diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..c8c503f
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,8 @@
+version: 2
+updates:
+- package-ecosystem: npm
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "13:00"
+  open-pull-requests-limit: 10
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..a838888
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,22 @@
+name: Test
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm ci
+      - run: npm test
diff --git a/.gitignore b/.gitignore
index be2ee44..76b1021 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
-artifacts/
-coverage/
-node_modules/
+.nyc_output
+coverage
+node_modules
diff --git a/.npmignore b/.npmignore
index c22b205..eb37f27 100644
--- a/.npmignore
+++ b/.npmignore
@@ -4,3 +4,6 @@ test/
 .gitignore
 .npmignore
 .travis.yml
+.nyc_output
+.vscode
+.github
diff --git a/.travis.yml b/.travis.yml
index 61e4237..ac233c3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,4 @@
 language: node_js
 node_js:
-    - "0.10"
-    - "0.12"
-    - "4"
-    - "5"
-    - "6"
+    - "10"
+    - "12"
diff --git a/README.md b/README.md
index 9c0081b..3d03c2e 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 Serialize JavaScript
 ====================
 
-Serialize JavaScript to a _superset_ of JSON that includes regular expressions and functions.
+Serialize JavaScript to a _superset_ of JSON that includes regular expressions, dates and functions.
 
 [![npm Version][npm-badge]][npm]
 [![Dependency Status][david-badge]][david]
@@ -11,9 +11,13 @@ Serialize JavaScript to a _superset_ of JSON that includes regular expressions a
 
 The code in this package began its life as an internal module to [express-state][]. To expand its usefulness, it now lives as `serialize-javascript` — an independent package on npm.
 
-You're probably wondering: **What about `JSON.stringify()`!?** We've found that sometimes we need to serialize JavaScript **functions** and **regexps**. A great example is a web app that uses client-side URL routing where the route definitions are regexps that need to be shared from the server to the client.
+You're probably wondering: **What about `JSON.stringify()`!?** We've found that sometimes we need to serialize JavaScript **functions**, **regexps**, **dates**, **sets** or **maps**. A great example is a web app that uses client-side URL routing where the route definitions are regexps that need to be shared from the server to the client. But this module is also great for communicating between node processes.
 
-The string returned from this package's single export function is literal JavaScript which can be saved to a `.js` file, or be embedded into an HTML document by making the content of a `<script>` element. **HTML charaters and JavaScript line terminators are escaped automatically.**
+The string returned from this package's single export function is literal JavaScript which can be saved to a `.js` file, or be embedded into an HTML document by making the content of a `<script>` element.
+
+> **HTML characters and JavaScript line terminators are escaped automatically.**
+
+Please note that serialization for ES6 Sets & Maps requires support for `Array.from` (not available in IE or Node < 0.12), or an `Array.from` polyfill.
 
 ## Installation
 
@@ -36,16 +40,20 @@ serialize({
     bool : true,
     nil  : null,
     undef: undefined,
-
-    fn: function echo(arg) { return arg; },
-    re: /([^\s]+)/g
+    inf  : Infinity,
+    date : new Date("Thu, 28 Apr 2016 22:02:17 GMT"),
+    map  : new Map([['hello', 'world']]),
+    set  : new Set([123, 456]),
+    fn   : function echo(arg) { return arg; },
+    re   : /([^\s]+)/g,
+    big  : BigInt(10),
 });
 ```
 
 The above will produce the following string output:
 
 ```js
-'{"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"fn":function echo(arg) { return arg; },"re":/([^\\s]+)/g}'
+'{"str":"string","num":0,"obj":{"foo":"foo"},"arr":[1,2,3],"bool":true,"nil":null,"undef":undefined,"inf":Infinity,"date":new Date("2016-04-28T22:02:17.000Z"),"map":new Map([["hello","world"]]),"set":new Set([123,456]),"fn":function echo(arg) { return arg; },"re":new RegExp("([^\\\\s]+)", "g"),"big":BigInt("10")}'
 ```
 
 Note: to produced a beautified string, you can pass an optional second argument to `serialize()` to define the number of spaces to be used for the indentation.
@@ -66,9 +74,11 @@ The above will produce the following string, HTML-escaped output which is safe t
 '{"haxorXSS":"\\u003C\\u002Fscript\\u003E"}'
 ```
 
