diff --git a/.travis.yml b/.travis.yml
index b12f785..ef2a8c2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,12 @@
- language: node_js
- node_js:
-   - 8
-   - 10
-   - 12
- branches:
- only:
-  - master
- notifications:
+language: node_js
+node_js:
+  - "8"
+  - "10"
+  - "12"
+branches:
+  only:
+    - master
+notifications:
   email:
-   - joaquim.serafim@gmail.com
- script: npm test
+    - joaquim.serafim@gmail.com
+script: npm test
diff --git a/bench.js b/bench.js
index e247dd2..6386ae8 100644
--- a/bench.js
+++ b/bench.js
@@ -43,7 +43,7 @@ new Benchmark.Suite()
   .on('complete', () => {
     console.log('benchmark finish')
   })
-  .run({ 'async': true })
+  .run({ async: true })
 
 //
 //
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..0b59b44
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,20 @@
+//
+// methods
+//
+
+export function encode(
+  key: string,
+  data: any,
+  algorithm: string,
+  cb: (err?: Error, token?: string) => any
+): any;
+
+export function decode(
+  key: string,
+  token: string,
+  cb: (err?: Error, token?: string) => any
+): any;
+
+export function getAlgorithms(): string[];
+
+export function JWTError(message: string): Error;
diff --git a/index.js b/index.js
index 5d96d26..bdaa29c 100644
--- a/index.js
+++ b/index.js
@@ -41,13 +41,12 @@ function encode (key, data, algorithm, cb) {
 
   var defaultHeader = { typ: 'JWT', alg: algorithm }
 
-  var payload = isObject(data) && data.payload
-    ? data.payload
-    : data
+  var payload = isObject(data) && data.payload ? data.payload : data
 
-  var header = isObject(data) && data.header
-    ? extend(data.header, defaultHeader)
-    : defaultHeader
+  var header =
+    isObject(data) && data.header
+      ? extend(data.header, defaultHeader)
+      : defaultHeader
 
   const validationError = encodeValidations(key, payload, algorithm)
 
@@ -55,7 +54,8 @@ function encode (key, data, algorithm, cb) {
     return prcResult(validationError, null, cb)
   }
 
-  const parts = b64url.encode(JSON.stringify(header)) +
+  const parts =
+    b64url.encode(JSON.stringify(header)) +
     '.' +
     b64url.encode(JSON.stringify(payload))
 
@@ -75,11 +75,7 @@ function decode (key, token, cb) {
 
   // check all parts're present
   if (parts.length !== 3) {
-    return prcResult(
-      'The JWT should consist of three parts!',
-      null,
-      cb
-    )
+    return prcResult('The JWT should consist of three parts!', null, cb)
   }
 
   // base64 decode and parse JSON
@@ -94,12 +90,7 @@ function decode (key, token, cb) {
   }
 
   // verify the signature
-  const res = verify(
-    algorithm,
-    key,
-    parts.slice(0, 2).join('.'),
-    parts[2]
-  )
+  const res = verify(algorithm, key, parts.slice(0, 2).join('.'), parts[2])
 
   return prcResult((!res && 'Invalid key!') || null, payload, header, cb)
 }
@@ -131,18 +122,25 @@ inherits(JWTError, Error)
 
 function sign (alg, key, input) {
   return alg.type === 'hmac'
-    ? b64url.escape(crypto.createHmac(alg.hash, key)
-      .update(input)
-      .digest('base64'))
-    : b64url.escape(crypto.createSign(alg.hash)
-      .update(input)
-      .sign(key, 'base64'))
+    ? b64url.escape(
+      crypto
+        .createHmac(alg.hash, key)
+        .update(input)
+        .digest('base64')
+    )
+    : b64url.escape(
+      crypto
+        .createSign(alg.hash)
+        .update(input)
+        .sign(key, 'base64')
+    )
 }
 
 function verify (alg, key, input, signVar) {
   return alg.type === 'hmac'
     ? signVar === sign(alg, key, input)
-    : crypto.createVerify(alg.hash)
+    : crypto
+      .createVerify(alg.hash)
       .update(input)
       .verify(key, b64url.unescape(signVar), 'base64')
 }
@@ -157,10 +155,9 @@ function prcResult (err, payload, header, cb) {
 
