diff --git a/index.js b/index.js
index 3eee8b7..5fc3b52 100755
--- a/index.js
+++ b/index.js
@@ -1,10 +1,10 @@
-var _     = require('lodash');
-var map   = require('map-stream');
-var pp    = require('preprocess');
-var path  = require('path');
+var _ = require("lodash");
+var map = require("map-stream");
+var pp = require("preprocess");
+var path = require("path");
 
-module.exports = function (options) {
-  var opts    = _.merge({}, options);
+module.exports = function(options) {
+  var opts = _.merge({}, options);
   var context = _.merge({}, process.env, opts.context);
 
   function ppStream(file, callback) {
@@ -12,15 +12,18 @@ module.exports = function (options) {
 
     // TODO: support streaming files
     if (file.isNull()) return callback(null, file); // pass along
-    if (file.isStream()) return callback(new Error("gulp-preprocess: Streaming not supported"));
+    if (file.isStream())
+      return callback(new Error("gulp-preprocess: Streaming not supported"));
 
     context.src = file.path;
     context.srcDir = opts.includeBase || path.dirname(file.path);
-    context.NODE_ENV = context.NODE_ENV || 'development';
+    context.NODE_ENV = context.NODE_ENV || "development";
 
-    extension = _.isEmpty(opts.extension) ? getExtension(context.src) : opts.extension;
+    extension = _.isEmpty(opts.extension)
+      ? getExtension(context.src)
+      : opts.extension;
 
-    contents = file.contents.toString('utf8');
+    contents = file.contents.toString("utf8");
     contents = pp.preprocess(contents, context, extension);
     file.contents = new Buffer(contents);
 
@@ -31,6 +34,6 @@ module.exports = function (options) {
 };
 
 function getExtension(filename) {
-  var ext = path.extname(filename||'').split('.');
+  var ext = path.extname(filename || "").split(".");
   return ext[ext.length - 1];
 }
diff --git a/package-lock.json b/package-lock.json
index c28b078..deac846 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -524,6 +524,12 @@
         "xregexp": "3.1.0"
       }
     },
+    "prettier": {
+      "version": "1.13.5",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-1.13.5.tgz",
+      "integrity": "sha512-4M90mfvLz6yRf2Dhzd+xPIE6b4xkI8nHMJhsSm9IlfG17g6wujrrm7+H1X8x52tC4cSNm6HmuhCUSNe6Hd5wfw==",
+      "dev": true
+    },
     "process-nextick-args": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
diff --git a/package.json b/package.json
index af3e39b..71775c3 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,7 @@
   "devDependencies": {
     "gulp-util": "3.0.x",
     "mocha": "*",
+    "prettier": "^1.13.5",
     "should": "*"
   },
   "engines": {
diff --git a/test/main.js b/test/main.js
index 794d1bb..02c709f 100755
--- a/test/main.js
+++ b/test/main.js
@@ -1,140 +1,144 @@
-var should = require('should');
-var gutil = require('gulp-util');
-var preprocess = require('../');
-var fs = require('fs');
+var should = require("should");
+var gutil = require("gulp-util");
+var preprocess = require("../");
+var fs = require("fs");
 
-require('mocha');
+require("mocha");
 
 function fixtureFile(fileName) {
   return new gutil.File({
-    base: 'test/fixtures',
-    cwd: 'test/',
-    path: 'test/fixtures/' + fileName,
-    contents: fs.readFileSync('test/fixtures/' + fileName)
+    base: "test/fixtures",
+    cwd: "test/",
+    path: "test/fixtures/" + fileName,
+    contents: fs.readFileSync("test/fixtures/" + fileName)
   });
-};
+}
 
-process.env['FAKEHOME'] = '/Users/jas';
+process.env["FAKEHOME"] = "/Users/jas";
 
-describe('gulp-preprocess', function(){
-  describe('preprocess()', function(){
-
-    it('should preprocess html', function(done){
+describe("gulp-preprocess", function() {
+  describe("preprocess()", function() {
+    it("should preprocess html", function(done) {
       var stream = preprocess({
         context: {
-          firstOption: 'bar',
-          secondOption: 'foo'
+          firstOption: "bar",
+          secondOption: "foo"
         }
       });
 
-      var fakeFile = fixtureFile('test.html');
+      var fakeFile = fixtureFile("test.html");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test.html', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test.html", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
 
-    it('should preprocess javascript', function(done){
+    it("should preprocess javascript", function(done) {
       var stream = preprocess({
         context: {
-          firstOption: 'bar',
-          secondOption: 'foo'
+          firstOption: "bar",
+          secondOption: "foo"
         }
       });
 
-      var fakeFile = fixtureFile('test.js');
+      var fakeFile = fixtureFile("test.js");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test.js', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test.js", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
 
-    it('should preprocess coffeescript', function(done){
+    it("should preprocess coffeescript", function(done) {
       var stream = preprocess({
         context: {
-          firstOption: 'bar',
-          secondOption: 'foo'
+          firstOption: "bar",
+          secondOption: "foo"
         }
       });
 
-      var fakeFile = fixtureFile('test.coffee');
+      var fakeFile = fixtureFile("test.coffee");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test.coffee', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test.coffee", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
 
-    it('should preprocess without options object', function(done){
+    it("should preprocess without options object", function(done) {
       var stream = preprocess();
 
-      var fakeFile = fixtureFile('test.coffee');
+      var fakeFile = fixtureFile("test.coffee");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test.coffee', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test.coffee", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
 
-    it('should preprocess html with custom base', function(done){
+    it("should preprocess html with custom base", function(done) {
       var stream = preprocess({
-        includeBase: 'test/fixtures/base',
+        includeBase: "test/fixtures/base",
         context: {
-          firstOption: 'bar',
-          secondOption: 'foo'
+          firstOption: "bar",
+          secondOption: "foo"
         }
       });
 
-      var fakeFile = fixtureFile('test.html');
+      var fakeFile = fixtureFile("test.html");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test-base.html', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test-base.html", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
 
-    it('should allow custom extension', function(done){
+    it("should allow custom extension", function(done) {
       var stream = preprocess({
-        extension: 'html',
+        extension: "html",
         context: {
-          firstOption: 'bar',
-          secondOption: 'foo'
+          firstOption: "bar",
+          secondOption: "foo"
         }
       });
 
-      var fakeFile = fixtureFile('test.php');
+      var fakeFile = fixtureFile("test.php");
 
-      stream.once('data', function(newFile){
+      stream.once("data", function(newFile) {
         should.exist(newFile);
         should.exist(newFile.contents);
-        String(newFile.contents).should.equal(fs.readFileSync('test/expected/test.html', 'utf8'));
+        String(newFile.contents).should.equal(
+          fs.readFileSync("test/expected/test.html", "utf8")
+        );
         done();
       });
       stream.write(fakeFile);
-
     });
-
   });
 });