diff --git a/.github/PULL_REQUEST_TEMPLATE b/.github/PULL_REQUEST_TEMPLATE
index cef8ed2af..b03e3e8e3 100644
--- a/.github/PULL_REQUEST_TEMPLATE
+++ b/.github/PULL_REQUEST_TEMPLATE
@@ -1,5 +1,5 @@
 Thank you for making a pull request ! Just a gentle reminder :)
 
 1. If the PR is offering a feature please make the request to our "Feature Branch" 0.11.0
-2. Bug fix request to "Bug Fix Branch" 0.10.8
+2. Bug fix request to "Bug Fix Branch" 0.10.9
 3. Correct README.md can directly to master
diff --git a/android.js b/android.js
index 0b5dbd84b..80c4e4a96 100644
--- a/android.js
+++ b/android.js
@@ -13,7 +13,7 @@ const RNFetchBlob:RNFetchBlobNative = NativeModules.RNFetchBlob
 
 /**
  * Send an intent to open the file.
- * @param  {string]} path Path of the file to be open.
+ * @param  {string} path Path of the file to be open.
  * @param  {string} mime MIME type string
  * @return {Promise}
  */
diff --git a/android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java b/android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java
index 7a7910546..f4531bb5b 100644
--- a/android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java
+++ b/android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java
@@ -78,7 +78,7 @@ static public void writeFile(String path, String encoding, String data, final bo
                 data = normalizePath(data);
                 File src = new File(data);
                 if(!src.exists()) {
-                    promise.reject("RNfetchBlob writeFileError", "source file : " + data + "not exists");
+                    promise.reject("RNfetchBlob writeFile error", "source file : " + data + " does not exist");
                     fout.close();
                     return ;
                 }
@@ -100,7 +100,7 @@ static public void writeFile(String path, String encoding, String data, final bo
             fout.close();
             promise.resolve(written);
         } catch (Exception e) {
-            promise.reject("RNFetchBlob writeFileError", e.getLocalizedMessage());
+            promise.reject("RNFetchBlob writeFile error", e.getLocalizedMessage());
         }
     }
 
@@ -127,7 +127,7 @@ static public void writeFile(String path, ReadableArray data, final boolean appe
             os.close();
             promise.resolve(data.size());
         } catch (Exception e) {
-            promise.reject("RNFetchBlob writeFileError", e.getLocalizedMessage());
+            promise.reject("RNFetchBlob writeFile error", e.getLocalizedMessage());
         }
     }
 
@@ -309,7 +309,8 @@ else if(resolved == null) {
             buffer = null;
 
         } catch (Exception err) {
-            emitStreamEvent(streamId, "warn", "Failed to convert data to "+encoding+" encoded string, this might due to the source data is not able to convert using this encoding.");
+            emitStreamEvent(streamId, "warn", "Failed to convert data to " + encoding +
+                    " encoded string, this might due to the source data is not able to convert using this encoding.");
             err.printStackTrace();
         }
     }
@@ -324,7 +325,7 @@ else if(resolved == null) {
     public void writeStream(String path, String encoding, boolean append, Callback callback) {
         File dest = new File(path);
         if(!dest.exists() || dest.isDirectory()) {
-            callback.invoke("write stream error: target path `" + path + "` may not exists or it's a folder");
+            callback.invoke("target path `" + path + "` may not exist or it is a folder");
             return;
         }
         try {
@@ -336,7 +337,7 @@ public void writeStream(String path, String encoding, boolean append, Callback c
             this.writeStreamInstance = fs;
             callback.invoke(null, streamId);
         } catch(Exception err) {
-            callback.invoke("write stream error: failed to create write stream at path `"+path+"` "+ err.getLocalizedMessage());
+            callback.invoke("failed to create write stream at path `" + path + "` " + err.getLocalizedMessage());
         }
 
