/**
 * Returns a centered subsequence of
 * the string by cutting of a specified amount
 * of leading and trailing characters.
 *
 * @param str - The string to be used
 * @param charCount - The amount of character to be cut off on each end
 */
export declare function strFixedTrim(str: string, charCount: number): string;
/**
 * Splits the string a fixed number of times
 * and puts the rest into the array.
 *
 * @param str - The string to be used
 * @param splitCount - The amount of splits
 */
export declare function strSplitWithTail(str: string, delimiter: string, splitCount: number): string[];
/**
 * Splits the string at the first occurence of
 * the delimiter and returns a two-element
 * array containing the first part and the rest
 * of the string.
 *
 * @param str - The string to be used
 * @param delimiter - The delimiter around which the string will be split
 */
export declare function strSplitOnce(str: string, delimiter: string): string[];
/**
 * Checks whether a string starts with a string
 * and ends with another string.
 *
 * @param str - The string to be tested
 * @param prefix - The start of a matching string
 * @param postfix - The end of a matching string
 */
export declare function strSurroundedBy(str: string, prefix: string, postfix: string): boolean;
/**
 * Uses stack parsing with nested brackets to determine whether
 * there provided brackets actually enclose the
 * entire content.
 *
 * @param str - The string to be tested
 * @param openingBracket - The opening bracket character
 * @param closingBracket - The closing bracket character
 */
export declare function strSurroundedByBrackets(str: string, openingBracket: string, closingBracket: string): boolean;
/**
 * Checks whether a string contains another string.
 * Mainly used to improve readability.
 *
 * @param str - The string to be tested
 * @param substring - A subsequence of a matching string
 */
export declare function strContains(str: string, substring: string): boolean;
export declare function strSplitAt(str: string, index: number): string[];