fix: Derive backoffice bundle cache-bust ?v= from version.json

src/Umbraco.Community.BlockPreview.UI/vite.config.ts

@@ -3,14 +3,20 @@ import { glob } from 'glob';
 import { readFileSync, writeFileSync } from 'fs';
 import { resolve } from 'path';
 
+// Use the project version (version.json at the repo root) as the cache-bust token.
+// It is bumped for every release, so the ?v= query changes each version and browsers
+// re-fetch the entry bundle. Reading public/umbraco-package.json instead left ?v= frozen
+// at a stale value, so upgrades served cached JS.
+function getVersion(): string {
+    const versionJsonPath = resolve(__dirname, '../../version.json');
+    return JSON.parse(readFileSync(versionJsonPath, 'utf-8')).version;
+}
+
 function cacheBustImports(): Plugin {
     return {
         name: 'cache-bust-imports',
         generateBundle(_, bundle) {
-            // Read version from umbraco-package.json
-            const packageJsonPath = resolve(__dirname, 'public/umbraco-package.json');
-            const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf-8'));
-            const version = packageJson.version;
+            const version = getVersion();
 
             for (const file of Object.values(bundle)) {
                 if (file.type === 'chunk' && file.code) {
@@ -27,13 +33,20 @@ function cacheBustImports(): Plugin {
             }
         },
         writeBundle() {
-            // Transform umbraco-package.json after it's copied from public/
+            // Transform umbraco-package.json after it's copied from public/.
+            // Always (re)set ?v= to the current project version so the entry bundle URL
+            // changes on every release.
+            const version = getVersion();
             const distPath = resolve(__dirname, '../Umbraco.Community.BlockPreview/wwwroot/App_Plugins/Umbraco.Community.BlockPreview/umbraco-package.json');
             const json = JSON.parse(readFileSync(distPath, 'utf-8'));
 
+            // Keep the manifest version in sync with version.json (the build's
+            // UpdatePackageManifestVersion target re-sets this to the same value at pack time).
+            json.version = version;
+
             for (const ext of json.extensions || []) {
-                if (ext.js && !ext.js.includes('?v=')) {
-                    ext.js = `${ext.js}?v=${json.version}`;
+                if (ext.js) {
+                    ext.js = `${ext.js.replace(/\?v=.*$/, '')}?v=${version}`;
                 }
             }