diff --git a/bin/melppx.ml b/bin/melppx.ml
index 491feba096..293428418a 100644
--- a/bin/melppx.ml
+++ b/bin/melppx.ml
@@ -1 +1,25 @@
+(* Copyright (C) 2022- Authors of Melange
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * In addition to the permissions granted to you by the LGPL, you may combine
+ * or link a "work that uses the Library" with a publicly distributed version
+ * of this file to produce a combined library or application, then distribute
+ * that combined work under the terms of your choosing, with no requirement
+ * to comply with the obligations normally placed on you by section 4 of the
+ * LGPL version 3 (or the corresponding section of a later version of the LGPL
+ * should you choose to use a later version).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
+
 let () = Ppxlib.Driver.run_as_ppx_rewriter ()
diff --git a/flake.lock b/flake.lock
index e4666b9c8d..a84f057ab8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -64,11 +64,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1698098084,
-        "narHash": "sha256-MKz+XmZNFxHuSLC6aekLIaUnT6RhTo3vyozSDbIa5nA=",
+        "lastModified": 1698308385,
+        "narHash": "sha256-Iy/5lrHzZEHrxZamaacl5Vf06xTtNwQxEutpvaIS6Yc=",
         "owner": "nix-ocaml",
         "repo": "nix-overlays",
-        "rev": "dab0002da7413431ea1e62bbd34784bc3163c39f",
+        "rev": "52f99ba0d875cb588feb2a033afb64af5dadca25",
         "type": "github"
       },
       "original": {
@@ -79,17 +79,17 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1697935353,
-        "narHash": "sha256-dDwl5ziD24Gs0feke2seFXoQibHafb5XeNDWlUZxCbg=",
+        "lastModified": 1698256497,
+        "narHash": "sha256-NdQrWDU11jCpDxDNMwi/2QVA2t38j10seL2qAqVS/Y8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8dfad603247387df1df4826b8bea58efc5d012d8",
+        "rev": "0e18a0a0b4092f3f52bacfca3c0db8f7c66702d2",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "8dfad603247387df1df4826b8bea58efc5d012d8",
+        "rev": "0e18a0a0b4092f3f52bacfca3c0db8f7c66702d2",
         "type": "github"
       }
     },
diff --git a/jscomp/ext/ext_js_suffix.ml b/jscomp/ext/ext_js_suffix.ml
index 548ba2baa0..6e21a68d95 100644
--- a/jscomp/ext/ext_js_suffix.ml
+++ b/jscomp/ext/ext_js_suffix.ml
@@ -1,3 +1,27 @@
+(* Copyright (C) 2022- Authors of Melange
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * In addition to the permissions granted to you by the LGPL, you may combine
+ * or link a "work that uses the Library" with a publicly distributed version
+ * of this file to produce a combined library or application, then distribute
+ * that combined work under the terms of your choosing, with no requirement
+ * to comply with the obligations normally placed on you by section 4 of the
+ * LGPL version 3 (or the corresponding section of a later version of the LGPL
+ * should you choose to use a later version).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
+
 type t = string
 
 let to_string = Fun.id
diff --git a/jscomp/ext/ext_js_suffix.mli b/jscomp/ext/ext_js_suffix.mli
index 240c419074..a1dc339976 100644
--- a/jscomp/ext/ext_js_suffix.mli
+++ b/jscomp/ext/ext_js_suffix.mli
@@ -1,3 +1,27 @@
+(* Copyright (C) 2022- Authors of Melange
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * In addition to the permissions granted to you by the LGPL, you may combine
+ * or link a "work that uses the Library" with a publicly distributed version
+ * of this file to produce a combined library or application, then distribute
+ * that combined work under the terms of your choosing, with no requirement
+ * to comply with the obligations normally placed on you by section 4 of the
+ * LGPL version 3 (or the corresponding section of a later version of the LGPL
+ * should you choose to use a later version).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
+
 type t
 
 val to_string : t -> string
diff --git a/jscomp/ext/ext_module_system.ml b/jscomp/ext/ext_module_system.ml
index 8312dd7d8a..e4420ec781 100644
--- a/jscomp/ext/ext_module_system.ml
+++ b/jscomp/ext/ext_module_system.ml
@@ -1,4 +1,26 @@
-let ( // ) = Ext_path.( // )
+(* Copyright (C) 2022- Authors of Melange
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * In addition to the permissions granted to you by the LGPL, you may combine
+ * or link a "work that uses the Library" with a publicly distributed version
+ * of this file to produce a combined library or application, then distribute
+ * that combined work under the terms of your choosing, with no requirement
+ * to comply with the obligations normally placed on you by section 4 of the
+ * LGPL version 3 (or the corresponding section of a later version of the LGPL
+ * should you choose to use a later version).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
 
 type t = NodeJS | Es6 | Es6_global
 
@@ -14,7 +36,10 @@ let compatible ~dep t =
 
 (* in runtime lib, [es6] and [es6] are treated the same way *)
 let runtime_dir = function NodeJS -> "js" | Es6 | Es6_global -> "es6"
-let runtime_package_path js_file = (Literals.package_name ^ ".js") // js_file
+
+let runtime_package_path =
+  let ( // ) = Ext_path.( // ) in
+  fun js_file -> (Literals.package_name ^ ".js") // js_file
 
 let to_string = function
   | NodeJS -> "commonjs"
diff --git a/jscomp/ext/ext_module_system.mli b/jscomp/ext/ext_module_system.mli
index d908ee7f6c..85b6b9c306 100644
--- a/jscomp/ext/ext_module_system.mli
+++ b/jscomp/ext/ext_module_system.mli
@@ -1,3 +1,27 @@
+(* Copyright (C) 2022- Authors of Melange
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * In addition to the permissions granted to you by the LGPL, you may combine
+ * or link a "work that uses the Library" with a publicly distributed version
+ * of this file to produce a combined library or application, then distribute
+ * that combined work under the terms of your choosing, with no requirement
+ * to comply with the obligations normally placed on you by section 4 of the
+ * LGPL version 3 (or the corresponding section of a later version of the LGPL
+ * should you choose to use a later version).
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *)
+
 type t = NodeJS | Es6 | Es6_global
 
 val default : t
diff --git a/jscomp/ext/ext_modulename.ml b/jscomp/ext/ext_modulename.ml
index 0e1fd14760..924101b639 100644
--- a/jscomp/ext/ext_modulename.ml
+++ b/jscomp/ext/ext_modulename.ml
@@ -55,7 +55,7 @@ and collect_next buf s off len =
     | '.' | '-' -> collect_start buf s next len
     | _ -> collect_next buf s next len
 
-(** This is for a js exeternal module, we can change it when printing
+(** This is for a JS external module, we can change it when printing
    for example
    {[
      var React$1 = require('react');