/**
 * Checks if the string is blank (has no non-space content).
 *
 * @since 11.0.0
 * @category Lang
 * @param string String to use.
 * @returns If the string is blank.
 * @example
 * isBlank("")
 * // => true
 *
 * isBlank("  ")
 * // => true
 *
 * isBlank(" foo ")
 * // => false
 */
export declare const isBlank: (string: string) => boolean;
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