BoomProvder.js

const { ServiceProvider } = require('@adonisjs/fold')
class BoomProvider extends ServiceProvider {
  register () {
    this.app.bind('Adonis/Middleware/Boom', app => {
      const BoomMiddleware = require('./middleware')

      return new BoomMiddleware()
    })
  }
}

module.exports = BoomProvider

middleware.js

class BoomMiddleware {
  async handle (request, response) {
    console.log('wtf')
  }
}

module.exports = BoomMiddleware