1 files changed, 31 insertions, 0 deletions
diff --git a/ext/napi/sym/lib.rs b/ext/napi/sym/lib.rs
new file mode 100644
index 000000000..e2826306b
--- /dev/null
+++ b/ext/napi/sym/lib.rs
@@ -0,0 +1,31 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+use proc_macro::TokenStream;
+use quote::quote;
+use serde::Deserialize;
+
+static NAPI_EXPORTS: &str = include_str!("./symbol_exports.json");
+
+#[derive(Deserialize)]
+struct SymbolExports {
+  pub symbols: Vec<String>,
+}
+
+#[proc_macro_attribute]
+pub fn napi_sym(_attr: TokenStream, item: TokenStream) -> TokenStream {
+  let func = syn::parse::<syn::ItemFn>(item).expect("expected a function");
+
+  let exports: SymbolExports =
+    serde_json::from_str(NAPI_EXPORTS).expect("failed to parse exports");
+  let name = &func.sig.ident;
+  assert!(
+    exports.symbols.contains(&name.to_string()),
+    "cli/napi/sym/symbol_exports.json is out of sync!"
+  );
+
+  TokenStream::from(quote! {
+    crate::napi_wrap! {
+      #func
+    }
+  })
+}