reuse fixed size DataViews

src/encoders/chunk.ts

@@ -1,3 +1,4 @@
+const header = new DataView(new ArrayBuffer(4));
 export default (id: number, chunkData: Uint8Array, hasSubchunks: boolean): Uint8Array => {
   if (!Number.isInteger(id)) {
     throw new Error('chunk id must be an integer');
@@ -11,7 +12,6 @@ export default (id: number, chunkData: Uint8Array, hasSubchunks: boolean): Uint8
     throw new Error('chunkData can not be greater than 32767 bytes');
   }
 
-  const header = new DataView(new ArrayBuffer(4));
   header.setUint16(0, id, true);
   const hasSubChunksBit = (hasSubchunks ? 1 : 0) << 15;
   header.setUint16(2, hasSubChunksBit + chunkData.length, true);

src/encoders/data/data-tracker-timestamp-chunk.ts

@@ -1,7 +1,7 @@
 import chunk from '../chunk';
 
+const buf = new DataView(new ArrayBuffer(8));
 export default (timestamp: bigint): Uint8Array => {
-  const buf = new DataView(new ArrayBuffer(8));
   buf.setBigUint64(0, BigInt(timestamp), true);
   return chunk(0x0006, new Uint8Array(buf.buffer), false);
 };

src/encoders/packet-header-chunk.ts

@@ -1,5 +1,6 @@
 import chunk from './chunk';
 
+const packetHeader = new DataView(new ArrayBuffer(12));
 export default (
   timestamp: bigint,
   versionHigh: number,
@@ -33,7 +34,6 @@ export default (
     throw new Error('frame packet count must be >= 0 and <= 255');
   }
 
-  const packetHeader = new DataView(new ArrayBuffer(12));
   packetHeader.setBigUint64(0, BigInt(timestamp), true);
   packetHeader.setUint8(8, versionHigh);
   packetHeader.setUint8(9, versionLow);