Module ir 

Structs

ClassMethod

DestructureField

FunctionDef

Function definition stored separately (hoisted).

ObjProperty

Program

A complete program — a list of statements.

Span

Span information for error reporting.

SwitchCase

VarDeclarator

Enums

AssignOp

AssignTarget

BinOp

Expr

ForBinding

LogicalOp

ParamPattern

Parameter pattern (simple name or destructuring).

PropKind

Statement

UnaryOp

UpdateOp

VarKind

Type Aliases

ClassBodyParts

Result type for parsing a class body: (constructor, instance methods, static methods).