+> You can pass an optional `unsafe` argument to `serialize()` for straight serialization.
+
 ### Options
 
-The `serialize()` function accepts `options` as its second argument. There are two options, both default to being `undefined`:
+The `serialize()` function accepts an `options` object as its second argument. All options are being defaulted to `undefined`:
 
 #### `options.space`
 
@@ -88,17 +98,26 @@ This option is a signal to `serialize()` that the object being serialized does n
 serialize(obj, {isJSON: true});
 ```
 
-## Deserializing
+#### `options.unsafe`
+
+This option is to signal `serialize()` that we want to do a straight conversion, without the XSS protection. This options needs to be explicitly set to `true`. HTML characters and JavaScript line terminators will not be escaped. You will have to roll your own.
 
-For some use cases you might also need to deserialize the string. This is explicitely not part of this module. However, you can easily write it yourself:
+```js
+serialize(obj, {unsafe: true});
+```
+
+#### `options.ignoreFunction`
+
+This option is to signal `serialize()` that we do not want serialize JavaScript function. 
+Just treat function like `JSON.stringify` do, but other features will work as expected.
 
 ```js
-function deserialize(serializedJavascript){
-  return eval('(' + serializedJavascript + ')');
-}
+serialize(obj, {ignoreFunction: true});
 ```
 
-**Note:** Don't forget the parentheses around the serialized javascript, as the opening bracket `{` will be considered to be the start of a body.
+## Deserializing
+
+For some use cases you might also need to deserialize the string. Modern browsers support using [JSON.parse](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse) to deserialize JSON, which protects against malicious scripts being executed through malformed JSON.
 
 ## License
 
diff --git a/index.js b/index.js
index 0f4c3d3..640db8f 100644
--- a/index.js
+++ b/index.js
@@ -6,15 +6,20 @@ See the accompanying LICENSE file for terms.
 
 'use strict';
 
-var isRegExp = require('util').isRegExp;
+var randomBytes = require('randombytes');
 
 // Generate an internal UID to make the regexp pattern harder to guess.
-var UID                 = Math.floor(Math.random() * 0x10000000000).toString(16);
-var PLACE_HOLDER_REGEXP = new RegExp('"@__(F|R)-' + UID + '-(\\d+)__@"', 'g');
+var UID_LENGTH          = 16;
+var UID                 = generateUID();
+var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|A|U|I|B)-' + UID + '-(\\d+)__@"', 'g');
 
 var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
+var IS_PURE_FUNCTION = /function.*?\(/;
+var IS_ARROW_FUNCTION = /.*?=>.*?/;
 var UNSAFE_CHARS_REGEXP   = /[<>\/\u2028\u2029]/g;
 
+var RESERVED_SYMBOLS = ['*', 'async'];
+
 // Mapping of unsafe HTML and invalid JavaScript line terminator chars to their
 // Unicode char counterparts which are safe to use in JavaScript strings.
 var ESCAPED_CHARS = {
@@ -29,41 +34,154 @@ function escapeUnsafeChars(unsafeChar) {
     return ESCAPED_CHARS[unsafeChar];
 }
 
+function generateUID() {
+    var bytes = randomBytes(UID_LENGTH);
+    var result = '';
+    for(var i=0; i<UID_LENGTH; ++i) {
+        result += bytes[i].toString(16);
+    }
+    return result;
+}
+
+function deleteFunctions(obj){
+    var functionKeys = [];
+    for (var key in obj) {
+        if (typeof obj[key] === "function") {
+            functionKeys.push(key);
+        }
+    }
+    for (var i = 0; i < functionKeys.length; i++) {
+        delete obj[functionKeys[i]];
+    }
+}
+
 module.exports = function serialize(obj, options) {
     options || (options = {});
 
-    // Backwards-compatability for `space` as the second argument.
+    // Backwards-compatibility for `space` as the second argument.
     if (typeof options === 'number' || typeof options === 'string') {
         options = {space: options};
     }
 
     var functions = [];
     var regexps   = [];
+    var dates     = [];
+    var maps      = [];
+    var sets      = [];
+    var arrays    = [];
+    var undefs    = [];
+    var infinities= [];
+    var bigInts = [];
 
