feat(rollup-plugin): expose version (#5194)

* feat(rollup-plugin): expose version

* test(rollup-plugin): exposes plugin version

* chore: add comment

---------

Co-authored-by: Dale Bustad <dale@divmain.com>

Author: cardoso

packages/@lwc/rollup-plugin/src/__tests__/index.spec.ts

@@ -0,0 +1,7 @@
+import lwc from '@lwc/rollup-plugin';
+import { test, expect } from 'vitest';
+
+test('exposes plugin version', () => {
+    const plugin = lwc();
+    expect(plugin.version).toMatch(/^\d+\.\d+\.\d+/);
+});

packages/@lwc/rollup-plugin/src/index.ts

@@ -182,7 +182,8 @@ export default function lwc(pluginOptions: RollupLwcOptions = {}): Plugin {
 
     return {
         name: PLUGIN_NAME,
-
+        // The version from the package.json is inlined by the build script
+        version: process.env.LWC_VERSION,
         buildStart({ input }) {
             if (rootDir === undefined) {
                 if (Array.isArray(input)) {