ce

change-emitter

Listen for changes. Like an event emitter that only emits a single event type. Really tiny.

Showing:

Popularity

Downloads/wk

896K

GitHub Stars

53

Maintenance

Last Commit

4yrs ago

Contributors

2

Package

Dependencies

0

Size (min+gzip)

0.4KB

License

MIT

Type Definitions

Tree-Shakeable

No?

Categories

Readme

change-emitter

build status npm version

Listen for changes. Like an event emitter that only emits a single event type. Really tiny.

I extracted this from Redux's createStore() because I found it to be useful in other contexts. Use it where you want the most minimal event subscription implementation possible.

Usage

import { createChangeEmitter } from 'change-emitter'

const emitter = createChangeEmitter()

// Called `listen` instead of `subscribe` to avoid confusion with observable spec
const unlisten = emitter.listen((...args) => {
  console.log(args)
})

emitter.emit(1, 2, 3) // logs `[1, 2, 3]`
unlisten()
emitter.emit(4, 5, 6) // doesn't log

Larger example

Here's a (partial) implementation of Redux's createStore:

const createStore = (reducer, initialState) => {
  let state = initialState
  const emitter = createChangeEmitter()

  function dispatch(action) {
    state = reducer(state, action)
    emitter.emit()
    return action
  }

  function getState() {
    return state
  }

  return {
    dispatch,
    getState,
    subscribe: emitter.listen
  }
}

Rate & Review

Great Documentation0
Easy to Use0
Performant0
Highly Customizable0
Bleeding Edge0
Responsive Maintainers0
Poor Documentation0
Hard to Use0
Slow0
Buggy0
Abandoned0
Unwelcoming Community0
100