     // Returns placeholders for functions and regexps (identified by index)
     // which are later replaced by their string representation.
     function replacer(key, value) {
-        if (!value) {
+
+        // For nested function
+        if(options.ignoreFunction){
+            deleteFunctions(value);
+        }
+
+        if (!value && value !== undefined) {
             return value;
         }
 
-        var type = typeof value;
+        // If the value is an object w/ a toJSON method, toJSON is called before
+        // the replacer runs, so we use this[key] to get the non-toJSONed value.
+        var origValue = this[key];
+        var type = typeof origValue;
 
         if (type === 'object') {
-            if (isRegExp(value)) {
-                return '@__R-' + UID + '-' + (regexps.push(value) - 1) + '__@';
+            if(origValue instanceof RegExp) {
+                return '@__R-' + UID + '-' + (regexps.push(origValue) - 1) + '__@';
             }
 
-            return value;
+            if(origValue instanceof Date) {
+                return '@__D-' + UID + '-' + (dates.push(origValue) - 1) + '__@';
+            }
+
+            if(origValue instanceof Map) {
+                return '@__M-' + UID + '-' + (maps.push(origValue) - 1) + '__@';
+            }
+
+            if(origValue instanceof Set) {
+                return '@__S-' + UID + '-' + (sets.push(origValue) - 1) + '__@';
+            }
+
+            if(origValue instanceof Array) {
+                var isSparse = origValue.filter(function(){return true}).length !== origValue.length;
+                if (isSparse) {
+                    return '@__A-' + UID + '-' + (arrays.push(origValue) - 1) + '__@';
+                }
+            }
         }
 
         if (type === 'function') {
-            return '@__F-' + UID + '-' + (functions.push(value) - 1) + '__@';
+            return '@__F-' + UID + '-' + (functions.push(origValue) - 1) + '__@';
+        }
+
+        if (type === 'undefined') {
+            return '@__U-' + UID + '-' + (undefs.push(origValue) - 1) + '__@';
+        }
+
+        if (type === 'number' && !isNaN(origValue) && !isFinite(origValue)) {
+            return '@__I-' + UID + '-' + (infinities.push(origValue) - 1) + '__@';
+        }
+
+        if (type === 'bigint') {
+            return '@__B-' + UID + '-' + (bigInts.push(origValue) - 1) + '__@';
         }
 
         return value;
     }
 
+    function serializeFunc(fn) {
+      var serializedFn = fn.toString();
+      if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
+          throw new TypeError('Serializing native function: ' + fn.name);
+      }
+
+      // pure functions, example: {key: function() {}}
+      if(IS_PURE_FUNCTION.test(serializedFn)) {
+          return serializedFn;
+      }
+
+      // arrow functions, example: arg1 => arg1+5
+      if(IS_ARROW_FUNCTION.test(serializedFn)) {
+          return serializedFn;
+      }
+
+      var argsStartsAt = serializedFn.indexOf('(');
+      var def = serializedFn.substr(0, argsStartsAt)
+        .trim()
+        .split(' ')
+        .filter(function(val) { return val.length > 0 });
+
+      var nonReservedSymbols = def.filter(function(val) {
+        return RESERVED_SYMBOLS.indexOf(val) === -1
+      });
+
+      // enhanced literal objects, example: {key() {}}
+      if(nonReservedSymbols.length > 0) {
+          return (def.indexOf('async') > -1 ? 'async ' : '') + 'function'
+            + (def.join('').indexOf('*') > -1 ? '*' : '')
+            + serializedFn.substr(argsStartsAt);
+      }
+
+      // arrow functions
+      return serializedFn;
+    }
+
+    // Check if the parameter is function
+    if (options.ignoreFunction && typeof obj === "function") {
+        obj = undefined;
+    }
+    // Protects against `JSON.stringify()` returning `undefined`, by serializing
+    // to the literal string: "undefined".
+    if (obj === undefined) {
+        return String(obj);
+    }
+
     var str;
 
     // Creates a JSON string representation of the value.
@@ -83,27 +201,59 @@ module.exports = function serialize(obj, options) {
