\chapter{Generated code from Protocol buffers}

\begin{lstlisting}[language={JavaScript},caption={TypesScript types of Type Expression AST},label={ex:typeExpressionTypes}]
export interface Identifier extends WildcardNode {
    nodeType: "Identifier";
    name: string;
}

export interface Wildcard {
    nodeType: "Wildcard";
    identifier: Identifier;
    expr: TypeExpr;
    star: boolean;
}

export interface WildcardNode {
    nodeType: "BinaryExpr" | "UnaryExpr" | "GroupExpr" | "Identifier";
}

export type TypeExpr = BinaryExpr | UnaryExpr | PrimitiveExpr;

export type BinaryOperator = "||" | "&&";

export type UnaryOperator = "!";

export interface BinaryExpr extends WildcardNode {
    nodeType: "BinaryExpr";
    left: UnaryExpr | BinaryExpr | PrimitiveExpr;
    op: BinaryOperator;
    right: UnaryExpr | BinaryExpr | PrimitiveExpr;
}
export interface UnaryExpr extends WildcardNode {
    nodeType: "UnaryExpr";
    op: UnaryOperator;
    expr: PrimitiveExpr;
}

export type PrimitiveExpr = GroupExpr | Identifier;

export interface GroupExpr extends WildcardNode {
    nodeType: "GroupExpr";
    expr: TypeExpr;
}
\end{lstlisting}