Add placeholders for all the wasm ast nodes.

src/wasm/fixed_width_area.rs

@@ -0,0 +1,33 @@
+use std::marker::PhantomData;
+
+use organic::types::Document;
+use serde::Deserialize;
+use serde::Serialize;
+
+use super::macros::to_wasm;
+use super::standard_properties::WasmStandardProperties;
+use super::to_wasm::ToWasm;
+use crate::wasm::to_wasm::ToWasmStandardProperties;
+
+#[derive(Serialize, Deserialize)]
+#[serde(tag = "ast_node")]
+#[serde(rename = "org-data")]
+pub(crate) struct WasmDocument<'s> {
+    standard_properties: WasmStandardProperties,
+    children: Vec<()>,
+    phantom: PhantomData<&'s ()>,
+}
+
+to_wasm!(
+    WasmDocument<'s>,
+    Document<'s>,
+    wasm_context,
+    standard_properties,
+    {
+        Ok(WasmDocument {
+            standard_properties,
+            children: Vec::new(),
+            phantom: PhantomData,
+        })
+    }
+);