Try using export

test/electron/src/lib.rs

@@ -1,12 +1,4 @@
-use neon::prelude::*;
-
-fn hello(mut cx: FunctionContext) -> JsResult<JsString> {
-    Ok(cx.string("Hello, World!"))
-}
-
-#[neon::main]
-fn main(mut cx: ModuleContext) -> NeonResult<()> {
-    cx.export_function("hello", hello)?;
-
-    Ok(())
+#[neon::export]
+fn hello() -> &'static str {
+    "Hello, World!"
 }