import type { DocumentNode } from './contracts.js';
/** Pure layout projection. Input nodes and intrinsic source leaves are never mutated. */
export interface LayoutSpec {
    direction: 'horizontal' | 'vertical' | 'grid';
    gap: number;
    padding: number;
    align?: 'start' | 'center' | 'end' | 'stretch';
    sizing?: 'fixed' | 'hug';
    crossSizing?: 'fixed' | 'hug';
    wrap?: boolean;
    crossGap?: number;
    distribute?: 'start' | 'center' | 'end' | 'space-between';
    paddingTop?: number;
    paddingRight?: number;
    paddingBottom?: number;
    paddingLeft?: number;
    columns?: number;
    minWidth?: number;
    maxWidth?: number;
    minHeight?: number;
    maxHeight?: number;
}
export declare function layoutHugAxes(layout?: LayoutSpec | null): {
    width: boolean;
    height: boolean;
};
export interface LayoutChild {
    position?: 'auto' | 'absolute';
    horizontal?: 'fixed' | 'fill';
    vertical?: 'fixed' | 'fill';
    columnSpan?: number;
}
export interface LayoutPlacement {
    nodeId: string;
    x: number;
    y: number;
    width: number;
    height: number;
}
export interface LayoutResult {
    width: number;
    height: number;
    children: LayoutPlacement[];
}
export declare function layoutProblem(value: unknown): string | null;
export declare function layoutChildProblem(properties: DocumentNode['properties']): string | null;
export declare function layoutChild(node: Pick<DocumentNode, 'properties'>): LayoutChild;
export declare const isAbsoluteLayoutChild: (node: Pick<DocumentNode, "properties">) => boolean;
export declare const participatesInLayout: (node: Pick<DocumentNode, "properties">) => boolean;
export declare function applyLayout(node: Pick<DocumentNode, 'width' | 'height'> & {
    layout?: LayoutSpec | null;
    properties?: DocumentNode['properties'];
}, children: readonly DocumentNode[]): LayoutResult;