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node_modules/@npmcli/fs/lib/mkdtemp.js

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+const { dirname, sep } = require('path')
+
+const fs = require('./fs.js')
+const getOptions = require('./common/get-options.js')
+const owner = require('./common/owner.js')
+
+const mkdtemp = async (prefix, opts) => {
+  const options = getOptions(opts, {
+    copy: ['encoding', 'owner'],
+    wrap: 'encoding',
+  })
+
+  // mkdtemp relies on the trailing path separator to indicate if it should
+  // create a directory inside of the prefix. if that's the case then the root
+  // we infer ownership from is the prefix itself, otherwise it's the dirname
+  // /tmp -> /tmpABCDEF, infers from /
+  // /tmp/ -> /tmp/ABCDEF, infers from /tmp
+  const root = prefix.endsWith(sep) ? prefix : dirname(prefix)
+  const { uid, gid } = await owner.validate(root, options.owner)
+
+  const result = await fs.mkdtemp(prefix, options)
+
+  await owner.update(result, uid, gid)
+
+  return result
+}
+
+module.exports = mkdtemp