RunKit + npm: elvjs

const { events } = require("elvjs"); const handler = events.on('test-event', console.log); events.fire('test-event', 1); events.fire('test-event', 1, { a: 'a', b: 'b' }); events.fire('test-event', 1, { a: 'a', b: 'b' }, 3); events.off(handler);