diff --git a/.travis.yml b/.travis.yml
index 3524b69..38406e6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,7 @@ node_js:
  - 8 # to be removed 2019-12-31
  - 10 # to be removed 2021-04-31
  - 12 # to be removed 2022-04-31
+ - 14 # to be removed 2023-04-31
  - lts/* # safety net; don't remove
  - node # safety net; don't remove
 
diff --git a/Makefile b/Makefile
index 01d52b9..dfa5794 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,16 @@
 
+NODE_MAJOR_VERSION := $(firstword $(subst ., ,$(shell node --version)))
+
+ifeq ($(NODE_MAJOR_VERSION),v8)
 TESTS = test/*.js
+else ifeq ($(NODE_MAJOR_VERSION),v10)
+TESTS = test/*.js
+else ifeq ($(NODE_MAJOR_VERSION),v12)
+TESTS = test/*.js
+else
+TESTS = test/*.js test/*.mjs
+endif
+
 REPORTER = dot
 
 #
diff --git a/chai.js b/chai.js
index f91d5b8..7a4d77f 100644
--- a/chai.js
+++ b/chai.js
@@ -95,7 +95,7 @@ exports.use(should);
 var assert = require('./chai/interface/assert');
 exports.use(assert);
 
-},{"./chai/assertion":3,"./chai/config":4,"./chai/core/assertions":5,"./chai/interface/assert":6,"./chai/interface/expect":7,"./chai/interface/should":8,"./chai/utils":22,"assertion-error":33}],3:[function(require,module,exports){
+},{"./chai/assertion":3,"./chai/config":4,"./chai/core/assertions":5,"./chai/interface/assert":6,"./chai/interface/expect":7,"./chai/interface/should":8,"./chai/utils":23,"assertion-error":34}],3:[function(require,module,exports){
 /*!
  * chai
  * http://chaijs.com
@@ -236,11 +236,21 @@ module.exports = function (_chai, util) {
     if (!ok) {
       msg = util.getMessage(this, arguments);
       var actual = util.getActual(this, arguments);
-      throw new AssertionError(msg, {
+      var assertionErrorObjectProperties = {
           actual: actual
         , expected: expected
         , showDiff: showDiff
-      }, (config.includeStack) ? this.assert : flag(this, 'ssfi'));
+      };
+
+      var operator = util.getOperator(this, arguments);
+      if (operator) {
+        assertionErrorObjectProperties.operator = operator;
+      }
+
+      throw new AssertionError(
+        msg,
+        assertionErrorObjectProperties,
+        (config.includeStack) ? this.assert : flag(this, 'ssfi'));
     }
   };
 
@@ -894,8 +904,13 @@ module.exports = function (chai, _) {
         // objects with a custom `@@toStringTag`.
         if (val !== Object(val)) {
           throw new AssertionError(
-            flagMsg + 'object tested must be an array, a map, an object,'
-              + ' a set, a string, or a weakset, but ' + objType + ' given',
+            flagMsg + 'the given combination of arguments ('
+            + objType + ' and '
+            + _.type(val).toLowerCase() + ')'
+            + ' is invalid for this assertion. '
+            + 'You can use an array, a map, an object, a set, a string, '
+            + 'or a weakset instead of a '
+            + _.type(val).toLowerCase(),
             undefined,
             ssfi
           );
@@ -3479,6 +3494,14 @@ module.exports = function (chai, _) {
    *     expect(1).to.equal(1); // Recommended
    *     expect(1).to.not.be.oneOf([2, 3, 4]); // Not recommended
    *
+   * It can also be chained with `.contain` or `.include`, which will work with
+   * both arrays and strings:
+   *
+   *     expect('Today is sunny').to.contain.oneOf(['sunny', 'cloudy'])
+   *     expect('Today is rainy').to.not.contain.oneOf(['sunny', 'cloudy'])
+   *     expect([1,2,3]).to.contain.oneOf([3,4,5])
+   *     expect([1,2,3]).to.not.contain.oneOf([4,5,6])
+   *
    * `.oneOf` accepts an optional `msg` argument which is a custom error message
    * to show when the assertion fails. The message can also be given as the
    * second argument to `expect`.
@@ -3497,16 +3520,27 @@ module.exports = function (chai, _) {
     if (msg) flag(this, 'message', msg);
     var expected = flag(this, 'object')
       , flagMsg = flag(this, 'message')
-      , ssfi = flag(this, 'ssfi');
+      , ssfi = flag(this, 'ssfi')
+      , contains = flag(this, 'contains');
     new Assertion(list, flagMsg, ssfi, true).to.be.an('array');
 
-    this.assert(
+    if (contains) {
+      this.assert(
+        list.some(possibility => expected.indexOf(possibility) > -1)
+        , 'expected #{this} to contain one of #{exp}'
+        , 'expected #{this} to not contain one of #{exp}'
+        , list
+        , expected
+      );
+    } else {
+      this.assert(
         list.indexOf(expected) > -1
-      , 'expected #{this} to be one of #{exp}'
-      , 'expected #{this} to not be one of #{exp}'
-      , list
-      , expected
-    );
+        , 'expected #{this} to be one of #{exp}'
+        , 'expected #{this} to not be one of #{exp}'
+        , list
+        , expected
+      );
+    }
   }
 
   Assertion.addMethod('oneOf', oneOf);
@@ -7703,7 +7737,7 @@ module.exports = function addChainableMethod(ctx, name, method, chainingBehavior
   });
 };
 
-},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],10:[function(require,module,exports){
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":31,"./transferFlags":33}],10:[function(require,module,exports){
 var fnLengthDesc = Object.getOwnPropertyDescriptor(function () {}, 'length');
 
 /*!
@@ -7835,7 +7869,7 @@ module.exports = function addMethod(ctx, name, method) {
   ctx[name] = proxify(methodWrapper, name);
 };
 
-},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],12:[function(require,module,exports){
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":31,"./transferFlags":33}],12:[function(require,module,exports){
 /*!
  * Chai - addProperty utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -7909,7 +7943,7 @@ module.exports = function addProperty(ctx, name, getter) {
   });
 };
 
-},{"../../chai":2,"./flag":15,"./isProxyEnabled":25,"./transferFlags":32}],13:[function(require,module,exports){
+},{"../../chai":2,"./flag":15,"./isProxyEnabled":26,"./transferFlags":33}],13:[function(require,module,exports){
 /*!
  * Chai - compareByInspect utility
  * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
@@ -7942,7 +7976,7 @@ module.exports = function compareByInspect(a, b) {
   return inspect(a) < inspect(b) ? -1 : 1;
 };
 
