refactor(napi/parser): raw transfer: introduce metadata struct (#12269)

Pure refactor. Introduce a `RawTransferMetadata` struct to hold metadata that gets written to end of buffer. Codegen use knowledge of memory layout of this struct to generate constants added in #12268. This is more robust than manually calculating offsets.

crates/oxc_ast_macros/src/generated/structs.rs

@@ -9,296 +9,297 @@ pub static STRUCTS: phf::Map<&'static str, StructDetails> = ::phf::Map {
     key: 16287231350648472473,
     disps: &[
         (0, 0),
-        (0, 23),
-        (0, 9),
-        (3, 163),
-        (0, 187),
-        (0, 190),
-        (2, 141),
-        (0, 34),
-        (0, 0),
-        (1, 77),
-        (0, 132),
+        (0, 45),
+        (0, 36),
+        (0, 218),
+        (0, 81),
+        (0, 14),
+        (0, 138),
+        (1, 229),
         (0, 0),
+        (0, 21),
+        (0, 100),
+        (0, 11),
+        (0, 3),
+        (0, 10),
+        (0, 139),
+        (0, 84),
+        (0, 196),
+        (0, 3),
+        (4, 222),
+        (0, 86),
+        (0, 163),
+        (1, 155),
+        (0, 125),
+        (103, 2),
+        (5, 195),
+        (0, 79),
         (0, 1),
         (0, 13),
-        (4, 152),
-        (0, 109),
-        (0, 149),
-        (0, 6),
-        (5, 45),
-        (0, 147),
-        (1, 187),
-        (2, 110),
-        (0, 169),
-        (76, 87),
-        (4, 174),
-        (0, 143),
-        (0, 6),
-        (0, 156),
-        (1, 171),
-        (0, 92),
-        (8, 220),
-        (0, 2),
-        (1, 2),
-        (0, 70),
-        (0, 17),
-        (0, 5),
+        (1, 143),
+        (0, 144),
+        (8, 133),
+        (0, 4),
+        (2, 7),
+        (0, 36),
+        (4, 53),
+        (0, 45),
         (0, 0),
-        (2, 160),
-        (2, 38),
-        (7, 223),
-        (60, 63),
-        (1, 114),
-        (0, 23),
-        (4, 66),
-        (0, 126),
-        (0, 26),
+        (3, 70),
+        (26, 191),
+        (3, 107),
+        (4, 187),
+        (1, 108),
+        (0, 39),
+        (0, 49),
+        (11, 199),
+        (0, 14),
     ],
     entries: &[
-        ("TSThisParameter", StructDetails { field_order: None }),
-        ("ChainExpression", StructDetails { field_order: None }),
-        ("CatchParameter", StructDetails { field_order: None }),
-        ("TSImportEqualsDeclaration", StructDetails { field_order: None }),
-        ("Hashbang", StructDetails { field_order: None }),
-        ("JSDocNonNullableType", StructDetails { field_order: None }),
-        ("Quantifier", StructDetails { field_order: Some(&[0, 1, 2, 4, 3]) }),
-        ("NewExpression", StructDetails { field_order: None }),
-        ("LabeledStatement", StructDetails { field_order: None }),
-        (
-            "ArrowFunctionExpression",
-            StructDetails { field_order: Some(&[0, 6, 7, 1, 2, 3, 4, 5, 8]) },
-        ),
-        ("StringLiteral", StructDetails { field_order: None }),
+        ("JSXClosingElement", StructDetails { field_order: None }),
+        ("BindingIdentifier", StructDetails { field_order: None }),
+        ("TSConstructorType", StructDetails { field_order: Some(&[0, 4, 1, 2, 3]) }),
         ("CharacterClass", StructDetails { field_order: Some(&[0, 2, 3, 4, 1]) }),
-        ("IndexedReference", StructDetails { field_order: None }),
-        ("ExportEntry", StructDetails { field_order: Some(&[1, 0, 2, 3, 4, 5, 6]) }),
-        ("CommentNodeId", StructDetails { field_order: None }),
-        (
-            "PropertyDefinition",
-            StructDetails { field_order: Some(&[0, 5, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13]) },
-        ),
-        ("IfStatement", StructDetails { field_order: None }),
-        ("TSLiteralType", StructDetails { field_order: None }),
-        ("TSNullKeyword", StructDetails { field_order: None }),
-        ("TSUnionType", StructDetails { field_order: None }),
-        ("TSTypePredicate", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
-        ("ThrowStatement", StructDetails { field_order: None }),
-        ("BindingProperty", StructDetails { field_order: None }),
-        ("Error", StructDetails { field_order: Some(&[4, 0, 1, 2, 3]) }),
-        ("FunctionBody", StructDetails { field_order: None }),
-        ("TSTemplateLiteralType", StructDetails { field_order: None }),
-        ("TSTypeQuery", StructDetails { field_order: None }),
-        ("ExportSpecifier", StructDetails { field_order: None }),
-        ("TSQualifiedName", StructDetails { field_order: None }),
-        ("ReturnStatement", StructDetails { field_order: None }),
-        ("ExpressionStatement", StructDetails { field_order: None }),
-        ("JSXOpeningElement", StructDetails { field_order: None }),
-        ("JSXSpreadAttribute", StructDetails { field_order: None }),
-        ("CapturingGroup", StructDetails { field_order: None }),
-        ("Pattern", StructDetails { field_order: None }),
-        ("ForInStatement", StructDetails { field_order: None }),
-        ("JSXEmptyExpression", StructDetails { field_order: None }),
-        ("YieldExpression", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("JSDocUnknownType", StructDetails { field_order: None }),
-        ("JSDocNullableType", StructDetails { field_order: None }),
-        ("DebuggerStatement", StructDetails { field_order: None }),
-        ("TSTypeLiteral", StructDetails { field_order: None }),
-        ("ArrayAssignmentTarget", StructDetails { field_order: None }),
-        ("TSMethodSignature", StructDetails { field_order: Some(&[0, 1, 7, 8, 9, 2, 3, 4, 5, 6]) }),
-        ("TSSatisfiesExpression", StructDetails { field_order: None }),
