spy.js

import { Mongo } from 'meteor/mongo'
import { Meteor } from 'meteor/meteor'

function addConsoleSpyOn({object, methods, spyFn}){
  const oldMethods = methods.reduce((acc,name) => ({...acc, [name]: object[name]}), {})

  methods.forEach(method => {
    object[method] = function(...args){
      spyFn({instance: this, args, method})

      return oldMethods[method].call(this, ...args)
    }
  })
}

addConsoleSpyOn({
  object: Mongo.Collection.prototype,
  methods: ['find', 'findOne', 'update'],
  spyFn({ instance, args, method }){
    console.log(`\n\n${instance._name}.${method} called with ${args.length} args`)
    args.forEach(arg => console.log(arg))
    console.log('\n\n')
  }
})