mitt

https://github.com/developit/mitt

  • mitt
  • all
  • on
  • off
  • emit ```jsx npm install —save mitt

//

import mitt from ‘mitt’

const emitter = mitt()

// listen to an event emitter.on(‘foo’, e => console.log(‘foo’, e) )

// listen to all events emitter.on(‘*’, (type, e) => console.log(type, e) )

// fire an event emitter.emit(‘foo’, { a: ‘b’ })

// clearing all events emitter.all.clear()

// working with handler references: function onFoo() {} emitter.on(‘foo’, onFoo) // listen emitter.off(‘foo’, onFoo) // unlisten

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  3. ### ts
  4. ```tsx
  5. import mitt from 'mitt';
  7. type Events = {
  8.   foo: string;
  9.   bar?: number;
  10. };
  12. const emitter = mitt<Events>(); // inferred as Emitter<Events>
  14. emitter.on('foo', (e) => {}); // 'e' has inferred type 'string'
  16. emitter.emit('foo', 42); // Error: Argument of type 'number' is not assignable to parameter of type 'string'. (2345)

PubSubJS

https://github.com/mroderick/PubSubJS

  1. npm install pubsub-js
  3. import PubSub from 'pubsub-js'