diff --git a/.eslintrc.json b/.eslintrc.json
index 136529a..1761d48 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,12 +1,12 @@
 {
     "root": true,
-    "extends": "eslint:recommended",
+    "extends": "airbnb-base",
     "env": {
         "node": true,
         "es6": true
     },
     "parserOptions": {
-        "ecmaVersion": 6,
+        "ecmaVersion": 2018,
         "sourceType": "module"
     },
     "rules": {
@@ -15,6 +15,11 @@
         "no-trailing-spaces": 2,
         "eol-last": 2,
         "space-in-parens": ["error", "never"],
-        "no-multiple-empty-lines": 1
+        "no-multiple-empty-lines": 1,
+        "no-underscore-dangle": 0,
+        "no-new": 0,
+        "func-names": 0,
+        "prefer-destructuring": 0,
+        "prefer-object-spread": 0
     }
 }
diff --git a/index.js b/index.js
index 7b76ae2..9cc4d61 100644
--- a/index.js
+++ b/index.js
@@ -1,22 +1,21 @@
-'use strict';
 // S3Adapter
 //
 // Stores Parse files in AWS S3.
 
-var AWS = require('aws-sdk');
-var optionsFromArguments = require('./lib/optionsFromArguments');
+const AWS = require('aws-sdk');
+const optionsFromArguments = require('./lib/optionsFromArguments');
 
 const awsCredentialsDeprecationNotice = function awsCredentialsDeprecationNotice() {
   // eslint-disable-next-line no-console
   console.warn('Passing AWS credentials to this adapter is now DEPRECATED and will be removed in a future version',
     'See: https://github.com/parse-server-modules/parse-server-s3-adapter#aws-credentials for details');
-}
+};
 
 // Creates an S3 session.
 // Providing AWS access, secret keys and bucket are mandatory
 // Region will use sane defaults if omitted
-function S3Adapter() {
-  var options = optionsFromArguments(arguments);
+function S3Adapter(...args) {
+  const options = optionsFromArguments(args);
   this._region = options.region;
   this._bucket = options.bucket;
   this._bucketPrefix = options.bucketPrefix;
@@ -27,11 +26,11 @@ function S3Adapter() {
   this._globalCacheControl = options.globalCacheControl;
   this._encryption = options.ServerSideEncryption;
 
-  let s3Options = {
+  const s3Options = {
     params: { Bucket: this._bucket },
     region: this._region,
     signatureVersion: this._signatureVersion,
-    globalCacheControl: this._globalCacheControl
+    globalCacheControl: this._globalCacheControl,
   };
 
   if (options.accessKey && options.secretKey) {
@@ -46,8 +45,8 @@ function S3Adapter() {
   this._hasBucket = false;
 }
 
-S3Adapter.prototype.createBucket = function() {
-  var promise;
+S3Adapter.prototype.createBucket = function () {
+  let promise;
   if (this._hasBucket) {
     promise = Promise.resolve();
   } else {
@@ -59,118 +58,110 @@ S3Adapter.prototype.createBucket = function() {
     });
   }
   return promise;
-}
+};
 
 // For a given config object, filename, and data, store a file in S3
 // Returns a promise containing the S3 object creation response
-S3Adapter.prototype.createFile = function(filename, data, contentType) {
-  let params = {
+S3Adapter.prototype.createFile = function (filename, data, contentType) {
+  const params = {
     Key: this._bucketPrefix + filename,
-    Body: data
+    Body: data,
   };
   if (this._directAccess) {
-    params.ACL = "public-read"
+    params.ACL = 'public-read';
   }
   if (contentType) {
     params.ContentType = contentType;
   }
-  if(this._globalCacheControl) {
+  if (this._globalCacheControl) {
     params.CacheControl = this._globalCacheControl;
   }
-  if(this._encryption == 'AES256' || this._encryption == 'aws:kms'){
+  if (this._encryption === 'AES256' || this._encryption === 'aws:kms') {
     params.ServerSideEncryption = this._encryption;
   }
-  return this.createBucket().then(() => {
-    return new Promise((resolve, reject) => {
-      this._s3Client.upload(params, (err, data) => {
-        if (err !== null) {
-          return reject(err);
-        }
-        resolve(data);
-      });
+  return this.createBucket().then(() => new Promise((resolve, reject) => {
+    this._s3Client.upload(params, (err, response) => {
+      if (err !== null) {
+        return reject(err);
+      }
+      return resolve(response);
     });
-  });
-}
+  }));
+};
 