-},{"./inspect":23}],14:[function(require,module,exports){
+},{"./inspect":24}],14:[function(require,module,exports){
 /*!
  * Chai - expectTypes utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -7995,7 +8029,7 @@ module.exports = function expectTypes(obj, types) {
   }
 };
 
-},{"./flag":15,"assertion-error":33,"type-detect":38}],15:[function(require,module,exports){
+},{"./flag":15,"assertion-error":34,"type-detect":39}],15:[function(require,module,exports){
 /*!
  * Chai - flag utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -8132,7 +8166,64 @@ module.exports = function getMessage(obj, args) {
   return flagMsg ? flagMsg + ': ' + msg : msg;
 };
 
-},{"./flag":15,"./getActual":16,"./objDisplay":26}],19:[function(require,module,exports){
+},{"./flag":15,"./getActual":16,"./objDisplay":27}],19:[function(require,module,exports){
+var type = require('type-detect');
+
+var flag = require('./flag');
+
+function isObjectType(obj) {
+  var objectType = type(obj);
+  var objectTypes = ['Array', 'Object', 'function'];
+
+  return objectTypes.indexOf(objectType) !== -1;
+}
+
+/**
+ * ### .getOperator(message)
+ *
+ * Extract the operator from error message.
+ * Operator defined is based on below link
+ * https://nodejs.org/api/assert.html#assert_assert.
+ *
+ * Returns the `operator` or `undefined` value for an Assertion.
+ *
+ * @param {Object} object (constructed Assertion)
+ * @param {Arguments} chai.Assertion.prototype.assert arguments
+ * @namespace Utils
+ * @name getOperator
+ * @api public
+ */
+
+module.exports = function getOperator(obj, args) {
+  var operator = flag(obj, 'operator');
+  var negate = flag(obj, 'negate');
+  var expected = args[3];
+  var msg = negate ? args[2] : args[1];
+
+  if (operator) {
+    return operator;
+  }
+
+  if (typeof msg === 'function') msg = msg();
+
+  msg = msg || '';
+  if (!msg) {
+    return undefined;
+  }
+
+  if (/\shave\s/.test(msg)) {
+    return undefined;
+  }
+
+  var isObject = isObjectType(expected);
+  if (/\snot\s/.test(msg)) {
+    return isObject ? 'notDeepStrictEqual' : 'notStrictEqual';
+  }
+
+  return isObject ? 'deepStrictEqual' : 'strictEqual';
+};
+
+},{"./flag":15,"type-detect":39}],20:[function(require,module,exports){
 /*!
  * Chai - getOwnEnumerableProperties utility
  * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
@@ -8163,7 +8254,7 @@ module.exports = function getOwnEnumerableProperties(obj) {
   return Object.keys(obj).concat(getOwnEnumerablePropertySymbols(obj));
 };
 
-},{"./getOwnEnumerablePropertySymbols":20}],20:[function(require,module,exports){
+},{"./getOwnEnumerablePropertySymbols":21}],21:[function(require,module,exports){
 /*!
  * Chai - getOwnEnumerablePropertySymbols utility
  * Copyright(c) 2011-2016 Jake Luer <jake@alogicalparadox.com>
@@ -8192,7 +8283,7 @@ module.exports = function getOwnEnumerablePropertySymbols(obj) {
   });
 };
 
-},{}],21:[function(require,module,exports){
+},{}],22:[function(require,module,exports){
 /*!
  * Chai - getProperties utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -8230,7 +8321,7 @@ module.exports = function getProperties(object) {
   return result;
 };
 
-},{}],22:[function(require,module,exports){
+},{}],23:[function(require,module,exports){
 /*!
  * chai
  * Copyright(c) 2011 Jake Luer <jake@alogicalparadox.com>
@@ -8404,7 +8495,12 @@ exports.isProxyEnabled = require('./isProxyEnabled');
 
 exports.isNaN = require('./isNaN');
 
-},{"./addChainableMethod":9,"./addLengthGuard":10,"./addMethod":11,"./addProperty":12,"./compareByInspect":13,"./expectTypes":14,"./flag":15,"./getActual":16,"./getMessage":18,"./getOwnEnumerableProperties":19,"./getOwnEnumerablePropertySymbols":20,"./inspect":23,"./isNaN":24,"./isProxyEnabled":25,"./objDisplay":26,"./overwriteChainableMethod":27,"./overwriteMethod":28,"./overwriteProperty":29,"./proxify":30,"./test":31,"./transferFlags":32,"check-error":34,"deep-eql":35,"get-func-name":36,"pathval":37,"type-detect":38}],23:[function(require,module,exports){
+/*!
+ * getOperator method
+ */
+
+exports.getOperator = require('./getOperator');
+},{"./addChainableMethod":9,"./addLengthGuard":10,"./addMethod":11,"./addProperty":12,"./compareByInspect":13,"./expectTypes":14,"./flag":15,"./getActual":16,"./getMessage":18,"./getOperator":19,"./getOwnEnumerableProperties":20,"./getOwnEnumerablePropertySymbols":21,"./inspect":24,"./isNaN":25,"./isProxyEnabled":26,"./objDisplay":27,"./overwriteChainableMethod":28,"./overwriteMethod":29,"./overwriteProperty":30,"./proxify":31,"./test":32,"./transferFlags":33,"check-error":35,"deep-eql":36,"get-func-name":37,"pathval":38,"type-detect":39}],24:[function(require,module,exports){
 // This is (almost) directly from Node.js utils
 // https://github.com/joyent/node/blob/f8c335d0caf47f16d31413f89aa28eda3878e3aa/lib/util.js
 
@@ -8782,7 +8878,7 @@ function objectToString(o) {
   return Object.prototype.toString.call(o);
 }
 
-},{"../config":4,"./getEnumerableProperties":17,"./getProperties":21,"get-func-name":36}],24:[function(require,module,exports){
+},{"../config":4,"./getEnumerableProperties":17,"./getProperties":22,"get-func-name":37}],25:[function(require,module,exports){
 /*!
  * Chai - isNaN utility
  * Copyright(c) 2012-2015 Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
@@ -8810,7 +8906,7 @@ function isNaN(value) {
 // If ECMAScript 6's Number.isNaN is present, prefer that.
 module.exports = Number.isNaN || isNaN;
 
-},{}],25:[function(require,module,exports){
+},{}],26:[function(require,module,exports){
 var config = require('../config');
 
 /*!
@@ -8836,7 +8932,7 @@ module.exports = function isProxyEnabled() {
     typeof Reflect !== 'undefined';
 };
 
-},{"../config":4}],26:[function(require,module,exports){
+},{"../config":4}],27:[function(require,module,exports){
 /*!
  * Chai - flag utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -8888,7 +8984,7 @@ module.exports = function objDisplay(obj) {
   }
 };
 
