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

Event emitter libraries provide a way to handle asynchronous events in JavaScript applications. They allow developers to create and manage event-driven architectures by enabling components to communicate with each other through events. This is particularly useful in scenarios where decoupling components is desired, leading to more maintainable and scalable code. Each of the listed libraries offers unique features and performance characteristics, making them suitable for different use cases in web development.

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eventemitter342,805,7693,38773.4 kB172 years agoMIT
emittery28,275,8951,90547.5 kB14a month agoMIT
mitt9,268,41511,12026.4 kB202 years agoMIT
nanoevents149,9551,5165.43 kB05 months agoMIT
Feature Comparison: eventemitter3 vs emittery vs mitt vs nanoevents

Performance

  • eventemitter3:

    EventEmitter3 is known for its exceptional performance, particularly in high-throughput environments. It minimizes the overhead associated with event handling, ensuring that applications remain responsive even under heavy load.

  • emittery:

    Emittery is designed for performance, supporting high-frequency events with minimal overhead. It allows for efficient event handling even in complex applications, making it suitable for performance-critical scenarios.

  • mitt:

    Mitt is extremely lightweight and fast, making it ideal for scenarios where performance is paramount. Its minimalistic design ensures that it incurs little overhead, allowing for quick event dispatching.

  • nanoevents:

    Nanoevents is optimized for speed and efficiency, providing a very small footprint while maintaining high performance. It is particularly useful in modern applications where performance and bundle size are critical.

API Design

  • eventemitter3:

    EventEmitter3 has a straightforward API that focuses on simplicity and ease of use. It provides essential methods for adding, removing, and emitting events without unnecessary complexity.

  • emittery:

    Emittery offers a rich API with features like namespaces, once-only listeners, and promise-based event handling, providing a comprehensive solution for complex event management.

  • mitt:

    Mitt features a minimal API that is easy to understand and use. It provides basic methods for event handling, making it suitable for developers who prefer simplicity and clarity in their code.

  • nanoevents:

    Nanoevents provides a very concise API, allowing for quick integration and usage. Its simplicity makes it easy to adopt, especially for developers looking for a no-frills event emitter.

Features

  • eventemitter3:

    EventEmitter3 is focused on performance and simplicity, offering essential features without additional complexity. It is ideal for applications that do not require advanced event management features.

  • emittery:

    Emittery supports advanced features such as event namespaces, once-only listeners, and promise-based event handling, making it suitable for complex applications that require detailed event management.

  • mitt:

    Mitt is designed to be lightweight and straightforward, providing basic event handling capabilities without any additional features, making it perfect for small projects.

  • nanoevents:

    Nanoevents is minimalistic, focusing on core event handling without extra features. It is ideal for projects where simplicity and performance are prioritized.

Use Cases

  • eventemitter3:

    EventEmitter3 is ideal for performance-sensitive applications, such as games or real-time data processing, where high throughput and low latency are essential.

  • emittery:

    Emittery is best suited for larger applications that require a robust event management system with advanced features, such as complex state management and inter-component communication.

  • mitt:

    Mitt is perfect for small to medium-sized projects where a simple event emitter is needed without additional overhead, making it easy to implement and maintain.

  • nanoevents:

    Nanoevents is great for modern web applications where bundle size is a concern, providing a fast and efficient event emitter that integrates seamlessly into various environments.

Community and Maintenance

  • eventemitter3:

    EventEmitter3 has a stable and mature codebase with a solid community. It is well-documented and widely used, ensuring that developers can find support and resources easily.

  • emittery:

    Emittery is actively maintained and has a growing community, providing good support and documentation for developers looking to implement advanced event handling features.

  • mitt:

    Mitt is lightweight and has a small but active community. Its simplicity makes it easy to maintain, and it is often recommended for quick implementations.

  • nanoevents:

    Nanoevents is maintained with a focus on modern JavaScript practices. It has a small community but is appreciated for its efficiency and minimalism.

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

    Select EventEmitter3 for its high performance and minimalistic design. It is suitable for applications where performance is critical, and you need a simple yet efficient event emitter without additional overhead.

  • emittery:

    Choose Emittery if you need a feature-rich event emitter with support for namespaces, once-only listeners, and promise-based event handling. It is ideal for complex applications that require advanced event management capabilities.

  • mitt:

    Opt for Mitt if you prefer a lightweight and straightforward solution. It is perfect for small projects or when you need a simple event emitter without any frills, making it easy to integrate and use.

  • nanoevents:

    Consider Nanoevents if you want a tiny, fast, and efficient event emitter. It is designed for modern JavaScript environments and is great for projects where bundle size is a concern, providing a minimalistic API.

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 emittery

emittery is a lightweight and versatile event emitter library for JavaScript applications. It provides a simple API for managing events, allowing developers to easily create, listen to, and emit events in a decoupled manner. With features like promise-based event handling and support for multiple listeners, emittery is a great choice for projects that require efficient event management.

However, there are several alternatives to emittery that also provide event emitter functionality. Here are a few notable options:

  • eventemitter3 is a fast and efficient event emitter library that is widely used in the JavaScript ecosystem. It offers a simple API for managing events and is optimized for performance, making it suitable for high-frequency event handling. eventemitter3 is a great choice for applications that require a lightweight and performant event system without any additional features or complexity.

  • mitt is another minimalistic event emitter library that focuses on simplicity and ease of use. With a tiny footprint, mitt provides a straightforward API for creating and managing events. It is designed for projects that need a simple event system without the overhead of more complex libraries. If your application requires basic event handling without any frills, mitt is an excellent option.

  • nanoevents is a tiny and efficient event emitter library that emphasizes performance and simplicity. It provides a clean API for managing events and is designed to be extremely lightweight, making it ideal for projects where bundle size is a concern. nanoevents is perfect for applications that need a fast and minimal event system without unnecessary features.

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