Start defining the return type.

src/wasm/parse_result.rs

@@ -0,0 +1,14 @@
+use serde::Deserialize;
+use serde::Serialize;
+
+use super::document::WasmDocument;
+
+#[derive(Serialize, Deserialize)]
+#[serde(tag = "status", content = "content")]
+pub(crate) enum ParseResult {
+    #[serde(rename = "success")]
+    Success(WasmDocument),
+
+    #[serde(rename = "error")]
+    Error(String),
+}