diff --git a/include/gp/dynamic/compiler/type/decls.hpp b/include/gp/dynamic/compiler/type/decls.hpp
new file mode 100644
index 0000000..d4175f7
--- /dev/null
+++ b/include/gp/dynamic/compiler/type/decls.hpp
@@ -0,0 +1,5 @@
+#pragma once
+
+enum class gr_base_type;
+struct gr_type;
+struct gr_variable;
diff --git a/include/gp/dynamic/compiler/type/variable.hpp b/include/gp/dynamic/compiler/type/variable.hpp
new file mode 100644
index 0000000..a0b39c0
--- /dev/null
+++ b/include/gp/dynamic/compiler/type/variable.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include "gp/dynamic/compiler/type/type.hpp"
+
+
+struct gr_variable {
+    /// Its type.
+    gr_type type;
+    /// Register position, separate for each type (int, float, string and objects);
+    size_t _register = std::numeric_limits<decltype(_register)>::max();
+    /// Declared from the global scope ?
+    bool is_global;
+    /// Declared from an object definition ?
+    bool is_field;
+    /// Does it have a value yet ?
+    bool is_initialized;
+    /// Is the type to be infered automatically ? (e.g. the `let` keyword).
+    bool is_auto;
+    /// Can we modify its value ?
+    bool is_constant;
+    /// Its unique name inside its scope (function based scope).
+    string name;
+    /// Is the variable visible from other files ? (Global only)
+    bool is_public;
+    /// The file where the variable is declared.
+    size_t file_id;
+    /// Position information in case of errors.
+    size_t lex_position;
+};
\ No newline at end of file