export declare class LazyString {
    private input;
    private operations;
    /**
     * Create a new lazy wrapper for the provided input.
     * @param input The string to wrap for lazy operations.
     */
    constructor(input: string);
    /**
     * Register a transformation to run later during execution.
     * @param fn A function that receives the current value and returns the next value.
     * @returns The same lazy instance for further chaining.
     */
    map(fn: (input: string) => string): this;
    /**
     * Register a trim operation that removes surrounding whitespace.
     * @returns The same lazy instance for further chaining.
     */
    trim(): this;
    /**
     * Register an uppercase conversion using default locale rules.
     * @returns The same lazy instance for further chaining.
     */
    toUpper(): this;
    /**
     * Register a lowercase conversion using default locale rules.
     * @returns The same lazy instance for further chaining.
     */
    toLower(): this;
    /**
     * Execute all registered operations in order and return the result.
     * @returns The final transformed string.
     */
    execute(): string;
}
/**
 * Create a new `LazyString` instance for the provided input.
 * @param input The string to wrap for lazy operations.
 * @returns A new `LazyString` instance.
 */
export declare function lazy(input: string): LazyString;
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