   return cb
     ? cb(err, payload, header)
-    : (header
+    : header
       ? { error: err, value: payload, header: header }
       : { error: err, value: payload }
-    )
 }
 
 function isFunction (param) {
diff --git a/package-lock.json b/package-lock.json
index e90eb0d..109663b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,29 +1,28 @@
 {
   "name": "json-web-token",
-  "version": "3.0.1",
+  "version": "3.1.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
-      "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==",
+      "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/generator": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.4.4.tgz",
-      "integrity": "sha512-53UOLK6TVNqKxf7RUh8NE851EHRxOOeVXKbK2bivdb+iziMyk03Sr4eaE9OELCbyZAAafAKPDwF2TPUES5QbxQ==",
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.6.2.tgz",
+      "integrity": "sha512-j8iHaIW4gGPnViaIHI7e9t/Hl8qLjERI6DcV9kEpAIDJsAOrcnXqRS7t+QbhL76pwbtqP+QCQLL0z1CyVmtjjQ==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.4.4",
+        "@babel/types": "^7.6.0",
         "jsesc": "^2.5.1",
-        "lodash": "^4.17.11",
-        "source-map": "^0.5.0",
-        "trim-right": "^1.0.1"
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
       },
       "dependencies": {
         "source-map": {
@@ -64,9 +63,9 @@
       }
     },
     "@babel/highlight": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
-      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "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",
@@ -75,37 +74,37 @@
       }
     },
     "@babel/parser": {
-      "version": "7.4.5",
-      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.4.5.tgz",
-      "integrity": "sha512-9mUqkL1FF5T7f0WDFfAoDdiMVPWsdD1gZYzSnaXsxUCUqzuch/8of9G3VUSNiZmMBoRxT3neyVsqeiL/ZPcjew==",
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.6.2.tgz",
+      "integrity": "sha512-mdFqWrSPCmikBoaBYMuBulzTIKuXVPtEISFbRRVNwMWpCms/hmE2kRq0bblUHaNRKrjRlmVbx1sDHmjmRgD2Xg==",
       "dev": true
     },
     "@babel/template": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.4.4.tgz",
-      "integrity": "sha512-CiGzLN9KgAvgZsnivND7rkA+AeJ9JB0ciPOD4U59GKbQP2iQl+olF1l76kJOupqidozfZ32ghwBEJDhnk9MEcw==",
+      "version": "7.6.0",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.6.0.tgz",
+      "integrity": "sha512-5AEH2EXD8euCk446b7edmgFdub/qfH1SN6Nii3+fyXP807QRx9Q73A2N5hNwRRslC2H9sNzaFhsPubkS4L8oNQ==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/parser": "^7.4.4",
-        "@babel/types": "^7.4.4"
+        "@babel/parser": "^7.6.0",
+        "@babel/types": "^7.6.0"
       }
     },
     "@babel/traverse": {
-      "version": "7.4.5",
-      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.4.5.tgz",
-      "integrity": "sha512-Vc+qjynwkjRmIFGxy0KYoPj4FdVDxLej89kMHFsWScq999uX+pwcX4v9mWRjW0KcAYTPAuVQl2LKP1wEVLsp+A==",
+      "version": "7.6.2",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.6.2.tgz",
+      "integrity": "sha512-8fRE76xNwNttVEF2TwxJDGBLWthUkHWSldmfuBzVRmEDWOtu4XdINTgN7TDWzuLg4bbeIMLvfMFD9we5YcWkRQ==",
       "dev": true,
       "requires": {
-        "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.4.4",
+        "@babel/code-frame": "^7.5.5",
+        "@babel/generator": "^7.6.2",
         "@babel/helper-function-name": "^7.1.0",
         "@babel/helper-split-export-declaration": "^7.4.4",
-        "@babel/parser": "^7.4.5",
-        "@babel/types": "^7.4.4",
+        "@babel/parser": "^7.6.2",
+        "@babel/types": "^7.6.0",
         "debug": "^4.1.0",
         "globals": "^11.1.0",
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.13"
       },
       "dependencies": {
         "debug": {
@@ -120,13 +119,13 @@
       }
     },
     "@babel/types": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.4.4.tgz",
-      "integrity": "sha512-dOllgYdnEFOebhkKCjzSVFqw/PmmB8pH6RGOWkY4GsboQNd47b1fBThBSwlHAq9alF9vc1M3+6oqR47R50L0tQ==",
+      "version": "7.6.1",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.6.1.tgz",
+      "integrity": "sha512-X7gdiuaCmA0uRjCmRtYJNAVCc/q+5xSgsfKJHqMN4iNLILX39677fJE1O40arPMh0TTtS9ItH67yre6c7k6t0g==",
       "dev": true,
       "requires": {
         "esutils": "^2.0.2",
-        "lodash": "^4.17.11",
+        "lodash": "^4.17.13",
         "to-fast-properties": "^2.0.0"
       }
     },
@@ -137,21 +136,21 @@
       "dev": true
     },
     "acorn": {
