realm-js/examples/NodeInterprocess/listener.js

////////////////////////////////////////////////////////////////////////////
//
// Copyright 2016 Realm Inc.
//
// 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.
//
////////////////////////////////////////////////////////////////////////////

'use strict';

var Realm = require('realm');

let winstonRealm = new Realm({
  path: 'winston.realm'
});

// Register listener to print out log messages at error level
winstonRealm.objects('Log').filtered('level = "error"').addListener((logs, changes) => {
  changes.insertions.map((index) => {
    let log = logs[index];

    // eslint-disable-next-line no-console
    console.log(log.message);
  })
});