-},{"../config":4,"./inspect":23}],27:[function(require,module,exports){
+},{"../config":4,"./inspect":24}],28:[function(require,module,exports){
 /*!
  * Chai - overwriteChainableMethod utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -8959,7 +9055,7 @@ module.exports = function overwriteChainableMethod(ctx, name, method, chainingBe
   };
 };
 
-},{"../../chai":2,"./transferFlags":32}],28:[function(require,module,exports){
+},{"../../chai":2,"./transferFlags":33}],29:[function(require,module,exports){
 /*!
  * Chai - overwriteMethod utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -9053,7 +9149,7 @@ module.exports = function overwriteMethod(ctx, name, method) {
   ctx[name] = proxify(overwritingMethodWrapper, name);
 };
 
-},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":30,"./transferFlags":32}],29:[function(require,module,exports){
+},{"../../chai":2,"./addLengthGuard":10,"./flag":15,"./proxify":31,"./transferFlags":33}],30:[function(require,module,exports){
 /*!
  * Chai - overwriteProperty utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -9147,7 +9243,7 @@ module.exports = function overwriteProperty(ctx, name, getter) {
   });
 };
 
-},{"../../chai":2,"./flag":15,"./isProxyEnabled":25,"./transferFlags":32}],30:[function(require,module,exports){
+},{"../../chai":2,"./flag":15,"./isProxyEnabled":26,"./transferFlags":33}],31:[function(require,module,exports){
 var config = require('../config');
 var flag = require('./flag');
 var getProperties = require('./getProperties');
@@ -9296,7 +9392,7 @@ function stringDistanceCapped(strA, strB, cap) {
   return memo[strA.length][strB.length];
 }
 
-},{"../config":4,"./flag":15,"./getProperties":21,"./isProxyEnabled":25}],31:[function(require,module,exports){
+},{"../config":4,"./flag":15,"./getProperties":22,"./isProxyEnabled":26}],32:[function(require,module,exports){
 /*!
  * Chai - test utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -9326,7 +9422,7 @@ module.exports = function test(obj, args) {
   return negate ? !expr : expr;
 };
 
-},{"./flag":15}],32:[function(require,module,exports){
+},{"./flag":15}],33:[function(require,module,exports){
 /*!
  * Chai - transferFlags utility
  * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
@@ -9373,7 +9469,7 @@ module.exports = function transferFlags(assertion, object, includeAll) {
   }
 };
 
-},{}],33:[function(require,module,exports){
+},{}],34:[function(require,module,exports){
 /*!
  * assertion-error
  * Copyright(c) 2013 Jake Luer <jake@qualiancy.com>
@@ -9491,7 +9587,7 @@ AssertionError.prototype.toJSON = function (stack) {
   return props;
 };
 
-},{}],34:[function(require,module,exports){
+},{}],35:[function(require,module,exports){
 'use strict';
 
 /* !
@@ -9665,7 +9761,7 @@ module.exports = {
   getConstructorName: getConstructorName,
 };
 
-},{}],35:[function(require,module,exports){
+},{}],36:[function(require,module,exports){
 'use strict';
 /* globals Symbol: false, Uint8Array: false, WeakMap: false */
 /*!
@@ -10122,7 +10218,7 @@ function isPrimitive(value) {
   return value === null || typeof value !== 'object';
 }
 
-},{"type-detect":38}],36:[function(require,module,exports){
+},{"type-detect":39}],37:[function(require,module,exports){
 'use strict';
 
 /* !
@@ -10168,7 +10264,7 @@ function getFuncName(aFunc) {
 
 module.exports = getFuncName;
 
-},{}],37:[function(require,module,exports){
+},{}],38:[function(require,module,exports){
 'use strict';
 
 /* !
@@ -10461,7 +10557,7 @@ module.exports = {
   setPathValue: setPathValue,
 };
 