     }
@@ -433,12 +434,13 @@ static void deleteRecursive(File fileOrDirectory) {
     static void mkdir(String path, Callback callback) {
         File dest = new File(path);
         if(dest.exists()) {
-            callback.invoke("mkdir error: failed to create folder at `" + path + "` folder already exists");
+            callback.invoke("mkdir failed, folder already exists at " + path);
             return;
         }
         dest.mkdirs();
         callback.invoke();
     }
+
     /**
      * Copy file to destination path
      * @param path Source path
@@ -454,7 +456,7 @@ static void cp(String path, String dest, Callback callback) {
         try {
 
             if(!isPathExists(path)) {
-                callback.invoke("cp error: source file at path`" + path + "` not exists");
+                callback.invoke("source file at path`" + path + "` does not exist");
                 return;
             }
             if(!new File(dest).exists())
@@ -495,7 +497,7 @@ static void cp(String path, String dest, Callback callback) {
     static void mv(String path, String dest, Callback callback) {
         File src = new File(path);
         if(!src.exists()) {
-            callback.invoke("mv error: source file at path `" + path + "` does not exists");
+            callback.invoke("source file at path `" + path + "` does not exist");
             return;
         }
         src.renameTo(new File(dest));
@@ -535,7 +537,7 @@ static void ls(String path, Callback callback) {
         path = normalizePath(path);
         File src = new File(path);
         if (!src.exists() || !src.isDirectory()) {
-            callback.invoke("ls error: failed to list path `" + path + "` for it is not exist or it is not a folder");
+            callback.invoke("failed to list path `" + path + "` for it is not exist or it is not a folder");
             return;
         }
         String[] files = new File(path).list();
@@ -559,7 +561,7 @@ public static void slice(String src, String dest, int start, int end, String enc
             src = normalizePath(src);
             File source = new File(src);
             if(!source.exists()) {
-                promise.reject("RNFetchBlob.slice error", "source file : " + src + " not exists");
+                promise.reject("RNFetchBlob slice error", "source file : " + src + " does not exist");
                 return;
             }
             long size = source.length();
@@ -585,7 +587,7 @@ public static void slice(String src, String dest, int start, int end, String enc
             promise.resolve(dest);
         } catch (Exception e) {
             e.printStackTrace();
-            promise.reject(e.getLocalizedMessage());
+            promise.reject("RNFetchBlob slice error", e.getLocalizedMessage());
         }
     }
 