-S3Adapter.prototype.deleteFile = function(filename) {
-  return this.createBucket().then(() => {
-    return new Promise((resolve, reject) => {
-      let params = {
-        Key: this._bucketPrefix + filename
-      };
-      this._s3Client.deleteObject(params, (err, data) =>{
-        if(err !== null) {
-          return reject(err);
-        }
-        resolve(data);
-      });
+S3Adapter.prototype.deleteFile = function (filename) {
+  return this.createBucket().then(() => new Promise((resolve, reject) => {
+    const params = {
+      Key: this._bucketPrefix + filename,
+    };
+    this._s3Client.deleteObject(params, (err, data) => {
+      if (err !== null) {
+        return reject(err);
+      }
+      return resolve(data);
     });
-  });
-}
+  }));
+};
 
 // Search for and return a file if found by filename
 // Returns a promise that succeeds with the buffer result from S3
-S3Adapter.prototype.getFileData = function(filename) {
-  let params = {Key: this._bucketPrefix + filename};
-  return this.createBucket().then(() => {
-    return new Promise((resolve, reject) => {
-      this._s3Client.getObject(params, (err, data) => {
-        if (err !== null) {
-          return reject(err);
-        }
-        // Something happened here...
-        if (data && !data.Body) {
-          return reject(data);
-        }
-        resolve(data.Body);
-      });
+S3Adapter.prototype.getFileData = function (filename) {
+  const params = { Key: this._bucketPrefix + filename };
+  return this.createBucket().then(() => new Promise((resolve, reject) => {
+    this._s3Client.getObject(params, (err, data) => {
+      if (err !== null) {
+        return reject(err);
+      }
+      // Something happened here...
+      if (data && !data.Body) {
+        return reject(data);
+      }
+      return resolve(data.Body);
     });
-  });
-}
+  }));
+};
 
 // Generates and returns the location of a file stored in S3 for the given request and filename
-// The location is the direct S3 link if the option is set, otherwise we serve the file through parse-server
-S3Adapter.prototype.getFileLocation = function(config, filename) {
-  filename = encodeURIComponent(filename);
+// The location is the direct S3 link if the option is set,
+// otherwise we serve the file through parse-server
+S3Adapter.prototype.getFileLocation = function (config, filename) {
+  const fileName = encodeURIComponent(filename);
   if (this._directAccess) {
     if (this._baseUrl && this._baseUrlDirect) {
-      return `${this._baseUrl}/${filename}`;
-    } else if (this._baseUrl) {
-      return `${this._baseUrl}/${this._bucketPrefix + filename}`;
-    } else {
-      return `https://${this._bucket}.s3.amazonaws.com/${this._bucketPrefix + filename}`;
+      return `${this._baseUrl}/${fileName}`;
+    } if (this._baseUrl) {
+      return `${this._baseUrl}/${this._bucketPrefix + fileName}`;
     }
+    return `https://${this._bucket}.s3.amazonaws.com/${this._bucketPrefix + fileName}`;
   }
-  return (config.mount + '/files/' + config.applicationId + '/' + filename);
-}
+  return (`${config.mount}/files/${config.applicationId}/${fileName}`);
+};
 
 S3Adapter.prototype.handleFileStream = function (filename, req, res) {
   const params = {
     Key: this._bucketPrefix + filename,
     Range: req.get('Range'),
   };
-  return this.createBucket().then(() => {
-    return new Promise((resolve, reject) => {
-      this._s3Client.getObject(params, (error, data) => {
-        if (error !== null) {
-          return reject(error);
-        }
-        if (data && !data.Body) {
-          return reject(data);
-        }
-        res.writeHead(206, {
-          'Accept-Ranges': data.AcceptRanges,
-          'Content-Length': data.ContentLength,
-          'Content-Range': data.ContentRange,
-          'Content-Type': data.ContentType,
-        });
-        res.write(data.Body);
-        res.end();
-        resolve(data.Body);
+  return this.createBucket().then(() => new Promise((resolve, reject) => {
+    this._s3Client.getObject(params, (error, data) => {
+      if (error !== null) {
+        return reject(error);
+      }
+      if (data && !data.Body) {
+        return reject(data);
+      }
+      res.writeHead(206, {
+        'Accept-Ranges': data.AcceptRanges,
+        'Content-Length': data.ContentLength,
+        'Content-Range': data.ContentRange,
+        'Content-Type': data.ContentType,
       });
+      res.write(data.Body);
+      res.end();
+      return resolve(data.Body);
     });
-  });
-}
+  }));
+};
 