     // Replace unsafe HTML and invalid JavaScript line terminator chars with
     // their safe Unicode char counterpart. This _must_ happen before the
     // regexps and functions are serialized and added back to the string.
-    str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
+    if (options.unsafe !== true) {
+        str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
+    }
 
-    if (functions.length === 0 && regexps.length === 0) {
+    if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0 && arrays.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0) {
         return str;
     }
 
-    // Replaces all occurrences of function and regexp placeholders in the JSON
-    // string with their string representations. If the original value can not
-    // be found, then `undefined` is used.
-    return str.replace(PLACE_HOLDER_REGEXP, function (match, type, valueIndex) {
+    // Replaces all occurrences of function, regexp, date, map and set placeholders in the
+    // JSON string with their string representations. If the original value can
+    // not be found, then `undefined` is used.
+    return str.replace(PLACE_HOLDER_REGEXP, function (match, backSlash, type, valueIndex) {
+        // The placeholder may not be preceded by a backslash. This is to prevent
+        // replacing things like `"a\"@__R-<UID>-0__@"` and thus outputting
+        // invalid JS.
+        if (backSlash) {
+            return match;
+        }
+
+        if (type === 'D') {
+            return "new Date(\"" + dates[valueIndex].toISOString() + "\")";
+        }
+
         if (type === 'R') {
-            return regexps[valueIndex].toString();
+            return "new RegExp(" + serialize(regexps[valueIndex].source) + ", \"" + regexps[valueIndex].flags + "\")";
         }
 
-        var fn           = functions[valueIndex];
-        var serializedFn = fn.toString();
+        if (type === 'M') {
+            return "new Map(" + serialize(Array.from(maps[valueIndex].entries()), options) + ")";
+        }
 
-        if (IS_NATIVE_CODE_REGEXP.test(serializedFn)) {
-            throw new TypeError('Serializing native function: ' + fn.name);
+        if (type === 'S') {
+            return "new Set(" + serialize(Array.from(sets[valueIndex].values()), options) + ")";
         }
 
-        return serializedFn;
+        if (type === 'A') {
+            return "Array.prototype.slice.call(" + serialize(Object.assign({ length: arrays[valueIndex].length }, arrays[valueIndex]), options) + ")";
+        }
+
+        if (type === 'U') {
+            return 'undefined'
+        }
+
+        if (type === 'I') {
+            return infinities[valueIndex];
+        }
+
+        if (type === 'B') {
+            return "BigInt(\"" + bigInts[valueIndex] + "\")";
+        }
+
+        var fn = functions[valueIndex];
+
+        return serializeFunc(fn);
     });
 }
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..8e12a18
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2397 @@
+{
+  "name": "serialize-javascript",
+  "version": "5.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.10.1.tgz",
+      "integrity": "sha512-IGhtTmpjGbYzcEDOw7DcQtbQSXcG9ftmAXtWTu9V936vDye4xjjekktFAtgZsWpzTj/X01jocB46mTywm/4SZw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.1"
+      }
+    },
+    "@babel/core": {
+      "version": "7.10.2",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.10.2.tgz",
+      "integrity": "sha512-KQmV9yguEjQsXqyOUGKjS4+3K8/DlOCE2pZcq4augdQmtTy5iv5EHtmMSJ7V4c1BIPjuwtZYqYLCq9Ga+hGBRQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.1",
+        "@babel/generator": "^7.10.2",
+        "@babel/helper-module-transforms": "^7.10.1",
+        "@babel/helpers": "^7.10.1",
+        "@babel/parser": "^7.10.2",
+        "@babel/template": "^7.10.1",
+        "@babel/traverse": "^7.10.1",
+        "@babel/types": "^7.10.2",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.1",
+        "json5": "^2.1.2",
+        "lodash": "^4.17.13",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        }
+      }
+    },
