deps: upgrade npm to 5.8.0

PR-URL: https://github.com/nodejs/node/pull/19560
Fixes: https://github.com/nodejs/node/issues/19271
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/deps/npm/node_modules/cacache/node_modules/mississippi/node_modules/through2/node_modules/xtend/mutable.js b/deps/npm/node_modules/cacache/node_modules/mississippi/node_modules/through2/node_modules/xtend/mutable.js
new file mode 100644
index 0000000000..72debede6c
--- /dev/null
+++ b/deps/npm/node_modules/cacache/node_modules/mississippi/node_modules/through2/node_modules/xtend/mutable.js
@@ -0,0 +1,17 @@
+module.exports = extend
+
+var hasOwnProperty = Object.prototype.hasOwnProperty;
+
+function extend(target) {
+    for (var i = 1; i < arguments.length; i++) {
+        var source = arguments[i]
+
+        for (var key in source) {
+            if (hasOwnProperty.call(source, key)) {
+                target[key] = source[key]
+            }
+        }
+    }
+
+    return target
+}