(breaking) enable new transformation by default

packages/svelte-vscode/package.json

@@ -271,10 +271,16 @@
                 },
                 "svelte.plugin.svelte.useNewTransformation": {
                     "type": "boolean",
-                    "default": false,
+                    "default": true,
                     "title": "Use a new transformation for intellisense",
                     "description": "Svelte files need to be transformed to something that TypeScript understands for intellisense. Version 2.0 of this transformation can be enabled with this setting. It will be the default, soon."
                 },
+                "svelte.plugin.svelte.note-new-transformation": {
+                    "type": "boolean",
+                    "default": true,
+                    "title": "Show a note about the new transformation",
+                    "description": "There's a new transformation for improved intellisense which is now turned on by default. This note notifies you about it."
+                },
                 "svelte.plugin.svelte.diagnostics.enable": {
                     "type": "boolean",
                     "default": true,

packages/svelte-vscode/src/extension.ts

@@ -223,6 +223,24 @@ export function activateSvelteLanguageServer(context: ExtensionContext) {
         return ls;
     }
 
+    noteOfNewTransformation();
+    let enabled = workspace
+        .getConfiguration('svelte.plugin.svelte')
+        .get<boolean>('useNewTransformation');
+    context.subscriptions.push(
+        workspace.onDidChangeConfiguration(() => {
+            if (
+                enabled !==
+                workspace
+                    .getConfiguration('svelte.plugin.svelte')
+                    .get<boolean>('useNewTransformation')
+            ) {
+                enabled = !enabled;
+                restartLS(false);
+            }
+        })
+    );
+
     addDidChangeTextDocumentListener(getLS);
 
     addFindFileReferencesListener(getLS, context);
@@ -488,3 +506,32 @@ function warnIfOldExtensionInstalled() {
         );
     }
 }
+
+async function noteOfNewTransformation() {
+    const enabled = workspace
+        .getConfiguration('svelte.plugin.svelte')
+        .get<boolean>('useNewTransformation');
+    const shouldNote = workspace
+        .getConfiguration('svelte.plugin.svelte')
+        .get<boolean>('note-new-transformation');
+    if (!enabled || !shouldNote) {
+        return;
+    }
+
+    const answers = ['Ask again later', 'Disable new transformation for now', 'OK'];
+    const response = await window.showInformationMessage(
+        'The Svelte for VS Code extension comes with a new transformation for improved intellisense. ' +
+            'It is enabled by default now. If you notice bugs, please report them. ' +
+            'You can switch to the old transformation setting "svelte.plugin.svelte.useNewTransformation" to "false".',
+        ...answers
+    );
+
+    if (response === answers[1]) {
+        workspace
+            .getConfiguration('svelte.plugin.svelte')
+            .update('useNewTransformation', false, true);
+    }
+    workspace
+        .getConfiguration('svelte.plugin.svelte')
+        .update('note-new-transformation', response === answers[0], true);
+}