@@ -597,18 +599,18 @@ static void lstat(String path, final Callback callback) {
             protected Integer doInBackground(String ...args) {
                 WritableArray res = Arguments.createArray();
                 if(args[0] == null) {
-                    callback.invoke("lstat error: the path specified for lstat is either `null` or `undefined`.");
+                    callback.invoke("the path specified for lstat is either `null` or `undefined`.");
                     return 0;
                 }
                 File src = new File(args[0]);
                 if(!src.exists()) {
-                    callback.invoke("lstat error: failed to list path `" + args[0] + "` for it is not exist or it is not a folder");
+                    callback.invoke("failed to lstat path `" + args[0] + "` because it does not exist or it is not a folder");
                     return 0;
                 }
                 if(src.isDirectory()) {
                     String [] files = src.list();
                     for(String p : files) {
-                        res.pushMap(statFile ( src.getPath() + "/" + p));
+                        res.pushMap(statFile(src.getPath() + "/" + p));
                     }
                 }
                 else {
@@ -630,7 +632,7 @@ static void stat(String path, Callback callback) {
             path = normalizePath(path);
             WritableMap result = statFile(path);
             if(result == null)
-                callback.invoke("stat error: failed to list path `" + path + "` for it is not exist or it is not a folder", null);
+                callback.invoke("failed to stat path `" + path + "` because it does not exist or it is not a folder", null);
             else
                 callback.invoke(null, result);
         } catch(Exception err) {
@@ -709,23 +711,24 @@ static void createFile(String path, String data, String encoding, Callback callb
                 String orgPath = data.replace(RNFetchBlobConst.FILE_PREFIX, "");
                 File src = new File(orgPath);
                 if(!src.exists()) {
-                    callback.invoke("RNfetchBlob writeFileError", "source file : " + data + "not exists");
+                    callback.invoke("source file : " + data + " does not exist");
                     return ;
                 }
                 FileInputStream fin = new FileInputStream(src);
                 OutputStream ostream = new FileOutputStream(dest);
-                byte [] buffer = new byte [10240];
+                byte[] buffer = new byte[10240];
                 int read = fin.read(buffer);
-                while(read > 0) {
+                while (read > 0) {
                     ostream.write(buffer, 0, read);
                     read = fin.read(buffer);
                 }
                 fin.close();
                 ostream.close();
-            }
-            else {
+            } else {
                 if (!created) {
-                    callback.invoke("create file error: failed to create file at path `" + path + "` for its parent path may not exists, or the file already exists. If you intended to overwrite the existing file use fs.writeFile instead.");
+                    callback.invoke("failed to create new file at path `" + path + "` because its parent path " +
+                            "may not exist, or the file already exists. If you intended to overwrite the " +
+                            "existing file use fs.writeFile instead.");
                     return;
                 }
                 OutputStream ostream = new FileOutputStream(dest);
@@ -747,12 +750,12 @@ static void createFileASCII(String path, ReadableArray data, Callback callback)
         try {
             File dest = new File(path);
             if(dest.exists()) {
-                callback.invoke("create file error: failed to create file at path `" + path + "`, file already exists.");
+                callback.invoke("failed to create new file at path `" + path + "`, file already exists.");
                 return;
             }
             boolean created = dest.createNewFile();
             if(!created) {
-                callback.invoke("create file error: failed to create file at path `" + path + "` for its parent path may not exists");
+                callback.invoke("failed to create new file at path `" + path + "` because its parent path may not exist");
                 return;
             }
             OutputStream ostream = new FileOutputStream(dest);
diff --git a/class/RNFetchBlobSession.js b/class/RNFetchBlobSession.js
index 02fd54655..f40875cb2 100644
--- a/class/RNFetchBlobSession.js
+++ b/class/RNFetchBlobSession.js
@@ -9,16 +9,11 @@ import {
 } from 'react-native'
 
 const RNFetchBlob = NativeModules.RNFetchBlob
-const emitter = DeviceEventEmitter
 
 let sessions = {}
 
 export default class RNFetchBlobSession {
 
-  add : (path:string) => RNFetchBlobSession;
-  remove : (path:string) => RNFetchBlobSession;
-  dispose : () => Promise;
-  list : () => Array<string>;
   name : string;
 
   static getSession(name:string):any {
@@ -50,7 +45,7 @@ export default class RNFetchBlobSession {
 
   remove(path:string):RNFetchBlobSession {
     let list = sessions[this.name]
-    for(let i in list) {
+    for(let i of list) {
       if(list[i] === path) {
         sessions[this.name].splice(i, 1)
         break;
@@ -67,7 +62,7 @@ export default class RNFetchBlobSession {
     return new Promise((resolve, reject) => {
       RNFetchBlob.removeSession(sessions[this.name], (err) => {
         if(err)
-          reject(err)
+          reject(new Error(err))
         else {
           delete sessions[this.name]
           resolve()
diff --git a/class/RNFetchBlobWriteStream.js b/class/RNFetchBlobWriteStream.js
index d89b9fe2c..b2991905b 100644
--- a/class/RNFetchBlobWriteStream.js
+++ b/class/RNFetchBlobWriteStream.js
@@ -9,15 +9,14 @@ import {
 } from 'react-native'
 
 const RNFetchBlob = NativeModules.RNFetchBlob
-const emitter = DeviceEventEmitter
 
 export default class RNFetchBlobWriteStream {
 
   id : string;
   encoding : string;
-  append : bool;
+  append : boolean;
 
