Capillaries

Javascript Events and Hooks

Getting Started

Installation

Installation can be done via package managers such as npm or yarn

% npm install capillaries

# or

% yarn add capillaries

Events

import { Events } from 'capillaries';

const event = new Events();

const listener = function (payload) {
  console.log('Event Received:', payload);
};

// create a event listeners
event.on('connecting', listener);
event.on('connected', listener, this); // optionally bind context to the listener when invoked

// listen to all events
event.on('*', (type, payload) => {});

// dispatch events
event.emit('connected', 'paylod');

// remove a event listener
const unsubscribe = event.on('connected', listener);
unsubscribe();

// remove all listeners for given event
event.unbindAll('connected');

// unbind all event listeners
event.unbindAll();

AsyncEvents

import { AsyncEvents } from 'capillaries';

const event = new AsyncEvents();

const handler = async function (payload) {
  console.log('Event Received:', payload);
};

// create a event handler
event.on('connected', handler);

// call the event
await event.call('connected', 'paylod');

// remove a event listener
const unsubscribe = event.on('connected', handler);
unsubscribe();

// unbind/remove all events
event.unbindAll();

Only one event handler can be attached per event. Attaching more than one event will throw an error.

Hooks

import { Hooks } from 'capillaries';

const hooks = new Hooks();

// create a tap
hooks.tap('Hook', () => {
  return 'Hello World!';
});

hooks.tap('AsyncHook', async () => {
  return 'Hello World!';
});

// Call the taps
hooks.call('Hook', payload); //-> returns undefined
hooks.callWaterFall('Hook', payload); //-> returns 'Hello World!'
hooks.callAsync('AsyncHook', payload); // awaits on taps, returns undefined
hooks.callAsyncWaterFall('AsyncHook', payload); // awaits on taps, returns 'Hello World!'

// remove all hooks
hooks.clear();

Hooks are executed in order. The calling waterfall hook passes a return value from each function to the next function and returns data from the last tap

Browser compatibility

• Chrome 38+
• Edge 12+
• Firefox 13+
• Opera 25+
• Safari 8+
• Internet Explorer 11