diff --git a/package.json b/package.json
index 2d91f63e..93e81d74 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "private": false,
   "devDependencies": {
     "eslint": "^4.19.1",
+    "eslint-config-prettier": "^2.9.0",
     "husky": "^0.14.3",
     "jest": "^22.4.3",
     "lint-staged": "^7.1.0",
@@ -16,7 +17,9 @@
     "puppeteer": "^1.3.0"
   },
   "scripts": {
-    "lint": "eslint",
+    "prettier:write":
+      "prettier --single-quote --trailing-comma es5 --write src/**/*",
+    "lint": "eslint src",
     "test": "jest",
     "precommit": "lint-staged"
   },
diff --git a/src/__tests__/index.test.js b/src/__tests__/index.test.js
index 79653062..f879a07c 100644
--- a/src/__tests__/index.test.js
+++ b/src/__tests__/index.test.js
@@ -1,9 +1,9 @@
-const PendingXHR = require('../index').PendingXHR;
-const http = require('http');
-const puppeteer = require('puppeteer');
+const PendingXHR = require("../index").PendingXHR;
+const http = require("http");
+const puppeteer = require("puppeteer");
 const port = 8907;
 const xhrBackendPort = 8908;
-const util = require('util');
+const util = require("util");
 // const sleep = util.promisify(setTimeout);
 
 function timeout(ms) {
@@ -14,7 +14,6 @@ async function sleep(delay) {
   return;
 }
 
-
 const OK_NO_XHR = `
 <html>
 OK_NO_XHR
@@ -66,13 +65,13 @@ setTimeout(() => {
 `;
 
 const requestHandler = (request, response) => {
-  if (request.url === '/with_infinite_xhr') {
+  if (request.url === "/with_infinite_xhr") {
     response.statusCode = 200;
     response.end(OK_WITH_1_SLOW_XHR);
-  } else if (request.url === '/with_xhr') {
+  } else if (request.url === "/with_xhr") {
     response.statusCode = 200;
     response.end(OK_WITH_1_XHR);
-  } else if (request.url === '/with_xhr_failing') {
+  } else if (request.url === "/with_xhr_failing") {
     response.statusCode = 200;
     response.end(OK_WITH_1_XHR);
   } else {
@@ -82,15 +81,15 @@ const requestHandler = (request, response) => {
 };
 
 const backendRequestHandler = (request, response) => {
-  if (request.url === '/infinite') {
+  if (request.url === "/infinite") {
     // This xhr will never end
-  } else if (request.url === '/fail') {
+  } else if (request.url === "/fail") {
     response.statusCode = 500;
-    response.end('boom');
+    response.end("boom");
   } else {
     response.end();
   }
-}
+};
 
 let server;
 let backendServer;
@@ -115,17 +114,16 @@ afterEach(async () => {
   await backendServer.close();
 });
 
-describe('PendingXHR', () => {
-
-  describe('pendingXhrCount', () => {
-    it('returns 0 if no xhr pending count', async () => {
+describe("PendingXHR", () => {
+  describe("pendingXhrCount", () => {
+    it("returns 0 if no xhr pending count", async () => {
       const page = await browser.newPage();
       const pendingXHR = new PendingXHR(page);
       await page.goto(`http://localhost:${port}/no_xhr`);
       expect(pendingXHR.pendingXhrCount()).toEqual(0);
     });
 
-    it('returns the xhr pending count', async () => {
+    it("returns the xhr pending count", async () => {
       const page = await browser.newPage();
       const pendingXHR = new PendingXHR(page);
       await page.goto(`http://localhost:${port}/with_infinite_xhr`);
@@ -134,15 +132,15 @@ describe('PendingXHR', () => {
     });
   });
 
-  describe('waitForAllXhrFinished', async () => {
-    it('returns immediatly if no xhr pending count', async () => {
+  describe("waitForAllXhrFinished", async () => {
+    it("returns immediatly if no xhr pending count", async () => {
       const page = await browser.newPage();
       const pendingXHR = new PendingXHR(page);
       await page.goto(`http://localhost:${port}/no_xhr`);
       await pendingXHR.waitForAllXhrFinished();
     });
 
-    it('waits for all xhr to end', async () => {
+    it("waits for all xhr to end", async () => {
       const page = await browser.newPage();
       const pendingXHR = new PendingXHR(page);
       await page.goto(`http://localhost:${port}/with_xhr`);
@@ -151,7 +149,7 @@ describe('PendingXHR', () => {
       expect(pendingXHR.pendingXhrCount()).toEqual(0);
     });
 
-    it('handle correctly failed xhr', async () => {
+    it("handle correctly failed xhr", async () => {
       const page = await browser.newPage();
       const pendingXHR = new PendingXHR(page);
       await page.goto(`http://localhost:${port}/with_xhr_failing`);
@@ -160,4 +158,4 @@ describe('PendingXHR', () => {
       expect(pendingXHR.pendingXhrCount()).toEqual(0);
     });
   });
-});
\ No newline at end of file
+});
diff --git a/src/index.js b/src/index.js
index 21cfed3e..143a080f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,44 +1,55 @@
 class PendingXHR {
-
   constructor(page) {
     this.page = page;
-    this.resourceType = 'xhr';
+    this.resourceType = "xhr";
     // page.setRequestInterception(true);
     this.pendingXhrs = new Set();
     this.finishedWithSuccessXhrs = new Set();
     this.finishedWithErrorsXhrs = new Set();
-    page.on('request', request => {
-      console.log(Date.now(), 'new request', request.resourceType(), ' to ', request.url());
+    page.on("request", request => {
+      console.log(
+        Date.now(),
+        "new request",
+        request.resourceType(),
+        " to ",
+        request.url()
+      );
       if (request.resourceType() === this.resourceType) {
         this.pendingXhrs.add(request);
-        if(!this.promise) {
+        if (!this.promise) {
           this.promise = new Promise((resolve, reject) => {
             this.resolver = resolve;
           });
           this.promise.then(() => {
-            console.log('All xhr are ended');
+            console.log("All xhr are ended");
           });
-        }       
+        }
       }
     });
-    page.on('requestfailed', request => {
+    page.on("requestfailed", request => {
       if (request.resourceType() === this.resourceType) {
         console.log(this.pendingXhrs);
         this.pendingXhrs.delete(request);
         this.finishedWithErrorsXhrs.add(request);
-        if(this.resolver) {
+        if (this.resolver) {
           this.resolver();
           delete this.promise;
           delete this.resolver;
         }
       }
     });
-    page.on('requestfinished', request => {
-      console.log(Date.now(), 'request finished', request.resourceType(), ' to ', request.url());
+    page.on("requestfinished", request => {
+      console.log(
+        Date.now(),
+        "request finished",
+        request.resourceType(),
+        " to ",
+        request.url()
+      );
       if (request.resourceType() === this.resourceType) {
         this.pendingXhrs.delete(request);
         this.finishedWithSuccessXhrs.add(request);
-        if(this.resolver) {
+        if (this.resolver) {
           this.resolver();
           delete this.promise;
           delete this.resolver;
@@ -51,8 +62,8 @@ class PendingXHR {
     if (this.pendingXhrCount() === 0) {
       return true;
     }
-    if(this.promise) {
-      console.log('promise exists', this.promise);
+    if (this.promise) {
+      console.log("promise exists", this.promise);
       await this.promise;
     }
   }