Function sampleFileLines

frontend/src/lib/streamReader.ts:224–244

(
    file: File,
    options: {
      maxLines?: number;
      skipFirst?: boolean;
      onProgress?: (progress: number) => void;
    } = {}
  )

   * This is useful for CSV/JSON files to detect headers and data formats
   */
  export async function sampleFileLines(
    file: File,
    options: {
      maxLines?: number;
      skipFirst?: boolean;
      onProgress?: (progress: number) => void;
    } = {}
  ): Promise<string[]> {
    const { maxLines = 100, skipFirst = false, onProgress } = options;
    const reader = createFileStreamReader(file, { onProgress });
    const lines: string[] = [];
    
    await reader.readLines(
      (line) => {
        lines.push(line);
      },
      { skipFirst, maxLines }
    );
    
    return lines;
  }