Revert "deps: upgrade npm to 5.8.0"

This reverts commit 25a816dcda7b1db0929501acfe13f2fe5119759b.

PR-URL: https://github.com/nodejs/node/pull/19837
Reviewed-By: Gus Caplan <me@gus.host>

1 files changed, 24 insertions, 0 deletions

diff --git a/deps/npm/node_modules/pacote/lib/util/gunzip-maybe.js b/deps/npm/node_modules/pacote/lib/util/gunzip-maybe.js
new file mode 100644
index 0000000000..055de2921a
--- /dev/null
+++ b/deps/npm/node_modules/pacote/lib/util/gunzip-maybe.js
@@ -0,0 +1,24 @@
+'use strict'
+
+const duplex = require('mississippi').duplex
+const through = require('mississippi').through
+const zlib = require('zlib')
+
+function hasGzipHeader (c) {
+  return c[0] === 0x1F && c[1] === 0x8B && c[2] === 0x08
+}
+
+module.exports = gunzip
+function gunzip () {
+  const stream = duplex()
+  const peeker = through((chunk, enc, cb) => {
+    const newStream = hasGzipHeader(chunk)
+    ? zlib.createGunzip()
+    : through()
+    stream.setReadable(newStream)
+    stream.setWritable(newStream)
+    stream.write(chunk)
+  })
+  stream.setWritable(peeker)
+  return stream
+}