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diff --git a/rc/base/javascript.kak b/rc/base/javascript.kak
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+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufSetOption mimetype=text/x-javascript %{
+    set buffer filetype javascript
+}
+
+hook global BufCreate .*[.](js) %{
+    set buffer filetype javascript
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+addhl -group / regions -default code javascript \
+    double_string '"'  (?<!\\)(\\\\)*"        '' \
+    single_string "'"  (?<!\\)(\\\\)*'        '' \
+    comment       //   '$'                    '' \
+    comment       /\*  \*/                    ''
+
+# Regular expression flags are: g → global match, i → ignore case, m → multi-lines, y → sticky
+# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
+
+addhl -group /javascript/double_string fill string
+addhl -group /javascript/single_string fill string
+addhl -group /javascript/comment       fill comment
+
+addhl -group /javascript/code regex \$\w* 0:identifier
+addhl -group /javascript/code regex \<(document|false|null|parent|self|this|true|undefined|window)\> 0:value
+addhl -group /javascript/code regex "-?[0-9]*\.?[0-9]+" 0:value
+addhl -group /javascript/code regex \<(Array|Boolean|Date|Function|Number|Object|RegExp|String)\> 0:type
+addhl -group /javascript/code regex (?<=\W)/[^\n/]+/[gimy]* 0:meta
+
+# Keywords are collected at
+# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#Keywords
+addhl -group /javascript/code regex \<(break|case|catch|class|const|continue|debugger|default|delete|do|else|export|extends|finally|for|function|if|import|in|instanceof|let|new|of|return|super|switch|throw|try|typeof|var|void|while|with|yield)\> 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden _javascript_filter_around_selections %{
+    # remove trailing white spaces
+    try %{ exec -draft -itersel <a-x> s \h+$ <ret> d }
+}
+
+def -hidden _javascript_indent_on_char %<
+    eval -draft -itersel %<
+        # align closer token to its opener when alone on a line
+        try %/ exec -draft <a-h> <a-k> ^\h+[]}]$ <ret> m s \`|.\' <ret> 1<a-&> /
+    >
+>
+
+def -hidden _javascript_indent_on_new_line %<
+    eval -draft -itersel %<
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _javascript_filter_around_selections <ret> }
+        # copy // comments prefix and following white spaces
+        try %{ exec -draft k x s ^\h*\K#\h* <ret> y j p }
+        # indent after lines beginning / ending with opener token
+        try %_ exec -draft k x <a-k> ^\h*[[{]|[[{]$ <ret> j <a-gt> _
+    >
+>
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=javascript %{
+    addhl ref javascript
+
+    hook window InsertEnd  .* -group javascript-hooks  _javascript_filter_around_selections
+    hook window InsertChar .* -group javascript-indent _javascript_indent_on_char
+    hook window InsertChar \n -group javascript-indent _javascript_indent_on_new_line
+}
+
+hook global WinSetOption filetype=(?!javascript).* %{
+    rmhl javascript
+    rmhooks window javascript-indent
+    rmhooks window javascript-hooks
+}