 module.exports = S3Adapter;
 module.exports.default = S3Adapter;
diff --git a/lib/optionsFromArguments.js b/lib/optionsFromArguments.js
index b4c463a..ea6ca86 100644
--- a/lib/optionsFromArguments.js
+++ b/lib/optionsFromArguments.js
@@ -1,32 +1,34 @@
-'use strict';
 
 const DEFAULT_S3_REGION = 'us-east-1';
 
 function requiredOrFromEnvironment(options, key, env) {
-  options[key] = options[key] || process.env[env];
-  if (!options[key]) {
-    throw `S3Adapter requires option '${key}' or env. variable ${env}`;
+  const opts = Object.assign({}, options);
+  opts[key] = options[key] || process.env[env];
+  if (!opts[key]) {
+    throw new Error(`S3Adapter requires option '${key}' or env. variable ${env}`);
   }
-  return options;
+  return opts;
 }
 
 function fromEnvironmentOrDefault(options, key, env, defaultValue) {
-  options[key] = options[key] || process.env[env] || defaultValue;
+  const opts = Object.assign({}, options);
+  opts[key] = options[key] || process.env[env] || defaultValue;
   // If we used the overrides,
   // make sure they take priority
-  if(options.s3overrides){
-    if(options.s3overrides[key]){
-      options[key] = options.s3overrides[key];
-    }else if (options.s3overrides.params && options.s3overrides.params.Bucket) {
-      options.bucket = options.s3overrides.params.Bucket;
+  if (opts.s3overrides) {
+    if (opts.s3overrides[key]) {
+      opts[key] = opts.s3overrides[key];
+    } else if (opts.s3overrides.params && opts.s3overrides.params.Bucket) {
+      opts.bucket = opts.s3overrides.params.Bucket;
     }
   }
-  return options;
+  return opts;
 }
 
 function fromOptionsDictionaryOrDefault(options, key, defaultValue) {
-  options[key] = options[key] || defaultValue;
-  return options;
+  const opts = Object.assign({}, options);
+  opts[key] = options[key] || defaultValue;
+  return opts;
 }
 
 const optionsFromArguments = function optionsFromArguments(args) {
@@ -35,17 +37,17 @@ const optionsFromArguments = function optionsFromArguments(args) {
   let s3overrides = {};
   let otherOptions;
 
-  if (typeof stringOrOptions == 'string') {
-    if (args.length == 1) {
+  if (typeof stringOrOptions === 'string') {
+    if (args.length === 1) {
       options.bucket = stringOrOptions;
-    } else if (args.length == 2) {
+    } else if (args.length === 2) {
       options.bucket = stringOrOptions;
-      if (typeof args[1] != 'object') {
+      if (typeof args[1] !== 'object') {
         throw new Error('Failed to configure S3Adapter. Arguments don\'t make sense');
       }
       otherOptions = args[1];
     } else if (args.length > 2) {
-      if (typeof args[1] != 'string' || typeof args[2] != 'string') {
+      if (typeof args[1] !== 'string' || typeof args[2] !== 'string') {
         throw new Error('Failed to configure S3Adapter. Arguments don\'t make sense');
       }
       options.accessKey = args[0];
@@ -63,19 +65,17 @@ const optionsFromArguments = function optionsFromArguments(args) {
       options.globalCacheControl = otherOptions.globalCacheControl;
       options.ServerSideEncryption = otherOptions.ServerSideEncryption;
     }
-  } else {
-    if (args.length == 1) {
-      Object.assign(options, stringOrOptions);
-    } else if (args.length == 2) {
-      Object.assign(options, stringOrOptions);
-      s3overrides = args[1];
+  } else if (args.length === 1) {
+    Object.assign(options, stringOrOptions);
+  } else if (args.length === 2) {
+    Object.assign(options, stringOrOptions);
+    s3overrides = args[1];
 
