[Bugfix] Escape enum literals starting with underscore

packages/graphql_codegen/lib/src/printer/utils.dart

@@ -182,7 +182,8 @@ class NamePrinter {
   String printKeywordSafe(String name) =>
       _keywords.contains(name) ? "\$${name}" : name;
 
-  String printEnumValueName(NameNode name) => printKeywordSafe(name.value);
+  String printEnumValueName(NameNode name) =>
+      _printPropertyNameString(name.value);
 
   String printPropertyName(NameNode name) =>
       _printPropertyNameString(name.value);

packages/graphql_codegen/test/assets/private_enum_literals/schema.graphql

@@ -0,0 +1,4 @@
+enum CustomEnum {
+    nonPrivateLiteral
+    _privateLiteral
+}

packages/graphql_codegen/test/assets/private_enum_literals/schema.graphql.dart

@@ -0,0 +1,196 @@
+enum Enum$CustomEnum { nonPrivateLiteral, $_privateLiteral, $unknown }
+
+String toJson$Enum$CustomEnum(Enum$CustomEnum e) {
+  switch (e) {
+    case Enum$CustomEnum.nonPrivateLiteral:
+      return r'nonPrivateLiteral';
+    case Enum$CustomEnum.$_privateLiteral:
+      return r'_privateLiteral';
+    case Enum$CustomEnum.$unknown:
+      return r'$unknown';
+  }
+}
+
+Enum$CustomEnum fromJson$Enum$CustomEnum(String value) {
+  switch (value) {
+    case r'nonPrivateLiteral':
+      return Enum$CustomEnum.nonPrivateLiteral;
+    case r'_privateLiteral':
+      return Enum$CustomEnum.$_privateLiteral;
+    default:
+      return Enum$CustomEnum.$unknown;
+  }
+}
+
+enum Enum$__TypeKind {
+  SCALAR,
+  OBJECT,
+  INTERFACE,
+  UNION,
+  ENUM,
+  INPUT_OBJECT,
+  LIST,
+  NON_NULL,
+  $unknown
+}
+
+String toJson$Enum$__TypeKind(Enum$__TypeKind e) {
+  switch (e) {
+    case Enum$__TypeKind.SCALAR:
+      return r'SCALAR';
+    case Enum$__TypeKind.OBJECT:
+      return r'OBJECT';
+    case Enum$__TypeKind.INTERFACE:
+      return r'INTERFACE';
+    case Enum$__TypeKind.UNION:
+      return r'UNION';
+    case Enum$__TypeKind.ENUM:
+      return r'ENUM';
+    case Enum$__TypeKind.INPUT_OBJECT:
+      return r'INPUT_OBJECT';
+    case Enum$__TypeKind.LIST:
+      return r'LIST';
+    case Enum$__TypeKind.NON_NULL:
+      return r'NON_NULL';
+    case Enum$__TypeKind.$unknown:
+      return r'$unknown';
+  }
+}
+
+Enum$__TypeKind fromJson$Enum$__TypeKind(String value) {
+  switch (value) {
+    case r'SCALAR':
+      return Enum$__TypeKind.SCALAR;
+    case r'OBJECT':
+      return Enum$__TypeKind.OBJECT;
+    case r'INTERFACE':
+      return Enum$__TypeKind.INTERFACE;
+    case r'UNION':
+      return Enum$__TypeKind.UNION;
+    case r'ENUM':
+      return Enum$__TypeKind.ENUM;
+    case r'INPUT_OBJECT':
+      return Enum$__TypeKind.INPUT_OBJECT;
+    case r'LIST':
+      return Enum$__TypeKind.LIST;
+    case r'NON_NULL':
+      return Enum$__TypeKind.NON_NULL;
+    default:
+      return Enum$__TypeKind.$unknown;
+  }
+}
+
+enum Enum$__DirectiveLocation {
+  QUERY,
+  MUTATION,
+  SUBSCRIPTION,
+  FIELD,
+  FRAGMENT_DEFINITION,
+  FRAGMENT_SPREAD,
+  INLINE_FRAGMENT,
+  VARIABLE_DEFINITION,
+  SCHEMA,
+  SCALAR,
+  OBJECT,
+  FIELD_DEFINITION,
+  ARGUMENT_DEFINITION,
+  INTERFACE,
+  UNION,
+  ENUM,
+  ENUM_VALUE,
+  INPUT_OBJECT,
+  INPUT_FIELD_DEFINITION,
+  $unknown
+}
+
+String toJson$Enum$__DirectiveLocation(Enum$__DirectiveLocation e) {
+  switch (e) {
