/**
 * Checks if string is valid CSS selector
 * @param str{String} - source selector
 * @return {boolean}
 * @see https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_selectors
 * @example
 * // How to check if CSS selector is valid?
 * const selector = "#myElement";
 * const isValid = isSelectorValid(selector);
 * console.log(isValid); // => true
 */
export function isSelectorValid(str: string): boolean;
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