import { UnitBase } from './abstract-unit-base';
import { KOf, UnitConfig } from '../models';
import { Selection } from './selection';
/**
 * Base for non-primitive Units.
 *
 * - NonPrimitiveUnitBase extends {@link UnitBase}
 * - Which further extends {@link Base} and `Observable`
 *
 * @category 2. Abstract
 */
export declare abstract class NonPrimitiveUnitBase<T, K extends KOf<T> = KOf<T>, V extends T[K] = T[K]> extends UnitBase<T> {
    protected constructor(config?: UnitConfig<T>);
    /**
     * Returns the names of the properties of the current {@link value} using `Object.keys`. \
     *
     * In case of a GenericUnit,
     * if current {@link value} is null or undefined, it returns an empty `array`, \
     * where `Object.keys` would have failed.
     *
     * @category Common List/Dict/Generic Units
     */
    objectKeys(): string[];
    /**
     * Returns an `array` of key/values of the properties of the current {@link value} using `Object.entries`. \
     *
     * In case of a GenericUnit,
     * if current {@link value} is null or undefined, it returns an empty `array`, \
     * where `Object.entries` would have failed.
     *
     * @category Common List/Dict/Generic Units
     */
    objectEntries(): [string, V][];
    /**
     * Returns an `array` of values of the properties of the current {@link value} using `Object.values`. \
     *
     * In case of a GenericUnit,
     * if current {@link value} is null or undefined, it returns an empty `array`, \
     * where `Object.values` would have failed.
     *
     * @category Common List/Dict/Generic Units
     */
    objectValues(): V[];
    select<K1 extends KOf<T>>(k1: K1): Selection<T[K1], this>;
    select<K1 extends KOf<T>, K2 extends KOf<T[K1]>>(k1: K1, k2: K2): Selection<T[K1][K2], this>;
    select<K1 extends KOf<T>, K2 extends KOf<T[K1]>, K3 extends KOf<T[K1][K2]>>(k1: K1, k2: K2, k3: K3): Selection<T[K1][K2][K3], this>;
    select<K1 extends KOf<T>, K2 extends KOf<T[K1]>, K3 extends KOf<T[K1][K2]>, K4 extends keyof T[K1][K2][K3]>(k1: K1, k2: K2, k3: K3, k4: K4): Selection<T[K1][K2][K3][K4], this>;
    select<K1 extends KOf<T>, K2 extends KOf<T[K1]>, K3 extends KOf<T[K1][K2]>, K4 extends keyof T[K1][K2][K3], K5 extends keyof T[K1][K2][K3][K4]>(k1: K1, k2: K2, k3: K3, k4: K4, k5: K5): Selection<T[K1][K2][K3][K4][K5], this>;
    select<K1 extends KOf<T>, K2 extends KOf<T[K1]>, K3 extends KOf<T[K1][K2]>, K4 extends keyof T[K1][K2][K3], K5 extends keyof T[K1][K2][K3][K4]>(k1: K1, k2: K2, k3: K3, k4: K4, k5: K5, ...path: (string | number)[]): Selection<any, this>;
}