diff --git a/crates/project/src/lib.rs b/crates/project/src/lib.rs
index eb45600d..cd5e5077 100644
--- a/crates/project/src/lib.rs
+++ b/crates/project/src/lib.rs
@@ -7,6 +7,7 @@ pub mod pretty;
 pub mod script;
 pub mod telemetry;
 
+use crate::module::{CERT, MINT, SPEND, VALIDATOR_NAMES, WITHDRAW};
 use aiken_lang::{
     ast::{Definition, Function, ModuleKind, TypedDataType, TypedDefinition, TypedFunction},
     builder::{DataTypeKey, FunctionAccessKey},
@@ -50,12 +51,6 @@ pub struct Source {
     pub kind: ModuleKind,
 }
 
-pub const SPEND: &str = "spend";
-pub const CERT: &str = "cert";
-pub const MINT: &str = "mint";
-pub const WITHDRAWL: &str = "withdrawl";
-pub const VALIDATOR_NAMES: [&str; 4] = [SPEND, CERT, MINT, WITHDRAWL];
-
 pub struct Project<T>
 where
     T: EventListener,
@@ -351,7 +346,7 @@ where
 
                         // depending on name, validate the minimum number of arguments
                         // if too low, push a new error on to errors
-                        if [MINT, CERT, WITHDRAWL].contains(&func_def.name.as_str())
+                        if [MINT, CERT, WITHDRAW].contains(&func_def.name.as_str())
                             && func_def.arguments.len() < 2
                         {
                             errors.push(Error::WrongValidatorArity {
diff --git a/crates/project/src/module.rs b/crates/project/src/module.rs
index 022d369b..4a50ddf1 100644
--- a/crates/project/src/module.rs
+++ b/crates/project/src/module.rs
@@ -4,7 +4,7 @@ use std::{
     path::PathBuf,
 };
 
-use aiken_lang::ast::{ModuleKind, TypedModule, UntypedModule};
+use aiken_lang::ast::{Definition, ModuleKind, TypedModule, UntypedModule};
 use petgraph::{algo, graph::NodeIndex, Direction, Graph};
 
 use crate::error::Error;
@@ -155,6 +155,12 @@ fn find_cycle(
     false
 }
 
+pub const SPEND: &str = "spend";
+pub const CERT: &str = "cert";
+pub const MINT: &str = "mint";
+pub const WITHDRAW: &str = "withdraw";
+pub const VALIDATOR_NAMES: [&str; 4] = [SPEND, CERT, MINT, WITHDRAW];
+
 #[derive(Debug, Clone)]
 pub struct CheckedModule {
     pub name: String,
@@ -165,6 +171,15 @@ pub struct CheckedModule {
     // pub extra: ModuleExtra,
 }
 
+impl CheckedModule {
+    pub fn is_library(&self) -> bool {
+        self.ast.definitions().any(|def| match def {
+            Definition::Fn(func_def) => VALIDATOR_NAMES.contains(&func_def.name.as_str()),
+            _ => false,
+        })
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct CheckedModules(HashMap<String, CheckedModule>);