/**
 * transforms a value to something R can understand (e.g., booleans to TRUE/FALSE)
 */
export declare function ts2r<T>(value: T): string;
/** The R literal for the logical true */
export declare const RTrue = "TRUE";
/** The R literal for the logical false */
export declare const RFalse = "FALSE";
/**
 * Checks whether the given string is an R boolean (logical) literal.
 */
export declare function isBoolean(value: string): boolean;
/**
 * Converts an R boolean (logical) literal to a TypeScript boolean.
 */
export declare function boolean2ts(value: string): boolean;
export declare const RNumHexFloatRegex: RegExp;
export declare const RImaginaryMarker = "i";
export declare const RIntegerMarker = "L";
export declare const RInf = "Inf";
/**
 * Represents a numeric value in R.
 * If you need to create one from a ts numeric,
 * please use {@link getScalarFromInteger}.
 */
export interface RNumberValue {
    num: number;
    /** see {@link RIntegerMarker}, still, R treats 1.1L as numeric and not especially integer */
    markedAsInt: boolean;
    /** see {@link RImaginaryMarker}, compound imaginary numbers are expressions in R */
    complexNumber: boolean;
}
export declare const RNumberValue: {
    readonly name: "RNumberValue";
    readonly fromRLexeme: (this: void, value: string) => RNumberValue;
};
/**
 * Represents a string value in R, including the type of quotes used and whether it is a raw string.
 */
export interface RStringValue {
    str: string;
    /** from the R-language definition a string is either delimited by a pair of single or double quotes, 'none' strings are syntactically unquoted but treated as strings  */
    quotes: '"' | '\'' | 'none';
    /** a string is raw if prefixed with r */
    flag?: 'raw';
}
/**
 * Checks whether the given string is an R string literal (including raw strings).
 */
export declare const RStringValue: {
    readonly name: "RStringValue";
    /**
     * Convert a valid R string into a {@link RStringValue}.
     * @throws {@link ValueConversionError} if the string has an unknown starting quote
     */
    readonly fromRLexeme: (this: void, value: string) => RStringValue;
};
export declare const RNa = "NA";
export declare const RNull = "NULL";
/**
 * Checks whether the given string is the R NA literal (untyped).
 */
export declare function isNA(value: string): value is (typeof RNa);