export declare class StringChain {
    private value;
    /**
     * Create a new chain wrapper for the provided input.
     * @param input The string to wrap for chained operations.
     */
    constructor(input: string);
    /**
     * Trim leading and trailing whitespace from the current value.
     * @returns The same chain instance for further chaining.
     */
    trim(): this;
    /**
     * Convert the current value to uppercase using default locale rules.
     * @returns The same chain instance for further chaining.
     */
    toUpper(): this;
    /**
     * Convert the current value to lowercase using default locale rules.
     * @returns The same chain instance for further chaining.
     */
    toLower(): this;
    /**
     * Replace a match in the current value using a string or RegExp search.
     * @param search The string or RegExp pattern to search for.
     * @param replacement The replacement string (supports RegExp replacement tokens).
     * @returns The same chain instance for further chaining.
     */
    replace(search: string | RegExp, replacement: string): this;
    /**
     * Reverse the current value by Unicode code points.
     * @returns The same chain instance for further chaining.
     */
    reverse(): this;
    /**
     * Get the current value as a string.
     * @returns The current chained value.
     */
    valueOf(): string;
    /**
     * Convert the chain to a string for coercion or display.
     * @returns The current chained value.
     */
    toString(): string;
}
/**
 * Create a new `StringChain` instance for the provided input.
 * @param input The string to wrap for chained operations.
 * @returns A new `StringChain` instance.
 */
export declare function chain(input: string): StringChain;
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