-        ("AssignmentTargetWithDefault", StructDetails { field_order: None }),
-        ("SourceType", StructDetails { field_order: None }),
-        ("AssignmentPattern", StructDetails { field_order: None }),
-        ("ObjectPattern", StructDetails { field_order: None }),
-        ("ScopeId", StructDetails { field_order: None }),
-        ("ArrayPattern", StructDetails { field_order: None }),
-        ("CharacterClassEscape", StructDetails { field_order: None }),
+        ("TSTypeReference", StructDetails { field_order: None }),
+        ("JSXNamespacedName", StructDetails { field_order: None }),
+        ("DoWhileStatement", StructDetails { field_order: None }),
+        ("TSStringKeyword", StructDetails { field_order: None }),
         ("TSTupleType", StructDetails { field_order: None }),
-        ("ConditionalExpression", StructDetails { field_order: None }),
-        ("Program", StructDetails { field_order: Some(&[0, 7, 1, 2, 3, 4, 5, 6]) }),
+        ("ArrayExpression", StructDetails { field_order: None }),
+        ("ImportDefaultSpecifier", StructDetails { field_order: None }),
+        ("AssignmentPattern", StructDetails { field_order: None }),
+        ("TSBooleanKeyword", StructDetails { field_order: None }),
+        ("Span", StructDetails { field_order: None }),
+        ("TSConstructSignatureDeclaration", StructDetails { field_order: None }),
+        ("ForStatement", StructDetails { field_order: None }),
+        ("TSTypeParameterDeclaration", StructDetails { field_order: None }),
+        ("Alternative", StructDetails { field_order: None }),
+        ("PrivateFieldExpression", StructDetails { field_order: None }),
+        ("StringLiteral", StructDetails { field_order: None }),
         (
             "AccessorProperty",
             StructDetails { field_order: Some(&[0, 5, 1, 2, 3, 4, 6, 7, 8, 9, 10]) },
         ),
-        ("Dot", StructDetails { field_order: None }),
-        ("TSNumberKeyword", StructDetails { field_order: None }),
-        ("TSEnumBody", StructDetails { field_order: None }),
-        ("CallExpression", StructDetails { field_order: None }),
-        ("TSInterfaceDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 3, 4, 6, 5]) }),
-        ("UnicodePropertyEscape", StructDetails { field_order: Some(&[0, 3, 4, 1, 2]) }),
-        ("ExportDefaultDeclaration", StructDetails { field_order: None }),
-        ("ImportEntry", StructDetails { field_order: None }),
-        ("ImportExpression", StructDetails { field_order: None }),
-        ("JSXFragment", StructDetails { field_order: None }),
-        ("V8IntrinsicExpression", StructDetails { field_order: None }),
-        ("ThisExpression", StructDetails { field_order: None }),
-        ("StaticBlock", StructDetails { field_order: None }),
-        ("PrivateInExpression", StructDetails { field_order: None }),
-        ("Modifier", StructDetails { field_order: None }),
-        ("PrivateIdentifier", StructDetails { field_order: None }),
-        ("DynamicImport", StructDetails { field_order: None }),
-        ("ReferenceId", StructDetails { field_order: None }),
-        ("TSEnumMember", StructDetails { field_order: None }),
-        ("JSXExpressionContainer", StructDetails { field_order: None }),
-        ("TSNamedTupleMember", StructDetails { field_order: None }),
-        ("TSUndefinedKeyword", StructDetails { field_order: None }),
-        ("TSTypeOperator", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("StaticMemberExpression", StructDetails { field_order: None }),
-        ("StaticImport", StructDetails { field_order: None }),
-        ("TSRestType", StructDetails { field_order: None }),
-        ("Alternative", StructDetails { field_order: None }),
+        ("NullLiteral", StructDetails { field_order: None }),
+        ("ConditionalExpression", StructDetails { field_order: None }),
+        ("ObjectProperty", StructDetails { field_order: Some(&[0, 3, 1, 2, 4, 5, 6]) }),
         ("TaggedTemplateExpression", StructDetails { field_order: None }),
-        ("JSXElement", StructDetails { field_order: None }),
-        ("TSIndexSignatureName", StructDetails { field_order: None }),
-        ("StaticExport", StructDetails { field_order: None }),
-        ("TSParenthesizedType", StructDetails { field_order: None }),
-        ("ObjectAssignmentTarget", StructDetails { field_order: None }),
-        ("RegExpPattern", StructDetails { field_order: None }),
-        ("JSXClosingElement", StructDetails { field_order: None }),
-        ("BooleanLiteral", StructDetails { field_order: None }),
-        ("TSArrayType", StructDetails { field_order: None }),
-        ("TSConstructSignatureDeclaration", StructDetails { field_order: None }),
-        ("TSExportAssignment", StructDetails { field_order: None }),
-        ("TSFunctionType", StructDetails { field_order: None }),
-        ("BindingRestElement", StructDetails { field_order: None }),
-        ("SequenceExpression", StructDetails { field_order: None }),
-        ("Class", StructDetails { field_order: Some(&[0, 9, 1, 2, 3, 4, 5, 6, 7, 10, 11, 8]) }),
-        ("JSXIdentifier", StructDetails { field_order: None }),
-        ("JSXOpeningFragment", StructDetails { field_order: None }),
-        ("LabelIdentifier", StructDetails { field_order: None }),
-        ("CatchClause", StructDetails { field_order: None }),
-        ("TSClassImplements", StructDetails { field_order: None }),
-        ("ErrorLabel", StructDetails { field_order: Some(&[1, 0]) }),
-        ("TSInferType", StructDetails { field_order: None }),
-        ("TSIndexSignature", StructDetails { field_order: None }),
