import type { SpaceToken } from '../contracts/tokens.js';
/** SurfaceGroup marker + private spacing token (REQ-MAT-25). */
export declare function surfaceGroupAttributes(spacing: SpaceToken | undefined): {
    'data-ag-group': '';
    'data-ag-spacing'?: SpaceToken;
};
/** Opt-in pointer light host (REQ-MOT-40). */
export declare function pointerLightAttributes(on: boolean | undefined): {
    'data-ag-pointer-light'?: '';
};
/** Subtree preference scope: density / motion written on a component root. */
export declare function preferenceScopeAttributes(scope: {
    density?: 'compact' | 'regular' | 'spacious' | undefined;
    motion?: 'full' | 'calm' | 'none' | undefined;
}): {
    'data-ag-density'?: 'compact' | 'regular' | 'spacious';
    'data-ag-motion'?: 'full' | 'calm' | 'none';
};
/** data-ag-animating while an element runs a material/motion transition. */
export declare function setAnimating(el: Element, on: boolean): void;
/** REQ-CMP-42: a nested transient surface (a moving indicator) takes its own
    glass while it moves: data-ag-animating plus data-ag-allow-nested, so the
    nesting rules in material.css keep its backdrop optics; both are removed at
    rest, where it falls back to the parent's inner fill. */
export declare function setMovingOptics(el: Element, on: boolean): void;
/** View-transition participant marker read by the motion seam (REQ-MOT view transitions). */
export declare function viewTransitionParticipantAttributes(): {
    'data-ag-vt-participant': '';
};
/** Modal scrim layer (REQ-CMP-79): the scrim material layer is MAT-set, overlays only place it. */
export declare function scrimLayerAttributes(): {
    'data-ag-layer': 'scrim';
};
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