import type { AnyFunction, AnyObject, Lazy } from './types';
/**
 * const value = lazyValue(() => expensiveComputation())
 *
 * value() // calls expensiveComputation() once
 * value() // returns cached result
 * value() // returns cached result
 *
 * Based on: https://github.com/sindresorhus/lazy-value
 */
export declare function _lazyValue<T>(fn: () => T): Lazy<T>;
/**
 * interface Obj {
 *   v: number
 * }
 *
 * const obj = {} as Obj
 *
 * _defineLazyProperty(obj, 'v', () => expensiveComputation())
 * obj.v // runs expensiveComputation() once
 * obj.v // cached value
 * obj.v // cached value
 *
 * Based on: https://github.com/sindresorhus/define-lazy-prop
 */
export declare function _defineLazyProperty<OBJ extends AnyObject>(obj: OBJ, propertyName: keyof OBJ, fn: AnyFunction): OBJ;
/**
 * Like _defineLazyProperty, but allows to define multiple props at once.
 */
export declare function _defineLazyProps<OBJ extends AnyObject>(obj: OBJ, props: Partial<Record<keyof OBJ, AnyFunction>>): OBJ;
/**
 * Same as Object.defineProperty, but with better (least restricting) defaults.
 *
 * Defaults are:
 * writable: true
 * configurable: true
 * enumerable: true
 * value: existing obj[prop] value
 *
 * Original defaults:
 * writable: false
 * configurable: false
 * enumerable: false
 * value: existing obj[prop] value
 *
 */
export declare function _defineProperty<T extends AnyObject>(obj: T, prop: keyof T, pd: PropertyDescriptor): T;
/**
 * Object.defineProperties with better defaults.
 * See _defineProperty for exact defaults definition.
 */
export declare function _defineProps<T extends AnyObject>(obj: T, props: Partial<Record<keyof T, PropertyDescriptor>>): T;
/**
 * Like _defineProps, but skips props with nullish values.
 */
export declare function _defineNonNullishProps<T extends AnyObject>(obj: T, props: Partial<Record<keyof T, PropertyDescriptor>>): T;