Event handling.ts

// handlers.ts
export function sendEmail(data: EmailData) {
	// send email
}

//events.ts
emitter.on('user_registration', sendEmail)
emitter.on('shop_registration', sendEmail)


// controllers.ts

app.post('/create_user', (req,res) => {
	...
	emitter.emit('user_registration', {
	title: 'Welcome',
	object: 'Welcome again',
	email: '..'
	});
})

app.post('/create_shop', (req,res) => {
	...
	emitter.emit('shop_registration', {
	title: 'Welcome',
	object: 'Welcome again',
	email: '..'
	});
})