/**
 * Copyright 2020 Google LLC. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ param type1 param type2 ignore export function extend ( type1 , type2 ) { for ( let property in type2 . prototype ) { type1 . prototype [ property ] = type2 . prototype [ property ] ; } } export function abortEvent ( e ) { e = e || window . event ; if ( e . stopPropagation ) { e . stopPropagation ( ) ; } else { e . cancelBubble = true ; } if ( e . preventDefault ) { e . preventDefault ( ) ; } else { e . returnValue = false ; } } export function stopPropagation ( e ) { e = e || window . event ; if ( e . stopPropagation ) { e . stopPropagation ( ) ; } else { e . cancelBubble = true ; } } export function omit ( o , keys ) { const x = { ... o } ; keys . forEach ( ( k ) => delete x [ k ] ) ; return x ; }