@rstoenescu ok - thanks I did bring it to work, the term “plugin” was confusing me.

Hi, I am new to quasar and trying as well to add a javascript (log4javascript) and actually I don’t know where exactly to put the lines @rstoenescu . Tried with App.vue but gives error:

ERROR in ./src/App.vue?vue&type=script&lang=js (./node_modules/babel-loader/lib??ref--1-0!./node_modules/vue-loader/lib??vue-loader-options!./src/App.vue?vue&type=script&lang=js)
Module build failed:   SyntaxError: /development/proj/frontend.q/src/App.vue: Unexpected token, expected ";" (9:25)
     7 | 
     8 | import log4javascript from 'log4javascript'
  >  9 | export default ({ Vue }) {
       |                          ^
    10 |   name: 'App',
    11 |   Vue.prototype.$log = log4javascript // then use as this.$_
    12 | }

Could you pls guide me? Thanks and regards