eventemitter3 vs mitt vs nanoevents
Event Emitter Libraries Comparison
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What's Event Emitter Libraries?

Event emitter libraries are essential tools in JavaScript development, allowing for the implementation of the observer pattern, where one or more listeners can subscribe to events emitted by an object. These libraries facilitate communication between different parts of an application, enabling decoupled components to react to events without direct dependencies. They are particularly useful in scenarios involving asynchronous operations, user interactions, or any situation where event-driven architecture is beneficial. Each library offers unique features and performance characteristics, making them suitable for different use cases in web development.

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eventemitter349,273,9493,42573.4 kB172 years agoMIT
mitt10,494,52711,30626.4 kB202 years agoMIT
nanoevents197,7751,5605.43 kB07 months agoMIT
Feature Comparison: eventemitter3 vs mitt vs nanoevents

Performance

  • eventemitter3:

    EventEmitter3 is designed for high performance, making it one of the fastest event emitters available. It minimizes overhead and optimizes memory usage, allowing for efficient handling of a large number of events and listeners without significant performance degradation.

  • mitt:

    Mitt is extremely lightweight and performs well for small to medium-sized applications. Its minimalistic design ensures that it has low overhead, making it suitable for scenarios where performance is critical but complexity is not needed.

  • nanoevents:

    Nanoevents boasts a very small size and is optimized for speed. It is designed to handle events efficiently, making it an excellent choice for performance-sensitive applications where every byte counts.

API Design

  • eventemitter3:

    EventEmitter3 offers a comprehensive API with methods for adding, removing, and emitting events. It supports wildcard events and allows for once-only listeners, providing flexibility for complex event handling scenarios.

  • mitt:

    Mitt features a simple and intuitive API with just three methods: on, off, and emit. This simplicity makes it easy to learn and use, especially for developers looking for a quick solution without the need for extensive documentation.

  • nanoevents:

    Nanoevents provides a clean and straightforward API that is easy to understand. It focuses on the essential methods for event handling, making it accessible for developers who want to implement event-driven architecture without unnecessary complexity.

Memory Usage

  • eventemitter3:

    EventEmitter3 is optimized for memory efficiency, allowing for the handling of numerous listeners without significant memory overhead. This makes it suitable for applications that require a large number of events and listeners.

  • mitt:

    Mitt is designed to be lightweight, resulting in minimal memory usage. It is ideal for small applications or scenarios where memory resources are limited, ensuring that event handling does not lead to bloat.

  • nanoevents:

    Nanoevents has an extremely small memory footprint, making it one of the most memory-efficient event emitters available. This is particularly beneficial for applications that need to maintain performance while managing numerous events.

Use Cases

  • eventemitter3:

    EventEmitter3 is well-suited for complex applications where performance is a critical factor, such as real-time data processing, gaming, or applications with numerous interactive components that require efficient event handling.

  • mitt:

    Mitt is perfect for small to medium-sized projects where simplicity and ease of use are paramount. It is great for quick prototypes or applications that do not require extensive event handling capabilities.

  • nanoevents:

    Nanoevents is ideal for modern web applications that prioritize performance and size. It is particularly useful in scenarios where a lightweight solution is necessary, such as in microservices or serverless architectures.

Extensibility

  • eventemitter3:

    EventEmitter3 allows for extensibility through its robust API, enabling developers to create custom event types and listeners, making it suitable for complex applications that require tailored event handling solutions.

  • mitt:

    Mitt is not designed for extensibility; it focuses on simplicity and ease of use. It is best suited for straightforward applications where advanced features are not required.

  • nanoevents:

    Nanoevents is also minimalistic and does not offer extensive extensibility options. It is designed for developers who want a straightforward event handling solution without the need for additional features.

How to Choose: eventemitter3 vs mitt vs nanoevents
  • eventemitter3:

    Choose EventEmitter3 if you need a robust and high-performance event emitter with a focus on speed and efficiency. It is particularly well-suited for applications that require a large number of events and listeners, as it is optimized for performance and memory usage.

  • mitt:

    Choose Mitt for its simplicity and minimalistic approach. It is ideal for small projects or when you want a lightweight solution without unnecessary complexity. Mitt provides a straightforward API for event handling, making it easy to integrate into any project.

  • nanoevents:

    Choose Nanoevents if you prefer a tiny footprint with a focus on a simple API and high performance. It is designed for modern JavaScript environments and is particularly useful for applications that require a lightweight solution without sacrificing functionality.

Similar Npm Packages to eventemitter3

eventemitter3 is a high-performance event emitter library for JavaScript applications. It provides a simple and efficient way to handle events, allowing developers to create and manage custom events in their applications. With a focus on performance and minimal overhead, eventemitter3 is ideal for applications that require a lightweight and fast event handling solution.

While eventemitter3 is a robust choice, there are several alternatives available that also provide event handling capabilities. Here are a few noteworthy options:

  • mitt is a tiny and fast event emitter library that is designed for simplicity. With a minimal API and no dependencies, mitt allows developers to easily create and manage events without the overhead of more complex libraries. It is particularly well-suited for small to medium-sized applications where a lightweight solution is preferred. If you need a straightforward event emitter that gets the job done without any frills, mitt is an excellent choice.
  • nanoevents is another lightweight event emitter library that focuses on performance and simplicity. With a very small footprint, nanoevents provides a straightforward API for creating and managing events. It is designed to be fast and efficient, making it a great option for applications that require high-performance event handling. If you are looking for an event emitter that is both minimal and effective, nanoevents is worth considering.