-        ("NonMaxU32", StructDetails { field_order: None }),
-        ("NamedReference", StructDetails { field_order: None }),
-        ("FormalParameter", StructDetails { field_order: None }),
-        ("IgnoreGroup", StructDetails { field_order: None }),
-        ("TSTypeAliasDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 3, 5, 4]) }),
+        ("BlockStatement", StructDetails { field_order: None }),
+        ("BindingProperty", StructDetails { field_order: None }),
         ("TSObjectKeyword", StructDetails { field_order: None }),
         ("TSTypeAssertion", StructDetails { field_order: None }),
-        ("TSConditionalType", StructDetails { field_order: None }),
-        ("RegExp", StructDetails { field_order: None }),
-        ("BreakStatement", StructDetails { field_order: None }),
-        ("Elision", StructDetails { field_order: None }),
-        ("ComputedMemberExpression", StructDetails { field_order: None }),
-        ("ObjectProperty", StructDetails { field_order: Some(&[0, 3, 1, 2, 4, 5, 6]) }),
-        ("PrivateFieldExpression", StructDetails { field_order: None }),
-        ("BigIntLiteral", StructDetails { field_order: None }),
-        ("SpreadElement", StructDetails { field_order: None }),
-        ("TSImportType", StructDetails { field_order: None }),
-        ("JSXSpreadChild", StructDetails { field_order: None }),
-        ("ObjectExpression", StructDetails { field_order: None }),
-        ("JSXText", StructDetails { field_order: None }),
-        ("TSNonNullExpression", StructDetails { field_order: None }),
-        ("WhileStatement", StructDetails { field_order: None }),
-        (
-            "Function",
-            StructDetails { field_order: Some(&[0, 8, 1, 9, 10, 11, 2, 3, 4, 5, 6, 7, 12]) },
-        ),
-        ("Modifiers", StructDetails { field_order: None }),
-        ("TSMappedType", StructDetails { field_order: Some(&[0, 1, 2, 3, 5, 6, 4]) }),
-        ("ClassBody", StructDetails { field_order: None }),
-        ("TSModuleDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 5, 3]) }),
-        ("JSXClosingFragment", StructDetails { field_order: None }),
-        ("ForOfStatement", StructDetails { field_order: Some(&[0, 5, 1, 2, 3, 4]) }),
-        ("TSUnknownKeyword", StructDetails { field_order: None }),
-        ("TSExternalModuleReference", StructDetails { field_order: None }),
-        ("NumericLiteral", StructDetails { field_order: None }),
-        ("Directive", StructDetails { field_order: None }),
-        ("TSIntrinsicKeyword", StructDetails { field_order: None }),
-        ("TSAsExpression", StructDetails { field_order: None }),
-        ("RegExpFlags", StructDetails { field_order: None }),
-        ("ImportSpecifier", StructDetails { field_order: None }),
-        ("TSTypeReference", StructDetails { field_order: None }),
-        ("VariableDeclarator", StructDetails { field_order: Some(&[0, 3, 1, 2, 4]) }),
-        ("CommentNewlines", StructDetails { field_order: None }),
-        ("TryStatement", StructDetails { field_order: None }),
-        ("WithClause", StructDetails { field_order: None }),
-        ("JSXMemberExpression", StructDetails { field_order: None }),
-        ("BindingIdentifier", StructDetails { field_order: None }),
-        ("SymbolId", StructDetails { field_order: None }),
-        ("ClassStringDisjunction", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("LookAroundAssertion", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("IdentifierName", StructDetails { field_order: None }),
-        ("ForStatement", StructDetails { field_order: None }),
-        ("TSInterfaceBody", StructDetails { field_order: None }),
-        ("TemplateElementValue", StructDetails { field_order: None }),
-        ("TSTypeParameterInstantiation", StructDetails { field_order: None }),
+        ("TSQualifiedName", StructDetails { field_order: None }),
         ("Comment", StructDetails { field_order: None }),
-        ("Disjunction", StructDetails { field_order: None }),
-        ("Span", StructDetails { field_order: None }),
-        ("TSIndexedAccessType", StructDetails { field_order: None }),
-        ("SwitchCase", StructDetails { field_order: None }),
-        ("EcmaScriptModule", StructDetails { field_order: Some(&[4, 0, 1, 2, 3]) }),
-        ("BinaryExpression", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
-        ("TSCallSignatureDeclaration", StructDetails { field_order: None }),
-        ("RegExpLiteral", StructDetails { field_order: None }),
-        ("JSXNamespacedName", StructDetails { field_order: None }),
-        ("CharacterClassRange", StructDetails { field_order: None }),
-        ("TSEnumDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 5, 3]) }),
-        ("ExportAllDeclaration", StructDetails { field_order: None }),
-        ("Super", StructDetails { field_order: None }),
-        ("AssignmentTargetPropertyProperty", StructDetails { field_order: None }),
-        ("Decorator", StructDetails { field_order: None }),
-        ("ParenthesizedExpression", StructDetails { field_order: None }),
-        ("AssignmentTargetPropertyIdentifier", StructDetails { field_order: None }),
-        ("BlockStatement", StructDetails { field_order: None }),
-        ("TSTypeParameter", StructDetails { field_order: None }),
-        ("LogicalExpression", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
-        ("TSNeverKeyword", StructDetails { field_order: None }),
-        ("NameSpan", StructDetails { field_order: Some(&[1, 0]) }),
-        ("TSThisType", StructDetails { field_order: None }),
-        ("TSVoidKeyword", StructDetails { field_order: None }),
-        ("TSBooleanKeyword", StructDetails { field_order: None }),
