/**
 * String Builder Utility
 * Efficient string concatenation for large text operations
 * Backward compatible performance optimization
 */
/**
 * High-performance string builder for concatenation operations
 */
export declare class StringBuilder {
    private chunks;
    /**
     * Append text to the builder
     * @param text - Text to append
     * @returns This builder instance for chaining
     */
    append(text: string): this;
    /**
     * Append text with a newline
     * @param text - Text to append (optional)
     * @returns This builder instance for chaining
     */
    appendLine(text?: string): this;
    /**
     * Append multiple strings efficiently
     * @param texts - Array of strings to append
     * @returns This builder instance for chaining
     */
    appendMany(texts: string[]): this;
    /**
     * Insert text at a specific position
     * @param index - Position to insert at
     * @param text - Text to insert
     * @returns This builder instance for chaining
     */
    insert(index: number, text: string): this;
    /**
     * Remove characters from a range
     * @param start - Start position
     * @param length - Length to remove
     * @returns This builder instance for chaining
     */
    remove(start: number, length: number): this;
    /**
     * Get the current length of the built string
     * @returns Current length
     */
    getLength(): number;
    /**
     * Check if the builder is empty
     * @returns True if no content has been added
     */
    isEmpty(): boolean;
    /**
     * Clear all content from the builder
     * @returns This builder instance for chaining
     */
    clear(): this;
    /**
     * Build and return the final string
     * @returns The concatenated string
     */
    toString(): string;
    /**
     * Build and return the final string, then clear the builder
     * @returns The concatenated string
     */
    buildAndClear(): string;
    /**
     * Get the number of chunks
     * @returns Number of chunks
     */
    getChunkCount(): number;
    /**
     * Repeat a string multiple times efficiently
     * @param text - Text to repeat
     * @param count - Number of times to repeat
     * @returns This builder instance for chaining
     */
    repeat(text: string, count: number): this;
    /**
     * Pad the string with characters
     * @param char - Character to pad with
     * @param length - Target length
     * @param align - Alignment ('left', 'right', 'center')
     * @returns This builder instance for chaining
     */
    pad(char: string, length: number, align?: 'left' | 'right' | 'center'): this;
}
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