Function readFileRange

packages/agent-core/src/services/fs/fsService.ts:597–612

(
  absPath: string,
  start: number,
  end: number,
)

}

async function readFileRange(
  absPath: string,
  start: number,
  end: number,
): Promise<Buffer> {
  if (end <= start) return Buffer.alloc(0);
  const fh = await fs.open(absPath, 'r');
  try {
    const length = end - start;
    const buf = Buffer.allocUnsafe(length);
    const { bytesRead } = await fh.read(buf, 0, length, start);
    return bytesRead === length ? buf : buf.subarray(0, bytesRead);
  } finally {
    await fh.close();
  }
}

const EXT_TO_MIME: Readonly<Record<string, string>> = {
  '.ts': 'text/typescript',