+    "@babel/generator": {
+      "version": "7.10.2",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.10.2.tgz",
+      "integrity": "sha512-AxfBNHNu99DTMvlUPlt1h2+Hn7knPpH5ayJ8OqDWSeLld+Fi2AYBTC/IejWDM9Edcii4UzZRCsbUt0WlSDsDsA==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.2",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.13",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.10.1.tgz",
+      "integrity": "sha512-fcpumwhs3YyZ/ttd5Rz0xn0TpIwVkN7X0V38B9TWNfVF42KEkhkAAuPCQ3oXmtTRtiPJrmZ0TrfS0GKF0eMaRQ==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.10.1",
+        "@babel/template": "^7.10.1",
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.1.tgz",
+      "integrity": "sha512-F5qdXkYGOQUb0hpRaPoetF9AnsXknKjWMZ+wmsIRsp5ge5sFh4c3h1eH2pRTTuy9KKAA2+TTYomGXAtEL2fQEw==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-member-expression-to-functions": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.10.1.tgz",
+      "integrity": "sha512-u7XLXeM2n50gb6PWJ9hoO5oO7JFPaZtrh35t8RqKLT1jFKj9IWeD1zrcrYp1q1qiZTdEarfDWfTIP8nGsu0h5g==",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-module-imports": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.10.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-module-transforms": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.10.1.tgz",
+      "integrity": "sha512-RLHRCAzyJe7Q7sF4oy2cB+kRnU4wDZY/H2xJFGof+M+SJEGhZsb+GFj5j1AD8NiSaVBJ+Pf0/WObiXu/zxWpFg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-module-imports": "^7.10.1",
+        "@babel/helper-replace-supers": "^7.10.1",
+        "@babel/helper-simple-access": "^7.10.1",
+        "@babel/helper-split-export-declaration": "^7.10.1",
+        "@babel/template": "^7.10.1",
+        "@babel/types": "^7.10.1",
+        "lodash": "^4.17.13"
+      }
+    },
+    "@babel/helper-optimise-call-expression": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-optimise-call-expression/-/helper-optimise-call-expression-7.10.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-replace-supers": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.10.1.tgz",
+      "integrity": "sha512-SOwJzEfpuQwInzzQJGjGaiG578UYmyi2Xw668klPWV5n07B73S0a9btjLk/52Mlcxa+5AdIYqws1KyXRfMoB7A==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-member-expression-to-functions": "^7.10.1",
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+        "ansi-styles": "^3.2.0",
+        "string-width": "^3.0.0",
+        "strip-ansi": "^5.0.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
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+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-4.1.0.tgz",
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+          "dev": true
+        },
+        "string-width": {
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+          "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"
+          }
+        },
+        "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"
+          }
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
+      "dev": true
+    },
+    "yargs": {
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+      "dev": true,
+      "requires": {
+        "cliui": "^5.0.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^2.0.1",
+        "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": "^13.1.2"
+      },
+      "dependencies": {
+        "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
+        },
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "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"
+          }
+        },
+        "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"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "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",
+        "decamelize": "^1.2.0"
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
+      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.3.1",
+        "decamelize": "^1.2.0",
+        "flat": "^4.1.0",
+        "is-plain-obj": "^1.1.0",
+        "yargs": "^14.2.3"
+      },
+      "dependencies": {
