import { CssRuleWithVariableNames, RawCssRuleWithIndex } from '../../types/css';
/**
 * Searches through a raw CSS rule to find all the references to CSS variables within it.
 * Note: Since this is just parsing the raw CSS text, it cannot fetch the actual values of the variables.
 * Instead, it will return the name of the variable and the property it is applied to.
 *
 * @param {RawCssRuleWithIndex} rule - The CSS rule to search through for variables.
 *
 * @returns {CssRuleWithVariableNames | null} The given rule parameter,
 * but with the name and property of any variables within it added in,
 * as well as all the selectors that are used to define this rule,
 * or null if no variables are found.
 */
export declare const findVariablesInCssRule: ({ rule, indexInStylesheet, }: RawCssRuleWithIndex) => CssRuleWithVariableNames | null;