-},{}],38:[function(require,module,exports){
+},{}],39:[function(require,module,exports){
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
 	typeof define === 'function' && define.amd ? define(factory) :
diff --git a/index.mjs b/index.mjs
new file mode 100644
index 0000000..fb82439
--- /dev/null
+++ b/index.mjs
@@ -0,0 +1,13 @@
+import chai from './index.js';
+
+export const expect = chai.expect;
+export const version = chai.version;
+export const AssertionError = chai.AssertionError;
+export const util = chai.util;
+export const config = chai.config;
+export const use = chai.use;
+export const should = chai.should;
+export const assert = chai.assert;
+export const core = chai.core;
+
+export default chai;
diff --git a/package-lock.json b/package-lock.json
index 4f95402..71b76eb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -160,7 +160,8 @@
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
       "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "ansi-styles": {
       "version": "2.2.1",
@@ -1060,29 +1061,40 @@
       }
     },
     "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",
-        "wrap-ansi": "^2.0.0"
+        "string-width": "^3.1.0",
+        "strip-ansi": "^5.2.0",
+        "wrap-ansi": "^5.1.0"
       },
       "dependencies": {
         "ansi-regex": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
-          "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
           "dev": true
         },
-        "strip-ansi": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
-          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+        "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": {
-            "ansi-regex": "^3.0.0"
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
           }
         }
       }
@@ -1093,12 +1105,6 @@
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
       "dev": true
     },
-    "code-point-at": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
-      "dev": true
-    },
     "codecov": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.1.0.tgz",
@@ -1347,27 +1353,6 @@
         "sha.js": "^2.4.8"
       }
     },
-    "cross-spawn": {
-      "version": "6.0.5",
-      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-6.0.5.tgz",
-      "integrity": "sha512-eTVLrBSt7fjbDygz805pMnstIs2VTBNkRm0qxZd+M7A5XDdxVRWO5MxGBXZhjY4cqLYLdtrGqRf8mBPmzwSpWQ==",
-      "dev": true,
-      "requires": {
-        "nice-try": "^1.0.4",
-        "path-key": "^2.0.1",
-        "semver": "^5.5.0",
-        "shebang-command": "^1.2.0",
-        "which": "^1.2.9"
-      },
-      "dependencies": {
-        "semver": {
-          "version": "5.7.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
-          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
-          "dev": true
-        }
-      }
-    },
     "cryptiles": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/cryptiles/-/cryptiles-2.0.5.tgz",
@@ -1774,23 +1759,28 @@
       "dev": true
     },
     "es-abstract": {
-      "version": "1.13.0",
-      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
-      "integrity": "sha512-vDZfg/ykNxQVwup/8E1BZhVzFfBxs9NqMzGcvIJrqg5k2/5Za2bWo40dK2J1pgLngZ7c+Shh8lwYtLGyrwPutg==",
+      "version": "1.17.5",
+      "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.17.5.tgz",
+      "integrity": "sha512-BR9auzDbySxOcfog0tLECW8l28eRGpDpU3Dm3Hp4q/N+VtLTmyj4EUN088XZWQDW/hzj6sYRDXeOFsaAODKvpg==",
       "dev": true,
       "requires": {
-        "es-to-primitive": "^1.2.0",
+        "es-to-primitive": "^1.2.1",
         "function-bind": "^1.1.1",
         "has": "^1.0.3",
-        "is-callable": "^1.1.4",
-        "is-regex": "^1.0.4",
-        "object-keys": "^1.0.12"
+        "has-symbols": "^1.0.1",
+        "is-callable": "^1.1.5",
+        "is-regex": "^1.0.5",
+        "object-inspect": "^1.7.0",
+        "object-keys": "^1.1.1",
+        "object.assign": "^4.1.0",
+        "string.prototype.trimleft": "^2.1.1",
+        "string.prototype.trimright": "^2.1.1"
       }
     },
     "es-to-primitive": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.0.tgz",
-      "integrity": "sha512-qZryBOJjV//LaxLTV6UC//WewneB3LcXOL9NP++ozKVXsIIIpm/2c13UDiD9Jp2eThsecw9m3jPqDwTyobcdbg==",
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/es-to-primitive/-/es-to-primitive-1.2.1.tgz",
+      "integrity": "sha512-QCOllgZJtaUo9miYBcLChTUaHNjJF3PYs1VidD7AwiEj1kYxKeQTctLAezAOH5ZKRH0g2IgPn6KwB4IT8iRpvA==",
       "dev": true,
       "requires": {
         "is-callable": "^1.1.4",
@@ -1896,21 +1886,6 @@
         "safe-buffer": "^5.1.1"
       }
     },
-    "execa": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/execa/-/execa-1.0.0.tgz",
-      "integrity": "sha512-adbxcyWV46qiHyvSp50TKt05tB4tK3HcmF7/nxfAdhnox83seTDbwnaqKO4sXRy7roHAIFqJP/Rw/AuEbX61LA==",
-      "dev": true,
-      "requires": {
-        "cross-spawn": "^6.0.0",
-        "get-stream": "^4.0.0",
-        "is-stream": "^1.1.0",
-        "npm-run-path": "^2.0.0",
-        "p-finally": "^1.0.0",
-        "signal-exit": "^3.0.0",
-        "strip-eof": "^1.0.0"
-      }
-    },
     "expand-braces": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/expand-braces/-/expand-braces-0.1.2.tgz",
@@ -2186,9 +2161,9 @@
       },
       "dependencies": {
         "is-buffer": {
-          "version": "2.0.3",
-          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.3.tgz",
-          "integrity": "sha512-U15Q7MXTuZlrbymiz95PJpZxu8IlipAp4dtS3wOdgPXx3mqBnslrWU14kxfHB+Py/+2PVKSr37dMAgM2A4uArw==",
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+          "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A==",
           "dev": true
         }
       }
@@ -2297,7 +2272,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -2712,7 +2688,8 @@
         "safe-buffer": {
           "version": "5.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -2768,6 +2745,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -2811,12 +2789,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
@@ -2903,15 +2883,6 @@
       "resolved": "https://registry.npmjs.org/get-func-name/-/get-func-name-2.0.0.tgz",
       "integrity": "sha1-6td0q+5y4gQJQzoGY2YCPdaIekE="
     },
-    "get-stream": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz",
-      "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==",
-      "dev": true,
-      "requires": {
-        "pump": "^3.0.0"
-      }
-    },
     "get-uri": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/get-uri/-/get-uri-2.0.2.tgz",
@@ -3083,9 +3054,9 @@
       "dev": true
     },
     "has-symbols": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.0.tgz",
-      "integrity": "sha1-uhqPGvKg/DllD1yFA2dwQSIGO0Q=",
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.1.tgz",
+      "integrity": "sha512-PLcsoqu++dmEIZB+6totNFKq/7Do+Z0u4oT0zKOJNl3lYK6vGwwu2hjHs+68OEZbTjiUE9bgOABXbP/GvrS0Kg==",
       "dev": true
     },
     "has-value": {