-  constructor(streamId:string, encoding:string, append:string) {
+  constructor(streamId:string, encoding:string, append:boolean) {
     this.id = streamId
     this.encoding = encoding
     this.append = append
@@ -28,17 +27,17 @@ export default class RNFetchBlobWriteStream {
       try {
         let method = this.encoding === 'ascii' ? 'writeArrayChunk' : 'writeChunk'
         if(this.encoding.toLocaleLowerCase() === 'ascii' && !Array.isArray(data)) {
-            reject('ascii input data must be an Array')
+            reject(new Error('ascii input data must be an Array'))
             return
         }
         RNFetchBlob[method](this.id, data, (error) => {
           if(error)
-            reject(error)
+            reject(new Error(error))
           else
             resolve()
         })
       } catch(err) {
-        reject(err)
+        reject(new Error(err))
       }
     })
   }
@@ -50,7 +49,7 @@ export default class RNFetchBlobWriteStream {
           resolve()
         })
       } catch (err) {
-        reject(err)
+        reject(new Error(err))
       }
     })
   }
diff --git a/fs.js b/fs.js
index 83e6bdceb..70ed39d96 100644
--- a/fs.js
+++ b/fs.js
@@ -19,7 +19,7 @@ import type {
 } from './types'
 
 const RNFetchBlob:RNFetchBlobNative = NativeModules.RNFetchBlob
-const emitter = DeviceEventEmitter
+
 const dirs = {
     DocumentDir :  RNFetchBlob.DocumentDir,
     CacheDir : RNFetchBlob.CacheDir,
@@ -83,13 +83,13 @@ function createFile(path:string, data:string, encoding: 'base64' | 'ascii' | 'ut
  * Create write stream to a file.
  * @param  {string} path Target path of file stream.
  * @param  {string} encoding Encoding of input data.
- * @param  {bool} append  A flag represent if data append to existing ones.
- * @return {Promise<WriteStream>} A promise resolves a `WriteStream` object.
+ * @param  {boolean} [append]  A flag represent if data append to existing ones.
+ * @return {Promise<RNFetchBlobWriteStream>} A promise resolves a `WriteStream` object.
  */
 function writeStream(
   path : string,
   encoding : 'utf8' | 'ascii' | 'base64',
-  append? : ?bool,
+  append? : ?boolean,
 ):Promise<RNFetchBlobWriteStream> {
   if(!path)
     throw Error('RNFetchBlob could not open file stream with empty `path`')
@@ -110,6 +110,7 @@ function writeStream(
  * @param  {string} path   The file path.
  * @param  {string} encoding Data encoding, should be one of `base64`, `utf8`, `ascii`
  * @param  {boolean} bufferSize Size of stream buffer.
+ * @param  {number} [tick=10] Interval in milliseconds between reading chunks of data
  * @return {RNFetchBlobStream} RNFetchBlobStream stream instance.
  */
 function readStream(
@@ -154,7 +155,7 @@ function pathForAppGroup(groupName:string):Promise {
  * @param  {'base64' | 'utf8' | 'ascii'} encoding Encoding of read stream.
  * @return {Promise<Array<number> | string>}
  */
-function readFile(path:string, encoding:string, bufferSize:?number):Promise<any> {
+function readFile(path:string, encoding:string):Promise<any> {
   if(typeof path !== 'string')
     return Promise.reject(new Error('Invalid argument "path" '))
   return RNFetchBlob.readFile(path, encoding)
@@ -170,7 +171,7 @@ function readFile(path:string, encoding:string, bufferSize:?number):Promise<any>
 function writeFile(path:string, data:string | Array<number>, encoding:?string):Promise {
   encoding = encoding || 'utf8'
   if(typeof path !== 'string')
-    return Promise.reject('Invalid argument "path" ')
+    return Promise.reject(new Error('Invalid argument "path" '))
   if(encoding.toLocaleLowerCase() === 'ascii') {
     if(!Array.isArray(data))
       return Promise.reject(new Error(`Expected "data" is an Array when encoding is "ascii", however got ${typeof data}`))
@@ -187,7 +188,7 @@ function writeFile(path:string, data:string | Array<number>, encoding:?string):P
 function appendFile(path:string, data:string | Array<number>, encoding:?string):Promise {
   encoding = encoding || 'utf8'
   if(typeof path !== 'string')
-    return Promise.reject('Invalid argument "path" ')
+    return Promise.reject(new Error('Invalid argument "path" '))
   if(encoding.toLocaleLowerCase() === 'ascii') {
     if(!Array.isArray(data))
       return Promise.reject(new Error(`Expected "data" is an Array when encoding is "ascii", however got ${typeof data}`))
@@ -224,7 +225,7 @@ function stat(path:string):Promise<RNFetchBlobFile> {
 
