diff --git a/src/builtin/list.rs b/src/builtin/list.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/builtin/map.rs b/src/builtin/map.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/builtin/math.rs b/src/builtin/math.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/builtin/meta.rs b/src/builtin/meta.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/builtin/mod.rs b/src/builtin/mod.rs
index 3f4eb52..33fa519 100644
--- a/src/builtin/mod.rs
+++ b/src/builtin/mod.rs
@@ -5,6 +5,12 @@ use crate::args::CallArgs;
 use crate::value::Value;
 
 mod color;
+mod list;
+mod map;
+mod math;
+mod meta;
+mod selector;
+mod string;
 
 pub(crate) type Builtin = Box<dyn Fn(&CallArgs) -> Option<Value> + Send + Sync>;
 
diff --git a/src/builtin/selector.rs b/src/builtin/selector.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/builtin/string.rs b/src/builtin/string.rs
new file mode 100644
index 0000000..e69de29