Add a generic WasmAstNode enum.

src/wasm/fixed_width_area.rs

@@ -1,6 +1,6 @@
 use std::marker::PhantomData;
 
-use organic::types::Document;
+use organic::types::FixedWidthArea;
 use serde::Deserialize;
 use serde::Serialize;
 
@@ -12,19 +12,19 @@ use crate::wasm::to_wasm::ToWasmStandardProperties;
 #[derive(Serialize, Deserialize)]
 #[serde(tag = "ast_node")]
 #[serde(rename = "org-data")]
-pub(crate) struct WasmDocument<'s> {
+pub(crate) struct WasmFixedWidthArea<'s> {
     standard_properties: WasmStandardProperties,
     children: Vec<()>,
     phantom: PhantomData<&'s ()>,
 }
 
 to_wasm!(
-    WasmDocument<'s>,
-    Document<'s>,
+    WasmFixedWidthArea<'s>,
+    FixedWidthArea<'s>,
     wasm_context,
     standard_properties,
     {
-        Ok(WasmDocument {
+        Ok(WasmFixedWidthArea {
             standard_properties,
             children: Vec::new(),
             phantom: PhantomData,