Module ast 

JavaScript abstract syntax tree.

Every node here has a direct lowering in compiler.rs. JS is statement-oriented with brace-delimited blocks, so the tree separates Stmt (blocks of these form a program/function body) from Expr. Numbers are all IEEE-754 f64, matching JavaScript’s single number type.

Structs

ClassMember

One member of a class body: a method, accessor, or field, on the instance or static side.

ClassNode

A class declaration/expression body.

Declarator

A single declarator inside a var/let/const.

Param

A formal parameter.

Stmt

A statement plus its 1-based source line.

SwitchCase

One case/default clause of a switch.

Enums

AssignOp

The operator carried by a COMPOUND assignment (a += b, a ??= b).

BinOp

A binary operator (a <op> b). &&/||/?? are LogicalOp because they short-circuit and yield an operand value, not a coerced boolean.

DeclKind

The kind of a variable declaration.

Expr

A JavaScript expression.

FnBody

A function/arrow body: either a brace-delimited statement list or (arrow) a single expression whose value is returned.

LogicalOp

A short-circuiting logical operator.

MemberKind

The kind of a class member.

Prop

A property of an object literal.

StmtKind

A JavaScript statement.

UnOp

A unary prefix operator.

UpdateOp

The update (increment/decrement) operator, prefix or postfix.

Type Aliases

Span

A source range as UTF-8 byte offsets (start, end) into the text the parser read. (0, 0) means none was recorded (a ${…} template field is re-parsed from a copy, so its offsets would not point into the script). Function.prototype.toString returns this slice (20.2.3.5).