convert to typescript

src/encoders/packet-header-chunk.ts

@@ -0,0 +1,21 @@
+import chunk from './chunk';
+
+export default (
+  timestamp: bigint,
+  versionHigh: number,
+  versionLow: number,
+  frameId: number,
+  framePacketCount: number
+): Buffer => {
+  if (frameId > 255) {
+    throw new Error('frame id must be >= 0 and <= 255');
+  }
+  const packetHeader = Buffer.alloc(12);
+  packetHeader.writeBigUInt64LE(BigInt(timestamp));
+  packetHeader.writeUint8(versionHigh, 8);
+  packetHeader.writeUint8(versionLow, 9);
+  packetHeader.writeUint8(frameId, 10);
+  packetHeader.writeUint8(framePacketCount, 11);
+
+  return chunk(0x0000, packetHeader, false);
+};