I have developed a production vue js app without any building tools.(!) Keep in mind that you should not do so. Some community vue component expect babel helps to transform their es6 code for IE11. Besides, you cant do code splitting, which is an issue when you have many small components to be loaded in the same time.
I suggest create your actual project with vue-cli once you get familiar with the vue syntax.
I suggest create your actual project with vue-cli once you get familiar with the vue syntax.