Vue 2.4

Vue 2.4 added $attrs and $listeners, giving wrapper and higher-order components access to attributes and event listeners that were not declared as props or handled locally. It also added object syntax for v-on, the .passive event modifier, and server-side stream rendering through the server renderer. These additions improved component forwarding, event binding, and server-rendering options while remaining within the Vue 2 API model.

Vue 2.4 has reached end of life and receives no upstream fixes. A team remaining on it must carry the risk of unresolved defects and vulnerabilities discovered after support ended, along with growing incompatibility risk in browsers, Node-based build tooling, test tooling, and third-party packages. Its age also makes upgrades harder: dependencies and internal application conventions may continue to accumulate assumptions around obsolete Vue 2 behavior, increasing the eventual migration scope.

Inventory every application, shared component library, plugin, server-rendered entry point, and build dependency that is tied to Vue 2.4. Lock the current environment long enough to create a reliable regression suite, with coverage for component attribute and listener forwarding, event modifiers, custom component events, and any server-rendering path. Select a supported target rather than treating a later Vue 2 release as the final destination. For a move to Vue 3, use the compatibility build where appropriate, address its reported compatibility issues, and migrate shared libraries before dependent applications. Audit Vue 2 patterns that require redesign in Vue 3, especially component event APIs, v-model usage, filters, render functions, and dependencies that rely on undocumented internals. Deploy the migration in tested increments and remove compatibility-mode dependencies once the affected code has been converted.