This note refers to the implementation of controllers in ALICE O2 Bookkeeping

// lib/server/controllers/about.controller.js

const dbInfo = async (request, response) => {
	...
}

module.exports = {
	dbInfo
}

Export the controller in controllers/index.js:

// lib/server/controllers/index.js
const AboutController = require('./about.controller')

module.exports = {
	AboutController,
	...
}

Define a router, ensuring that the controller field in module.exports is a callable. Because you imported with the object notation, you can access the exports as fields of AboutController. See CommonJS require() and module.exports.

// lib/server/routers/about.router.js
const { AboutController } = require('../controllers');

module.exports = {
	method: 'get',	
	path: 'about',
	controller: AboutController.dbInfo,
	args: { public: true },
};