/**
 * Resolves a CSS variable reference to a 6-character hex string at runtime.
 *
 * Uses `getComputedStyle` on `<html>` to read the token value the browser has
 * already computed. Works for any CSS custom property registered on `:root`.
 *
 * @param cssVar - A CSS var() expression, e.g. 'var(--tailwind-colors-blue-700)'.
 * @returns A '#rrggbb' hex string, or null if the variable cannot be resolved
 *          or its value is not a recognisable color format.
 *
 * @example
 * resolveCssVarToHex('var(--tailwind-colors-blue-700)') // → '#1d4ed8'
 * resolveCssVarToHex('#2563eb')                         // → null (not a var())
 * resolveCssVarToHex('var(--unknown)')                  // → null (not defined)
 */
declare const resolveCssVarToHex: (cssVar: string) => string | null;
export default resolveCssVarToHex;