 /**
  * Android only method, request media scanner to scan the file.
- * @param  {Array<Object<string, string>>} Array contains Key value pairs with key `path` and `mime`.
+ * @param  {Array<Object<string, string>>} pairs Array contains Key value pairs with key `path` and `mime`.
  * @return {Promise}
  */
 function scanFile(pairs:any):Promise {
@@ -302,10 +303,9 @@ function unlink(path:string):Promise {
 /**
  * Check if file exists and if it is a folder.
  * @param  {string} path Path to check
- * @return {Promise<bool, bool>}
+ * @return {Promise<boolean, boolean>}
  */
-function exists(path:string):Promise<bool, bool> {
-
+function exists(path:string):Promise<boolean, boolean> {
   return new Promise((resolve, reject) => {
     try {
       RNFetchBlob.exists(path, (exist) => {
@@ -358,7 +358,7 @@ function df():Promise<{ free : number, total : number }> {
   return new Promise((resolve, reject) => {
     RNFetchBlob.df((err, stat) => {
       if(err)
-        reject(err)
+        reject(new Error(err))
       else
         resolve(stat)
     })
diff --git a/index.js b/index.js
index c8ed1a9f6..a4812cb7d 100644
--- a/index.js
+++ b/index.js
@@ -17,7 +17,7 @@ import type {
   RNFetchBlobResponseInfo
 } from './types'
 import URIUtil from './utils/uri'
-import StatefulPromise from './class/StatefulPromise.js'
+//import StatefulPromise from './class/StatefulPromise.js'
 import fs from './fs'
 import getUUID from './utils/uuid'
 import base64 from 'base-64'
@@ -118,7 +118,7 @@ function config (options:RNFetchBlobConfig) {
  * @param  {string} method     Should be one of `get`, `post`, `put`
  * @param  {string} url        A file URI string
  * @param  {string} headers    Arguments of file system API
- * @param  {any} body       Data to put or post to file systen.
+ * @param  {any}    body       Data to put or post to file systen.
  * @return {Promise}
  */
 function fetchFile(options = {}, method, url, headers = {}, body):Promise {
@@ -520,13 +520,12 @@ class FetchBlobResponse {
     }
     /**
      * Start read stream from cached file
-     * @param  {String} encoding Encode type, should be one of `base64`, `ascrii`, `utf8`.
-     * @param  {Function} fn On data event handler
+     * @param  {String} encoding Encode type, should be one of `base64`, `ascii`, `utf8`.
      * @return {void}
      */
-    this.readStream = (encode: 'base64' | 'utf8' | 'ascii'):RNFetchBlobStream | null => {
+    this.readStream = (encoding: 'base64' | 'utf8' | 'ascii'):RNFetchBlobStream | null => {
       if(this.type === 'path') {
-        return readStream(this.data, encode)
+        return readStream(this.data, encoding)
       }
       else {
         console.warn('RNFetchblob', 'this response data does not contains any available stream')
@@ -539,10 +538,10 @@ class FetchBlobResponse {
      * @param  {String} encoding Encode type, should be one of `base64`, `ascrii`, `utf8`.
      * @return {String}
      */
-    this.readFile = (encode: 'base64' | 'utf8' | 'ascii') => {
+    this.readFile = (encoding: 'base64' | 'utf8' | 'ascii') => {
       if(this.type === 'path') {
-        encode = encode || 'utf8'
-        return readFile(this.data, encode)
+          encoding = encoding || 'utf8'
+        return readFile(this.data, encoding)
       }
       else {
         console.warn('RNFetchblob', 'this response does not contains a readable file')
diff --git a/ios.js b/ios.js
index 566b424e2..9d04361d6 100644
--- a/ios.js
+++ b/ios.js
@@ -13,7 +13,7 @@ const RNFetchBlob:RNFetchBlobNative = NativeModules.RNFetchBlob
 
