/**
 * Tests if a url protocol is valid.
 *
 * @param protocol The url protocol.
 *
 * @example
 * ```js
 * const isValid = isValidProtocol( 'https:' ); // true
 * const isNotValid = isValidProtocol( 'https :' ); // false
 * ```
 *
 * @return True if the argument is a valid protocol (e.g. http:, tel:).
 */
export declare function isValidProtocol(protocol: string): boolean;
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