export declare enum Types {
    CONSTANT = "CONSTANT",
    NAMED_FUNCTION = "NAMED_FUNCTION",
    OPERATOR = "OPERATOR",
    VARIABLE = "VARIABLE",
    NUMBER = "NUMBER",
    LEFT_PARENTHESIS = "LEFT_PARENTHESIS",
    RIGHT_PARENTHESIS = "RIGHT_PARENTHESIS",
    UNKNOWN = "UNKNOWN"
}
export type OperatorToken = {
    value: string;
    type: Types.OPERATOR | Types.NAMED_FUNCTION;
    args: number;
    precedence: number;
};
export type ConstantToken = {
    value: string;
    type: Types.NUMBER | Types.VARIABLE | Types.LEFT_PARENTHESIS | Types.RIGHT_PARENTHESIS | Types.CONSTANT;
};
export type Token = ConstantToken | OperatorToken;
export type Maybe<T> = T | null;
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