feat(updater): add allowDowngrades option (#2726)

* feat(updater): add allowDowngrades option

* Add change file for allow_downgrades feature

* Update .changes/add-allow-downgrades.md

Committed via a GitHub action: https://github.com/tauri-apps/plugins-workspace/actions/runs/15383066245

Co-authored-by: Legend-Master <Legend-Master@users.noreply.github.com>

dist-js/index.d.ts

@@ -17,6 +17,10 @@ interface CheckOptions {
      * Target identifier for the running application. This is sent to the backend.
      */
     target?: string;
+    /**
+     * Allow downgrades to previous versions by not checking if the current version is greater than the available version.
+     */
+    allowDowngrades?: boolean;
 }
 /** Options used when downloading an update */
 interface DownloadOptions {

guest-js/index.ts

@@ -22,6 +22,10 @@ interface CheckOptions {
    * Target identifier for the running application. This is sent to the backend.
    */
   target?: string
+  /**
+   * Allow downgrades to previous versions by not checking if the current version is greater than the available version.
+   */
+  allowDowngrades?: boolean
 }
 
 /** Options used when downloading an update */

src/commands.rs

@@ -46,6 +46,7 @@ pub(crate) async fn check<R: Runtime>(
     timeout: Option<u64>,
     proxy: Option<String>,
     target: Option<String>,
+    allow_downgrades: Option<bool>,
 ) -> Result<Option<Metadata>> {
     let mut builder = webview.updater_builder();
     if let Some(headers) = headers {
@@ -63,6 +64,9 @@ pub(crate) async fn check<R: Runtime>(
     if let Some(target) = target {
         builder = builder.target(target);
     }
+    if allow_downgrades.unwrap_or(false) {
+        builder = builder.version_comparator(|current, update| update.version != current);
+    }
 
     let updater = builder.build()?;
     let update = updater.check().await?;