Index: node_modules/tar/lib/high-level-opt.js
===================================================================
--- node_modules/tar/lib/high-level-opt.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/tar/lib/high-level-opt.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,29 @@
+'use strict'
+
+// turn tar(1) style args like `C` into the more verbose things like `cwd`
+
+const argmap = new Map([
+  ['C', 'cwd'],
+  ['f', 'file'],
+  ['z', 'gzip'],
+  ['P', 'preservePaths'],
+  ['U', 'unlink'],
+  ['strip-components', 'strip'],
+  ['stripComponents', 'strip'],
+  ['keep-newer', 'newer'],
+  ['keepNewer', 'newer'],
+  ['keep-newer-files', 'newer'],
+  ['keepNewerFiles', 'newer'],
+  ['k', 'keep'],
+  ['keep-existing', 'keep'],
+  ['keepExisting', 'keep'],
+  ['m', 'noMtime'],
+  ['no-mtime', 'noMtime'],
+  ['p', 'preserveOwner'],
+  ['L', 'follow'],
+  ['h', 'follow'],
+])
+
+module.exports = opt => opt ? Object.keys(opt).map(k => [
+  argmap.has(k) ? argmap.get(k) : k, opt[k],
+]).reduce((set, kv) => (set[kv[0]] = kv[1], set), Object.create(null)) : {}