/** CSS border styles that may be resolved from the themed Page surface. */
export declare const WIDGET_FRAME_RESOLVED_BORDER_STYLES: readonly ["none", "hidden", "dotted", "dashed", "solid", "double", "groove", "ridge", "inset", "outset"];
export type WidgetFrameResolvedBorderStyle = (typeof WIDGET_FRAME_RESOLVED_BORDER_STYLES)[number];
export type WidgetFrameResolvedSrgbColor = {
    colorSpace: "srgb";
    /** Integer sRGB channel in the inclusive range 0-255. */
    red: number;
    /** Integer sRGB channel in the inclusive range 0-255. */
    green: number;
    /** Integer sRGB channel in the inclusive range 0-255. */
    blue: number;
    /** Alpha channel in the inclusive range 0-1. */
    alpha: number;
};
export type WidgetFrameResolvedBorderColor = WidgetFrameResolvedSrgbColor;
export type WidgetFrameResolvedBorder = {
    color: WidgetFrameResolvedSrgbColor;
    style: WidgetFrameResolvedBorderStyle;
    /** Resolved CSS pixel width. */
    widthPx: number;
};
export type WidgetFrameResolvedBorderRadiusCorner = {
    /** Resolved horizontal radius in CSS pixels. */
    horizontalPx: number;
    /** Resolved vertical radius in CSS pixels. */
    verticalPx: number;
};
/** Effective border-box corner radii after relative lengths and overlap scaling. */
export type WidgetFrameResolvedBorderRadius = {
    topLeft: WidgetFrameResolvedBorderRadiusCorner;
    topRight: WidgetFrameResolvedBorderRadiusCorner;
    bottomRight: WidgetFrameResolvedBorderRadiusCorner;
    bottomLeft: WidgetFrameResolvedBorderRadiusCorner;
};
/** One resolved layer from the CSS `box-shadow` list, in declaration order. */
export type WidgetFrameResolvedBoxShadowLayer = {
    color: WidgetFrameResolvedSrgbColor;
    /** Resolved horizontal offset in CSS pixels. */
    offsetXPx: number;
    /** Resolved vertical offset in CSS pixels. */
    offsetYPx: number;
    /** Resolved non-negative blur radius in CSS pixels. */
    blurRadiusPx: number;
    /** Resolved spread radius in CSS pixels. */
    spreadRadiusPx: number;
    inset: boolean;
};
/** Read-only runtime frame appearance state derived from the themed Page surface. */
export type WidgetFrameAppearance = {
    kind: "none";
} | {
    kind: "page";
    border: string;
    borderRadius: string;
    boxShadow: string;
    resolvedBorder?: WidgetFrameResolvedBorder;
    resolvedBorderRadius?: WidgetFrameResolvedBorderRadius;
    /** Omitted when unresolved; an empty list explicitly represents `box-shadow: none`. */
    resolvedBoxShadow?: WidgetFrameResolvedBoxShadowLayer[];
};
export declare function isWidgetFrameAppearance(value: unknown): value is WidgetFrameAppearance;
export declare function areWidgetFrameAppearancesEqual(a: WidgetFrameAppearance | undefined, b: WidgetFrameAppearance | undefined): boolean;
export declare function cloneWidgetFrameAppearance(appearance: WidgetFrameAppearance): WidgetFrameAppearance;
export declare function cloneWidgetFrameAppearance(appearance: WidgetFrameAppearance | undefined): WidgetFrameAppearance | undefined;
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