-      if (s3overrides.params) {
-        options.bucket = s3overrides.params.Bucket;
-      }
-    } else if (args.length > 2) {
-      throw new Error('Failed to configure S3Adapter. Arguments don\'t make sense');
+    if (s3overrides.params) {
+      options.bucket = s3overrides.params.Bucket;
     }
+  } else if (args.length > 2) {
+    throw new Error('Failed to configure S3Adapter. Arguments don\'t make sense');
   }
 
   options = fromOptionsDictionaryOrDefault(options, 's3overrides', s3overrides);
@@ -88,10 +88,9 @@ const optionsFromArguments = function optionsFromArguments(args) {
   options = fromEnvironmentOrDefault(options, 'baseUrl', 'S3_BASE_URL', null);
   options = fromEnvironmentOrDefault(options, 'baseUrlDirect', 'S3_BASE_URL_DIRECT', false);
   options = fromEnvironmentOrDefault(options, 'signatureVersion', 'S3_SIGNATURE_VERSION', 'v4');
-  options = fromEnvironmentOrDefault(
-    options, 'globalCacheControl', 'S3_GLOBAL_CACHE_CONTROL', null);
+  options = fromEnvironmentOrDefault(options, 'globalCacheControl', 'S3_GLOBAL_CACHE_CONTROL', null);
 
   return options;
-}
+};
 
