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

Event emitter libraries are essential tools in JavaScript for implementing the observer pattern, enabling asynchronous communication between different parts of an application. They allow objects to emit events and other objects to listen for those events, facilitating decoupled and modular code. These libraries are particularly useful in scenarios where components need to communicate without being tightly coupled, such as in UI frameworks, state management, and real-time applications. Each library has its unique features, performance characteristics, and use cases, making it important to choose the right one based on project requirements.

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eventemitter353,771,8753,44873.4 kB172 years agoMIT
mitt11,297,71811,44026.4 kB222 years agoMIT
nanoevents242,7581,5785.43 kB09 months agoMIT
signals24,2651,977-1813 years ago-
Feature Comparison: eventemitter3 vs mitt vs nanoevents vs signals

Performance

  • eventemitter3:

    EventEmitter3 is designed for performance, offering a highly optimized event dispatching mechanism that minimizes overhead. It can handle a large number of events and listeners efficiently, making it suitable for high-frequency event scenarios.

  • mitt:

    Mitt is extremely lightweight and fast, with a minimalistic design that ensures low overhead. Its performance is excellent for small to medium-sized applications, although it may not be as optimized for large-scale event handling as some other libraries.

  • nanoevents:

    Nanoevents boasts a very small footprint and is optimized for speed, making it one of the fastest event emitters available. It is particularly effective in performance-sensitive applications where every millisecond counts.

  • signals:

    Signals provide a robust performance profile, particularly in complex applications where event management can become cumbersome. While not as lightweight as some alternatives, it offers a good balance of performance and structure.

API Design

  • eventemitter3:

    EventEmitter3 features a straightforward API that includes methods for adding, removing, and emitting events. Its simplicity allows developers to quickly implement event-driven architectures without a steep learning curve.

  • mitt:

    Mitt has an extremely simple API with just three methods: on, off, and emit. This minimalism is beneficial for developers who want to avoid unnecessary complexity and focus on core functionality.

  • nanoevents:

    Nanoevents offers a clean and intuitive API that allows for both single and multiple listeners. It supports chaining and provides a clear way to manage event subscriptions, making it easy to use and understand.

  • signals:

    Signals provide a more structured API that includes features like strong typing and event management capabilities. This can be beneficial for larger applications where event handling needs to be more organized.

Memory Usage

  • eventemitter3:

    EventEmitter3 is optimized for low memory usage, making it suitable for applications where resource efficiency is critical. Its design minimizes the memory footprint while maintaining performance.

  • mitt:

    Mitt is extremely lightweight, resulting in very low memory consumption. This makes it an excellent choice for small applications or when minimizing bundle size is a priority.

  • nanoevents:

    Nanoevents is designed to be memory-efficient, ensuring that it does not introduce significant overhead even when managing a large number of events and listeners.

  • signals:

    Signals may use slightly more memory due to its structured approach and additional features, but it provides better management capabilities for complex event flows.

Use Cases

  • eventemitter3:

    EventEmitter3 is well-suited for applications that require high-frequency event handling, such as real-time data streaming, gaming, or complex UI interactions where performance is paramount.

  • mitt:

    Mitt is ideal for small to medium-sized applications where simplicity and minimalism are desired. It's perfect for projects that need basic event handling without the overhead of more complex libraries.

  • nanoevents:

    Nanoevents is great for performance-critical applications that require efficient event handling, such as animations, game development, or real-time applications where speed is essential.

  • signals:

    Signals are best for larger applications with complex event management needs, such as state management libraries or frameworks where structured event handling is beneficial.

Extensibility

  • eventemitter3:

    EventEmitter3 is not designed for extensibility but provides a solid foundation for event-driven architectures. Developers can extend its functionality if needed, but it remains focused on performance.

  • mitt:

    Mitt is intentionally minimal and does not offer extensibility features. It is designed for straightforward use cases where additional functionality is not required.

  • nanoevents:

    Nanoevents allows for some level of extensibility, enabling developers to create custom event types and manage listeners effectively, making it flexible for various use cases.

  • signals:

    Signals offer extensibility through a structured approach, allowing developers to create complex event systems and manage dependencies effectively, making it suitable for larger applications.

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

    Choose EventEmitter3 for high-performance applications where you need a lightweight and efficient event emitter with a simple API. It's particularly suitable for scenarios requiring a large number of events and listeners due to its optimized performance.

  • mitt:

    Select Mitt if you need a minimalistic and straightforward event emitter without any dependencies. It's ideal for small projects or when you want to keep your bundle size low while still having a functional event system.

  • nanoevents:

    Opt for Nanoevents when you want a highly efficient and compact event emitter that supports both single and multiple listeners. Its focus on performance and simplicity makes it a great choice for performance-critical applications.

  • signals:

    Use Signals if you prefer a more structured approach to event handling with support for strong typing and better management of event listeners. It's particularly useful in applications where you need to manage complex event flows and dependencies.

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.

Similar Npm Packages to signals

signals is a lightweight event handling library designed for JavaScript applications. It provides a simple and efficient way to create and manage events, allowing developers to implement a publish-subscribe pattern easily. While signals offers a streamlined approach to event handling, there are several alternatives in the ecosystem that provide similar functionalities. Here are a few noteworthy alternatives:

  • eventemitter3 is a fast and lightweight event emitter library for JavaScript. It is an optimized version of the original EventEmitter class from Node.js, designed for performance and efficiency. eventemitter3 supports multiple listeners for events and provides methods for adding, removing, and emitting events. If you need a robust event handling solution with a focus on performance, eventemitter3 is an excellent choice, especially for applications that require high-frequency event handling.
  • mitt is a tiny and simple event emitter library that emphasizes minimalism and ease of use. With a very small footprint, mitt allows you to create an event bus with just a few lines of code. It supports basic event handling features such as adding listeners, emitting events, and removing listeners. If you are looking for a straightforward and lightweight solution for event handling without any additional complexity, mitt is a great option.
  • nanoevents is another minimalistic event emitter library that focuses on simplicity and performance. It provides a clean API for creating event emitters and supports multiple listeners for each event. nanoevents is designed to be small and fast, making it suitable for applications where performance is critical. If you want an efficient and easy-to-use event handling solution, nanoevents is worth considering.

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

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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