1 files changed, 17 insertions, 0 deletions
diff --git a/crates/sloth_vm/src/native.rs b/crates/sloth_vm/src/native.rs
index 8b13789..8790cbd 100644
--- a/crates/sloth_vm/src/native.rs
+++ b/crates/sloth_vm/src/native.rs
@@ -1 +1,18 @@
+use crate::value::Primitive;
+use crate::VM;
 
+pub type NativeFunctionResult = Result<Primitive, Error>;
+pub type NativeFunctionInput = fn(&mut VM, &[Primitive]) -> NativeFunctionResult;
+
+pub enum Error {
+    InvalidArgument,
+    Unknown(String),
+}
+
+#[allow(clippy::type_complexity)]
+pub struct NativeFunction {
+    pub name: &'static str,
+    pub function: NativeFunctionInput,
+    pub arity: u8,
+    pub returns_value: bool,
+}