/**
 * Two things the observation path needs and does not decide.
 *
 * Which engine painted a subject is part of a baseline's identity, and
 * promoting one is the acceptance path's last step. Both are here because the
 * fixture module is about wiring a runner's fixtures together, and neither of
 * these knows a runner exists.
 */
import type { Page } from '@playwright/test';
import { documentDigest } from '@variance-authority/core/format';
import type { AccessibilitySnapshot, SemanticSnapshot } from '@variance-authority/core/format';
import type { BaselineKey, RasterStore, Renderer } from '@variance-authority/raster';
export declare function engineOf(page: Page): string;
/**
 * Promote the candidate this run already painted.
 *
 * The image is taken from the render cache rather than rendered again, which is
 * not only a saving: re-rendering here would produce a *second* image and store
 * that one, so the bytes a reviewer approved and the bytes that became the
 * baseline would be two different renders that nobody compared. A cache miss is
 * therefore refused rather than papered over — the cache never throws and is
 * allowed to be cold, and "cold" is exactly the case where there is no candidate
 * to promote.
 */
export declare function promote(store: RasterStore, renderer: Renderer, document: Parameters<typeof documentDigest>[0], key: BaselineKey, 
/** This run's snapshot of the same render. See below. */
snapshot: SemanticSnapshot, accessibility: AccessibilitySnapshot): Promise<void>;
//# sourceMappingURL=promote.d.ts.map