/**
 * Counts the number of elements in an array or the number of properties in an object.
 *
 * @param {Array<*>|Record<string | number | symbol, any>} obj - The array or object to count.
 * @returns {number} - The count of items (array elements or object keys).
 * @throws {TypeError} If the input is neither an array nor a pure object.
 *
 * @example
 * countObj([1, 2, 3]); // 3
 * countObj({ a: 1, b: 2 }); // 2
 * countObj('not an object'); // Throws TypeError
 */
export declare function countObj(obj: Array<any> | Record<string | number | symbol, any>): number;
/**
 * Determines whether a given value is a pure JSON object (plain object).
 *
 * A pure object satisfies the following:
 * - It is not null.
 * - Its type is "object".
 * - Its internal [[Class]] is "[object Object]".
 * - It is not an instance of built-in types like Array, Date, Map, Set, etc.
 *
 * This function is useful for strict data validation when you want to ensure
 * a value is a clean JSON-compatible object, free of class instances or special types.
 *
 * @param {unknown} value - The value to test.
 * @returns {value is Record<string | number | symbol, unknown>} Returns true if the value is a pure object.
 */
export declare function isJsonObject(value: unknown): value is Record<string | number | symbol, unknown>;
/**
 * Determines whether a given value is a JSON object.
 *
 * A pure object satisfies the following:
 * - It is not null.
 * - Its type is "object".
 * - It is not an Array instance.
 *
 * @param {unknown} value - The value to test.
 * @returns {value is Object<string | number | symbol, unknown>} Returns true if the value is a object.
 */
export declare function isValidObj(value: unknown): value is any;
/**
 * Determines whether the provided value is a class constructor.
 *
 * @reference https://stackoverflow.com/a/30760236
 *
 * @param {unknown} target - The value to be inspected.
 * @returns {boolean} True if the value is a class constructor, false otherwise.
 * @throws {TypeError} If the provided target is not a function.
 */
export declare const isClass: (target: unknown) => boolean;
/**
 * Determines whether a given value is an instance of a custom ES6 class.
 *
 * @param {unknown} value - The value to inspect.
 * @returns {boolean} True if the value is an instance of an ES6 class, false otherwise.
 */
export declare function isClassInstance(value: unknown): boolean;
/**
 * Determines whether a given value is an instance of any class (custom or native).
 * Returns true for instances like Map, Set, URL, Date, Array, and custom ES6 classes.
 * Returns false for primitives, plain objects ({}), and null-prototype objects.
 *
 * @param {unknown} value - The value to inspect.
 * @returns {boolean} True if the value is a class instance, false otherwise.
 */
export declare function isAnyClassInstance(value: unknown): boolean;
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