fix weird null-pointer error

Author: pufferfish101007

src/wasm/flags.rs

@@ -137,7 +137,12 @@ pub struct WasmFlags {
 
 #[wasm_bindgen]
 impl WasmFlags {
-    // this attribute should be at the item level at `to_js`, but it doesn't seem to work there.
+    // these attributes should be at the item level, but they don't seem to work there.
+    #![expect(
+        clippy::wrong_self_convention,
+        clippy::trivially_copy_pass_by_ref,
+        reason = "to_js taking `self` causes weird errors when wasm-fied"
+    )]
     #![expect(
         clippy::needless_pass_by_value,
         reason = "wasm-bindgen does not support &[T]"
@@ -150,7 +155,7 @@ impl WasmFlags {
     }
 
     #[wasm_bindgen]
-    pub fn to_js(self) -> HQResult<JsValue> {
+    pub fn to_js(&self) -> HQResult<JsValue> {
         serde_wasm_bindgen::to_value(&self)
             .map_err(|_| make_hq_bug!("couldn't convert WasmFlags to JsValue"))
     }