forgot to add file

uw8-tool/src/filter_exports.rs

@@ -0,0 +1,21 @@
+use std::path::Path;
+use anyhow::Result;
+
+pub fn filter_exports(in_path: &Path, out_path: &Path) -> Result<()> {
+    let mut module = walrus::Module::from_file(in_path)?;
+
+    let exports_to_delete: Vec<_> = module.exports.iter().filter_map(|export| match export.name.as_str() {
+        "upd" => None,
+        _ => Some(export.id())
+    }).collect();
+
+    for id in exports_to_delete {
+        module.exports.delete(id);
+    }
+
+    walrus::passes::gc::run(&mut module);
+
+    module.emit_wasm_file(out_path)?;
+
+    Ok(())
+}