ocamlPackages.ppx_deriving_yojson: init at 3.0

deriving Yojson is a ppx_deriving plugin that generates JSON serializers and
deserializers that use the Yojson library from an OCaml type definition.

Homepage: https://github.com/whitequark/ppx_deriving_yojson

pkgs/development/ocaml-modules/ppx_deriving_yojson/default.nix

@@ -0,0 +1,32 @@
+{ stdenv, fetchFromGitHub, ocaml, findlib, ocamlbuild, opam, topkg, cppo
+, ppx_import, ppx_deriving, yojson, ounit
+}:
+
+stdenv.mkDerivation rec {
+  name = "ocaml${ocaml.version}-ppx_deriving_yojson-${version}";
+  version = "3.0";
+
+  src = fetchFromGitHub {
+    owner = "whitequark";
+    repo = "ppx_deriving_yojson";
+    rev = "v${version}";
+    sha256 = "1id1a29qq0ax9qp98b5hv6p2q2r0vp4fbkkwzm1bxdhnasw97msk";
+  };
+
+  buildInputs = [ ocaml findlib ocamlbuild opam cppo ounit ppx_import ];
+
+  propagatedBuildInputs = [ ppx_deriving yojson ];
+
+  inherit (topkg) installPhase;
+
+  doCheck = true;
+  checkTarget = "test";
+
+  meta = {
+    description = "A Yojson codec generator for OCaml >= 4.02.";
+    inherit (src.meta) homepage;
+    license = stdenv.lib.licenses.mit;
+    maintainers = [ stdenv.lib.maintainers.vbgl ];
+    inherit (ocaml.meta) platforms;
+  };
+}

pkgs/top-level/ocaml-packages.nix

@@ -483,6 +483,8 @@ let
       then callPackage ../development/ocaml-modules/ppx_deriving {}
       else null;
 
+    ppx_deriving_yojson = callPackage ../development/ocaml-modules/ppx_deriving_yojson {};
+
     ppx_import = callPackage ../development/ocaml-modules/ppx_import {};
 
     ppx_tools =