import type { OperatorFunction } from 'rxjs';
/**
 * Map to an object composed of the provided properties. Uses lodash's pick function and therefore accepts deep
 * property paths
 * @since 1.0.0
 * @kind Operator
 * @param props Properties to pick
 * @throws When the properties input is not an array
 * @returns An empty object if the source is not an object or the properties array is empty,
 * else an object composed of the provided properties, if they exist on the object.
 * @see https://lodash.com/docs/#pick
 * @example
 * import {of} from 'rxjs';
 * import {pickProps} from '@aloreljs/rxutils/operators';
 *
 * const obj = {
 *   foo: {
 *     bar: 1,
 *     qux: 2
 *   },
 *   baz: 3,
 *   bux: 4
 * };
 *
 * of(obj)
 *   .pipe(pickProps(['foo.bar', 'baz']))
 *   .subscribe();
 * // outputs {foo: {bar: 1}, baz: 3}
 */
export declare function pickProps<I extends object, P extends keyof I>(props: P[]): OperatorFunction<I, Pick<I, P>>;
/**
 * Map to an object composed of the provided properties. Uses lodash's pick function and therefore accepts deep
 * property paths
 * @kind Operator
 * @param props Properties to pick
 * @throws When the properties input is not an array
 * @returns An empty object if the source is not an object or the properties array is empty,
 * else an object composed of the provided properties, if they exist on the object.
 * @see https://lodash.com/docs/#pick
 * @example
 * import {of} from 'rxjs';
 * import {pickProps} from '@aloreljs/rxutils/operators';
 *
 * const obj = {
 *   foo: {
 *     bar: 1,
 *     qux: 2
 *   },
 *   baz: 3,
 *   bux: 4
 * };
 *
 * of(obj)
 *   .pipe(pickProps(['foo.bar', 'baz']))
 *   .subscribe();
 * // outputs {foo: {bar: 1}, baz: 3}
 */
export declare function pickProps<I extends object, O = any>(props: PropertyKey[]): OperatorFunction<I, O>;