[Fix #1421] Make the format action in TypeScript code configurable

Author: bbatsov

CHANGELOG.md

@@ -14,6 +14,7 @@
 * Add a F# module.
 * Auto-install `use-package`.
 * Add `prelude-vertico` module. Vertico a simpler alternative to `ivy-mode` and supersedes Selectrum.
+* Make it possible to configure the TypeScript format action using `prelude-ts-format-action`.
 
 ### Changes
 

modules/prelude-ts.el

@@ -34,6 +34,12 @@
 
 (add-to-list 'auto-mode-alist '("\\.ts\\'" . typescript-mode))
 
+(defcustom prelude-ts-format-action #'tide-format-before-save
+  "The format function to invoke on save.
+
+Triggered only when `prelude-format-on-save' is enabled."
+  :package-version '(prelude . "1.2"))
+
 (with-eval-after-load 'typescript-mode
   (defun prelude-ts-mode-defaults ()
     (interactive)
@@ -46,8 +52,8 @@
   ;; formats the buffer before saving
   (add-hook 'before-save-hook
             (lambda ()
-              (when prelude-format-on-save
-                (tide-format-before-save))))
+              (when (and prelude-format-on-save prelude-ts-format-action)
+                (funcall prelude-ts-format-action))))
 
   (setq prelude-ts-mode-hook 'prelude-ts-mode-defaults)