-        ("AssignmentExpression", StructDetails { field_order: Some(&[0, 3, 1, 2]) }),
-        ("RawTransferData", StructDetails { field_order: None }),
-        ("ImportDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 3, 5]) }),
-        ("Character", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("AssignmentTargetRest", StructDetails { field_order: None }),
-        ("BoundaryAssertion", StructDetails { field_order: None }),
-        ("TSBigIntKeyword", StructDetails { field_order: None }),
-        ("JSXAttribute", StructDetails { field_order: None }),
+        ("UnaryExpression", StructDetails { field_order: Some(&[0, 2, 1]) }),
         (
             "MethodDefinition",
             StructDetails { field_order: Some(&[0, 4, 1, 2, 3, 5, 6, 7, 8, 9, 10]) },
         ),
-        ("ClassString", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("TemplateLiteral", StructDetails { field_order: None }),
-        ("IdentifierReference", StructDetails { field_order: None }),
-        ("ImportAttribute", StructDetails { field_order: None }),
-        ("ArrayExpression", StructDetails { field_order: None }),
-        ("EmptyStatement", StructDetails { field_order: None }),
-        ("TSInterfaceHeritage", StructDetails { field_order: None }),
-        ("TSTypeAnnotation", StructDetails { field_order: None }),
-        ("ImportNamespaceSpecifier", StructDetails { field_order: None }),
-        ("TSIntersectionType", StructDetails { field_order: None }),
-        ("AwaitExpression", StructDetails { field_order: None }),
-        ("BindingPattern", StructDetails { field_order: None }),
+        ("CommentNewlines", StructDetails { field_order: None }),
+        ("TSArrayType", StructDetails { field_order: None }),
+        ("Super", StructDetails { field_order: None }),
+        ("LogicalExpression", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
+        ("RegExpFlags", StructDetails { field_order: None }),
+        ("AssignmentExpression", StructDetails { field_order: Some(&[0, 3, 1, 2]) }),
+        ("TSNeverKeyword", StructDetails { field_order: None }),
+        ("TSRestType", StructDetails { field_order: None }),
+        ("TemplateElementValue", StructDetails { field_order: None }),
+        ("V8IntrinsicExpression", StructDetails { field_order: None }),
+        ("YieldExpression", StructDetails { field_order: Some(&[0, 2, 1]) }),
+        ("JSXEmptyExpression", StructDetails { field_order: None }),
+        ("Character", StructDetails { field_order: Some(&[0, 2, 1]) }),
         ("TemplateElement", StructDetails { field_order: None }),
-        ("MetaProperty", StructDetails { field_order: None }),
-        ("TSTypeParameterDeclaration", StructDetails { field_order: None }),
-        ("TSConstructorType", StructDetails { field_order: Some(&[0, 4, 1, 2, 3]) }),
-        ("TSSymbolKeyword", StructDetails { field_order: None }),
-        ("TSNamespaceExportDeclaration", StructDetails { field_order: None }),
-        ("TSStringKeyword", StructDetails { field_order: None }),
-        ("NullLiteral", StructDetails { field_order: None }),
-        ("SwitchStatement", StructDetails { field_order: None }),
-        ("FormalParameters", StructDetails { field_order: Some(&[0, 3, 1, 2]) }),
+        ("BooleanLiteral", StructDetails { field_order: None }),
+        ("StaticImport", StructDetails { field_order: None }),
+        ("ObjectAssignmentTarget", StructDetails { field_order: None }),
+        ("ScopeId", StructDetails { field_order: None }),
+        ("IfStatement", StructDetails { field_order: None }),
+        ("IdentifierName", StructDetails { field_order: None }),
+        ("NonMaxU32", StructDetails { field_order: None }),
+        ("StaticExport", StructDetails { field_order: None }),
+        ("FormalParameter", StructDetails { field_order: None }),
+        ("TSTypeOperator", StructDetails { field_order: Some(&[0, 2, 1]) }),
+        ("Directive", StructDetails { field_order: None }),
+        ("NewExpression", StructDetails { field_order: None }),
+        ("JSXMemberExpression", StructDetails { field_order: None }),
+        ("JSXExpressionContainer", StructDetails { field_order: None }),
+        ("CallExpression", StructDetails { field_order: None }),
+        ("NumericLiteral", StructDetails { field_order: None }),
+        ("ArrayPattern", StructDetails { field_order: None }),
+        ("PrivateInExpression", StructDetails { field_order: None }),
+        ("LabeledStatement", StructDetails { field_order: None }),
+        ("SourceType", StructDetails { field_order: None }),
+        ("TSInterfaceDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 3, 4, 6, 5]) }),
+        ("ImportExpression", StructDetails { field_order: None }),
+        ("TSModuleDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 5, 3]) }),
+        ("VariableDeclarator", StructDetails { field_order: Some(&[0, 3, 1, 2, 4]) }),
+        ("TSIndexedAccessType", StructDetails { field_order: None }),
+        (
+            "Function",
+            StructDetails { field_order: Some(&[0, 8, 1, 9, 10, 11, 2, 3, 4, 5, 6, 7, 12]) },
+        ),
+        ("Error", StructDetails { field_order: Some(&[4, 0, 1, 2, 3]) }),
+        ("JSXFragment", StructDetails { field_order: None }),
+        ("RegExpPattern", StructDetails { field_order: None }),
+        ("JSXClosingFragment", StructDetails { field_order: None }),
+        ("ExportEntry", StructDetails { field_order: Some(&[1, 0, 2, 3, 4, 5, 6]) }),
+        ("WithClause", StructDetails { field_order: None }),
         ("WithStatement", StructDetails { field_order: None }),