@@ -3185,7 +3156,8 @@
       "version": "2.16.3",
       "resolved": "https://registry.npmjs.org/hoek/-/hoek-2.16.3.tgz",
       "integrity": "sha1-ILt0A9POo5jpHcRxCo/xuCdKJe0=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "htmlescape": {
       "version": "1.1.1",
@@ -3381,12 +3353,6 @@
         "xtend": "^4.0.0"
       }
     },
-    "invert-kv": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-2.0.0.tgz",
-      "integrity": "sha512-wPVv/y/QQ/Uiirj/vh3oP+1Ww+AWehmi1g5fFWGPF6IpCBCDVrhgHRMvrLfdYcwDh3QJbGXDW4JAuzxElLSqKA==",
-      "dev": true
-    },
     "ip": {
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/ip/-/ip-1.1.5.tgz",
@@ -3430,9 +3396,9 @@
       "dev": true
     },
     "is-callable": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.4.tgz",
-      "integrity": "sha512-r5p9sxJjYnArLjObpjA4xu5EKI3CuKHkJXMhT7kwbpUyIFD1n5PMAsoPvWnvtZiNz7LjkYDRZhd7FlI0eMijEA==",
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/is-callable/-/is-callable-1.1.5.tgz",
+      "integrity": "sha512-ESKv5sMCJB2jnHTWZ3O5itG+O128Hsus4K4Qh1h2/cgn2vbgnLSVqfV46AeJA9D5EeeLa9w81KUXMtn34zhX+Q==",
       "dev": true
     },
     "is-data-descriptor": {
@@ -3456,9 +3422,9 @@
       }
     },
     "is-date-object": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.1.tgz",
-      "integrity": "sha1-mqIOtq7rv/d/vTPnTKAbM1gdOhY=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/is-date-object/-/is-date-object-1.0.2.tgz",
+      "integrity": "sha512-USlDT524woQ08aoZFzh3/Z6ch9Y/EWXEHQ/AaRN0SkKq4t2Jw2R2339tSXmwuVoY7LLlBCbOIlx2myP/L5zk0g==",
       "dev": true
     },
     "is-descriptor": {
@@ -3565,27 +3531,28 @@
       "optional": true
     },
     "is-regex": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.4.tgz",
-      "integrity": "sha1-VRdIm1RwkbCTDglWVM7SXul+lJE=",
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/is-regex/-/is-regex-1.0.5.tgz",
+      "integrity": "sha512-vlKW17SNq44owv5AQR3Cq0bQPEb8+kF3UKZ2fiZNOWtztYE5i0CzCZxFDwO58qAOWtxdBRVO/V5Qin1wjCqFYQ==",
       "dev": true,
       "requires": {
-        "has": "^1.0.1"
+        "has": "^1.0.3"
       }
     },
     "is-stream": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/is-stream/-/is-stream-1.1.0.tgz",
       "integrity": "sha1-EtSj3U5o4Lec6428hBc66A2RykQ=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "is-symbol": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.2.tgz",
-      "integrity": "sha512-HS8bZ9ox60yCJLH9snBpIwv9pYUAkcuLhSA1oero1UB5y9aiQpRA8y2ex945AOtCZL1lJDeIk3G5LthswI46Lw==",
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/is-symbol/-/is-symbol-1.0.3.tgz",
+      "integrity": "sha512-OwijhaRSgqvhm/0ZdAcXNZt9lYdKFpcRDT5ULUuYXPoT794UNOdU+gpT6Rzo7b4V2HUl/op6GqY894AZwv9faQ==",
       "dev": true,
       "requires": {
-        "has-symbols": "^1.0.0"
+        "has-symbols": "^1.0.1"
       }
     },
     "is-typedarray": {
@@ -3871,15 +3838,6 @@
         "readable-stream": "^2.0.5"
       }
     },
-    "lcid": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/lcid/-/lcid-2.0.0.tgz",
-      "integrity": "sha512-avPEb8P8EGnwXKClwsNUgryVjllcRqtMYa49NTsbQagYuT1DcXnl1915oxWjoyGrXR6zH/Y0Zc96xWsPcoDKeA==",
-      "dev": true,
-      "requires": {
-        "invert-kv": "^2.0.0"
-      }
-    },
     "levn": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/levn/-/levn-0.3.0.tgz",
@@ -3894,7 +3852,8 @@
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/libbase64/-/libbase64-0.1.0.tgz",
       "integrity": "sha1-YjUag5VjrF/1vSbxL2Dpgwu3UeY=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "libmime": {
       "version": "3.0.0",
@@ -3921,7 +3880,8 @@
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/libqp/-/libqp-1.1.0.tgz",
       "integrity": "sha1-9ebgatdLeU+1tbZpiL9yjvHe2+g=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "locate-path": {
       "version": "3.0.0",
@@ -3952,12 +3912,12 @@
       "dev": true
     },
     "log-symbols": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-2.2.0.tgz",
-      "integrity": "sha512-VeIAFslyIerEJLXHziedo2basKbMKtTw3vfn5IzG0XTjhAVEJyNHnL2p7vc+wBDSdQuUpNw3M2u6xb9QsAY5Eg==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/log-symbols/-/log-symbols-3.0.0.tgz",
+      "integrity": "sha512-dSkNGuI7iG3mfvDzUuYZyvk5dD9ocYCYzNU6CYDE6+Xqd+gwme6Z00NS3dUh8mq/73HaEtT7m6W+yUPtU6BZnQ==",
       "dev": true,
       "requires": {
-        "chalk": "^2.0.1"
+        "chalk": "^2.4.2"
       },
       "dependencies": {
         "ansi-styles": {
@@ -4243,15 +4203,6 @@
         }
       }
     },
-    "map-age-cleaner": {
-      "version": "0.1.3",
-      "resolved": "https://registry.npmjs.org/map-age-cleaner/-/map-age-cleaner-0.1.3.tgz",
-      "integrity": "sha512-bJzx6nMoP6PDLPBFmg7+xRKeFZvFboMrGlxmNj9ClvX53KrmvM5bXFXEWjbz4cz1AFn+jWJ9z/DJSz7hrs0w3w==",
-      "dev": true,
-      "requires": {
-        "p-defer": "^1.0.0"
-      }
-    },
     "map-cache": {
       "version": "0.2.2",
       "resolved": "https://registry.npmjs.org/map-cache/-/map-cache-0.2.2.tgz",
@@ -4284,17 +4235,6 @@
       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g=",
       "dev": true
     },
-    "mem": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/mem/-/mem-4.3.0.tgz",
-      "integrity": "sha512-qX2bG48pTqYRVmDB37rn/6PT7LcR8T7oAX3bf99u1Tt1nzxYfxkgqDwUwolPlXweM0XzBOBFzSx4kfp7KP1s/w==",
-      "dev": true,
-      "requires": {
-        "map-age-cleaner": "^0.1.1",
-        "mimic-fn": "^2.0.0",
-        "p-is-promise": "^2.0.0"
-      }
-    },
     "micromatch": {
       "version": "3.1.10",
       "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-3.1.10.tgz",
@@ -4347,12 +4287,6 @@
         "mime-db": "~1.36.0"
       }
     },
-    "mimic-fn": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/mimic-fn/-/mimic-fn-2.1.0.tgz",
-      "integrity": "sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==",
-      "dev": true
-    },
     "minimalistic-assert": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/minimalistic-assert/-/minimalistic-assert-1.0.1.tgz",
@@ -4419,13 +4353,14 @@
       }
     },
     "mocha": {
-      "version": "6.1.4",
-      "resolved": "https://registry.npmjs.org/mocha/-/mocha-6.1.4.tgz",
-      "integrity": "sha512-PN8CIy4RXsIoxoFJzS4QNnCH4psUCPWc4/rPrst/ecSJJbLBkubMiyGCP2Kj/9YnWbotFqAoeXyXMucj7gwCFg==",
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-7.1.2.tgz",
+      "integrity": "sha512-o96kdRKMKI3E8U0bjnfqW4QMk12MwZ4mhdBTf+B5a1q9+aq2HRnj+3ZdJu0B/ZhJeK78MgYuv6L8d/rA5AeBJA==",
       "dev": true,
       "requires": {
         "ansi-colors": "3.2.3",
         "browser-stdout": "1.3.1",
+        "chokidar": "3.3.0",
         "debug": "3.2.6",
         "diff": "3.5.0",
         "escape-string-regexp": "1.0.5",
@@ -4434,21 +4369,62 @@
         "growl": "1.10.5",
         "he": "1.2.0",
         "js-yaml": "3.13.1",
-        "log-symbols": "2.2.0",
+        "log-symbols": "3.0.0",
         "minimatch": "3.0.4",
-        "mkdirp": "0.5.1",
