDK renders a visible mark from it by default; the
 * react package exports `InlineMark` for integrators who opt into one, and
 * the impression beacon reports the decision so chrome state stays
 * measurable.
 *
 * The honesty constraint (the part W5 exists for): `marked` must NOT be true
 * for copy that was merely served. Before content-source signalling, the
 * silent static-fallback path was indistinguishable on the wire from live
 * generation — so a client marking "everything that came down a stream"
 * would have been labelling stored copy as adapted. Claiming static copy is
 * adapted is a worse failure than under-claiming generated copy, because one
 * under-claims and the other lies.
 */
import type { ContentSource } from "./wire.js";
/** Where the viewer's "show me the standard version" preference lives. */
export declare const STANDARD_MODE_KEY = "st:standard";
export interface ChromeDecision {
    /** Does this copy count as adapted for this viewer? (Feed an opt-in
     * disclosure mark, and the impression beacon, from this.) */
    marked: boolean;
    /**
     * Why, in one machine-readable word. Reported on the impression, so the
     * chrome state of real traffic is measurable rather than assumed.
     */
    reason: "generated" | "cached" | "static" | "viewer-opted-out";
}
/**
 * Should this copy carry the adaptation mark?
 *
 * `cached` counts as adapted: the copy WAS generated, for an earlier viewer in
 * the same variant × context bucket. It is not fresh, but it is not authored
 * either, and calling it authored would be the same lie in the other
 * direction.
 */
export declare function decideChrome(contentSource: ContentSource, viewerPrefersStandard: boolean): ChromeDecision;
/**
 * Read the viewer's preference.
 *
 * Any failure — no storage, disabled storage, SSR, a privacy mode that throws
 * on access — means "no stated preference", which is the marked default. A
 * storage error must never be a route to an unmarked creative.
 */
export declare function viewerPrefersStandard(storage?: Storage): boolean;
/** Persist the viewer's preference. Silent on failure, for the same reason. */
export declare function setViewerPrefersStandard(value: boolean, storage?: Storage): void;
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