do not accept directories in fileTree

test/test.ts

@@ -164,8 +164,11 @@ tap.test('.Smartfile -> should produce vinyl compatible files', async () => {
   let localSmartfile = smartfileArray[ 0 ]
   expect(localSmartfile).to.be.instanceof(smartfile.Smartfile)
   expect(localSmartfile.contents).to.be.instanceof(Buffer)
+  // tslint:disable-next-line:no-unused-expression
   expect(localSmartfile.isBuffer()).to.be.true
+  // tslint:disable-next-line:no-unused-expression
   expect(localSmartfile.isDirectory()).to.be.false
+  // tslint:disable-next-line:no-unused-expression
   expect(localSmartfile.isNull()).to.be.false
 })
 

test/testfolder/subfolder/deepsubfolder/deepsubtestfile.txt

@@ -0,0 +1 @@
+okidoks

test/testfolder/subfolder/subtestfile.txt

@@ -0,0 +1 @@
+hi

ts/smartfile.fs.ts

@@ -375,7 +375,8 @@ export let listFileTree = (dirPathArg: string, miniMatchFilter: string): Promise
   }
 
   let options = {
-    cwd: dirPath
+    cwd: dirPath,
+    nodir: true
   }
   plugins.glob(miniMatchFilter, options, (err, files: string[]) => {
     if (err) {