+        ("TSInterfaceHeritage", StructDetails { field_order: None }),
+        ("DynamicImport", StructDetails { field_order: None }),
         ("UpdateExpression", StructDetails { field_order: Some(&[0, 2, 3, 1]) }),
-        ("VariableDeclaration", StructDetails { field_order: Some(&[0, 2, 1, 3]) }),
-        ("TSAnyKeyword", StructDetails { field_order: None }),
-        ("UnaryExpression", StructDetails { field_order: Some(&[0, 2, 1]) }),
-        ("TSInstantiationExpression", StructDetails { field_order: None }),
-        ("TSModuleBlock", StructDetails { field_order: None }),
-        ("DoWhileStatement", StructDetails { field_order: None }),
-        ("TSOptionalType", StructDetails { field_order: None }),
-        ("ImportDefaultSpecifier", StructDetails { field_order: None }),
+        ("IndexedReference", StructDetails { field_order: None }),
+        ("JSXIdentifier", StructDetails { field_order: None }),
+        ("TSParenthesizedType", StructDetails { field_order: None }),
+        ("TSIntrinsicKeyword", StructDetails { field_order: None }),
+        ("TSUnionType", StructDetails { field_order: None }),
         ("ExportNamedDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 3, 5, 4]) }),
+        ("DebuggerStatement", StructDetails { field_order: None }),
+        ("TSInferType", StructDetails { field_order: None }),
+        ("SwitchCase", StructDetails { field_order: None }),
+        ("LookAroundAssertion", StructDetails { field_order: Some(&[0, 2, 1]) }),
+        ("Decorator", StructDetails { field_order: None }),
+        ("ClassString", StructDetails { field_order: Some(&[0, 2, 1]) }),
+        ("LabelIdentifier", StructDetails { field_order: None }),
+        ("TSIntersectionType", StructDetails { field_order: None }),
+        ("AssignmentTargetRest", StructDetails { field_order: None }),
+        ("JSXText", StructDetails { field_order: None }),
+        ("RawTransferData", StructDetails { field_order: None }),
+        ("TSNonNullExpression", StructDetails { field_order: None }),
+        ("TSAsExpression", StructDetails { field_order: None }),
+        ("BinaryExpression", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
+        ("ForOfStatement", StructDetails { field_order: Some(&[0, 5, 1, 2, 3, 4]) }),
+        ("TSUnknownKeyword", StructDetails { field_order: None }),
+        ("TSNullKeyword", StructDetails { field_order: None }),
+        ("Pattern", StructDetails { field_order: None }),
+        ("ImportAttribute", StructDetails { field_order: None }),
+        ("ParenthesizedExpression", StructDetails { field_order: None }),
+        ("SequenceExpression", StructDetails { field_order: None }),
+        ("AssignmentTargetPropertyProperty", StructDetails { field_order: None }),
+        ("ArrayAssignmentTarget", StructDetails { field_order: None }),
+        ("FormalParameters", StructDetails { field_order: Some(&[0, 3, 1, 2]) }),
+        ("CharacterClassEscape", StructDetails { field_order: None }),
+        ("TSSatisfiesExpression", StructDetails { field_order: None }),
+        ("JSDocNonNullableType", StructDetails { field_order: None }),
+        ("NameSpan", StructDetails { field_order: Some(&[1, 0]) }),
+        ("TSExportAssignment", StructDetails { field_order: None }),
+        ("TSExternalModuleReference", StructDetails { field_order: None }),
+        ("TSTypeLiteral", StructDetails { field_order: None }),
+        ("JSDocUnknownType", StructDetails { field_order: None }),
+        ("TSThisType", StructDetails { field_order: None }),
+        ("TSThisParameter", StructDetails { field_order: None }),
+        ("TSTypeParameterInstantiation", StructDetails { field_order: None }),
+        ("Disjunction", StructDetails { field_order: None }),
+        ("ReferenceId", StructDetails { field_order: None }),
+        ("TSCallSignatureDeclaration", StructDetails { field_order: None }),
+        ("Quantifier", StructDetails { field_order: Some(&[0, 1, 2, 4, 3]) }),
+        ("TSAnyKeyword", StructDetails { field_order: None }),
+        ("TSOptionalType", StructDetails { field_order: None }),
+        ("TSIndexSignatureName", StructDetails { field_order: None }),
+        ("TSEnumDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 5, 3]) }),
+        ("MetaProperty", StructDetails { field_order: None }),
+        ("TSNumberKeyword", StructDetails { field_order: None }),
+        ("TSIndexSignature", StructDetails { field_order: None }),
+        ("CatchParameter", StructDetails { field_order: None }),
+        ("CatchClause", StructDetails { field_order: None }),
+        ("ReturnStatement", StructDetails { field_order: None }),
+        ("ImportEntry", StructDetails { field_order: None }),
+        ("SwitchStatement", StructDetails { field_order: None }),
+        ("FunctionBody", StructDetails { field_order: None }),
+        ("TSTypeParameter", StructDetails { field_order: None }),
+        ("ObjectPattern", StructDetails { field_order: None }),
+        ("ThrowStatement", StructDetails { field_order: None }),
+        ("ExportSpecifier", StructDetails { field_order: None }),
+        ("BoundaryAssertion", StructDetails { field_order: None }),
+        ("TSTypeAliasDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 3, 5, 4]) }),
+        ("BindingPattern", StructDetails { field_order: None }),
+        ("ThisExpression", StructDetails { field_order: None }),
+        ("RegExpLiteral", StructDetails { field_order: None }),
+        ("JSDocNullableType", StructDetails { field_order: None }),
+        ("SymbolId", StructDetails { field_order: None }),
+        ("AssignmentTargetPropertyIdentifier", StructDetails { field_order: None }),
