feat(napi): add experimental flag

crates/napi/Cargo.toml

@@ -11,9 +11,10 @@ version = "2.0.0-beta.1"
 
 [features]
 async = ["tokio_rt"]
+experimental = ["napi-sys/experimental"]
 compat-mode = []
 default = ["napi3", "compat-mode"] # for most Node.js users
-full = ["latin1", "napi8", "async", "serde-json"]
+full = ["latin1", "napi8", "async", "serde-json", "experimental"]
 latin1 = ["encoding_rs"]
 napi1 = []
 napi2 = ["napi1"]

crates/napi/src/error.rs

@@ -151,6 +151,9 @@ pub struct JsTypeError(Error);
 
 pub struct JsRangeError(Error);
 
+#[cfg(feature = "experimental")]
+pub struct JsSyntaxError(Error);
+
 macro_rules! impl_object_methods {
   ($js_value:ident, $kind:expr) => {
     impl $js_value {