diff --git a/prettier-tests.el b/prettier-tests.el
index 587fdd8..83a2848 100644
--- a/prettier-tests.el
+++ b/prettier-tests.el
@@ -2,7 +2,7 @@
 
 ;; Copyright (c) 2018-present Julian Scheid
 
-;; Package-Requires: ((web-mode "20200501") (elm-mode "20200406") (pug-mode "20180513") (svelte-mode "20200327") (toml-mode "20161107") (solidity-mode "20200418") (vue-mode "20190415") (lsp-mode "20201111") (noflet "20141102") (f "20191110") (json-mode "20190123") (ert-async "0.1"))
+;; Package-Requires: ((web-mode "20200501") (elm-mode "20200406") (pug-mode "20180513") (svelte-mode "20210222") (toml-mode "20161107") (solidity-mode "20200418") (vue-mode "20190415") (lsp-mode "20201111") (noflet "20141102") (f "20191110") (json-mode "20190123") (typescript-mode "20201002") (ert-async "0.1"))
 
 ;;; Commentary:
 
@@ -16,6 +16,8 @@
 (require 'noflet)
 (require 'thingatpt)
 (require 'prettier)
+(require 'svelte-mode)
+(require 'typescript-mode)
 
 (eval-when-compile
   (require 'ert-async))
@@ -47,7 +49,8 @@
                 (prettier--eval-file-if-exists "setup.elisp")
                 (prettier-prettify)
                 (prettier--eval-file-if-exists "test.elisp")
-                (buffer-string)))
+                (buffer-substring-no-properties (point-min)
+                                                (point-max))))
              (expected
               (with-temp-buffer
                 (insert-file-contents
diff --git a/prettier.el b/prettier.el
index 69d9a3f..c3f9934 100644
--- a/prettier.el
+++ b/prettier.el
@@ -826,9 +826,10 @@ Additional considerations were:
      (lambda (proc event)
        (unless (and (eq (process-status proc) 'signal)
                     (eq (process-exit-status proc) 3))
-         (message "prettier-process (%s) quit unexpectedly: %s"
+         (message "prettier-process (%s) quit unexpectedly: %s (%s)"
                   (process-get proc :server-id)
-                  (string-trim event)))
+                  (string-trim event)
+                  (buffer-string)))
        (unless prettier-keep-server-buffer-flag
          (kill-buffer (process-buffer proc)))
        (remhash node-command prettier-processes)))
@@ -1382,6 +1383,9 @@ for derived modes.)"
         (or (and (fboundp 'mhtml-mode)
                  (get-text-property (point) 'mhtml-submode)
                  'mhtml-mode)
+            (and (fboundp 'svelte-mode)
+                 (get-text-property (point) 'svelte-submode)
+                 'svelte-mode)
             (and (boundp 'mmm-primary-mode)
                  mmm-primary-mode)
             major-mode)))))
diff --git a/test-cases/svelte-mode/a.original.svelte b/test-cases/svelte-mode/a.original.svelte
index c5b72ba..0d42496 100644
--- a/test-cases/svelte-mode/a.original.svelte
+++ b/test-cases/svelte-mode/a.original.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
    let  name  =  "world" ;
 </script>
 
diff --git a/test-cases/svelte-mode/a.prettier.svelte b/test-cases/svelte-mode/a.prettier.svelte
index 05dac42..d57d2ec 100644
--- a/test-cases/svelte-mode/a.prettier.svelte
+++ b/test-cases/svelte-mode/a.prettier.svelte
@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
   let name = "world";
 </script>
 
diff --git a/test-cases/svelte-mode/setup.elisp b/test-cases/svelte-mode/setup.elisp
new file mode 100644
index 0000000..1bc2fba
--- /dev/null
+++ b/test-cases/svelte-mode/setup.elisp
@@ -0,0 +1,7 @@
+(progn
+  ;; needed for enabling svelte sub-modes
+  (font-lock-fontify-buffer)
+  ;; go to typescript section
+  (goto-char 23)
+  ;; activate sveltse sub-mode at point
+  (run-hooks 'post-command-hook))