+        ("ObjectExpression", StructDetails { field_order: None }),
+        ("NamedReference", StructDetails { field_order: None }),
+        ("ImportDeclaration", StructDetails { field_order: Some(&[0, 1, 2, 4, 3, 5]) }),
+        ("ChainExpression", StructDetails { field_order: None }),
+        ("JSXSpreadChild", StructDetails { field_order: None }),
+        ("TSTypeQuery", StructDetails { field_order: None }),
+        ("WhileStatement", StructDetails { field_order: None }),
+        ("TemplateLiteral", StructDetails { field_order: None }),
+        ("TSFunctionType", StructDetails { field_order: None }),
+        (
+            "PropertyDefinition",
+            StructDetails { field_order: Some(&[0, 5, 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13]) },
+        ),
+        ("RegExp", StructDetails { field_order: None }),
+        ("JSXSpreadAttribute", StructDetails { field_order: None }),
+        ("TSClassImplements", StructDetails { field_order: None }),
+        ("StaticMemberExpression", StructDetails { field_order: None }),
+        ("Class", StructDetails { field_order: Some(&[0, 9, 1, 2, 3, 4, 5, 6, 7, 10, 11, 8]) }),
+        ("ClassStringDisjunction", StructDetails { field_order: Some(&[0, 2, 1]) }),
+        ("PrivateIdentifier", StructDetails { field_order: None }),
+        ("EmptyStatement", StructDetails { field_order: None }),
+        ("AssignmentTargetWithDefault", StructDetails { field_order: None }),
+        ("TSModuleBlock", StructDetails { field_order: None }),
+        ("ForInStatement", StructDetails { field_order: None }),
+        ("TSNamedTupleMember", StructDetails { field_order: None }),
+        ("BindingRestElement", StructDetails { field_order: None }),
+        ("Hashbang", StructDetails { field_order: None }),
+        ("TSLiteralType", StructDetails { field_order: None }),
+        ("TSBigIntKeyword", StructDetails { field_order: None }),
+        ("TSConditionalType", StructDetails { field_order: None }),
+        ("CapturingGroup", StructDetails { field_order: None }),
+        ("ExportDefaultDeclaration", StructDetails { field_order: None }),
+        ("Modifier", StructDetails { field_order: None }),
+        ("UnicodePropertyEscape", StructDetails { field_order: Some(&[0, 3, 4, 1, 2]) }),
+        ("TSMappedType", StructDetails { field_order: Some(&[0, 1, 2, 3, 5, 6, 4]) }),
+        ("TSSymbolKeyword", StructDetails { field_order: None }),
+        ("VariableDeclaration", StructDetails { field_order: Some(&[0, 2, 1, 3]) }),
+        ("Program", StructDetails { field_order: Some(&[0, 7, 1, 2, 3, 4, 5, 6]) }),
+        ("TSInterfaceBody", StructDetails { field_order: None }),
+        ("TryStatement", StructDetails { field_order: None }),
+        ("AwaitExpression", StructDetails { field_order: None }),
         ("TSPropertySignature", StructDetails { field_order: Some(&[0, 3, 4, 5, 1, 2]) }),
+        ("TSImportEqualsDeclaration", StructDetails { field_order: None }),
+        ("ImportNamespaceSpecifier", StructDetails { field_order: None }),
+        ("TSEnumMember", StructDetails { field_order: None }),
+        ("IdentifierReference", StructDetails { field_order: None }),
+        ("TSUndefinedKeyword", StructDetails { field_order: None }),
+        ("TSMethodSignature", StructDetails { field_order: Some(&[0, 1, 7, 8, 9, 2, 3, 4, 5, 6]) }),
+        ("ExpressionStatement", StructDetails { field_order: None }),
+        ("SpreadElement", StructDetails { field_order: None }),
+        ("TSVoidKeyword", StructDetails { field_order: None }),
+        ("TSTemplateLiteralType", StructDetails { field_order: None }),
+        ("Modifiers", StructDetails { field_order: None }),
+        ("BreakStatement", StructDetails { field_order: None }),
+        ("JSXOpeningFragment", StructDetails { field_order: None }),
+        ("ClassBody", StructDetails { field_order: None }),
         ("ContinueStatement", StructDetails { field_order: None }),
+        ("JSXOpeningElement", StructDetails { field_order: None }),
+        ("TSEnumBody", StructDetails { field_order: None }),
+        ("Dot", StructDetails { field_order: None }),
+        ("ImportSpecifier", StructDetails { field_order: None }),
+        ("BigIntLiteral", StructDetails { field_order: None }),
+        ("ExportAllDeclaration", StructDetails { field_order: None }),
+        ("EcmaScriptModule", StructDetails { field_order: Some(&[4, 0, 1, 2, 3]) }),
+        ("TSInstantiationExpression", StructDetails { field_order: None }),
+        ("JSXAttribute", StructDetails { field_order: None }),
+        ("TSTypePredicate", StructDetails { field_order: Some(&[0, 1, 3, 2]) }),
+        ("ErrorLabel", StructDetails { field_order: Some(&[1, 0]) }),
+        ("TSNamespaceExportDeclaration", StructDetails { field_order: None }),
+        ("TSImportType", StructDetails { field_order: None }),
+        ("JSXElement", StructDetails { field_order: None }),
+        ("IgnoreGroup", StructDetails { field_order: None }),
+        ("Elision", StructDetails { field_order: None }),
+        ("ComputedMemberExpression", StructDetails { field_order: None }),
+        ("TSTypeAnnotation", StructDetails { field_order: None }),
+        ("CharacterClassRange", StructDetails { field_order: None }),
+        ("RawTransferMetadata", StructDetails { field_order: Some(&[1, 2, 0]) }),
+        ("CommentNodeId", StructDetails { field_order: None }),
+        ("StaticBlock", StructDetails { field_order: None }),
+        (
+            "ArrowFunctionExpression",
+            StructDetails { field_order: Some(&[0, 6, 7, 1, 2, 3, 4, 5, 8]) },
+        ),
     ],
 };

