Size and Performance
- eventemitter3:
eventemitter3
is lightweight (about 1.5 KB minified) but offers more features than some minimalistic emitters. It strikes a good balance between functionality and performance, making it suitable for most applications without significant overhead. - mitt:
mitt
is extremely small (about 200 bytes minified) and provides a very fast event handling mechanism. Its minimalistic design ensures that it has a negligible impact on performance, making it ideal for high-performance applications where every byte and millisecond counts. - nanoevents:
nanoevents
is one of the smallest event emitter libraries (around 500 bytes minified). It is designed for high performance with low memory usage, making it an excellent choice for applications that require quick event handling without the overhead of larger libraries.
API Simplicity
- eventemitter3:
eventemitter3
provides a straightforward API for adding, removing, and emitting events. While it has more features than a basic emitter, its API is still easy to understand and use, making it accessible for developers of all skill levels. - mitt:
mitt
has a very simple and intuitive API that makes it easy to work with. It supports adding and removing listeners, as well as emitting events, all with minimal boilerplate code. Its simplicity is one of its main selling points. - nanoevents:
nanoevents
offers a clean and simple API for event handling. It allows for easy registration and deregistration of listeners, as well as emitting events. The API is designed to be intuitive, making it easy for developers to integrate into their projects.
Feature Set
- eventemitter3:
eventemitter3
supports multiple listeners, once listeners, and context binding, making it a more feature-rich solution compared to minimalistic emitters. It also provides built-in support for removing listeners, which adds to its flexibility and usability in more complex scenarios. - mitt:
mitt
is focused on simplicity and does not support multiple listeners for the same event by default. It allows for a single listener per event, which keeps the API clean but limits its functionality in scenarios where multiple listeners are needed. - nanoevents:
nanoevents
supports multiple listeners and provides a simple way to manage them. However, it does not have advanced features like once listeners or context binding, keeping it lightweight and easy to use while still offering enough functionality for most use cases.
Use Case Example
- eventemitter3:
Use
eventemitter3
when you need a robust event system with support for multiple listeners, once listeners, and context. It is suitable for larger applications where you need more control over event handling and listener management. - mitt:
Use
mitt
for simple event handling where you want to keep things lightweight and straightforward. It is ideal for small to medium projects where you don’t need complex event handling features. - nanoevents:
Use
nanoevents
when you need a fast and lightweight event emitter with support for multiple listeners. It is great for performance-sensitive applications where you want to minimize memory usage and keep the event handling logic simple.
Ease of Use: Code Examples
- eventemitter3:
eventemitter3
Exampleimport EventEmitter from 'eventemitter3'; const emitter = new EventEmitter(); // Add a listener emitter.on('event', () => console.log('Event triggered!')); // Emit the event emitter.emit('event');
- mitt:
mitt
Exampleimport mitt from 'mitt'; const emitter = mitt(); // Add a listener emitter.on('event', () => console.log('Event triggered!')); // Emit the event emitter.emit('event');
- nanoevents:
nanoevents
Exampleimport { Nanoevents } from 'nanoevents'; const emitter = new Nanoevents(); // Add a listener const unsubscribe = emitter.on('event', () => console.log('Event triggered!')); // Emit the event emitter.emit('event'); // Remove the listener unsubscribe();