Refactor createSymlink

lib/ensure/symlink.js

@@ -26,27 +26,21 @@ async function createSymlink (srcpath, dstpath, type = false) {
       if (areIdentical(srcStat, dstStat)) return
     }
 
-    return _createSymlink(srcpath, dstpath, type)
+    await _createSymlink(srcpath, dstpath, type)
   } catch {}
 }
 
-function _createSymlink (srcpath, dstpath, type, callback) {
-  symlinkPaths(srcpath, dstpath, (err, relative) => {
-    if (err) return callback(err)
-    srcpath = relative.toDst
-    symlinkType(relative.toCwd, type, (err, type) => {
-      if (err) return callback(err)
-      const dir = path.dirname(dstpath)
-      pathExists(dir, (err, dirExists) => {
-        if (err) return callback(err)
-        if (dirExists) return fs.symlink(srcpath, dstpath, type, callback)
-        mkdirs(dir, err => {
-          if (err) return callback(err)
-          fs.symlink(srcpath, dstpath, type, callback)
-        })
-      })
-    })
-  })
+async function _createSymlink (srcpath, dstpath, type) {
+  const relative = await symlinkPaths(srcpath, dstpath)
+  srcpath = relative.toDst
+  const toType = await symlinkType(relative.toCwd, type)
+  const dir = path.dirname(dstpath)
+
+  const dirExists = await pathExists(dir)
+  if (dirExists) return fs.symlink(srcpath, dstpath, toType)
+
+  await mkdirs(dir)
+  return fs.symlink(srcpath, dstpath, toType)
 }
 
 function createSymlinkSync (srcpath, dstpath, type) {