/**
 * Determines whether the given string looks like a phone number.
 *
 * @param phoneNumber The string to scrutinize.
 *
 * @example
 * ```js
 * const isPhoneNumber = isPhoneNumber('+1 (555) 123-4567'); // true
 * ```
 *
 * @return Whether or not it looks like a phone number.
 */
export declare function isPhoneNumber(phoneNumber: string): boolean;
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