 module.exports = optionsFromArguments;
diff --git a/package-lock.json b/package-lock.json
index c048076..2b230c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,26 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
     "abbrev": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
@@ -11,27 +31,16 @@
       "dev": true
     },
     "acorn": {
-      "version": "5.7.3",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.3.tgz",
-      "integrity": "sha512-T/zvzYRfbVojPWahDsE5evJdHb3oJoQfFbsrKM7w5Zcs++Tr257tia3BmMP8XYVjp1S9RZXQMh7gao96BlqZOw==",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.0.0.tgz",
+      "integrity": "sha512-PaF/MduxijYYt7unVGRuds1vBC9bFxbNf+VWqhOClfdgy7RlVkQqt610ig1/yxTgsDIfW1cWDel5EBbOy3jdtQ==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "3.0.1",
-      "resolved": "http://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
-      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
-      "dev": true,
-      "requires": {
-        "acorn": "^3.0.4"
-      },
-      "dependencies": {
-        "acorn": {
-          "version": "3.3.0",
-          "resolved": "http://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
-          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
-          "dev": true
-        }
-      }
+      "version": "5.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
+      "integrity": "sha512-tiNTrP1MP0QrChmD2DdupCr6HWSFeKVw5d/dHTu4Y7rkAkRhU/Dt7dphAfIUyxtHpl/eBVip5uTNSpQJHylpAw==",
+      "dev": true
     },
     "ajv": {
       "version": "5.5.2",
@@ -45,12 +54,6 @@
         "json-schema-traverse": "^0.3.0"
       }
     },
-    "ajv-keywords": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
-      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
-      "dev": true
-    },
     "amdefine": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
@@ -59,22 +62,25 @@
       "optional": true
     },
     "ansi-escapes": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.1.0.tgz",
-      "integrity": "sha512-UgAb8H9D41AQnu/PbWlCofQVcnV4Gs2bBJi9eZPxfU/hgglFh3SMDMENRIqdr7H6XFnXdoknctFByVsCOotTVw==",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha512-cBhpre4ma+U0T1oM5fXg7Dy1Jw7zzwv7lt/GoCpr+hDQJoYnKVPLL4dCvSEFMmQurOQvSrwT7SL/DAlhBI97RQ==",
       "dev": true
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
     },
     "argparse": {
       "version": "1.0.9",
@@ -91,27 +97,16 @@
       "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
       "dev": true
     },
-    "array-union": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz",
-      "integrity": "sha1-mjRBDk9OPaI96jdb5b5w8kd47Dk=",
+    "array-includes": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/array-includes/-/array-includes-3.0.3.tgz",
+      "integrity": "sha1-GEtI9i2S10UrsxsyMWXH+L0CJm0=",
       "dev": true,
       "requires": {
-        "array-uniq": "^1.0.1"
+        "define-properties": "^1.1.2",
+        "es-abstract": "^1.7.0"
       }
     },
-    "array-uniq": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz",
-      "integrity": "sha1-r2rId6Jcx/dOBYiUdThY39sk/bY=",
-      "dev": true
-    },
-    "arrify": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
-      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
-      "dev": true
-    },
     "asn1": {
       "version": "0.2.4",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.4.tgz",
@@ -127,6 +122,12 @@
       "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
       "dev": true
     },
+    "astral-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
+      "integrity": "sha512-+Ryf6g3BKoRc7jfp7ad8tM4TtMiaWvbF/1/sQcZPkkS7ag3D5nMBCe2UfOTONtAkaG0tO0ij3C5Lwmf1EiyjHg==",
+      "dev": true
+    },
     "async": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
@@ -167,41 +168,6 @@
       "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
       "dev": true
     },
-    "babel-code-frame": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
-      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
-      "dev": true,
-      "requires": {
-        "chalk": "^1.1.3",
-        "esutils": "^2.0.2",
-        "js-tokens": "^3.0.2"
-      },
-      "dependencies": {
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "http://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "^2.2.1",
-            "escape-string-regexp": "^1.0.2",
-            "has-ansi": "^2.0.0",
-            "strip-ansi": "^3.0.0",
-            "supports-color": "^2.0.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
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+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.10.2",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.2.tgz",
+          "integrity": "sha512-TXtUUEYHuaTEbLZWIKUr5pmBuhDLy+8KYtPYdcV8qC+pOZL+NKqYwvWSRrVXHn+ZmRRAu8vJTAznH7Oag6RVRw==",
+          "dev": true,
+          "requires": {
+            "fast-deep-equal": "^2.0.1",
+            "fast-json-stable-stringify": "^2.0.0",
+            "json-schema-traverse": "^0.4.1",
+            "uri-js": "^4.2.2"
+          }
+        },
+        "fast-deep-equal": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/fast-deep-equal/-/fast-deep-equal-2.0.1.tgz",
+          "integrity": "sha1-ewUhjd+WZ79/Nwv3/bLLFf3Qqkk=",
+          "dev": true
+        },
+        "json-schema-traverse": {
+          "version": "0.4.1",
+          "resolved": "https://registry.npmjs.org/json-schema-traverse/-/json-schema-traverse-0.4.1.tgz",
+          "integrity": "sha512-xbbCH5dCYU5T8LcEhhuh7HJ88HXuW3qsI3Y0zOZFKfZEHcpWiHU/Jxzk629Brsab/mMiHQti9wMP+845RPe3Vg==",
+          "dev": true
+        },
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
       }
     },
     "text-table": {
@@ -1917,6 +2232,12 @@
         }
       }
     },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ==",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -1941,12 +2262,6 @@
         "prelude-ls": "~1.1.2"
       }
     },
-    "typedarray": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "dev": true
-    },
     "uglify-js": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
@@ -1967,6 +2282,23 @@
         }
       }
     },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.1.1.tgz",
+          "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
+          "dev": true
+        }
+      }
+    },
     "url": {
       "version": "0.10.3",
       "resolved": "https://registry.npmjs.org/url/-/url-0.10.3.tgz",
@@ -1982,17 +2314,27 @@
       "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
       "dev": true
     },
-    "util-deprecate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
-      "dev": true
-    },
     "uuid": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
       "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g=="
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
     "verror": {
       "version": "1.10.0",
       "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
@@ -2026,9 +2368,9 @@
       "dev": true
     },
     "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
       "dev": true,
       "requires": {
         "mkdirp": "^0.5.1"
@@ -2047,12 +2389,6 @@
       "version": "9.0.7",
       "resolved": "http://registry.npmjs.org/xmlbuilder/-/xmlbuilder-9.0.7.tgz",
       "integrity": "sha1-Ey7mPS7FVlxVfiD0wi35rKaGsQ0="
-    },
-    "yallist": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
-      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
     }
   }
 }
diff --git a/package.json b/package.json
index d3dd4fa..a789a5c 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
   "scripts": {
     "pretest": "npm run lint",
     "test": "NODE_ENV=test NODE_CONFIG_DIR=./spec/config istanbul cover -x **/spec/** jasmine --captureExceptions",
-    "lint": "eslint --cache ./"
+    "lint": "eslint --cache ./",
+    "lint:fix": "eslint --fix --cache ./"
   },
   "repository": {
     "type": "git",
@@ -29,7 +30,9 @@
   "devDependencies": {
     "codecov": "^3.0.0",
     "config": "^1.24.0",
-    "eslint": "^4.1.0",
+    "eslint": "6.3.0",
+    "eslint-config-airbnb-base": "14.0.0",
+    "eslint-plugin-import": "2.18.2",
     "istanbul": "^0.4.2",
     "jasmine": "^2.4.1",
     "parse-server-conformance-tests": "^1.0.0"
diff --git a/spec/test.spec.js b/spec/test.spec.js
index 1fa79b8..cd5a734 100644
--- a/spec/test.spec.js
+++ b/spec/test.spec.js
@@ -1,5 +1,3 @@
-'use strict';
-
 const config = require('config');
 const filesAdapterTests = require('parse-server-conformance-tests').files;
 const S3Adapter = require('../index.js');
@@ -9,34 +7,35 @@ describe('S3Adapter tests', () => {
   beforeEach(() => {
     delete process.env.S3_BUCKET;
     delete process.env.S3_REGION;
+    spyOn(console, 'warn').and.returnValue();
   });
 
