/**
 * @module indicative-rules
 */
/**
 * Returns a boolean telling if value is existy or not.
 * Empty string, `null` and `undefined` are not
 * existy.
 *
 * ```js
 * const { is } = require('indicative')
 *
 * is.existy('') // false
 * is.existy(null) // false
 * is.existy(true) // true
 * is.existy(false) // true
 * ```
 */
export declare const existy: (input: any) => boolean;