napi/parser/generated/constants.js

@@ -3,8 +3,8 @@
 
 const BUFFER_SIZE = 2147483648,
   BUFFER_ALIGN = 4294967296,
-  DATA_POINTER_POS_32 = 536870908,
-  IS_TS_FLAG_POS = 2147483636,
+  DATA_POINTER_POS_32 = 536870910,
+  IS_TS_FLAG_POS = 2147483644,
   PROGRAM_OFFSET = 0;
 
 module.exports = {

napi/parser/generated/deserialize/js.js

@@ -20,7 +20,7 @@ function deserialize(buffer, sourceTextInput, sourceLenInput) {
   sourceLen = sourceLenInput;
   sourceIsAscii = sourceText.length === sourceLen;
 
-  const data = deserializeRawTransferData(uint32[536870908]);
+  const data = deserializeRawTransferData(uint32[536870910]);
 
   uint8 =
     uint32 =

napi/parser/generated/deserialize/ts.js

@@ -20,7 +20,7 @@ function deserialize(buffer, sourceTextInput, sourceLenInput) {
   sourceLen = sourceLenInput;
   sourceIsAscii = sourceText.length === sourceLen;
 
-  const data = deserializeRawTransferData(uint32[536870908]);
+  const data = deserializeRawTransferData(uint32[536870910]);
 
   uint8 =
     uint32 =

napi/parser/src/generated/assert_layouts.rs

@@ -17,6 +17,13 @@ const _: () = {
     assert!(offset_of!(RawTransferData, module) == 152);
     assert!(offset_of!(RawTransferData, errors) == 256);
 
+    // Padding: 3 bytes
+    assert!(size_of::<RawTransferMetadata>() == 16);
+    assert!(align_of::<RawTransferMetadata>() == 8);
+    assert!(offset_of!(RawTransferMetadata, data_offset) == 8);
+    assert!(offset_of!(RawTransferMetadata, is_ts) == 12);
+    assert!(offset_of!(RawTransferMetadata, _padding) == 0);
+
     // Padding: 7 bytes
     assert!(size_of::<Error>() == 80);
     assert!(align_of::<Error>() == 8);
@@ -68,6 +75,13 @@ const _: () = {
     assert!(offset_of!(RawTransferData, module) == 104);
     assert!(offset_of!(RawTransferData, errors) == 172);
 