   it('should throw when not initialized properly', () => {
     expect(() => {
       new S3Adapter();
-    }).toThrow("S3Adapter requires option 'bucket' or env. variable S3_BUCKET");
+    }).toThrow(new Error("S3Adapter requires option 'bucket' or env. variable S3_BUCKET"));
 
     expect(() => {
       new S3Adapter('accessKey', 'secretKey', {});
     }).toThrow(new Error('Failed to configure S3Adapter. Arguments don\'t make sense'));
 
     expect(() => {
-      new S3Adapter({ accessKey: 'accessKey' , secretKey: 'secretKey'});
-    }).toThrow("S3Adapter requires option 'bucket' or env. variable S3_BUCKET")
-  })
+      new S3Adapter({ accessKey: 'accessKey', secretKey: 'secretKey' });
+    }).toThrow(new Error("S3Adapter requires option 'bucket' or env. variable S3_BUCKET"));
+  });
 
   it('should not throw when initialized properly', () => {
     expect(() => {
       new S3Adapter('bucket');
-    }).not.toThrow()
+    }).not.toThrow();
 
     expect(() => {
-      new S3Adapter({ bucket: 'bucket'});
-    }).not.toThrow()
+      new S3Adapter({ bucket: 'bucket' });
+    }).not.toThrow();
 
     expect(() => {
-      new S3Adapter({}, { params:{ Bucket: 'bucket'}});
-    }).not.toThrow()
+      new S3Adapter({}, { params: { Bucket: 'bucket' } });
+    }).not.toThrow();
   });
 
   it('should accept environment for required', () => {
@@ -57,7 +56,7 @@ describe('S3Adapter tests', () => {
       it('should fail when passed an object without a bucket', () => {
         expect(() => {
           new S3Adapter(config.get('insufficientOptions'));
-        }).toThrow("S3Adapter requires option 'bucket' or env. variable S3_BUCKET")
+        }).toThrow(new Error("S3Adapter requires option 'bucket' or env. variable S3_BUCKET"));
       });
     });
 
@@ -66,19 +65,19 @@ describe('S3Adapter tests', () => {
       it('should accept a string bucket', () => {
         expect(() => {
           new S3Adapter(config.get('bucket'));
-        }).not.toThrow()
+        }).not.toThrow();
       });
 
       it('should accept an object with a bucket', () => {
         expect(() => {
           new S3Adapter(config.get('objectWithBucket'));
-        }).not.toThrow()
+        }).not.toThrow();
       });
 
       it('should accept a second argument of object with a params object with a bucket', () => {
         expect(() => {
           new S3Adapter(config.get('emptyObject'), config.get('paramsObjectWBucket'));
-        }).not.toThrow()
+        }).not.toThrow();
       });
 
       it('should accept environment over default', () => {
@@ -92,31 +91,31 @@ describe('S3Adapter tests', () => {
 
   describe('to find the right arg in the right place', () => {
     it('should accept just bucket as first string arg', () => {
-      var args = ['bucket'];
-      var options = optionsFromArguments(args);
+      const args = ['bucket'];
+      const options = optionsFromArguments(args);
       expect(options.bucket).toEqual('bucket');
     });
 
     it('should accept bucket and options', () => {
-      var confObj = { bucketPrefix: 'test/' };
-      var args = ['bucket', confObj];
-      var options = optionsFromArguments(args);
+      const confObj = { bucketPrefix: 'test/' };
+      const args = ['bucket', confObj];
+      const options = optionsFromArguments(args);
       expect(options.bucket).toEqual('bucket');
       expect(options.bucketPrefix).toEqual('test/');
     });
 
     it('should accept key, secret, and bucket as args', () => {
-      var args = ['key', 'secret', 'bucket'];
-      var options = optionsFromArguments(args);
+      const args = ['key', 'secret', 'bucket'];
+      const options = optionsFromArguments(args);
       expect(options.accessKey).toEqual('key');
       expect(options.secretKey).toEqual('secret');
       expect(options.bucket).toEqual('bucket');
     });
 
