import { PlainObject } from './validator.functions';
/**
 * Utility function library:
 *
 * addClasses, copy, forEach, forEachCopy, hasOwn, mergeFilteredObject,
 * uniqueItems, commonItems, fixTitle, toTitleCase
*/
/**
 * 'addClasses' function
 *
 * Merges two space-delimited lists of CSS classes and removes duplicates.
 *
 * // {string | string[] | Set<string>} oldClasses
 * // {string | string[] | Set<string>} newClasses
 * // {string | string[] | Set<string>} - Combined classes
 */
export declare function addClasses(oldClasses: string | string[] | Set<string>, newClasses: string | string[] | Set<string>): string | string[] | Set<string>;
/**
 * 'copy' function
 *
 * Makes a shallow copy of a JavaScript object, array, Map, or Set.
 * If passed a JavaScript primitive value (string, number, boolean, or null),
 * it returns the value.
 *
 * // {Object|Array|string|number|boolean|null} object - The object to copy
 * // {boolean = false} errors - Show errors?
 * // {Object|Array|string|number|boolean|null} - The copied object
 */
export declare function copy(object: any, errors?: boolean): any;
/**
 * 'forEach' function
 *
 * Iterates over all items in the first level of an object or array
 * and calls an iterator funciton on each item.
 *
 * The iterator function is called with four values:
 * 1. The current item's value
 * 2. The current item's key
 * 3. The parent object, which contains the current item
 * 4. The root object
 *
 * Setting the optional third parameter to 'top-down' or 'bottom-up' will cause
 * it to also recursively iterate over items in sub-objects or sub-arrays in the
 * specified direction.
 *
 * // {Object|Array} object - The object or array to iterate over
 * // {function} fn - the iterator funciton to call on each item
 * // {boolean = false} errors - Show errors?
 * // {void}
 */
export declare function forEach(object: any, fn: (v: any, k?: string | number, c?: any, rc?: any) => any, recurse?: boolean | string, rootObject?: any, errors?: boolean): void;
/**
 * 'forEachCopy' function
 *
 * Iterates over all items in the first level of an object or array
 * and calls an iterator function on each item. Returns a new object or array
 * with the same keys or indexes as the original, and values set to the results
 * of the iterator function.
 *
 * Does NOT recursively iterate over items in sub-objects or sub-arrays.
 *
 * // {Object | Array} object - The object or array to iterate over
 * // {function} fn - The iterator funciton to call on each item
 * // {boolean = false} errors - Show errors?
 * // {Object | Array} - The resulting object or array
 */
export declare function forEachCopy(object: any, fn: (v: any, k?: string | number, o?: any, p?: string) => any, errors?: boolean): any;
/**
 * 'hasOwn' utility function
 *
 * Checks whether an object or array has a particular property.
 *
 * // {any} object - the object to check
 * // {string} property - the property to look for
 * // {boolean} - true if object has property, false if not
 */
export declare function hasOwn(object: any, property: string): boolean;
/**
 * Types of possible expressions which the app is able to evaluate.
 */
export declare enum ExpressionType {
    EQUALS = 0,
    NOT_EQUALS = 1,
    NOT_AN_EXPRESSION = 2
}
/**
 * Detects the type of expression from the given candidate. `==` for equals,
 * `!=` for not equals. If none of these are contained in the candidate, the candidate
 * is not considered to be an expression at all and thus `NOT_AN_EXPRESSION` is returned.
 * // {expressionCandidate} expressionCandidate - potential expression
 */
export declare function getExpressionType(expressionCandidate: string): ExpressionType;
export declare function isEqual(expressionType: any): boolean;
export declare function isNotEqual(expressionType: any): boolean;
export declare function isNotExpression(expressionType: any): boolean;
/**
 * Splits the expression key by the expressionType on a pair of values
 * before and after the equals or nor equals sign.
 * // {expressionType} enum of an expression type
 * // {key} the given key from a for loop iver all conditions
 */
export declare function getKeyAndValueByExpressionType(expressionType: ExpressionType, key: string): string[];
export declare function cleanValueOfQuotes(keyAndValue: any): String;
/**
 * 'mergeFilteredObject' utility function
 *
 * Shallowly merges two objects, setting key and values from source object
 * in target object, excluding specified keys.
 *
 * Optionally, it can also use functions to transform the key names and/or
 * the values of the merging object.
 *
 * // {PlainObject} targetObject - Target object to add keys and values to
 * // {PlainObject} sourceObject - Source object to copy keys and values from
 * // {string[]} excludeKeys - Array of keys to exclude
 * // {(string: string) => string = (k) => k} keyFn - Function to apply to keys
 * // {(any: any) => any = (v) => v} valueFn - Function to apply to values
 * // {PlainObject} - Returns targetObject
 */
export declare function mergeFilteredObject(targetObject: PlainObject, sourceObject: PlainObject, excludeKeys?: string[], keyFn?: (key: string) => string, valFn?: (val: any) => any): PlainObject;
/**
 * 'uniqueItems' function
 *
 * Accepts any number of string value inputs,
 * and returns an array of all input vaues, excluding duplicates.
 *
 * // {...string} ...items -
 * // {string[]} -
 */
export declare function uniqueItems(...items: any[]): string[];
/**
 * 'commonItems' function
 *
 * Accepts any number of strings or arrays of string values,
 * and returns a single array containing only values present in all inputs.
 *
 * // {...string|string[]} ...arrays -
 * // {string[]} -
 */
export declare function commonItems(...arrays: any[]): string[];
/**
 * 'fixTitle' function
 *
 *
 * // {string} input -
 * // {string} -
 */
export declare function fixTitle(name: string): string;
/**
 * 'toTitleCase' function
 *
 * Intelligently converts an input string to Title Case.
 *
 * Accepts an optional second parameter with a list of additional
 * words and abbreviations to force into a particular case.
 *
 * This function is built on prior work by John Gruber and David Gouch:
 * http://daringfireball.net/2008/08/title_case_update
 * https://github.com/gouch/to-title-case
 *
 * // {string} input -
 * // {string|string[]} forceWords? -
 * // {string} -
 */
export declare function toTitleCase(input: string, forceWords?: string | string[]): string;