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node-red/packages/node_modules/@node-red/util/lib/events.js

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/*!
* Copyright JS Foundation and other contributors, http://js.foundation
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*
* 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.
**/
/**
* Runtime events
* @mixin @node-red/util_events
*/
const events = new (require("events")).EventEmitter();
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const deprecatedEvents = {
"nodes-stopped": "flows:stopped",
"nodes-started": "flows:started"
}
function wrapEventFunction(obj,func) {
events["_"+func] = events[func];
return function(eventName, listener) {
if (deprecatedEvents.hasOwnProperty(eventName)) {
const log = require("@node-red/util").log;
const stack = (new Error().stack).split("\n")[2].split("(")[1].slice(0,-1);
log.warn(`[RED.events] Deprecated use of "${eventName}" event from "${stack}". Use "${deprecatedEvents[eventName]}" instead.`)
}
return events["_"+func].call(events,eventName,listener)
}
}
events.on = wrapEventFunction(events,"on");
events.once = wrapEventFunction(events,"once");
events.addListener = events.on;
module.exports = events;
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/**
* Runtime events emitter
* @mixin @node-red/util_events
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*/
/**
* Register an event listener for a runtime event
* @name on
* @function
* @memberof @node-red/util_events
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* @param {String} eventName - the name of the event to listen to
* @param {Function} listener - the callback function for the event
*/
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/**
* Emit an event to all of its registered listeners
* @name emit
* @function
* @memberof @node-red/util_events
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* @param {String} eventName - the name of the event to emit
* @param {any} ...args - the arguments to pass in the event
* @return {Boolean} - whether the event had listeners or not
*/