Function assertPngBuffer

scripts/integration/cli.mjs:2027–2032

(buffer)

}

function assertPngBuffer(buffer) {
  const pngSignature = "89504e470d0a1a0a";
  if (buffer.subarray(0, 8).toString("hex") !== pngSignature) {
    throw new Error("Expected PNG data.");
  }
}

function assertMp4Buffer(buffer) {
  if (