Create ZIP_HEADER_LEN constant

Author: JamieMagee

src/parse.ts

@@ -33,6 +33,7 @@ import {
 const maxMetaEntrySize = 1024 * 1024
 const gzipHeader = Buffer.from([0x1f, 0x8b])
 const zstdHeader = Buffer.from([0x28, 0xb5, 0x2f, 0xfd])
+const ZIP_HEADER_LEN = Math.max(gzipHeader.length, zstdHeader.length)
 
 const STATE = Symbol('state')
 const WRITEENTRY = Symbol('writeEntry')
@@ -452,7 +453,7 @@ export class Parser extends EE implements Warner {
         chunk = Buffer.concat([this[BUFFER], chunk])
         this[BUFFER] = undefined
       }
-      if (chunk.length < Math.max(gzipHeader.length, zstdHeader.length)) {
+      if (chunk.length < ZIP_HEADER_LEN) {
         this[BUFFER] = chunk
         /* c8 ignore next */
         cb?.()