Vue 2.1

Vue 2.1 extended the Vue 2.0 line with the official vue-server-renderer package for server-side rendering, including server-rendered component output and client-side hydration. It also added functional components for lightweight, stateless rendering and scoped slots, allowing child components to expose data for slot content supplied by their parents. These capabilities expanded the component and rendering model without changing Vue 2’s core options-based application structure.

Vue 2.1 has reached end of life. It no longer receives maintenance fixes, security fixes, or compatibility work, and its ecosystem assumptions are substantially behind current browsers, build tooling, Node.js versions, and Vue packages. Remaining on 2.1 also leaves an application before later Vue 2 compatibility improvements and makes a future Vue 3 migration harder: old slot patterns, server-rendering integration, dependencies, test tooling, and custom render-function code may all require separate remediation.

Treat migration as a staged upgrade rather than attempting to modernize dependencies around Vue 2.1 in place. Inventory Vue plugins, browser targets, build tools, SSR usage, render functions, functional components, and scoped-slot contracts; then add or strengthen automated component, integration, and hydration tests before changing versions. Upgrade through the later Vue 2 line first, resolving its migration warnings and replacing unmaintained plugins, then use the Vue 3 migration guidance and compatibility tooling where applicable. If server-side rendering is used, plan it as a dedicated workstream because the modern Vue SSR stack and application entry structure differ from the Vue 2.1 renderer.