@notifierjs/core

Zero dependencies platform and framework agnostic engine that helps you build your own notifications system.

Table of contents

• Installation
• Usage
  • Creation
  • Subscription
  • Add notification
  • Remove notification
  • Queue
• Options
  • autoRemove
  • autoRemoveTimeout
  • size
• API
• Maintaining
  • Scripts

Installation

Using npm:

npm install @notifierjs/core

Using yarn:

yarn add @notifierjs/core

Usage

Creation

Library exports a single createNotifier factory function which return to you instance of Notifier interface.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier();

Optionally you can pass some options to it(you can view list of all available options here):

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier({ autoRemoveTimeout: 7000 });

Subscription

Then you should subscribe to the two main notifier events: add and remove

const addListener = () => {
  // some `add` logic here
};

const removeListener = () => {
  // some `remove` logic here
};

notifier.subscribe('add', addListener);
notifier.subscribe('remove', removeListener);

This listeners will called whenever add or remove event happened.

If you want to cancel subscription subscribe method return disposer function.

const addListener = () => {
  // some `add` logic here
};

const dispose = notifier.subscribe('add', addListener);

// when you don't need `add` event listener anymore

dispose();

Add notification

To add notification you simply call add method and pass notification config:

notifier.add({ id: nanoid(), payload: { titile: 'Notification', body: 'Hello world!' } });

This will trigger add event and all its event listeners will be executed.

When you add notification it will appear on the notifications property with the folowing properties:

• id - id that you passed to notification in add method
• payload - payload that you passed to notification in add method
• options - options that are specific to this particular notification
• info - additional data about your notification, contains a countdown timer for removing your notification if the following options were passed to the factory function or the notification option in the add method: autoRemove: true and autoRemoveTimeout with any number.

Remove notification

Usually, notifications have the autoRemove option set to true as well as autoRemoveTimeout, but if you wanna manually remove some notification use remove method and pass notification id to it:

const notification = { id: nanoid(), payload: { titile: 'Notification', body: 'Hello world!' } };

notifier.add(notification);

// if you wanna to manually remove this notification

notifier.remove(notification.id);

Remove notification(automatically or manually) will trigger remove event.

Queue

If the number of added notifications exceeds the number that was specified in the option size when creating the instance, then they will be added to the queue. You can manage size of the displayed notifications by passed size option to factory function or setOptions method.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier({ size: 3 });

notifier.add(notification1);
notifier.notifications.length; // 1

notifier.add(notification2);
notifier.notifications.length; // 2

notifier.add(notification3);
notifier.notifications.length; // 3

notifier.add(notification4);
// `notification4` will be added to queue
notifier.notifications.length; // 3

Or by calling setOptions method on the Notifier instance

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier();

notifier.setOptions({ size: 3 });

notifier.add(notification1);
notifier.notifications.length; // 1

notifier.add(notification2);
notifier.notifications.length; // 2

notifier.add(notification3);
notifier.notifications.length; // 3

notifier.add(notification4);
// `notification4` will be added to queue
notifier.notifications.length; // 3

Options

createNotifier factory function can take the following options:

autoRemove

Determines whether the added notification should be removed automatically.

Type	Required	Default
boolean	no	true

autoRemoveTimeout

Determines after what time(in milliseconds) the notification should be removed automatically.

Type	Required	Default
number	no	5000

size

Determines how many notifications can be displayed.

Type	Required	Default
number	no	5

API

notifications

type: LaunchedNotification<Payload>[]

Contains displayed notifications.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

notifier.add({ id: 1, payload: 'Notification 1' });
notifier.add({ id: 2, payload: 'Notification 2' });

console.log(notifier.notifications); // [LaunchedNotification<string>, LaunchedNotification<string>]

options

type: Options

Contains setted options. Read more in options section.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

console.log(notifier.options); // { autoRemove: true, autoRemoveTimeout: 5000, size: 5 }

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>({ autoRemoveTimeout: 7000 });

console.log(notifier.options); // { autoRemove: true, autoRemoveTimeout: 7000, size: 5 }

setOptions

type: (options: Partial<Options>) => void

Set options for the current instance.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier();

notifier.setOptions({ size: 3 });

notifier.add(notification1);
notifier.notifications.length; // 1

notifier.add(notification2);
notifier.notifications.length; // 2

notifier.add(notification3);
notifier.notifications.length; // 3

notifier.add(notification4);
// `notification4` will be added to queue
notifier.notifications.length; // 3

add

type: (notification: PreparedNotification<Payload>) => void

Add notification.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

notifier.notifications.length; // 0

notifier.add({ id: 1, payload: 'Notification 1' });

notifier.notifications.length; // 1

remove

type: (id: string | number) => void

Remove notification.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

notifier.notifications.length; // 0

notifier.add({ id: 1, payload: 'Notification 1' });

notifier.notifications.length; // 1

notifier.remove(1);

notifier.notifications.length; // 0

subscribe

type: (event: NotificationEvent, handler: Handler) => Disposer

Subscribe to notifier events. Return disposer function to unsubscribe from event.

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

notifier.subscribe('add', () => {
  console.log('add event triggered!');
});

notifier.subscribe('remove', () => {
  console.log('remove event triggered!');
});

notifier.add({ id: 1, payload: 'Notification 1' });

// 'add event triggered!'

notifier.remove(1);

// 'remove event triggered!'

import { createNotifier } from '@notifierjs/core';

const notifier = createNotifier<string>();

const unsubscribe = notifier.subscribe('add', () => {
  console.log('add event triggered!');
});

notifier.add({ id: 1, payload: 'Notification 1' });

// 'add event triggered!'

unsubscribe();

notifier.add({ id: 2, payload: 'Notification 2' });

// nothing will be displayed in console

Maintaining

Scripts

List of available scripts to run:

• build — build library
• typecheck — run typescript to check types
• test — run all tests
• test:watch — run all tests in watch mode
• test:coverage — run all tests with code coverage output