+    case Enum$__DirectiveLocation.QUERY:
+      return r'QUERY';
+    case Enum$__DirectiveLocation.MUTATION:
+      return r'MUTATION';
+    case Enum$__DirectiveLocation.SUBSCRIPTION:
+      return r'SUBSCRIPTION';
+    case Enum$__DirectiveLocation.FIELD:
+      return r'FIELD';
+    case Enum$__DirectiveLocation.FRAGMENT_DEFINITION:
+      return r'FRAGMENT_DEFINITION';
+    case Enum$__DirectiveLocation.FRAGMENT_SPREAD:
+      return r'FRAGMENT_SPREAD';
+    case Enum$__DirectiveLocation.INLINE_FRAGMENT:
+      return r'INLINE_FRAGMENT';
+    case Enum$__DirectiveLocation.VARIABLE_DEFINITION:
+      return r'VARIABLE_DEFINITION';
+    case Enum$__DirectiveLocation.SCHEMA:
+      return r'SCHEMA';
+    case Enum$__DirectiveLocation.SCALAR:
+      return r'SCALAR';
+    case Enum$__DirectiveLocation.OBJECT:
+      return r'OBJECT';
+    case Enum$__DirectiveLocation.FIELD_DEFINITION:
+      return r'FIELD_DEFINITION';
+    case Enum$__DirectiveLocation.ARGUMENT_DEFINITION:
+      return r'ARGUMENT_DEFINITION';
+    case Enum$__DirectiveLocation.INTERFACE:
+      return r'INTERFACE';
+    case Enum$__DirectiveLocation.UNION:
+      return r'UNION';
+    case Enum$__DirectiveLocation.ENUM:
+      return r'ENUM';
+    case Enum$__DirectiveLocation.ENUM_VALUE:
+      return r'ENUM_VALUE';
+    case Enum$__DirectiveLocation.INPUT_OBJECT:
+      return r'INPUT_OBJECT';
+    case Enum$__DirectiveLocation.INPUT_FIELD_DEFINITION:
+      return r'INPUT_FIELD_DEFINITION';
+    case Enum$__DirectiveLocation.$unknown:
+      return r'$unknown';
+  }
+}
+
+Enum$__DirectiveLocation fromJson$Enum$__DirectiveLocation(String value) {
+  switch (value) {
+    case r'QUERY':
+      return Enum$__DirectiveLocation.QUERY;
+    case r'MUTATION':
+      return Enum$__DirectiveLocation.MUTATION;
+    case r'SUBSCRIPTION':
+      return Enum$__DirectiveLocation.SUBSCRIPTION;
+    case r'FIELD':
+      return Enum$__DirectiveLocation.FIELD;
+    case r'FRAGMENT_DEFINITION':
+      return Enum$__DirectiveLocation.FRAGMENT_DEFINITION;
+    case r'FRAGMENT_SPREAD':
+      return Enum$__DirectiveLocation.FRAGMENT_SPREAD;
+    case r'INLINE_FRAGMENT':
+      return Enum$__DirectiveLocation.INLINE_FRAGMENT;
+    case r'VARIABLE_DEFINITION':
+      return Enum$__DirectiveLocation.VARIABLE_DEFINITION;
+    case r'SCHEMA':
+      return Enum$__DirectiveLocation.SCHEMA;
+    case r'SCALAR':
+      return Enum$__DirectiveLocation.SCALAR;
+    case r'OBJECT':
+      return Enum$__DirectiveLocation.OBJECT;
+    case r'FIELD_DEFINITION':
+      return Enum$__DirectiveLocation.FIELD_DEFINITION;
+    case r'ARGUMENT_DEFINITION':
+      return Enum$__DirectiveLocation.ARGUMENT_DEFINITION;
+    case r'INTERFACE':
+      return Enum$__DirectiveLocation.INTERFACE;
+    case r'UNION':
+      return Enum$__DirectiveLocation.UNION;
+    case r'ENUM':
+      return Enum$__DirectiveLocation.ENUM;
+    case r'ENUM_VALUE':
+      return Enum$__DirectiveLocation.ENUM_VALUE;
+    case r'INPUT_OBJECT':
+      return Enum$__DirectiveLocation.INPUT_OBJECT;
+    case r'INPUT_FIELD_DEFINITION':
+      return Enum$__DirectiveLocation.INPUT_FIELD_DEFINITION;
+    default:
+      return Enum$__DirectiveLocation.$unknown;
+  }
+}
+
+const possibleTypesMap = <String, Set<String>>{};