Vue Expert JavaScript provides a senior specialist workflow for building Vue 3 applications using vanilla JavaScript and JSDoc type annotations instead of TypeScript. It covers designing component structures, implementing script setup components, writing composables with comprehensive JSDoc coverage, and setting up testing. Use this skill when building Vue 3 applications with JavaScript only, when projects require JSDoc-based type hints without a TypeScript compiler, or when migrating from Vue 2 to the Composition API in JavaScript.