+        "mkdirp": "0.5.5",
         "ms": "2.1.1",
-        "node-environment-flags": "1.0.5",
+        "node-environment-flags": "1.0.6",
         "object.assign": "4.1.0",
         "strip-json-comments": "2.0.1",
         "supports-color": "6.0.0",
         "which": "1.3.1",
         "wide-align": "1.1.3",
-        "yargs": "13.2.2",
-        "yargs-parser": "13.0.0",
-        "yargs-unparser": "1.5.0"
+        "yargs": "13.3.2",
+        "yargs-parser": "13.1.2",
+        "yargs-unparser": "1.6.0"
       },
       "dependencies": {
+        "anymatch": {
+          "version": "3.1.1",
+          "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+          "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+          "dev": true,
+          "requires": {
+            "normalize-path": "^3.0.0",
+            "picomatch": "^2.0.4"
+          }
+        },
+        "binary-extensions": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
+          "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+          "dev": true
+        },
+        "braces": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+          "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+          "dev": true,
+          "requires": {
+            "fill-range": "^7.0.1"
+          }
+        },
+        "chokidar": {
+          "version": "3.3.0",
+          "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
+          "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
+          "dev": true,
+          "requires": {
+            "anymatch": "~3.1.1",
+            "braces": "~3.0.2",
+            "fsevents": "~2.1.1",
+            "glob-parent": "~5.1.0",
+            "is-binary-path": "~2.1.0",
+            "is-glob": "~4.0.1",
+            "normalize-path": "~3.0.0",
+            "readdirp": "~3.2.0"
+          }
+        },
         "debug": {
           "version": "3.2.6",
           "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
@@ -4458,12 +4434,61 @@
             "ms": "^2.1.1"
           }
         },
+        "fill-range": {
+          "version": "7.0.1",
+          "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
+          "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+          "dev": true,
+          "requires": {
+            "to-regex-range": "^5.0.1"
+          }
+        },
+        "fsevents": {
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.1.3.tgz",
+          "integrity": "sha512-Auw9a4AxqWpa9GUfj370BMPzzyncfBABW8Mab7BGWBYDj4Isgq+cDKtx0i6u9jcX9pQDnswsaaOTgTmA5pEjuQ==",
+          "dev": true,
+          "optional": true
+        },
+        "glob-parent": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-5.1.1.tgz",
+          "integrity": "sha512-FnI+VGOpnlGHWZxthPGR+QhR78fuiK0sNLkHQv+bL9fQi57lNNdquIbna/WrfROrolq8GK5Ek6BiMwqL/voRYQ==",
+          "dev": true,
+          "requires": {
+            "is-glob": "^4.0.1"
+          }
+        },
         "has-flag": {
           "version": "3.0.0",
           "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
           "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
           "dev": true
         },
+        "is-binary-path": {
+          "version": "2.1.0",
+          "resolved": "https://registry.npmjs.org/is-binary-path/-/is-binary-path-2.1.0.tgz",
+          "integrity": "sha512-ZMERYes6pDydyuGidse7OsHxtbI7WVeUEozgR/g7rd0xUimYNlvZRE/K2MgZTjWy725IfelLeVcEM97mmtRGXw==",
+          "dev": true,
+          "requires": {
+            "binary-extensions": "^2.0.0"
+          }
+        },
+        "is-glob": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.1.tgz",
+          "integrity": "sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==",
+          "dev": true,
+          "requires": {
+            "is-extglob": "^2.1.1"
+          }
+        },
+        "is-number": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
+          "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
+          "dev": true
+        },
         "js-yaml": {
           "version": "3.13.1",
           "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.13.1.tgz",
@@ -4474,12 +4499,42 @@
             "esprima": "^4.0.0"
           }
         },
+        "minimist": {
+          "version": "1.2.5",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+          "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
+          "dev": true
+        },
+        "mkdirp": {
+          "version": "0.5.5",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.5.tgz",
+          "integrity": "sha512-NKmAlESf6jMGym1++R0Ra7wvhV+wFW63FaSOFPwRahvea0gMUcGUhVeAg/0BC0wiv9ih5NYPB1Wn1UEI1/L+xQ==",
+          "dev": true,
+          "requires": {
+            "minimist": "^1.2.5"
+          }
+        },
         "ms": {
           "version": "2.1.1",
           "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
           "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
           "dev": true
         },
+        "normalize-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/normalize-path/-/normalize-path-3.0.0.tgz",
+          "integrity": "sha512-6eZs5Ls3WtCisHWp9S2GUy8dqkpGi4BVSz3GaqiE6ezub0512ESztXUwUB6C6IKbQkY2Pnb/mD4WYojCRwcwLA==",
+          "dev": true
+        },
+        "readdirp": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.2.0.tgz",
+          "integrity": "sha512-crk4Qu3pmXwgxdSgGhgA/eXiJAPQiX4GMOZZMXnqKxHX7TaoL+3gQVo/WeuAiogr07DpnfjIMpXXa+PAIvwPGQ==",
+          "dev": true,
+          "requires": {
+            "picomatch": "^2.0.4"
+          }
+        },
         "supports-color": {
           "version": "6.0.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.0.0.tgz",
@@ -4488,6 +4543,15 @@
           "requires": {
             "has-flag": "^3.0.0"
           }
+        },
+        "to-regex-range": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+          "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
+          "dev": true,
+          "requires": {
+            "is-number": "^7.0.0"
+          }
         }
       }
     },
@@ -4559,16 +4623,10 @@
       "dev": true,
       "optional": true
     },
-    "nice-try": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/nice-try/-/nice-try-1.0.5.tgz",
-      "integrity": "sha512-1nh45deeb5olNY7eX82BkPO7SSxR5SSYJiPTrTdFUVYwAl8CKMA5N9PjTYkHiRjisVcxcQ1HXdLhx2qxxJzLNQ==",
-      "dev": true
-    },
     "node-environment-flags": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/node-environment-flags/-/node-environment-flags-1.0.5.tgz",
-      "integrity": "sha512-VNYPRfGfmZLx0Ye20jWzHUjyTW/c+6Wq+iLhDzUI4XmhrDd9l/FozXV3F2xOaXjvp0co0+v1YSR3CMP6g+VvLQ==",
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/node-environment-flags/-/node-environment-flags-1.0.6.tgz",
+      "integrity": "sha512-5Evy2epuL+6TM0lCQGpFIj6KwiEsGh1SrHUhTbNX+sLbBtjidPZFAnVK9y5yU1+h//RitLbRHTIMyxQPtxMdHw==",
       "dev": true,
       "requires": {
