Added nullish coaslecing operator to FeatureSet
@@ -184,6 +184,9 @@ public final class FeatureSet implements Serializable {
DYNAMIC_IMPORT("Dynamic module import", LangVersion.ES_UNSUPPORTED),
IMPORT_META("import.meta", LangVersion.ES_UNSUPPORTED),
+ // ES 2020 Stage 4
+ NULL_COALESCE_OP("Nullish coalescing", LangVersion.ES_UNSUPPORTED),
+
// ES6 typed features that are not at all implemented in browsers
ACCESSIBILITY_MODIFIER("accessibility modifier", LangVersion.TYPESCRIPT),
AMBIENT_DECLARATION("ambient declaration", LangVersion.TYPESCRIPT),
