Function writeFileHandle

lib/internal/fs/promises.js:1129–1162

(filehandle, data, signal, encoding)

}

async function writeFileHandle(filehandle, data, signal, encoding) {
  checkAborted(signal);
  if (isCustomIterable(data)) {
    for await (const buf of data) {
      checkAborted(signal);
      const toWrite =
        isArrayBufferView(buf) ? buf : Buffer.from(buf, encoding || 'utf8');
      let remaining = toWrite.byteLength;
      while (remaining > 0) {
        const writeSize = MathMin(kWriteFileMaxChunkSize, remaining);
        const { bytesWritten } = await write(
          filehandle, toWrite, toWrite.byteLength - remaining, writeSize);
        remaining -= bytesWritten;
        checkAborted(signal);
      }
    }
    return;
  }
  data = new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
  let remaining = data.byteLength;
  if (remaining === 0) return;
  do {
    checkAborted(signal);
    const { bytesWritten } =
      await write(filehandle, data, 0,
                  MathMin(kWriteFileMaxChunkSize, data.byteLength));
    remaining -= bytesWritten;
    data = new Uint8Array(
      data.buffer,
      data.byteOffset + bytesWritten,
      data.byteLength - bytesWritten,
    );
  } while (remaining > 0);
}

async function readFileHandleWithUserBuffer(filehandle, options, size) {
  const signal = options?.signal;