-      "version": "6.1.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
-      "integrity": "sha512-jPTiwtOxaHNaAPg/dmrJ/beuzLRnXtB0kQPQ8JpotKJgTB6rX6c8mlf315941pyjBSaPg8NHXS9fhP4u17DpGA==",
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
+      "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
       "dev": true
     },
     "acorn-jsx": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
-      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "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": "6.10.0",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.10.0.tgz",
-      "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
+      "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",
@@ -160,12 +159,6 @@
         "uri-js": "^4.2.2"
       }
     },
-    "ajv-keywords": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.4.0.tgz",
-      "integrity": "sha512-aUjdRFISbuFOl0EIZc+9e4FfZp0bDZgAdOOf30bJmw8VM9v84SHyVyxDfbWxpGYbdZD/9XoKxfHVNmxPkhwyGw==",
-      "dev": true
-    },
     "amdefine": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
@@ -249,6 +242,12 @@
       "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",
@@ -273,65 +272,6 @@
       "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": {
-        "ansi-regex": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-          "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
-        },
-        "chalk": {
-          "version": "1.1.3",
-          "resolved": "https://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"
-          }
-        },
-        "js-tokens": {
-          "version": "3.0.2",
-          "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-3.0.2.tgz",
-          "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
-          "dev": true
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "dev": true,
-          "requires": {
-            "ansi-regex": "^2.0.0"
-          }
-        },
-        "supports-color": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
-          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
-          "dev": true
-        }
-      }
-    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
@@ -339,9 +279,9 @@
       "dev": true
     },
     "base64-url": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/base64-url/-/base64-url-2.2.1.tgz",
-      "integrity": "sha512-RWaW1M7+pLUikK1bnGyiDe1oY2BKOtbS30Ua1pSAH41st59qDxi/XiggjVhHVPIejXY1eqJ21W3uxHtZpM6KQw=="
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/base64-url/-/base64-url-2.3.2.tgz",
+      "integrity": "sha512-2QpXjtjndKqPn9JKBpMTCbDGpgicfLUu+N5Y1vEfbuyqb1MN1D68C9YKCth4SjTHRvJleF3tPuxhLbH79MM0iQ=="
     },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
@@ -386,19 +326,10 @@
         "write-file-atomic": "^2.4.2"
       }
     },
-    "caller-path": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
-      "integrity": "sha1-lAhe9jWB7NPaqSREqP6U6CV3dR8=",
-      "dev": true,
-      "requires": {
-        "callsites": "^0.2.0"
-      }
-    },
     "callsites": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/callsites/-/callsites-0.2.0.tgz",
-      "integrity": "sha1-r6uWJikQp/M8GaV3WCXGnzTjUMo=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
+      "integrity": "sha512-P8BjAsXvZS+VIDUI11hHCQEv74YT67YUi5JJFNWIqL235sBmjX4+qx9Muvls5ivyNENctx46xQLQ3aTuE7ssaQ==",
       "dev": true
     },
     "camelcase": {
@@ -442,15 +373,9 @@
       }
     },
     "chardet": {
-      "version": "0.4.2",
-      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.4.2.tgz",
-      "integrity": "sha1-tUc7M9yXxCTl2Y3IfVXU2KKci/I=",
-      "dev": true
-    },
-    "circular-json": {
-      "version": "0.3.3",
-      "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",
-      "integrity": "sha512-UZK3NBx2Mca+b5LsG7bY183pHWt5Y1xts4P3Pz7ENTwGVnJOUWbRb3ocjvX7hx9tq/yTAdclXm9sZ38gNuem4A==",
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
       "dev": true
     },
     "cli-cursor": {
@@ -469,22 +394,44 @@
       "dev": true
     },
     "cliui": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-4.1.0.tgz",
-      "integrity": "sha512-4FG+RSG9DL7uEwRUZXZn3SS34DiDPfzP0VOiEwtUWlE+AR2EIg+hSyvrIgUUfhdgR/UkAeW2QHgeP+hWrXs7jQ==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-5.0.0.tgz",
+      "integrity": "sha512-PYeGSEmmHM6zvoef2w8TPzlrnNpXIjTipYK780YswmIP9vjxmd6Y2a3CB2Ks6/AU8NHjZugXvo8w3oWM2qnwXA==",
       "dev": true,
       "requires": {