To see how eventemitter3 compares with mitt and nanoevents, check out the comparison: Comparing eventemitter3 vs mitt vs nanoevents.

Similar Npm Packages to mitt

mitt is a tiny and efficient event emitter library for JavaScript applications. It provides a simple API for creating and managing events, allowing developers to easily implement event-driven architectures in their applications. With mitt, you can create custom events, listen for them, and trigger them without the overhead of more complex event management systems. Its lightweight nature makes it an excellent choice for projects that require a straightforward solution for event handling.

While mitt is a popular choice, there are alternatives available that also provide event emitter functionality. Here are a couple of noteworthy options:

  • mitt is often mentioned alongside itself due to its simplicity and effectiveness. It allows for a clean and minimalistic approach to event handling, making it easy to integrate into any JavaScript application. The API is straightforward, with methods for on, off, and emit, which cover the essential functionalities needed for event management. This makes mitt a go-to option for developers looking for a no-frills event emitter.
  • nanoevents is another lightweight event emitter library that focuses on performance and simplicity. It offers a similar API to mitt, allowing developers to create event listeners and emit events with ease. One of the distinguishing features of nanoevents is its support for namespaces, which can help organize events better in larger applications. If you are looking for an alternative to mitt that still maintains a minimal footprint while providing additional features, nanoevents is worth considering.

For a comprehensive comparison of these packages, check out the following link: Comparing mitt vs mitt vs nanoevents.

Similar Npm Packages to nanoevents

nanoevents is a tiny and efficient event emitter library for JavaScript applications. It provides a simple API for creating and managing events, making it easy to implement pub/sub patterns in your applications. With its lightweight nature, nanoevents is ideal for projects where performance and minimalism are key considerations. It allows developers to easily subscribe to events, emit them, and manage listeners without the overhead of larger event libraries.

While nanoevents is a great choice for event handling, there are several alternatives in the ecosystem that also provide event emitter functionalities. Here are a few notable ones:

  • eventemitter3 is a robust and high-performance event emitter library that is widely used in JavaScript applications. It offers a familiar API for managing events and is optimized for speed and memory usage. eventemitter3 supports features like wildcard events and allows for easy removal of listeners. If you need a more feature-rich event emitter with excellent performance, eventemitter3 is a solid choice.
  • mitt is a tiny and simple event emitter library that emphasizes minimalism and ease of use. With a very small footprint, mitt provides a straightforward API for subscribing to and emitting events. It is designed for projects that require a lightweight solution without the additional features that come with larger libraries. If you want a no-frills event emitter that gets the job done, mitt is an excellent option.
  • tiny-emitter is another lightweight event emitter library that focuses on simplicity and performance. It provides a minimalistic API for event handling and is easy to integrate into any JavaScript project. tiny-emitter is particularly useful for applications where you want to keep the bundle size small while still having a reliable event handling mechanism.

To see how nanoevents compares with eventemitter3, mitt, and tiny-emitter, check out the comparison: Comparing eventemitter3 vs mitt vs nanoevents vs tiny-emitter.

README for eventemitter3

EventEmitter3

Version npmCICoverage Status

Sauce Test Status

EventEmitter3 is a high performance EventEmitter. It has been micro-optimized for various of code paths making this, one of, if not the fastest EventEmitter available for Node.js and browsers. The module is API compatible with the EventEmitter that ships by default with Node.js but there are some slight differences:

  • Domain support has been removed.
  • We do not throw an error when you emit an error event and nobody is listening.
  • The newListener and removeListener events have been removed as they are useful only in some uncommon use-cases.
  • The setMaxListeners, getMaxListeners, prependListener and prependOnceListener methods are not available.
  • Support for custom context for events so there is no need to use fn.bind.
  • The removeListener method removes all matching listeners, not only the first.

It's a drop in replacement for existing EventEmitters, but just faster. Free performance, who wouldn't want that? The EventEmitter is written in EcmaScript 3 so it will work in the oldest browsers and node versions that you need to support.

Installation

$ npm install --save eventemitter3

CDN

Recommended CDN:

https://unpkg.com/eventemitter3@latest/dist/eventemitter3.umd.min.js

Usage

After installation the only thing you need to do is require the module:

var EventEmitter = require('eventemitter3');

And you're ready to create your own EventEmitter instances. For the API documentation, please follow the official Node.js documentation:

http://nodejs.org/api/events.html

Contextual emits

We've upgraded the API of the EventEmitter.on, EventEmitter.once and EventEmitter.removeListener to accept an extra argument which is the context or this value that should be set for the emitted events. This means you no longer have the overhead of an event that required fn.bind in order to get a custom this value.

var EE = new EventEmitter()
  , context = { foo: 'bar' };

function emitted() {
  console.log(this === context); // true
}

EE.once('event-name', emitted, context);
EE.on('another-event', emitted, context);
EE.removeListener('another-event', emitted, context);

Tests and benchmarks

This module is well tested. You can run:

  • npm test to run the tests under Node.js.
  • npm run test-browser to run the tests in real browsers via Sauce Labs.

We also have a set of benchmarks to compare EventEmitter3 with some available alternatives. To run the benchmarks run npm run benchmark.

Tests and benchmarks are not included in the npm package. If you want to play with them you have to clone the GitHub repository. Note that you will have to run an additional npm i in the benchmarks folder before npm run benchmark.

License

MIT

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