Add Promise support

scottcorgan · Sep 27, 2017 · e1be664 · e1be664
1 parent 4cae403
commit e1be664
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Showing 2 changed files with 24 additions and 1 deletion.
diff --git a/index.js b/index.js
@@ -1,12 +1,23 @@
 const fs = require('fs')
 const path = require('path')
 
-function fileExists (filepath, options, done = function () {}) {
+function fileExists (filepath, options, done) {
   if (typeof options === 'function') {
     done = options
     options = {}
   }
 
+  if (!done) {
+    return new Promise(resolve => {
+      fs.stat(fullPath(filepath, options), (err, stats) => {
+        if (err) {
+          return resolve(err.code === 'ENOENT' ? false : err)
+        }
+        resolve(stats.isFile())
+      })
+    })
+  }
+
   fs.stat(fullPath(filepath, options), (err, stats) => {
     if (err) {
       return err.code === 'ENOENT'

diff --git a/test/index.js b/test/index.js
@@ -34,6 +34,18 @@ test('async', t => {
         t.notOk(exists, 'non-existing file doesn\'t exist')
         done()
       })
+    },
+    done => {
+      fileExists('promise-not.here').then(exists => {
+        t.notOk(exists, 'promise: non-existing file doesn\'t exist')
+        done()
+      })
+    },
+    done => {
+      fileExists('.tmp/index.html').then(exists => {
+        t.ok(exists, 'promise: existing file exists')
+        done()
+      })
     }
   ], err => {
     rmdir('.tmp', () => t.end())