fix(wasm): serialize map as a plain object (#6781)

siketyan · web-flow · commit 9bbd34f8d4be · 2025-07-08T22:52:30.000+09:00
diff --git a/.changeset/flat-wolves-fall.md b/.changeset/flat-wolves-fall.md
@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed the `FileFeaturesResult` interface in the WASM API was defined as a mapped object but the actual value was a `Map` object.
diff --git a/crates/biome_wasm/src/lib.rs b/crates/biome_wasm/src/lib.rs
@@ -266,8 +266,12 @@ impl Default for Workspace {
     }
 }
 
+const SERIALIZER: serde_wasm_bindgen::Serializer = serde_wasm_bindgen::Serializer::new()
+    .serialize_missing_as_null(true)
+    .serialize_maps_as_objects(true);
+
 fn to_value<T: serde::ser::Serialize + ?Sized>(
     value: &T,
 ) -> Result<JsValue, serde_wasm_bindgen::Error> {
-    value.serialize(&serde_wasm_bindgen::Serializer::new().serialize_missing_as_null(true))
+    value.serialize(&SERIALIZER)
 }

-Original file line number
+Diff line change
@@ @@ -0,0 +1,5 @@ @@
 +---
 +"@biomejs/biome": patch
 +---
++
 +Fixed the `FileFeaturesResult` interface in the WASM API was defined as a mapped object but the actual value was a `Map` object.
Original file line number	Diff line number	Diff line change
`@@ -266,8 +266,12 @@ impl Default for Workspace {`
`266`	`266`	`}`
`267`	`267`	`}`
`268`	`268`
	`269`	`+const SERIALIZER: serde_wasm_bindgen::Serializer = serde_wasm_bindgen::Serializer::new()`
	`270`	`+ .serialize_missing_as_null(true)`
	`271`	`+ .serialize_maps_as_objects(true);`
	`272`	`+`
`269`	`273`	`fn to_value<T: serde::ser::Serialize + ?Sized>(`
`270`	`274`	`value: 4C59 &T,`
`271`	`275`	`) -> Result<JsValue, serde_wasm_bindgen::Error> {`
`272`		`- value.serialize(&serde_wasm_bindgen::Serializer::new().serialize_missing_as_null(true))`
	`276`	`+ value.serialize(&SERIALIZER)`
`273`	`277`	`}`