type TokenType =  "operator" | "doubleQuote" | "identifier" | "(end)";



interface Token {
    type: TokenType;
    value: string;
    pos: number;
}

interface PosTokenOp {
    type: "operator" | TokenType ;
    value: string;
    pos: number;
    left: Token | null;
    right: Token | null;
}

interface PosTokenOp {
    type: "operator" ;
    value: string;
    pos: number;
    left: Token | null;
    right: Token | null;
}