/**
 * Computes a CSS size expression (var(), %, rem, calc(), etc.) relative to the given host element.
 * @param {HTMLElement} host - The element whose coordinate system and CSS variables should be used to resolve the expression.
 * @param {string} expression - The CSS expression to evaluate.
 * @returns {number} The resolved pixel value.
 */
export declare function computeCssSize(host: HTMLElement, expression: string): number;
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