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 for managing events and facilitating communication between different parts of an application. They provide a way to subscribe to events and respond to them, enabling a decoupled architecture where components can interact without direct references to each other. This is particularly useful in large applications where maintaining clean and manageable code is crucial. Each library offers unique features and performance characteristics, making them suitable for different use cases in event-driven programming.

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eventemitter342,093,9223,38473.4 kB172 years agoMIT
mitt9,155,13011,11426.4 kB202 years agoMIT
nanoevents152,1061,5155.43 kB05 months agoMIT
Feature Comparison: eventemitter3 vs mitt vs nanoevents

Performance

  • eventemitter3:

    EventEmitter3 is optimized for performance, boasting a faster event dispatching mechanism compared to many other libraries. It minimizes overhead by using a direct approach to event handling, making it suitable for applications with high event frequencies.

  • mitt:

    Mitt is designed to be extremely lightweight and fast, with minimal overhead. Its simplicity allows for rapid event handling, making it a great choice for performance-sensitive applications that don't require complex features.

  • nanoevents:

    Nanoevents is one of the smallest event emitter libraries available, focusing on speed and efficiency. Its design allows for quick event dispatching, making it ideal for projects where performance is paramount.

API Complexity

  • eventemitter3:

    EventEmitter3 offers a rich API with methods for adding, removing, and emitting events. While this provides flexibility, it may introduce a slight learning curve for new users. However, its comprehensive documentation helps mitigate this issue.

  • mitt:

    Mitt has a very simple and intuitive API, making it easy to learn and use. It provides only the essential methods for event management, which is beneficial for developers looking for a straightforward solution without extra complexity.

  • nanoevents:

    Nanoevents features a minimalist API that is easy to grasp. It focuses on providing just enough functionality to handle events effectively without overwhelming the user with options.

Memory Usage

  • eventemitter3:

    EventEmitter3 is efficient in memory usage, but its advanced features may lead to higher memory consumption in scenarios with many listeners and events. It's important to manage listeners carefully to avoid memory leaks.

  • mitt:

    Mitt is extremely lightweight, consuming minimal memory due to its simple design. It is particularly advantageous for applications that require a low memory footprint and quick event handling.

  • nanoevents:

    Nanoevents is designed to be memory-efficient, making it suitable for resource-constrained environments. Its small size and efficient event handling contribute to lower memory usage.

Extensibility

  • eventemitter3:

    EventEmitter3 allows for extensibility through its comprehensive API, enabling developers to create custom event handling solutions tailored to specific needs. This makes it a versatile choice for complex applications.

  • mitt:

    Mitt is intentionally minimalistic, which limits extensibility. However, its simplicity can be an advantage for developers who prefer a straightforward event emitter without the need for additional features.

  • nanoevents:

    Nanoevents supports a namespace feature, allowing for a more organized event management system. This extensibility makes it easier to manage related events without cluttering the global event space.

Use Cases

  • eventemitter3:

    EventEmitter3 is well-suited for applications that require high-performance event handling, such as gaming or real-time data processing applications where events are frequent and need to be managed efficiently.

  • mitt:

    Mitt is ideal for smaller applications or scenarios where simplicity and speed are prioritized. It's great for quick prototypes or projects that require basic event handling without additional complexity.

  • nanoevents:

    Nanoevents is perfect for modern web applications that need a lightweight solution for event management. Its namespace feature allows for organized event handling, making it suitable for larger applications that still prioritize performance.

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

    Choose EventEmitter3 if you need a robust and highly performant event emitter with a simple API. It's ideal for applications that require high-frequency event handling and need to manage a large number of listeners efficiently.

  • mitt:

    Choose Mitt for its minimalistic design and ease of use. It's perfect for lightweight applications or when you want a straightforward event emitter without unnecessary overhead.

  • nanoevents:

    Choose Nanoevents if you are looking for a tiny, fast, and modern event emitter that supports namespaces. It's suitable for projects where size is a concern and you need a simple yet effective way to manage events.

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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