/********************************************************************************
 * Copyright (C) 2018 Ericsson and others.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the Eclipse
 * Public License v. 2.0 are satisfied: GNU General Public License, version 2
 * with the GNU Classpath Exception which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 ********************************************************************************/ export function deepClone < T > ( obj ) { if ( ! obj || typeof obj !== 'object' ) { return obj ; } if ( obj instanceof RegExp ) { return obj ; } const result = Array . isArray ( obj ) ? [ ] : { } ; Object . keys ( obj ) . forEach ( ( key ) => { const prop = ( < any > obj ) [ key ] ; if ( prop && typeof prop === 'object' ) { result [ key ] = deepClone ( prop ) ; } else { result [ key ] = prop ; } } ) ; return result ; } export function deepFreeze < T > ( obj ) { if ( ! obj || typeof obj !== 'object' ) { return obj ; } const stack = [ obj ] ; while ( stack . length > 0 ) { const objectToFreeze = stack . shift ( ) ; Object . freeze ( objectToFreeze ) ; for ( const key in objectToFreeze ) { if ( _hasOwnProperty . call ( objectToFreeze , key ) ) { const prop = objectToFreeze [ key ] ; if ( typeof prop === 'object' && ! Object . isFrozen ( prop ) ) { stack . push ( prop ) ; } } } } return obj ; } const _hasOwnProperty = Object . prototype . hasOwnProperty ; export function notEmpty < T > ( arg ) { return arg !== undefined && arg !== null ; } /**
 * `true` if the argument is an empty object. Otherwise, `false`.
 */ export function isEmpty ( arg ) { return Object . keys ( arg ) . length === 0 && arg . constructor === Object ; }