export type Px = number & {
    readonly __unit: 'px';
};
export type Percent = number & {
    readonly __unit: '%';
};
export declare const px: (value: number) => Px;
export declare const percent: (value: number) => Percent;
export declare const toPercent: (px: Px, container: Px) => Percent;
export declare const toPx: (p: Percent, container: Px) => Px;
export declare const parseSizeAttributeToPercent: (raw: string | number, base: number) => Percent | null;
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