/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */ /**
 * Remove duplicate items from a list.
 */ export function removeDuplicates < T > ( items , hash ? ) { if ( hash ) { const seen = new Set ( ) ; return items . filter ( x => { const itemHash = hash ( x ) ; if ( seen . has ( itemHash ) ) return false ; seen . add ( itemHash ) ; return true ; } ) ; } return [ ... new Set ( items ) ] ; } export default removeDuplicates ;