 /**
  * Open a file using UIDocumentInteractionController
- * @param  {string]} path Path of the file to be open.
+ * @param  {string} path Path of the file to be open.
  * @param  {string} scheme URI scheme that needs to support, optional
  * @return {Promise}
  */
@@ -26,7 +26,7 @@ function previewDocument(path:string, scheme:string) {
 
 /**
  * Preview a file using UIDocumentInteractionController
- * @param  {string]} path Path of the file to be open.
+ * @param  {string} path Path of the file to be open.
  * @param  {string} scheme URI scheme that needs to support, optional
  * @return {Promise}
  */
diff --git a/ios/RNFetchBlob/RNFetchBlob.m b/ios/RNFetchBlob/RNFetchBlob.m
index 246d6707c..5eee349b2 100644
--- a/ios/RNFetchBlob/RNFetchBlob.m
+++ b/ios/RNFetchBlob/RNFetchBlob.m
@@ -194,7 +194,7 @@ - (NSDictionary *)constantsToExport
     if(path) {
         resolve(path);
     } else {
-        reject(@"RNFetchBlob file not found", @"could not find path for app group", nil);
+        reject(@"RNFetchBlob pathForAppGroup Error", @"could not find path for app group", nil);
     }
 }
 
@@ -223,7 +223,7 @@ - (NSDictionary *)constantsToExport
     BOOL isDir = nil;
     BOOL exist = [fm fileExistsAtPath:path isDirectory:&isDir];
     if( exist == NO || isDir == YES) {
-        callback(@[[NSString stringWithFormat:@"target path `%@` may not exists or it's a folder", path]]);
+        callback(@[[NSString stringWithFormat:@"target path `%@` may not exist or it is a folder", path]]);
         return;
     }
     NSString * streamId = [fileStream openWithPath:path encode:encoding appendData:append];
@@ -326,7 +326,7 @@ - (NSDictionary *)constantsToExport
 
             exist = [fm fileExistsAtPath:path isDirectory:&isDir];
             if(exist == NO) {
-                callback(@[[NSString stringWithFormat:@"failed to stat path `%@` for it is not exist or it is not exist", path]]);
+                callback(@[[NSString stringWithFormat:@"failed to stat path `%@` because it does not exist or it is not a folder", path]]);
                 return ;
             }
             result = [RNFetchBlobFS stat:path error:&error];
@@ -362,7 +362,7 @@ - (NSDictionary *)constantsToExport
 
