/**
 * Splits a string into an array of fixed-size chunks.
 *
 * @param input - The string to split.
 * @param size - The chunk size in code units; must be a positive, finite number.
 * @returns An array of chunk strings.
 *
 * Special behavior: Throws when size is non-positive or non-finite.
 */
export declare function chunkString(input: string, size: number): string[];
/**
 * Applies a transformer to each chunk and concatenates the results.
 *
 * @param chunks - The list of chunks to transform.
 * @param transformer - The function applied to each chunk.
 * @returns The concatenated transformed result.
 *
 * Special behavior: Preserves chunk order and performs a simple left-to-right join.
 */
export declare function streamTransform(chunks: string[], transformer: (chunk: string) => string): string;
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