fix(napi-derive): codegen bug when multi impl on same file

crates/backend/src/codegen/struct.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::sync::atomic::{AtomicU32, Ordering};
 
 use proc_macro2::{Ident, Literal, Span, TokenStream};
 use quote::ToTokens;
@@ -8,6 +9,8 @@ use crate::{
   BindgenResult, FnKind, NapiImpl, NapiStruct, NapiStructKind, TryToTokens,
 };
 
+static NAPI_IMPL_ID: AtomicU32 = AtomicU32::new(0);
+
 // Generate trait implementations for given Struct.
 fn gen_napi_value_map_impl(name: &Ident, to_napi_val_impl: TokenStream) -> TokenStream {
   let name_str = name.to_string();
@@ -476,7 +479,11 @@ impl NapiImpl {
     let name_str = self.name.to_string();
     let js_name = format!("{}\0", self.js_name);
     let mod_name = Ident::new(
-      &format!("__napi_impl_helper__{}", name_str),
+      &format!(
+        "__napi_impl_helper__{}__{}",
+        name_str,
+        NAPI_IMPL_ID.fetch_add(1, Ordering::SeqCst)
+      ),
       Span::call_site(),
     );
 

examples/napi/src/array.rs

@@ -1,5 +1,5 @@
 #[napi]
-fn get_words() -> Vec<&'static str> {
+pub fn get_words() -> Vec<&'static str> {
   vec!["foo", "bar"]
 }
 

examples/napi/src/class.rs

@@ -1,4 +1,4 @@
-use napi::Result;
+use napi::{bindgen_prelude::Buffer, Result};
 
 use crate::r#enum::Kind;
 
@@ -75,6 +75,14 @@ impl Blake2bHasher {
   }
 }
 
+#[napi]
+impl Blake2bHasher {
+  #[napi]
+  pub fn update(&mut self, data: Buffer) {
+    self.0 += data.len() as u32;
+  }
+}
+
 #[napi]
 pub struct Blake2bKey(u32);
 

examples/napi/src/typed_array.rs

@@ -8,7 +8,7 @@ fn get_buffer() -> Buffer {
 #[napi]
 fn append_buffer(buf: Buffer) -> Buffer {
   let mut buf = Vec::<u8>::from(buf);
-  buf.push('!' as u8);
+  buf.push(b'!' as u8);
   buf.into()
 }