Offer non-aligned indentation in lists in js-mode (Bug#27503)

* lisp/progmodes/js.el (js--proper-indentation):
New customization option 'js-indent-align-list-continuation'.
Affects argument lists as well as arrays and object properties.
* test/manual/indent/js-indent-align-list-continuation-nil.js:
Test the change.

1 files changed, 7 insertions, 1 deletions

diff --git a/lisp/progmodes/js.el b/lisp/progmodes/js.el
index bae9e52bf0f..e6ffe4d75a6 100644
--- a/lisp/progmodes/js.el
+++ b/lisp/progmodes/js.el
@@ -475,6 +475,11 @@ This applies to function movement, marking, and so on."
   :type 'boolean
   :group 'js)
 
+(defcustom js-indent-align-list-continuation t
+  "Align continuation of non-empty ([{ lines in `js-mode'."
+  :type 'boolean
+  :group 'js)
+
 (defcustom js-comment-lineup-func #'c-lineup-C-comments
   "Lineup function for `cc-mode-style', for C comments in `js-mode'."
   :type 'function
@@ -2092,7 +2097,8 @@ indentation is aligned to that column."
                  (switch-keyword-p (looking-at "default\\_>\\|case\\_>[^:]"))
                  (continued-expr-p (js--continued-expression-p)))
              (goto-char (nth 1 parse-status)) ; go to the opening char
-             (if (looking-at "[({[]\\s-*\\(/[/*]\\|$\\)")
+             (if (or (not js-indent-align-list-continuation)
+                     (looking-at "[({[]\\s-*\\(/[/*]\\|$\\)"))
                  (progn ; nothing following the opening paren/bracket
                    (skip-syntax-backward " ")
                    (when (eq (char-before) ?\)) (backward-list))