What is instant prototyping?

In Vue CLI, Instant prototyping is known as rapid prototyping with just a single *.vue file with the vue serve( similar to vue create) and vue build commands. But you need to install below global addon for this.

npm install -g @vue/cli-service-global
# or
yarn global add @vue/cli-service-global

You can also provide entry component for vue serve and target file for vue build using below commands

vue serve MyComponent.vue
vue build MyComponent.vue