         "object.getownpropertydescriptors": "^2.0.3",
@@ -4576,9 +4634,9 @@
       },
       "dependencies": {
         "semver": {
-          "version": "5.7.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
-          "integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
+          "version": "5.7.1",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+          "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
           "dev": true
         }
       }
@@ -4634,13 +4692,15 @@
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/nodemailer-fetch/-/nodemailer-fetch-1.6.0.tgz",
       "integrity": "sha1-ecSQihwPXzdbc/6IjamCj23JY6Q=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "nodemailer-shared": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/nodemailer-shared/-/nodemailer-shared-1.1.0.tgz",
       "integrity": "sha1-z1mU4v0mjQD1zw+nZ6CBae2wfsA=",
       "dev": true,
+      "optional": true,
       "requires": {
         "nodemailer-fetch": "1.6.0"
       }
@@ -4694,27 +4754,12 @@
         "remove-trailing-separator": "^1.0.1"
       }
     },
-    "npm-run-path": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/npm-run-path/-/npm-run-path-2.0.2.tgz",
-      "integrity": "sha1-NakjLfo11wZ7TLLd8jV7GHFTbF8=",
-      "dev": true,
-      "requires": {
-        "path-key": "^2.0.0"
-      }
-    },
     "null-check": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/null-check/-/null-check-1.0.0.tgz",
       "integrity": "sha1-l33/1xdgErnsMNKjnbXPcqBDnt0=",
       "dev": true
     },
-    "number-is-nan": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
-      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
-      "dev": true
-    },
     "oauth-sign": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
@@ -4758,6 +4803,12 @@
         }
       }
     },
+    "object-inspect": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.7.0.tgz",
+      "integrity": "sha512-a7pEHdh1xKIAgTySUGgLMx/xwDZskN1Ud6egYYN3EdRW4ZMPNEDUTF+hwy2LUC+Bl+SyLXANnwz/jyh/qutKUw==",
+      "dev": true
+    },
     "object-keys": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.1.1.tgz",
@@ -4786,13 +4837,13 @@
       }
     },
     "object.getownpropertydescriptors": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.0.3.tgz",
-      "integrity": "sha1-h1jIRvW0B62rDyNuCYbxSwUcqhY=",
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/object.getownpropertydescriptors/-/object.getownpropertydescriptors-2.1.0.tgz",
+      "integrity": "sha512-Z53Oah9A3TdLoblT7VKJaTDdXdT+lQO+cNpKVnya5JDe9uLvzu1YyY1yFDFrcxrlRgWrEFH0jJtD/IbuwjcEVg==",
       "dev": true,
       "requires": {
-        "define-properties": "^1.1.2",
-        "es-abstract": "^1.5.1"
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.0-next.1"
       }
     },
     "object.pick": {
@@ -4866,45 +4917,16 @@
       "integrity": "sha1-hUNzx/XCMVkU/Jv8a9gjj92h7Cc=",
       "dev": true
     },
-    "os-locale": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-3.1.0.tgz",
-      "integrity": "sha512-Z8l3R4wYWM40/52Z+S265okfFj8Kt2cC2MKY+xNi3kFs+XGI7WXu/I309QQQYbRW4ijiZ+yxs9pqEhJh0DqW3Q==",
-      "dev": true,
-      "requires": {
-        "execa": "^1.0.0",
-        "lcid": "^2.0.0",
-        "mem": "^4.0.0"
-      }
-    },
     "os-tmpdir": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
       "integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
       "dev": true
     },
-    "p-defer": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-defer/-/p-defer-1.0.0.tgz",
-      "integrity": "sha1-n26xgvbJqozXQwBKfU+WsZaw+ww=",
-      "dev": true
-    },
-    "p-finally": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
-      "integrity": "sha1-P7z7FbiZpEEjs0ttzBi3JDNqLK4=",
-      "dev": true
-    },
-    "p-is-promise": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/p-is-promise/-/p-is-promise-2.1.0.tgz",
-      "integrity": "sha512-Y3W0wlRPK8ZMRbNq97l4M5otioeA5lm1z7bkNkxCka8HSPjR0xRWmpCmc9utiaLP9Jb1eD8BgeIxTW4AIF45Pg==",
-      "dev": true
-    },
     "p-limit": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.0.tgz",
-      "integrity": "sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
       "dev": true,
       "requires": {
         "p-try": "^2.0.0"
@@ -5057,12 +5079,6 @@
       "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
       "dev": true
     },
-    "path-key": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/path-key/-/path-key-2.0.1.tgz",
-      "integrity": "sha1-QRyttXTFoUDTpLGRDUDYDMn0C0A=",
-      "dev": true
-    },
     "path-parse": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.6.tgz",
@@ -5118,6 +5134,12 @@
       "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
       "dev": true
     },
+    "picomatch": {
+      "version": "2.2.2",
+      "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-2.2.2.tgz",
+      "integrity": "sha512-q0M/9eZHzmr0AulXyPwNfZjtwZ/RBZlbN3K3CErVrk50T2ASYI7Bye0EvekFY3IP1Nt2DHu0re+V2ZHIpMkuWg==",
+      "dev": true
+    },
     "pinkie": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/pinkie/-/pinkie-2.0.4.tgz",
@@ -5239,16 +5261,6 @@
         "safe-buffer": "^5.1.2"
       }
     },
-    "pump": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
-      "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
-      "dev": true,
-      "requires": {
-        "end-of-stream": "^1.1.0",
-        "once": "^1.3.1"
-      }
-    },
     "punycode": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
@@ -5625,21 +5637,6 @@
         "sha.js": "~2.4.4"
       }
     },
-    "shebang-command": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
-      "integrity": "sha1-RKrGW2lbAzmJaMOfNj/uXer98eo=",
-      "dev": true,
-      "requires": {
-        "shebang-regex": "^1.0.0"
-      }
-    },
-    "shebang-regex": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
-      "integrity": "sha1-2kL0l0DAtC2yypcoVxyxkMmO/qM=",
-      "dev": true
-    },
     "shell-quote": {
       "version": "1.6.1",
       "resolved": "https://registry.npmjs.org/shell-quote/-/shell-quote-1.6.1.tgz",
@@ -5652,12 +5649,6 @@
         "jsonify": "~0.0.0"
       }
     },
-    "signal-exit": {
-      "version": "3.0.2",
-      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
-      "integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
-      "dev": true
-    },
     "simple-concat": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.0.tgz",
@@ -6083,6 +6074,48 @@
         }
       }
     },
+    "string.prototype.trimend": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimend/-/string.prototype.trimend-1.0.1.tgz",
+      "integrity": "sha512-LRPxFUaTtpqYsTeNKaFOw3R4bxIzWOnbQ837QfBylo8jIxtcbK/A/sMV7Q+OAV/vWo+7s25pOE10KYSjaSO06g==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5"
+      }
+    },
+    "string.prototype.trimleft": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimleft/-/string.prototype.trimleft-2.1.2.tgz",