-        "string-width": "^2.1.1",
-        "strip-ansi": "^4.0.0",
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-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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           "dev": true,
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-            "ansi-regex": "^2.0.0"
+            "ansi-regex": "^4.1.0"
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@@ -3588,9 +3565,9 @@
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-      "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",
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@@ -3608,9 +3585,9 @@
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-      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
-      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
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@@ -3625,22 +3602,21 @@
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-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
-      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
+      "version": "13.3.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
+      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
       "dev": true,
       "requires": {
-        "cliui": "^4.0.0",
+        "cliui": "^5.0.0",
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-        "os-locale": "^3.1.0",
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         "string-width": "^3.0.0",
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         "y18n": "^4.0.0",
-        "yargs-parser": "^13.0.0"
+        "yargs-parser": "^13.1.1"
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@@ -3672,9 +3648,9 @@
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-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
-      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+      "version": "13.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
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       "dev": true,
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@@ -3682,58 +3658,14 @@
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-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.5.0.tgz",
-      "integrity": "sha512-HK25qidFTCVuj/D1VfNiEndpLIeJN78aqgR23nL3y4N0U/91cOAzqfHlF8n2BvoNDcZmJKin3ddNSvOxSr8flw==",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
       "dev": true,
       "requires": {
         "flat": "^4.1.0",
-        "lodash": "^4.17.11",
-        "yargs": "^12.0.5"
-      },
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-          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
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-          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
-          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
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-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
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-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
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+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
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diff --git a/package.json b/package.json
index cc6a1c0..a15fd70 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "3.1.1",
   "description": "JSON Web Token (JWT) is a compact token format intended for space constrained environments such as HTTP Authorization headers and URI query parameters.",
   "main": "index.js",
+  "types": "index.d.ts",
   "scripts": {
     "coverage:open": "open coverage/index.html",
     "coverage": "nyc report --reporter=text-lcov | coveralls",
@@ -13,7 +14,8 @@
   "files": [
     "LICENSE",
     "README.md",
-    "index.js"
+    "index.js",
+    "index.d.ts"
   ],
   "repository": {
     "type": "git",
@@ -34,18 +36,18 @@
   },
   "homepage": "https://github.com/joaquimserafim/json-web-token",
   "dependencies": {
-    "base64-url": "^2.2.1",
+    "base64-url": "^2.3.2",
     "is.object": "^1.0.0",
-    "json-parse-safe": "^1.0.5",
-    "xtend": "^4.0.1"
+    "json-parse-safe": "^2.0.0",
+    "xtend": "^4.0.2"
   },
   "devDependencies": {
-    "coveralls": "^3.0.3",
+    "coveralls": "^3.0.6",
     "istanbul": "0.4.5",
-    "mocha": "^6.1.4",
+    "mocha": "^6.2.1",
     "nyc": "^14.1.1",
     "pre-commit": "^1.2.2",
-    "standard": "^12.0.1"
+    "standard": "^14.3.1"
   },
   "nyc": {
     "include": [