feat: add version notification message

client/package.json

@@ -14,9 +14,11 @@
     "vscode": "^1.53.0"
   },
   "dependencies": {
+    "semver": "7.3.5",
     "vscode-languageclient": "^7.0.0"
   },
   "devDependencies": {
+    "@types/semver": "7.3.4",
     "@types/vscode": "1.53.0",
     "vscode-test": "^1.5.0"
   }

client/src/extension.ts

@@ -12,6 +12,7 @@ import { DenoDebugConfigurationProvider } from "./debug_config_provider";
 import * as fs from "fs";
 import * as os from "os";
 import * as path from "path";
+import * as semver from "semver";
 import * as vscode from "vscode";
 import {
   Executable,
@@ -20,6 +21,8 @@ import {
   ServerOptions,
 } from "vscode-languageclient/node";
 
+const SERVER_SEMVER = ">=1.9.0";
+
 interface TsLanguageFeaturesApiV0 {
   configurePlugin(
     pluginId: string,
@@ -181,7 +184,14 @@ export async function activate(
     getSettings(),
   );
 
-  showWelcomePage(context);
+  if (
+    semver.valid(serverVersion) &&
+    !semver.satisfies(serverVersion, SERVER_SEMVER)
+  ) {
+    notifyServerSemver(serverVersion);
+  } else {
+    showWelcomePage(context);
+  }
 }
 
 export function deactivate(): Thenable<void> | undefined {
@@ -193,6 +203,13 @@ export function deactivate(): Thenable<void> | undefined {
   });
 }
 
+function notifyServerSemver(serverVersion: string) {
+  return vscode.window.showWarningMessage(
+    `The version of Deno language server ("${serverVersion}") does not meet the requirements of the extension ("${SERVER_SEMVER}"). Please update Deno and restart.`,
+    "OK",
+  );
+}
+
 function showWelcomePage(context: vscode.ExtensionContext) {
   const welcomeShown = context.globalState.get<boolean>("deno.welcomeShown") ??
     false;