diff --git a/crates/macro/src/parser/mod.rs b/crates/macro/src/parser/mod.rs
index 53947c19..a331ea41 100644
--- a/crates/macro/src/parser/mod.rs
+++ b/crates/macro/src/parser/mod.rs
@@ -816,7 +816,7 @@ impl ConvertToAST for syn::ItemImpl {
 
     let struct_name = extract_path_ident(struct_name)?;
 
-    let mut struct_js_name = struct_name.to_string();
+    let mut struct_js_name = struct_name.to_string().to_case(Case::UpperCamel);
     let mut items = vec![];
     let mut task_output_type = None;
     for item in self.items.iter_mut() {
diff --git a/examples/napi/__test__/typegen.spec.ts.md b/examples/napi/__test__/typegen.spec.ts.md
index 5f236e26..30492b9a 100644
--- a/examples/napi/__test__/typegen.spec.ts.md
+++ b/examples/napi/__test__/typegen.spec.ts.md
@@ -217,7 +217,7 @@ Generated by [AVA](https://avajs.dev).
     export type Blake2bHasher = Blake2BHasher␊
     /** Smoking test for type generation */␊
     export class Blake2BHasher {␊
-      static withKey(key: Blake2bKey): Blake2BHasher␊
+      update(data: Buffer): void␊
     }␊
     export type Blake2bKey = Blake2BKey␊
     export class Blake2BKey { }␊
diff --git a/examples/napi/__test__/typegen.spec.ts.snap b/examples/napi/__test__/typegen.spec.ts.snap
index b96a5c92..00747f19 100644
Binary files a/examples/napi/__test__/typegen.spec.ts.snap and b/examples/napi/__test__/typegen.spec.ts.snap differ
diff --git a/examples/napi/index.d.ts b/examples/napi/index.d.ts
index 50da5905..909980ed 100644
--- a/examples/napi/index.d.ts
+++ b/examples/napi/index.d.ts
@@ -207,7 +207,7 @@ export class Bird {
 export type Blake2bHasher = Blake2BHasher
 /** Smoking test for type generation */
 export class Blake2BHasher {
-  static withKey(key: Blake2bKey): Blake2BHasher
+  update(data: Buffer): void
 }
 export type Blake2bKey = Blake2BKey
 export class Blake2BKey { }