Remove fs-extra dependency

server/libs/universalify/index.js

@@ -0,0 +1,24 @@
+'use strict'
+
+exports.fromCallback = function (fn) {
+  return Object.defineProperty(function (...args) {
+    if (typeof args[args.length - 1] === 'function') fn.apply(this, args)
+    else {
+      return new Promise((resolve, reject) => {
+        fn.call(
+          this,
+          ...args,
+          (err, res) => (err != null) ? reject(err) : resolve(res)
+        )
+      })
+    }
+  }, 'name', { value: fn.name })
+}
+
+exports.fromPromise = function (fn) {
+  return Object.defineProperty(function (...args) {
+    const cb = args[args.length - 1]
+    if (typeof cb !== 'function') return fn.apply(this, args)
+    else fn.apply(this, args.slice(0, -1)).then(r => cb(null, r), cb)
+  }, 'name', { value: fn.name })
+}