node_modules/tar/lib/normalize-unicode.js

// warning: extremely hot code path.
// This has been meticulously optimized for use
// within npm install on large package trees.
// Do not edit without careful benchmarking.
const normalizeCache = Object.create(null)
const {hasOwnProperty} = Object.prototype
module.exports = s => {
  if (!hasOwnProperty.call(normalizeCache, s))
    normalizeCache[s] = s.normalize('NFKD')
  return normalizeCache[s]
}