To make contributing to Vue.js easier, Vue.js 3.0 is being re-written from the ground up for a cleaner and more maintainable architecture. To do this, the developers are breaking some internal functionalities into individual packages to isolate the scope of complexity. For example, the observer module will be converted to its own package, with its own public API and tests. Check out the Presentation for more details. https://www.bestinterviewquestion.com/vue-js-interview-questions