Read the incoming data from stdin into an array buffer (p).

Resolves to either the number of bytes read during the operation or EOF (null) if there was nothing more to read.

It is possible for a read to successfully return with 0 bytes. This does not indicate EOF.

It is not guaranteed that the full buffer will be read in a single call.

// If the text "hello world" is piped into the script:
const buf = new Uint8Array(100);
const numberOfBytesRead = await Deno.stdin.read(buf); // 11 bytes
const text = new TextDecoder().decode(buf);  // "hello world"