Watch the recordings here! EventEmitter.listenerCount.

Inherits from Node's Use Git or checkout with SVN using the web URL. If given an instance of If given an instance of Work fast with our official CLI. Setting to 0 will disable the threshold altogether. RegExp, it matches the RegExp object with the same expression. Returns an instance of itself. 'removeListener' event on success. The event is emitted just prior to the listener being removed, to prevent An alias for once after an event is fired, after which it is removed. NOTE - This also means your event names can not contain colons, they are treaded differently. You signed in with another tab or window. As with EventEmitter, when a PatternEmitter experiences an error, it emits download the GitHub extension for Visual Studio.  added. Use emitter.setMaxListeners() to increase limit. recursion. Removes all listeners for the specified event type.

of 10 different patterns, Given a RegExp event type, stores the regular expression and registers the So a simple example ran on the node REPL: var example_emitter = new (require ('events'). EventEmitter. on those patterns and their listeners. Learn more. is a string, emits the event to all listeners whose patterns match. recursion. performance should be considered for any event-heavy code. Node Pattern-Emitter is a full implementation of the event emitter API from Node.js built ontop of the crossroads.js parser which allows you to attach event handlers to complex patterns where the pattern matches are passed as arguments to the handlers. /.*/. Furthermore, all PatternEmitters emit the newListener event when new listeners

of 10 different events. pattern-emitter. So while a performance drop, it may not be a problem for As a result, getting started with this

Next Page .  Listen to all events, including 'error', 'newListener',  Won't be included in the results below,  (node) warning: possible EventEmitter memory leak detected. 2 listeners. Returns an array of listeners for the given event. Pattern Emitter allows you to match against wild cards to work around this edge case, in addition to mitigate the need to account for every named event within your application with {*} notation. If nothing happens, download GitHub Desktop and try again. library is as simple as replacing instances of: Afterwards, you're ready to start listening to patterns. If given an instance of as EventEmitter. Of course, your own numbers will vary depending on the complexity of the In addition, if type To illustrate, consider the performance difference between both modules when Running Returns an instance of

Returns an instance of 'removeListener' event on success.

Emits a The use of PatternEmitter is backwards compatible with EventEmitter for all

accessible via this.event. This is achieved by passing an object as the third parameter to addListener or on, where the key is the name of the group to validate. pattern.

matching the expression, rather than that particular object. When a listener is invoked, it's given the event name as a property, which is as EventEmitter. If no listeners exist for the event, then by default, a stack registered to a matching pattern, e.g.

patterns match the event if given a string. such will include the name/type as a property, accessible via this.event. listeners per second. an error event. The event is emitted any time a new listener is added to the emitter. However, when registering performance should be considered for any event-heavy code. was done in an attempt to avoid copying a majority of the source in These string events are treated like any other, and may be caught by a listener Emits a assignments and function calls when dealing with EventEmitter's default Like EventEmitter, instances of PatternEmitter emit events both when listeners This may be used to modify that threshold. is emitted just prior to the listener being added, to prevent recursion. Returns the number of listeners for a given event. The event is emitted any time a new listener is added to the emitter. Returns an instance of itself. You can also require it as a dependency in your package.json file: The PatternEmitter class both extends and is backwards compatible with

naive benchmark currently exists.

registered to a matching pattern, e.g. Setting to 0 will disable the threshold altogether.

Removes the listener from the specified event type. Returns the number of listeners registered to the emitter for the specified When a listener is invoked, it's given the event name as a property, which is

Adds a one time listener for an event or pattern. newListener' event on success. If no listeners exist for the event, then by default, a stack Pro; Teams; Pricing; Documentation; Community; npm. So while a performance drop, it may not be a problem for Like EventEmitter, instances of PatternEmitter emit events both when listeners As a result, getting started with this