export declare type Pos = {
    x: number;
    y: number;
};
export declare type Size = {
    width: number;
    height: number;
};
export declare type Box = Size & Pos;
export declare type BoxEdges = {
    left: number;
    right: number;
    top: number;
    bottom: number;
};
export declare const ZERO_EDGES: Readonly<BoxEdges>;
/**
 * Computes an inner box by subtracting the given space (e.g. a padding) from the given box.
 *
 * @param box The outer box.
 * @param edges The space to subtract.
 * @returns The resulting inner box.
 */
export declare function subtractEdges(box: Box, edges: BoxEdges): {
    x: number;
    y: number;
    width: number;
    height: number;
};
/**
 * Parses a given value as a box lengths definition (`BoxLengths | Length`) to the lengths of the
 * edges.
 * Throws if the given input is invalid.
 *
 * @param input the input value
 * @returns an object with the four edges in `pt`, or `undefined` if the input is missing or `null`
 */
export declare function parseEdges(input: unknown): BoxEdges;
/**
 * Converts a length definition into the corresponding value in points (`pt`).
 * Throws if the given value is not a valid length.
 *
 * @param input the input value
 * @returns the length in `pt`, or `undefined` if the input is missing or `null`
 */
export declare function parseLength(input: unknown): number;