/**
 * Quality values, or q-values and q-factors, are used to describe the order
 * of priority of values in a comma-separated list.
 * It is a special syntax allowed in some HTTP headers and in HTML.
 * https://developer.mozilla.org/en-US/docs/Glossary/Quality_values
 * @param headerValue
 */
export declare function getByQualityPriorityValue(headerValue: string | undefined | null): string;