diff --git a/browser-version/lib/byline.js b/browser-version/lib/byline.js
index 7c6d6c7..4ba52ba 100644
--- a/browser-version/lib/byline.js
+++ b/browser-version/lib/byline.js
@@ -1 +1 @@
-module.exports = {}
\ No newline at end of file
+module.exports = {}
diff --git a/lib/persistence.js b/lib/persistence.js
index 1e65bed..126c75a 100755
--- a/lib/persistence.js
+++ b/lib/persistence.js
@@ -198,8 +198,7 @@ class Persistence {
     const that = this
     let length = 0
 
-    lineStream.on('data', function(line) {
-
+    lineStream.on('data', function (line) {
       try {
         const doc = model.deserialize(that.beforeDeserialization(line))
         if (doc._id) {
@@ -214,11 +213,11 @@ class Persistence {
       length++
     })
 
-    lineStream.on('end', function() {
+    lineStream.on('end', function () {
       // A bit lenient on corruption
       let err
       if (length > 0 && corruptItems / length > that.corruptAlertThreshold) {
-        err = new Error("More than " + Math.floor(100 * that.corruptAlertThreshold) + "% of the data file is corrupt, the wrong beforeDeserialization hook may be used. Cautiously refusing to start NeDB to prevent dataloss")
+        err = new Error('More than ' + Math.floor(100 * that.corruptAlertThreshold) + '% of the data file is corrupt, the wrong beforeDeserialization hook may be used. Cautiously refusing to start NeDB to prevent dataloss')
       }
 
       Object.keys(dataById).forEach(function (k) {
@@ -228,7 +227,7 @@ class Persistence {
       cb(err, { data: tdata, indexes: indexes })
     })
 
-    lineStream.on('error', function(err) {
+    lineStream.on('error', function (err) {
       cb(err)
     })
   }
@@ -258,7 +257,6 @@ class Persistence {
           storage.ensureDatafileIntegrity(this.filename, err => {
             // TODO: handle error
             const treatedDataCallback = (err, treatedData) => {
-
               if (err) return cb(err)
 
               // Recreate all indexes in the datafile
@@ -279,7 +277,7 @@ class Persistence {
 
             if (storage.readFileStream) {
               // Server side
-              const fileStream = storage.readFileStream(this.filename, { encoding : 'utf8' })
+              const fileStream = storage.readFileStream(this.filename, { encoding: 'utf8' })
               this.treatRawStream(fileStream, treatedDataCallback)
               return
             }
diff --git a/test/persistence.test.js b/test/persistence.test.js
index df0dcda..ecbc4dd 100755
--- a/test/persistence.test.js
+++ b/test/persistence.test.js
@@ -102,7 +102,7 @@ describe('Persistence', function () {
 
     d.persistence.treatRawStream(stream, function (err, result) {
       console.log(err)
-      var treatedData = result.data
+      const treatedData = result.data
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)
       assert.deepStrictEqual(treatedData[0], { _id: '1', a: 2, ages: [1, 5, 12] })
@@ -135,7 +135,7 @@ describe('Persistence', function () {
     stream.push(null)
 
     d.persistence.treatRawStream(stream, function (err, result) {
-      var treatedData = result.data
+      const treatedData = result.data
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)
       assert.deepStrictEqual(treatedData[0], { _id: '1', a: 2, ages: [1, 5, 12] })
@@ -168,7 +168,7 @@ describe('Persistence', function () {
     stream.push(null)
 
     d.persistence.treatRawStream(stream, function (err, result) {
-      var treatedData = result.data
+      const treatedData = result.data
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)
       assert.deepStrictEqual(treatedData[0], { _id: '1', nested: { today: now } })
@@ -203,7 +203,7 @@ describe('Persistence', function () {
     stream.push(null)
 
     d.persistence.treatRawStream(stream, function (err, result) {
-      var treatedData = result.data
+      const treatedData = result.data
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)
       assert.deepStrictEqual(treatedData[0], { _id: '2', hello: 'world' })
@@ -236,7 +236,7 @@ describe('Persistence', function () {
     stream.push(null)
 
     d.persistence.treatRawStream(stream, function (err, result) {
-      var treatedData = result.data
+      const treatedData = result.data
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)
       assert.deepStrictEqual(treatedData[0], { _id: '1', a: 2, ages: [1, 5, 12] })
@@ -273,10 +273,10 @@ describe('Persistence', function () {
     stream.push(null)
 
     d.persistence.treatRawStream(stream, function (err, result) {
-      var treatedData = result.data
-      var indexes = result.indexes
+      const treatedData = result.data
+      const indexes = result.indexes
       Object.keys(indexes).length.should.equal(1)
-      assert.deepEqual(indexes.test, { fieldName: "test", unique: true })
+      assert.deepEqual(indexes.test, { fieldName: 'test', unique: true })
 
       treatedData.sort(function (a, b) { return a._id - b._id })
       treatedData.length.should.equal(2)