diff --git a/src/bin_wasm.rs b/src/bin_wasm.rs
index 26675c8..242c235 100644
--- a/src/bin_wasm.rs
+++ b/src/bin_wasm.rs
@@ -11,7 +11,7 @@ mod wasm;
 pub fn parse_org(org_contents: &str) -> wasm_bindgen::JsValue {
     let global_settings = GlobalSettings::default();
     let rust_parsed = parse_with_settings(org_contents, &global_settings)
-        .map(|document| ParseResult::Success(document.into()))
+        .map(|document| ParseResult::Success((org_contents, document).into()))
         .unwrap_or_else(|err| ParseResult::Error(format!("{:?}", err)));
     serde_wasm_bindgen::to_value(&rust_parsed).unwrap()
 }
diff --git a/src/wasm/document.rs b/src/wasm/document.rs
index 2bcd1d6..abd73e2 100644
--- a/src/wasm/document.rs
+++ b/src/wasm/document.rs
@@ -2,13 +2,17 @@ use organic::types::Document;
 use serde::Deserialize;
 use serde::Serialize;
 
+use super::macros::to_wasm;
+
 #[derive(Serialize, Deserialize)]
 #[serde(tag = "ast_node")]
 #[serde(rename = "org-data")]
-pub(crate) struct WasmDocument {}
-
-impl From<Document<'_>> for WasmDocument {
-    fn from(value: Document) -> Self {
-        todo!()
-    }
+pub(crate) struct WasmDocument {
+    children: Vec<()>,
 }
+
+to_wasm!(WasmDocument, Document<'s>, original, document, {
+    WasmDocument {
+        children: Vec::new(),
+    }
+});
diff --git a/src/wasm/macros.rs b/src/wasm/macros.rs
new file mode 100644
index 0000000..8d02399
--- /dev/null
+++ b/src/wasm/macros.rs
@@ -0,0 +1,15 @@
+/// Write the implementation for the intermediate ast node.
+///
+/// This exists to make changing the type signature easier.
+macro_rules! to_wasm {
+    ($ostruct:ty, $istruct:ty, $original:ident, $document:ident, $fnbody:tt) => {
+        impl<'s> From<(&'s str, $istruct)> for $ostruct {
+            fn from(value: (&'s str, $istruct)) -> $ostruct {
+                let ($original, $document) = value;
+                $fnbody
+            }
+        }
+    };
+}
+
+pub(crate) use to_wasm;
diff --git a/src/wasm/mod.rs b/src/wasm/mod.rs
index 4ea7533..807f1ce 100644
--- a/src/wasm/mod.rs
+++ b/src/wasm/mod.rs
@@ -1,4 +1,5 @@
 mod document;
+mod macros;
 mod parse_result;
 
 pub(crate) use parse_result::ParseResult;