2 files changed, 14 insertions, 0 deletions
diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index 7650ff95b..c2b50ba16 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -589,11 +589,16 @@ delete Object.prototype.__proto__;
    */
   function serverRequest({ id, ...request }) {
     debug(`serverRequest()`, { id, ...request });
+
     // reset all memoized source files names
     scriptFileNamesCache = undefined;
     // evict all memoized source file versions
     scriptVersionCache.clear();
     switch (request.method) {
+      case "restart": {
+        serverRestart();
+        return respond(id, true);
+      }
       case "configure": {
         const { options, errors } = ts
           .convertCompilerOptionsFromJson(request.compilerOptions, "");
@@ -918,6 +923,11 @@ delete Object.prototype.__proto__;
     debug("serverInit()");
   }
 
+  function serverRestart() {
+    languageService = ts.createLanguageService(host);
+    debug("serverRestart()");
+  }
+
   let hasStarted = false;
 
   /** Startup the runtime environment, setting various flags.
diff --git a/cli/tsc/compiler.d.ts b/cli/tsc/compiler.d.ts
index 2ea7eb298..1ba116170 100644
--- a/cli/tsc/compiler.d.ts
+++ b/cli/tsc/compiler.d.ts
@@ -251,4 +251,8 @@ declare global {
     specifier: string;
     position: number;
   }
+
+  interface Restart {
+    method: "restart";
+  }
 }