     exist = [fm fileExistsAtPath:path isDirectory:&isDir];
     if(exist == NO) {
-        callback(@[[NSString stringWithFormat:@"failed to list path `%@` for it is not exist or it is not exist", path]]);
+        callback(@[[NSString stringWithFormat:@"failed to lstat path `%@` because it does not exist or it is not a folder", path]]);
         return ;
     }
     NSError * error = nil;
@@ -447,7 +447,7 @@ - (NSDictionary *)constantsToExport
     [RNFetchBlobFS readFile:path encoding:encoding onComplete:^(id content, NSString * err) {
         if(err != nil)
         {
-            reject(@"RNFetchBlob failed to read file", err, nil);
+            reject(@"RNFetchBlob readFile Error", err, nil);
             return;
         }
         if(encoding == @"ascii")
@@ -529,7 +529,7 @@ - (NSDictionary *)constantsToExport
       });
         resolve(@[[NSNull null]]);
     } else {
-        reject(@"RNFetchBlob could not open document", @"scheme is not supported", nil);
+        reject(@"RNFetchBlob previewDocument Error", @"scheme is not supported", nil);
     }
 }
 
@@ -549,7 +549,7 @@ - (NSDictionary *)constantsToExport
         });
         resolve(@[[NSNull null]]);
     } else {
-        reject(@"RNFetchBlob could not open document", @"scheme is not supported", nil);
+        reject(@"RNFetchBlob openDocument Error", @"scheme is not supported", nil);
     }
 }
 
@@ -563,7 +563,7 @@ - (NSDictionary *)constantsToExport
     {
         resolve(@[[NSNull null]]);
     } else {
-        reject(@"RNFetchBlob could not open document", [error description], nil);
+        reject(@"RNFetchBlob excludeFromBackupKey Error", [error description], nil);
     }
 
 }
diff --git a/ios/RNFetchBlobFS.m b/ios/RNFetchBlobFS.m
index 5e102d184..183569e35 100644
--- a/ios/RNFetchBlobFS.m
+++ b/ios/RNFetchBlobFS.m
@@ -163,7 +163,7 @@ + (void) readStream:(NSString *)uri
             {
                 if([[NSFileManager defaultManager] fileExistsAtPath:path] == NO)
                 {
-                    NSString * message = [NSString stringWithFormat:@"File not exists at path %@", path];
+                    NSString * message = [NSString stringWithFormat:@"File does not exist at path %@", path];
                     NSDictionary * payload = @{ @"event": FS_EVENT_ERROR, @"detail": message };
                     [event sendDeviceEventWithName:streamId body:payload];
                     free(buffer);
@@ -254,11 +254,11 @@ + (void) emitDataChunks:(NSData *)data encoding:(NSString *) encoding streamId:(
                     [asciiArray addObject:[NSNumber numberWithChar:bytePtr[i]]];
                 }
             }
-            
+
             NSDictionary * payload = @{ @"event": FS_EVENT_DATA,  @"detail" : asciiArray };
             [event sendDeviceEventWithName:streamId body:payload];
         }
-        
+
     }
     @catch (NSException * ex)
     {
@@ -335,7 +335,7 @@ + (void) writeFile:(NSString *)path encoding:(NSString *)encoding data:(NSString
     @try {
         NSFileManager * fm = [NSFileManager defaultManager];
         NSError * err = nil;
-        // check if the folder exists, if not exists, create folders recursively
+        // check if the folder exists, if it does not exist create folders recursively
         // after the folders created, write data into the file
         NSString * folder = [path stringByDeletingLastPathComponent];
         encoding = [encoding lowercaseString];
@@ -452,13 +452,13 @@ + (void) readFile:(NSString *)path
         else
         {
             if(![[NSFileManager defaultManager] fileExistsAtPath:path]) {
-                onComplete(nil, @"file not exists");
+                onComplete(nil, @"file does not exist");
                 return;
             }
             fileContent = [NSData dataWithContentsOfFile:path];
-            
+
         }
-        
+
         if(encoding != nil)
         {
             if([[encoding lowercaseString] isEqualToString:@"utf8"])
@@ -485,7 +485,7 @@ + (void) readFile:(NSString *)path
         {
             onComplete(fileContent, nil);
         }
-        
+
     }];
 }
 