+    // Padding: 3 bytes
+    assert!(size_of::<RawTransferMetadata>() == 16);
+    assert!(align_of::<RawTransferMetadata>() == 8);
+    assert!(offset_of!(RawTransferMetadata, data_offset) == 8);
+    assert!(offset_of!(RawTransferMetadata, is_ts) == 12);
+    assert!(offset_of!(RawTransferMetadata, _padding) == 0);
+
     // Padding: 3 bytes
     assert!(size_of::<Error>() == 44);
     assert!(align_of::<Error>() == 4);

napi/parser/src/raw_transfer.rs

@@ -20,7 +20,7 @@ use oxc_napi::get_source_type;
 use crate::{
     AstType, ParserOptions, get_ast_type, parse,
     raw_transfer_constants::{BUFFER_ALIGN, BUFFER_SIZE},
-    raw_transfer_types::{EcmaScriptModule, Error, RawTransferData},
+    raw_transfer_types::{EcmaScriptModule, Error, RawTransferData, RawTransferMetadata},
 };
 
 // For raw transfer, use a buffer 2 GiB in size, with 4 GiB alignment.
@@ -179,10 +179,10 @@ unsafe fn parse_raw_impl(
     assert!(is_multiple_of(buffer_ptr as usize, BUFFER_ALIGN));
 
     // Get offsets and size of data region to be managed by arena allocator.
-    // Leave space for source before it, and 16 bytes for metadata after it.
+    // Leave space for source before it, and space for metadata after it.
     // Metadata actually only takes 5 bytes, but round everything up to multiple of 16,
     // as `bumpalo` requires that alignment.
-    const METADATA_SIZE: usize = 16;
+    const METADATA_SIZE: usize = size_of::<RawTransferMetadata>();
     const {
         assert!(METADATA_SIZE >= BUMP_ALIGN);
         assert!(is_multiple_of(METADATA_SIZE, BUMP_ALIGN));
@@ -271,15 +271,16 @@ unsafe fn parse_raw_impl(
         ptr::from_ref(data).cast::<u8>()
     };
 
-    // Write offset of `RawTransferData` and `bool` representing AST type into end of buffer
+    // Write metadata into end of buffer
     #[allow(clippy::cast_possible_truncation)]
-    let data_offset = data_ptr as u32;
+    let metadata = RawTransferMetadata::new(data_ptr as u32, ast_type == AstType::TypeScript);
     const METADATA_OFFSET: usize = BUFFER_SIZE - METADATA_SIZE;
-    // SAFETY: `METADATA_OFFSET` is less than length of `buffer`
+    const _: () = assert!(is_multiple_of(METADATA_OFFSET, BUMP_ALIGN));
+    // SAFETY: `METADATA_OFFSET` is less than length of `buffer`.
+    // `METADATA_OFFSET` is aligned on 16.
     #[expect(clippy::cast_ptr_alignment)]
     unsafe {
-        buffer_ptr.add(METADATA_OFFSET).cast::<u32>().write(data_offset);
-        buffer_ptr.add(METADATA_OFFSET + 4).cast::<bool>().write(ast_type == AstType::TypeScript);
+        buffer_ptr.add(METADATA_OFFSET).cast::<RawTransferMetadata>().write(metadata);
     }
 }
 

napi/parser/src/raw_transfer_types.rs

@@ -25,6 +25,23 @@ pub struct RawTransferData<'a> {
     pub errors: Vec<'a, Error<'a>>,
 }
 
+/// Metadata written to end of buffer.
+#[ast]
+pub struct RawTransferMetadata {
+    /// Offset of `RawTransferData` within buffer.
+    pub data_offset: u32,
+    /// `true` if AST is TypeScript.
+    pub is_ts: bool,
+    /// Padding to pad struct to size 16.
+    pub(crate) _padding: u64,
+}
+
+impl RawTransferMetadata {
+    pub fn new(data_offset: u32, is_ts: bool) -> Self {
+        Self { data_offset, is_ts, _padding: 0 }
+    }
+}
+
 // Errors.
 //
 // These types and the `From` / `FromIn` impls mirror the implementation in `types.rs`

tasks/ast_tools/src/generators/raw_transfer.rs

@@ -32,10 +32,6 @@ const BUFFER_SIZE: u32 = 1 << 31; // 2 GiB
 const _: () = assert!(BUFFER_SIZE % 16 == 0);
 /// Alignment of raw transfer buffer.
 const BUFFER_ALIGN: u64 = 1 << 32; // 4 GiB
-/// Size of metadata written to end of buffer.
-const METADATA_SIZE: u32 = 16;
-/// Offset of flag for whether AST is TypeScript or not, relative to start of metadata.
-const IS_TS_FLAG_OFFSET: u32 = 4;
 
 // Offsets of `Vec`'s fields.
 // `Vec` is `#[repr(transparent)]` and `RawVec` is `#[repr(C)]`, so these offsets are fixed.
@@ -1020,9 +1016,11 @@ fn generate_constants(consts: Constants) -> (String, TokenStream) {
 
 /// Calculate constants.
 fn get_constants(schema: &Schema) -> Constants {
-    let metadata_pos = BUFFER_SIZE - METADATA_SIZE;
-    let data_pointer_pos_32 = metadata_pos / 4;
-    let is_ts_pos = metadata_pos + IS_TS_FLAG_OFFSET;
+    let metadata_struct = schema.type_by_name("RawTransferMetadata").as_struct().unwrap();
+    let metadata_pos = BUFFER_SIZE - metadata_struct.layout_64().size;
+    let data_pointer_pos = metadata_pos + metadata_struct.field_by_name("data_offset").offset_64();
+    let data_pointer_pos_32 = data_pointer_pos / 4;
+    let is_ts_pos = metadata_pos + metadata_struct.field_by_name("is_ts").offset_64();
 
     let program_offset = schema
         .type_by_name("RawTransferData")