diff --git a/plugins/by-name/treesj/default.nix b/plugins/by-name/treesj/default.nix
new file mode 100644
index 0000000000..3cc957d18f
--- /dev/null
+++ b/plugins/by-name/treesj/default.nix
@@ -0,0 +1,57 @@
+{ lib, ... }:
+let
+  inherit (lib.nixvim) defaultNullOpts;
+in
+lib.nixvim.plugins.mkNeovimPlugin {
+  name = "treesj";
+
+  description = ''
+    A plugin for splitting/joining blocks of code like arrays,
+    hashes, statements, objects, dictionaries, etc.
+  '';
+
+  maintainers = [ lib.maintainers.jolars ];
+
+  settingsOptions = {
+    use_default_keymaps = defaultNullOpts.mkBool true ''
+      Use default keymaps (`<space>m`: toggle, `<space>j`: join, `<space>s`: split).
+    '';
+
+    check_syntax_error = defaultNullOpts.mkBool true ''
+      If true, then a node with syntax error will not be formatted.
+    '';
+
+    max_join_length = defaultNullOpts.mkUnsignedInt 120 ''
+      If true and the line after the join will be longer
+      than this value, the node will not be formatted.
+    '';
+
+    cursor_behavior = defaultNullOpts.mkEnumFirstDefault [ "hold" "start" "end" ] ''
+      Cursor behavior. 
+        - `hold`: cursor follows the node/place on which it was called.
+        - `start`: cursor jumps to the first symbol of the node being formatted.
+        - `end`: cursor jumps to the last symbol of the node being formatted.
+    '';
+
+    notify = defaultNullOpts.mkBool true ''
+      Notify about possible problems or not.
+    '';
+
+    dot_repeat = defaultNullOpts.mkBool true ''
+      Use `dot` for repeat action.
+    '';
+
+    on_error = defaultNullOpts.mkRaw null ''
+      Callback for treesj error handler.
+    '';
+
+    langs = defaultNullOpts.mkAttrsOf lib.types.anything { } ''
+      Presets for languages.
+    '';
+  };
+
+  settingsExample = {
+    use_default_keymaps = false;
+    cursor_behavior = "start";
+  };
+}
diff --git a/tests/test-sources/plugins/by-name/treesj/default.nix b/tests/test-sources/plugins/by-name/treesj/default.nix
new file mode 100644
index 0000000000..e26ee47154
--- /dev/null
+++ b/tests/test-sources/plugins/by-name/treesj/default.nix
@@ -0,0 +1,64 @@
+{
+  empty = {
+    plugins.treesj.enable = true;
+  };
+
+  defaults = {
+    plugins.treesj = {
+      enable = true;
+
+      settings = {
+        use_default_keymaps = true;
+        check_syntax_error = true;
+        max_join_length = 120;
+        cursor_behavior = "hold";
+        notify = true;
+        dot_repeat = true;
+        on_error.__raw = "nil";
+        langs = { };
+      };
+    };
+  };
+
+  example = {
+    plugins.treesj = {
+      enable = true;
+
+      settings = {
+        cursor_behavior = "start";
+        max_join_length = 80;
+        dot_repeat = false;
+        langs = {
+          r = {
+            arguments.__raw = ''
+              require("treesj.langs.utils").set_preset_for_args({
+                both = {
+                  separator = "comma",
+                },
+                split = {
+                  recursive_ignore = { "subset" },
+                },
+              })
+            '';
+            parameters.__raw = ''
+              require("treesj.langs.utils").set_preset_for_args({
+                both = {
+                  separator = "comma",
+                },
+                split = {
+                  recursive_ignore = { "subset" },
+                },
+              })
+            '';
+            left_assignment = {
+              target_nodes = [
+                "arguments"
+                "parameters"
+              ];
+            };
+          };
+        };
+      };
+    };
+  };
+}