import { Callable } from "../brsTypes";
/** Converts the string to all uppercase. */
export declare const UCase: Callable;
/** Converts the string to all lowercase. */
export declare const LCase: Callable;
/**
 * Returns the Unicode ("ASCII") value for the first character of the specified string.
 * An empty string argument will return `0`.
 */
export declare const Asc: Callable;
/**
 * Performs the inverse of the `Asc` function: returns a one-character string whose character has
 * the specified Unicode value.
 *
 * Returns empty string (`""`) if the specified value is `0` or an invalid Unicode value.
 */
export declare const Chr: Callable;
/**
 * Returns the first n characters in a string
 */
export declare const Left: Callable;
/**
 * Returns the last n characters in a string
 */
export declare const Right: Callable;
/**
 * Returns the index (1 based) of a string inside another string. Zero if there is no match.
 */
export declare const Instr: Callable;
/**
 * Return the number of characters in a string
 */
export declare const Len: Callable;
/**
 * Return a string located in the middle of another string from start index to end index
 */
export declare const Mid: Callable;
/**
 * Return a string from a float/double. If it is positive, prefix it with a space.
 */
export declare const Str: Callable;
/**
 * Return a string from an integer. If it is positive, prefix it with a space.
 */
export declare const StrI: Callable;
/**
 * Returns a string composed of n copies of the second argument concatenated together.
 */
export declare const STRING: Callable;
/**
 * Returns a string composed of n copies of the character whose Unicode value is the second argument.
 */
export declare const StringI: Callable;
/**
 * Return a string from another string replacing instances of {index} with the
 * respective parameter.
 */
export declare const Substitute: Callable;
/**
 * Return a float or integer from a string
 */
export declare const Val: Callable;
/**
 * Return an integer from a string or 0 if it can't be parsed.
 */
export declare const StrToI: Callable;