* lisp/progmodes/js.el (js-syntax-propertize, js-syntax-propertize-regexp):

* lisp/progmodes/js.el (js-syntax-propertize, js-syntax-propertize-regexp):
New function.
(js--regexp-literal, js-syntax-propertize-function): Remove.
(js-mode): Use js-syntax-propertize to handle multilines.
(js-mode-map): Don't rebind electric keys.
(js-insert-and-indent): Remove.
(js-mode): Setup electric-layout and electric-indent instead.

Fixes: debbugs:9183