/**
 * Overlay attestation (ggui#987 §6.3): ONE canonical serialization and ONE
 * hash for the per-app theme overlay, so every minter (a platform's
 * projector, a console, a CLI) and every write door compute the same bytes.
 *
 * Canonical JSON: object keys sorted recursively, no whitespace, `undefined`
 * members omitted, strings/numbers as JSON emits them. Hash: SHA-256 over the
 * UTF-8 bytes, lowercase hex. Async because it uses Web Crypto
 * (`globalThis.crypto.subtle`), available in every runtime the protocol
 * targets.
 */
import type { AppTheme } from '../schemas/app-theme.js';
/** The attested part of an overlay — never `mode`, `name`, `frameless`, nor the declared assets `fonts` / `imagery` (ggui#1093). */
export type OverlayHashInput = Pick<AppTheme, 'overlays' | 'cssVariables' | 'keyframes'>;
/** The canonical JSON the hash is taken over — exported so tests and other minters can pin it. */
export declare function canonicalOverlayJson(input: OverlayHashInput): string;
/** `sha256(canonicalOverlayJson(input))` as lowercase hex — the value `AppTheme.overlayHash` carries. */
export declare function canonicalOverlayHash(input: OverlayHashInput): Promise<string>;
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