     it('should accept key, secret, bucket, and options object as args', () => {
-      var confObj = { bucketPrefix: 'test/' };
-      var args = ['key', 'secret', 'bucket', confObj];
-      var options = optionsFromArguments(args);
+      const confObj = { bucketPrefix: 'test/' };
+      const args = ['key', 'secret', 'bucket', confObj];
+      const options = optionsFromArguments(args);
       expect(options.accessKey).toEqual('key');
       expect(options.secretKey).toEqual('secret');
       expect(options.bucket).toEqual('bucket');
@@ -124,8 +123,10 @@ describe('S3Adapter tests', () => {
     });
 
     it('should accept options and overrides as an option in args', () => {
-      var confObj = { bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1' ,s3overrides: { secretAccessKey: 'secret-2', accessKeyId: 'key-2', params: { Bucket: 'bucket-2' }} };
-      var s3 = new S3Adapter(confObj);
+      const confObj = {
+        bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1', s3overrides: { secretAccessKey: 'secret-2', accessKeyId: 'key-2', params: { Bucket: 'bucket-2' } },
+      };
+      const s3 = new S3Adapter(confObj);
       expect(s3._s3Client.config.accessKeyId).toEqual('key-2');
       expect(s3._s3Client.config.secretAccessKey).toEqual('secret-2');
       expect(s3._s3Client.config.params.Bucket).toEqual('bucket-2');
@@ -133,9 +134,11 @@ describe('S3Adapter tests', () => {
     });
 
     it('should accept options and overrides as args', () => {
-      var confObj = { bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1' };
-      var overridesObj = { secretAccessKey: 'secret-2', accessKeyId: 'key-2', params: { Bucket: 'bucket-2' }};
-      var s3 = new S3Adapter(confObj, overridesObj);
+      const confObj = {
+        bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1',
+      };
+      const overridesObj = { secretAccessKey: 'secret-2', accessKeyId: 'key-2', params: { Bucket: 'bucket-2' } };
+      const s3 = new S3Adapter(confObj, overridesObj);
       expect(s3._s3Client.config.accessKeyId).toEqual('key-2');
       expect(s3._s3Client.config.secretAccessKey).toEqual('secret-2');
       expect(s3._s3Client.config.params.Bucket).toEqual('bucket-2');
@@ -143,9 +146,11 @@ describe('S3Adapter tests', () => {
     });
 
     it('should accept overrides without params', () => {
-      var confObj = { bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1' };
-      var overridesObj = { secretAccessKey: 'secret-2'};
-      var s3 = new S3Adapter(confObj, overridesObj);
+      const confObj = {
+        bucketPrefix: 'test/', bucket: 'bucket-1', secretKey: 'secret-1', accessKey: 'key-1',
+      };
+      const overridesObj = { secretAccessKey: 'secret-2' };
+      const s3 = new S3Adapter(confObj, overridesObj);
       expect(s3._s3Client.config.accessKeyId).toEqual('key-1');
       expect(s3._s3Client.config.secretAccessKey).toEqual('secret-2');
       expect(s3._s3Client.config.params.Bucket).toEqual('bucket-1');
@@ -157,7 +162,7 @@ describe('S3Adapter tests', () => {
     it('should handle range bytes', () => {
       const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket');
       s3._s3Client = {
-        createBucket: callback => callback(),
+        createBucket: (callback) => callback(),
         getObject: (params, callback) => {
           const { Range } = params;
 
@@ -188,7 +193,7 @@ describe('S3Adapter tests', () => {
     it('should handle range bytes error', () => {
       const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket');
       s3._s3Client = {
-        createBucket: callback => callback(),
+        createBucket: (callback) => callback(),
         getObject: (params, callback) => {
           callback('FileNotFound', null);
         },
@@ -213,7 +218,7 @@ describe('S3Adapter tests', () => {
       const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket');
       const data = { Error: 'NoBody' };
       s3._s3Client = {
-        createBucket: callback => callback(),
+        createBucket: (callback) => callback(),
         getObject: (params, callback) => {
           callback(null, data);
         },
@@ -236,52 +241,55 @@ describe('S3Adapter tests', () => {
   });
 
   describe('getFileLocation', () => {
-    var config = {
+    const testConfig = {
       mount: 'http://my.server.com/parse',
-      applicationId: 'xxxx'
+      applicationId: 'xxxx',
     };
-    var options;
+    let options;
 
     beforeEach(() => {
       options = {
         directAccess: true,
-        bucketPrefix:'foo/bar/',
-        baseUrl: 'http://example.com/files'
+        bucketPrefix: 'foo/bar/',
+        baseUrl: 'http://example.com/files',
       };
     });
 
     it('should get using the baseUrl', () => {
-      var s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
-      expect(s3.getFileLocation(config, 'test.png')).toEqual('http://example.com/files/foo/bar/test.png');
+      const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
+      expect(s3.getFileLocation(testConfig, 'test.png')).toEqual('http://example.com/files/foo/bar/test.png');
     });
 
