declare function castArray<T>(value: null): T[];
declare function castArray<T>(value: undefined): T[];
declare function castArray<T>(value: readonly T[]): readonly T[];
declare function castArray<T>(value: T[]): T[];
declare function castArray<T>(value: NonNullable<T>): T[];

/**
 * Converts the given value to an array if it's not already one, or returns an value as-is if it's not defined (i.e. `null` or `undefined`).
 * @note If the value is already an array, it is returned as-is (same reference).
 *
 * @example
 * ```ts
 * // Returns `[1, 2, 3]`
 * castArrayIfDefined([1, 2, 3])
 *
 * // Returns `[42]`
 * castArrayIfDefined(42)
 *
 * // Returns `null`
 * castArrayIfDefined(null)
 *
 * // Returns `undefined`
 * castArrayIfDefined(undefined)
 * ```
 */
declare function castArrayIfDefined<T>(value: null): null;
declare function castArrayIfDefined<T>(value: undefined): undefined;
declare function castArrayIfDefined<T>(value: readonly T[]): readonly T[];
declare function castArrayIfDefined<T>(value: T[]): T[];
declare function castArrayIfDefined<T>(value: NonNullable<T>): T[];

export { castArrayIfDefined as a, castArray as c };