/**
 * An alphabet is an ordered set of characters
 */
export interface Alphabet extends Iterable<string> {
    /**
     * Gets the count of characters in the alphabet
     */
    readonly length: number;
    /**
     * Gets the character in the specified index
     * @param index The 0-based index of the character to retrieve
     */
    getAt(index: number): string;
    /**
     * Gets the 0-based ordinal of the character in the alphabet
     * @param char The character to get ordinal of
     */
    indexOf(char: string): number;
    /**
     * Checks if the character is contained alphabet
     * @param char The character to check
     */
    has(char: string): boolean;
}
/**
 * All characters that serve as representation of a digit (E.G. in a case-insensitive
 * base, `['a', 'A']` represents the same digit)
 */
export declare type DigitVariants = string[];
/**
 * Represent an Nth base of a positional numeral system
 */
export interface NthBase {
    /** Gets the base radix value (N) */
    readonly radix: number;
    /**
     * Gets an an ordered array of the digits in the base (first equals 0, second 1, etc.)
     */
    readonly digits: readonly DigitVariants[];
    /**
     * Gets a record that maps from digits to their value
     */
    readonly values: Readonly<Record<string, number>>;
}