-    it('should get direct to baseUrl', ()=> {
+    it('should get direct to baseUrl', () => {
       options.baseUrlDirect = true;
-      var s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
-      expect(s3.getFileLocation(config, 'test.png')).toEqual('http://example.com/files/test.png');
+      const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
+      expect(s3.getFileLocation(testConfig, 'test.png')).toEqual('http://example.com/files/test.png');
     });
 
     it('should get without directAccess', () => {
       options.directAccess = false;
-      var s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
-      expect(s3.getFileLocation(config, 'test.png')).toEqual('http://my.server.com/parse/files/xxxx/test.png');
+      const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
+      expect(s3.getFileLocation(testConfig, 'test.png')).toEqual('http://my.server.com/parse/files/xxxx/test.png');
     });
 
     it('should go directly to amazon', () => {
       delete options.baseUrl;
-      var s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
-      expect(s3.getFileLocation(config, 'test.png')).toEqual('https://myBucket.s3.amazonaws.com/foo/bar/test.png');
+      const s3 = new S3Adapter('accessKey', 'secretKey', 'myBucket', options);
+      expect(s3.getFileLocation(testConfig, 'test.png')).toEqual('https://myBucket.s3.amazonaws.com/foo/bar/test.png');
     });
   });
 
   let s3;
 
-  if (process.env.TEST_S3_ACCESS_KEY && process.env.TEST_S3_SECRET_KEY && process.env.TEST_S3_BUCKET) {
+  if (
+    process.env.TEST_S3_ACCESS_KEY
+    && process.env.TEST_S3_SECRET_KEY
+    && process.env.TEST_S3_BUCKET) {
     // Should be initialized from the env
     s3 = new S3Adapter({
       accessKey: process.env.TEST_S3_ACCESS_KEY,
       secretKey: process.env.TEST_S3_SECRET_KEY,
-      bucket: process.env.TEST_S3_BUCKET
+      bucket: process.env.TEST_S3_BUCKET,
     });
   } else {
     const bucket = 'FAKE_BUCKET';
@@ -295,53 +303,36 @@ describe('S3Adapter tests', () => {
     const objects = {};
 
     s3._s3Client = {
-      createBucket: callback => setTimeout(callback, 100),
-      upload: (params, callback) => setTimeout(
-        () => {
-          const { Key, Body } = params;
-
-          objects[Key] = Body;
-
-          callback(
-            null,
-            {
-              Location: `https://${bucket}.s3.amazonaws.com/${Key}`
-            }
-          );
-        },
-        100
-      ),
-      deleteObject: (params, callback) => setTimeout(
-        () => {
-          const { Key } = params;
-
-          delete objects[Key];
-
-          callback(null, {});
-        },
-        100
-      ),
-      getObject: (params, callback) => setTimeout(
-        () => {
-          const { Key } = params;
-
-          if (objects[Key]) {
-            callback(
-              null,
-              {
-                Body: Buffer.from(objects[Key], 'utf8')
-              }
-            );
-          } else {
-            callback(
-              new Error('Not found')
-            );
-          }
-        },
-        100
-      )
+      createBucket: (callback) => setTimeout(callback, 100),
+      upload: (params, callback) => setTimeout(() => {
+        const { Key, Body } = params;
+
+        objects[Key] = Body;
+
+        callback(null, {
+          Location: `https://${bucket}.s3.amazonaws.com/${Key}`,
+        });
+      }, 100),
+      deleteObject: (params, callback) => setTimeout(() => {
+        const { Key } = params;
+
+        delete objects[Key];
+
+        callback(null, {});
+      }, 100),
+      getObject: (params, callback) => setTimeout(() => {
+        const { Key } = params;
+
+        if (objects[Key]) {
+          callback(null, {
+            Body: Buffer.from(objects[Key], 'utf8'),
+          });
+        } else {
+          callback(new Error('Not found'));
+        }
+      }, 100),
     };
   }
 
-  filesAdapterTests.testAdapter("S3Adapter", s3);
-})
+  filesAdapterTests.testAdapter('S3Adapter', s3);
+});