/**
 * @param array
 * @returns string containing ranges of numbers.
 * @example
 * const range = toRange([1, 2, 3, 12, 6, 7, 5, 27, 28, 29, 40, 41, 25, 42, 12])
 * // range = "1-3 & 5-7 & 12 & 25 & 27-29 & 40-42"
 */
export declare const toRange: (array: number[]) => string;
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