@@ -495,7 +495,7 @@ + (void) readFile:(NSString *)path
 + (BOOL) mkdir:(NSString *) path {
     BOOL isDir;
     NSError * err = nil;
-    // if temp folder not exists, create one
+    // if temp folder does not exist create it
     if(![[NSFileManager defaultManager] fileExistsAtPath: path isDirectory:&isDir]) {
         [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:&err];
     }
@@ -571,7 +571,7 @@ - (void)writeEncodeChunk:(NSString *) chunk {
     NSData * decodedData = nil;
     if([[self.encoding lowercaseString] isEqualToString:@"base64"]) {
         decodedData = [[NSData alloc] initWithBase64EncodedString:chunk options: NSDataBase64DecodingIgnoreUnknownCharacters];
-    } 
+    }
     else if([[self.encoding lowercaseString] isEqualToString:@"utf8"]) {
         decodedData = [chunk dataUsingEncoding:NSUTF8StringEncoding];
     }
@@ -632,10 +632,10 @@ + (void)slice:(NSString *)path
             NSFileManager * fm = [NSFileManager defaultManager];
             NSOutputStream * os = [[NSOutputStream alloc] initToFileAtPath:dest append:NO];
             [os open];
-            // abort for the source file not exists
+            // abort because the source file does not exist
             if([fm fileExistsAtPath:path] == NO)
             {
-                reject(@"RNFetchBlob slice failed : the file does not exists", path, nil);
+                reject(@"RNFetchBlob slice Error : the file does not exist", path, nil);
                 return;
             }
             long size = [fm attributesOfItemAtPath:path error:nil].fileSize;
@@ -712,7 +712,7 @@ + (void)slice:(NSString *)path
         }
         else
         {
-            reject(@"slice error",  [NSString stringWithFormat: @"could not resolve URI %@", path ], nil);
+            reject(@"RNFetchBlob slice Error",  [NSString stringWithFormat: @"could not resolve URI %@", path ], nil);
         }
 
     }];
@@ -765,7 +765,7 @@ +(void) df:(RCTResponseSenderBlock)callback
     if (dictionary) {
         NSNumber *fileSystemSizeInBytes = [dictionary objectForKey: NSFileSystemSize];
         NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];
-        
+
         callback(@[[NSNull null], @{
                   @"free" : freeFileSystemSizeInBytes,
                   @"total" : fileSystemSizeInBytes,
@@ -793,4 +793,4 @@ + (void) writeAssetToPath:(ALAssetRepresentation * )rep dest:(NSString *)dest
     return;
 }
 
-@end
\ No newline at end of file
+@end
diff --git a/json-stream.js b/json-stream.js
index 8d901305d..cb19d02d8 100644
--- a/json-stream.js
+++ b/json-stream.js
@@ -2,14 +2,17 @@ import Oboe from './lib/oboe-browser.min.js'
 import XMLHttpRequest from './polyfill/XMLHttpRequest'
 import URIUtil from './utils/uri'
 
-const OboeExtended = (arg: string | object) => {
+const OboeExtended = (arg: string | Object) => {
 
 
   window.location = ''
 
   if(!window.XMLHttpRequest.isRNFBPolyfill ) {
     window.XMLHttpRequest = XMLHttpRequest
-    console.warn('Use JSONStream will automatically replace window.XMLHttpRequest with RNFetchBlob.polyfill.XMLHttpRequest. You are seeing this warning because you did not replace it maually.')
+    console.warn(
+        'Use JSONStream will automatically replace window.XMLHttpRequest with RNFetchBlob.polyfill.XMLHttpRequest. ' +
+        'You are seeing this warning because you did not replace it manually.'
+    )
   }
 
   if(typeof arg === 'string') {
diff --git a/package.json b/package.json
index 0d88ec178..a93dba81d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "react-native-fetch-blob",
-  "version": "0.10.7",
+  "version": "0.10.8",
   "description": "A module provides upload, download, and files access API. Supports file stream read/write for process large files.",
   "main": "index.js",
   "scripts": {