+      "integrity": "sha512-gCA0tza1JBvqr3bfAIFJGqfdRTyPae82+KTnm3coDXkZN9wnuW3HjGgN386D7hfv5CHQYCI022/rJPVlqXyHSw==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5",
+        "string.prototype.trimstart": "^1.0.0"
+      }
+    },
+    "string.prototype.trimright": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimright/-/string.prototype.trimright-2.1.2.tgz",
+      "integrity": "sha512-ZNRQ7sY3KroTaYjRS6EbNiiHrOkjihL9aQE/8gfQ4DtAC/aEBRHFJa44OmoWxGGqXuJlfKkZW4WcXErGr+9ZFg==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5",
+        "string.prototype.trimend": "^1.0.0"
+      }
+    },
+    "string.prototype.trimstart": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.trimstart/-/string.prototype.trimstart-1.0.1.tgz",
+      "integrity": "sha512-XxZn+QpvrBI1FOcg6dIpxUPgWCPuNXvMD72aaRaUQv1eD4e/Qy8i/hFTe0BUmD60p/QA6bh1avmuPTfNjqVWRw==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.17.5"
+      }
+    },
     "string_decoder": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
@@ -6103,16 +6136,11 @@
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
       "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
       "dev": true,
+      "optional": true,
       "requires": {
         "ansi-regex": "^2.0.0"
       }
     },
-    "strip-eof": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/strip-eof/-/strip-eof-1.0.0.tgz",
-      "integrity": "sha1-u0P/VZim6wXYm1n80SnJgzE2Br8=",
-      "dev": true
-    },
     "strip-json-comments": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
@@ -6787,33 +6815,49 @@
       "dev": true
     },
     "wrap-ansi": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
-      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz",
+      "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==",
       "dev": true,
       "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1"
+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
       },
       "dependencies": {
-        "is-fullwidth-code-point": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
-          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+        "ansi-regex": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
+          "integrity": "sha512-1apePfXM1UOSqw0o9IiFAovVz9M5S1Dg+4TrDwfMewQ6p/rmMueb7tWZjQ1rx4Loy1ArBggoqGpfqqdI4rondg==",
+          "dev": true
+        },
+        "ansi-styles": {
+          "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": {
-            "number-is-nan": "^1.0.0"
+            "color-convert": "^1.9.0"
           }
         },
         "string-width": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "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": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+          "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
           }
         }
       }
@@ -6868,22 +6912,21 @@
       "optional": true
     },
     "yargs": {
-      "version": "13.2.2",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.2.tgz",
-      "integrity": "sha512-WyEoxgyTD3w5XRpAQNYUB9ycVH/PQrToaTXdYXRdOXvEy1l19br+VJsc0vcO8PTGg5ro/l/GY7F/JMEBmI0BxA==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
       "requires": {
-        "cliui": "^4.0.0",
+        "cliui": "^5.0.0",
         "find-up": "^3.0.0",
         "get-caller-file": "^2.0.1",
-        "os-locale": "^3.1.0",
         "require-directory": "^2.1.1",
         "require-main-filename": "^2.0.0",
         "set-blocking": "^2.0.0",
         "string-width": "^3.0.0",
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.0.0"
+        "yargs-parser": "^13.1.2"
       },
       "dependencies": {
         "ansi-regex": {
@@ -6915,9 +6958,9 @@
       }
     },
     "yargs-parser": {
-      "version": "13.0.0",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.0.0.tgz",
-      "integrity": "sha512-w2LXjoL8oRdRQN+hOyppuXs+V/fVAYtpcrRxZuF7Kt/Oc+Jr2uAcVntaUTNT6w5ihoWfFDpNY8CPx1QskxZ/pw==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
@@ -6925,57 +6968,21 @@
       }
     },
     "yargs-unparser": {
-      "version": "1.5.0",
-      "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"
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
       },
       "dependencies": {
-        "get-caller-file": {
-          "version": "1.0.3",
-          "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
-          "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+        "lodash": {
+          "version": "4.17.15",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
+          "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==",
           "dev": true
-        },
-        "require-main-filename": {
-          "version": "1.0.1",
-          "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
-          "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
-          "dev": true
-        },
-        "yargs": {
-          "version": "12.0.5",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
-          "integrity": "sha512-Lhz8TLaYnxq/2ObqHDql8dX8CJi97oHxrjUcYtzKbbykPtVW9WB+poxI+NM2UIzsMgNCZTIf0AQwsjK5yMAqZw==",
-          "dev": true,
-          "requires": {
-            "cliui": "^4.0.0",
-            "decamelize": "^1.2.0",
-            "find-up": "^3.0.0",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^3.0.0",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^1.0.1",
-            "set-blocking": "^2.0.0",
-            "string-width": "^2.0.0",
-            "which-module": "^2.0.0",
-            "y18n": "^3.2.1 || ^4.0.0",
-            "yargs-parser": "^11.1.1"
-          }
-        },
-        "yargs-parser": {
-          "version": "11.1.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
-          "integrity": "sha512-C6kB/WJDiaxONLJQnF8ccx9SEeoTTLek8RVbaOIsrAUS8VrBEXfmeSnCZxygc+XC2sNMBIwOOnfcxiynjHsVSQ==",
-          "dev": true,
-          "requires": {
-            "camelcase": "^5.0.0",
-            "decamelize": "^1.2.0"
-          }
         }
       }
     },
diff --git a/package.json b/package.json
index f85a4c4..fc11ec0 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,13 @@
     "url": "https://github.com/chaijs/chai/issues"
   },
   "main": "./index",
+  "exports": {
+    ".": {
+      "require": "./index.js",
+      "import": "./index.mjs"
+    },
+    "./": "./"
+  },
   "scripts": {
     "test": "make test"
   },
@@ -50,6 +57,6 @@
     "karma-firefox-launcher": "^1.0.0",
     "karma-mocha": "^1.0.1",
     "karma-sauce-launcher": "^1.2.0",
-    "mocha": "^6.1.4"
+    "mocha": "^7.1.2"
   }
 }
diff --git a/test/esm.mjs b/test/esm.mjs
new file mode 100644
index 0000000..fc4838c
--- /dev/null
+++ b/test/esm.mjs
@@ -0,0 +1,11 @@
+import {expect, should} from 'chai';
+import chai from 'chai';
+import 'chai/register-assert.js';
+should()
+
+it('expect and should are ESM named exports and chai is a default export', () => {
+  expect(4).to.equal(4);
+  "s".should.equal("s");
+  chai.expect(4).to.equal(4);
+  assert.equal(4, 4);
+})
\ No newline at end of file