Refactor outputFile API to async/await (#1024)

lib/output-file/index.js

@@ -1,36 +1,27 @@
 'use strict'
 
-const u = require('universalify').fromCallback
-const fs = require('graceful-fs')
+const u = require('universalify').fromPromise
+const fs = require('../fs')
 const path = require('path')
 const mkdir = require('../mkdirs')
 const pathExists = require('../path-exists').pathExists
 
-function outputFile (file, data, encoding, callback) {
-  if (typeof encoding === 'function') {
-    callback = encoding
-    encoding = 'utf8'
-  }
-
+async function outputFile (file, data, encoding = 'utf-8') {
   const dir = path.dirname(file)
-  pathExists(dir, (err, itDoes) => {
-    if (err) return callback(err)
-    if (itDoes) return fs.writeFile(file, data, encoding, callback)
 
-    mkdir.mkdirs(dir, err => {
-      if (err) return callback(err)
+  if (!(await pathExists(dir))) {
+    await mkdir.mkdirs(dir)
+  }
 
-      fs.writeFile(file, data, encoding, callback)
-    })
-  })
+  return fs.writeFile(file, data, encoding)
 }
 
 function outputFileSync (file, ...args) {
   const dir = path.dirname(file)
-  if (fs.existsSync(dir)) {
-    return fs.writeFileSync(file, ...args)
+  if (!fs.existsSync(dir)) {
+    mkdir.mkdirsSync(dir)
   }
-  mkdir.mkdirsSync(dir)
+
   fs.writeFileSync(file, ...args)
 }