weak-emitter
v5.2.1
Published
Contexts based event emitter on ES6 WeakMaps
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weak-emitter
Contexts based event emitter on ES6 WeakMaps
const context = {}
const eventKey = 'propName'
emitter.on(context, eventKey, (...args) => console.log(args))
emitter.emit(context, eventKey, 'first', 2, true)
// ['first', 2, true]
Install
npm i weak-emitter --save
# or: yarn add weak-emitter
Emitter API
Argument types:
context: object
eventKey: string | object
handler: (...args: []) => void
on(context, eventKey, handler)
Create new event with eventKey
in context
that will trigger the handler
.
Every handler will be added once, despite the number of times it was added to the event. Handlers are invoked in the order they were added.
Returns an event controller that has three methods:
- emit(...args): trigger handler
- off(): remove event
- tranfer(destination): moves the event to
destination
context
const context = {}
const eventKey = 'propName'
const evController = emitter.on(context, eventKey, (...args) => doSomething(args))
const ctx2 = {}
evController.transfer(ctx2)
evController.off()
emit(context, eventKey[, ...args])
Invoke all handlers in context
tagged with key
, passing the rest of the arguments
const context = {}
const eventKey = 'propName'
emitter.on(context, eventKey, (...args) => console.log(args))
emitter.emit(context, eventKey, 'first', 2, true)
// ['first', 2, true]
off(context, key, handler)
Removes handler
from the event tagged with key
in context
emitter.off(context, eventKey, handler)
Testing
npm test
© 2020 Jacobo Tabernero - Released under MIT License