diff --git a/src/lib.rs b/src/lib.rs
index 58083c0..de1b32d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,6 +12,7 @@ pub mod named;
 pub mod num;
 pub mod parse;
 pub mod pattern;
+pub mod resolution;
 #[cfg(feature = "serde")]
 mod serde;
 pub mod str;
diff --git a/src/resolution.rs b/src/resolution.rs
new file mode 100644
index 0000000..39b1040
--- /dev/null
+++ b/src/resolution.rs
@@ -0,0 +1,37 @@
+use std::path::Path;
+use std::sync::Arc;
+
+/// Powers error reporting by mapping compiler diagnostics to the specific file.
+#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+pub struct SourceFile {
+    /// The name or path of the source file (e.g., "./simf/main.simf").
+    name: Arc<Path>,
+    /// The actual text content of the source file.
+    content: Arc<str>,
+}
+
+impl From<(&Path, &str)> for SourceFile {
+    fn from((name, content): (&Path, &str)) -> Self {
+        Self {
+            name: Arc::from(name),
+            content: Arc::from(content),
+        }
+    }
+}
+
+impl SourceFile {
+    pub fn new(name: &Path, content: Arc<str>) -> Self {
+        Self {
+            name: Arc::from(name),
+            content,
+        }
+    }
+
+    pub fn name(&self) -> &Path {
+        self.name.as_ref()
+    }
+
+    pub fn content(&self) -> Arc<str> {
+        self.content.clone()
+    }
+}