### Installing Subscribe Library via npm

Source: https://github.com/kucukkanat/subscribe/blob/master/README.md

This command installs the 'subscribe' library from the npm registry and adds it as a dependency to your project's package.json file.

```Shell
$ npm install --save subscribe
```

--------------------------------

### Basic Usage of Emitter Class in JavaScript

Source: https://github.com/kucukkanat/subscribe/blob/master/README.md

This example illustrates the fundamental operations of the Emitter class, including creating an instance, attaching listeners for specific events ('foo') and all events ('*'), emitting events with data, removing listeners by reference or type, and using the 'once' method for handlers that should only fire a single time.

```js
import {Emitter} from 'subscribe'
// OR
const {Emitter} = require('subscribe')

const eventbus = new Emitter()

// listen to an event
eventbus.on('foo', e => console.log('foo', e) )

// listen to all events
// This will fire first the 'type' event if it exists
eventbus.on('*', (type, e) => console.log(type, e) )

// fire an event
eventbus.emit('foo', { a: 'b' })

// working with handler references:
function onFoo() {}
eventbus.on('foo', onFoo)   // listen
eventbus.off('foo', onFoo)  // unlisten

// remove all listeners for specific event
eventbus.off('foo')

// Fire event listener only once
eventbus.once('knock knock', (data) => console.log("I will be fired only once"))
eventbus.emit('knock knock', null)
// This will not fire
event knock', null)
```

--------------------------------

### Including Subscribe Library via UMD Script Tag

Source: https://github.com/kucukkanat/subscribe/blob/master/README.md

This HTML snippet shows how to include the UMD build of the 'subscribe' library directly in a web page using a script tag, typically for browser environments without a module bundler. The library will be available globally under `window.__Emitter__`.

```html
<script src="https://esm.sh/subscribe"></script>
```

--------------------------------

### Importing Emitter Class in JavaScript

Source: https://github.com/kucukkanat/subscribe/blob/master/README.md

These snippets demonstrate how to import the Emitter class into your JavaScript project using either ES6 module syntax (import) or CommonJS module syntax (require). Choose the method appropriate for your project's module system.

```javascript
// using ES6 modules
import { Emitter } from 'subscribe'
```

```javascript
// using CommonJS modules
var { Emitter } = require('subscribe')
```

--------------------------------

### Using Emitter with Typescript for Event Typing

Source: https://github.com/kucukkanat/subscribe/blob/master/README.md

This snippet demonstrates how to leverage Typescript generics when instantiating the Emitter class to define the expected event names ('foo' | 'bar'). This enables static type checking, allowing the Typescript compiler to catch errors if you attempt to register a listener for an undefined event type ('bar2') before runtime.

```js
import {Emitter} from 'subscribe'
const emitter = new Emitter<'foo' | 'bar'>()
emitter.on('foo', e => console.log('foo', e) )
emitter.on('bar', e => console.log('foo', e) )
// Will throw an error: (on typescript typecheck NOT ON RUNTIME!)
emitter.on('bar2', e => console.log('foo', e) )
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.