How can I send byte array from unity to JavaScript?

This is my byte array on Unity side.

byte[] array1 = new byte[(int)size1];

I want to send it to .jslib like this:

[DllImport("__Internal")]private static extern void LoadJavaScriptFile(byte[] array,int size);

but I don't know how to handle this byte array using JavaScript. After:

const buffer = new ArrayBuffer(arraySize);const newByteArray = new Uint8Array(buffer);

what should I do?