+        "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
+        },
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "path-exists": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
+          "integrity": "sha1-zg6+ql94yxiSXqfYENe1mwEP1RU=",
+          "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"
+          }
+        },
+        "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"
+          }
+        },
+        "yargs": {
+          "version": "14.2.3",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
+          "dev": true,
+          "requires": {
+            "cliui": "^5.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^2.0.1",
+            "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": "^15.0.1"
+          }
+        },
+        "yargs-parser": {
+          "version": "15.0.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
+          "dev": true,
+          "requires": {
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index f8950e1..b6446e5 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,11 @@
 {
   "name": "serialize-javascript",
-  "version": "1.3.0",
+  "version": "5.0.1",
   "description": "Serialize JavaScript to a superset of JSON that includes regular expressions and functions.",
   "main": "index.js",
   "scripts": {
     "benchmark": "node -v && node test/benchmark/serialize.js",
-    "test": "istanbul cover -- ./node_modules/mocha/bin/_mocha test/unit/ --reporter spec"
+    "test": "nyc --reporter=lcov mocha test/unit"
   },
   "repository": {
     "type": "git",
@@ -25,10 +25,12 @@
   },
   "homepage": "https://github.com/yahoo/serialize-javascript",
   "devDependencies": {
-    "benchmark": "^1.0.0",
-    "chai": "^1.9.1",
-    "istanbul": "^0.3.2",
-    "mocha": "^1.21.4",
-    "xunit-file": "0.0.5"
+    "benchmark": "^2.1.4",
+    "chai": "^4.1.0",
+    "mocha": "^8.0.1",
+    "nyc": "^15.0.0"
+  },
+  "dependencies": {
+    "randombytes": "^2.1.0"
   }
 }
diff --git a/test/benchmark/serialize.js b/test/benchmark/serialize.js
index aa98fcb..6f6b738 100644
--- a/test/benchmark/serialize.js
+++ b/test/benchmark/serialize.js
@@ -39,6 +39,12 @@ new Benchmark.Suite('simpleObj', suiteConfig)
     .add('serialize( simpleObj, {isJSON: true} )', function () {
         serialize(simpleObj, {isJSON: true});
     })
+    .add('serialize( simpleObj, {unsafe: true} )', function () {
+        serialize(simpleObj, {unsafe: true});
+    })
+    .add('serialize( simpleObj, {unsafe: true, isJSON: true} )', function () {
+        serialize(simpleObj, {unsafe: true, isJSON: true});
+    })
     .add('serialize( simpleObj )', function () {
         serialize(simpleObj);
     })
diff --git a/test/unit/serialize.js b/test/unit/serialize.js
index 882351e..bd24070 100644
--- a/test/unit/serialize.js
+++ b/test/unit/serialize.js
@@ -1,9 +1,23 @@
 /* global describe, it, beforeEach */
 'use strict';
 
+// temporarily monkeypatch `crypto.randomBytes` so we'll have a
+// predictable UID for our tests
+var crypto = require('crypto');
+var oldRandom = crypto.randomBytes;
+crypto.randomBytes = function(len, cb) {
+    var buf = Buffer.alloc(len);
+    buf.fill(0x00);
+    if (cb)
+        cb(null, buf);
+    return buf;
+};
+
 var serialize = require('../../'),
     expect    = require('chai').expect;
 
+crypto.randomBytes = oldRandom;
+
 describe('serialize( obj )', function () {
     it('should be a function', function () {
         expect(serialize).to.be.a('function');
@@ -57,6 +71,13 @@ describe('serialize( obj )', function () {
             var ws = String.fromCharCode(8232);
             expect(eval(serialize(ws))).to.equal(ws);
         });
+
+        it('should serialize undefined correctly', function () {
+            var obj;
+            var str = '{"undef":undefined,"nest":{"undef":undefined}}';
+            eval('obj = ' + str);
+            expect(serialize(obj)).to.equal(str);
+        });
     });
 
     describe('functions', function () {
@@ -109,12 +130,142 @@ describe('serialize( obj )', function () {
             try { serialize(Number); } catch (e) { err = e; }
             expect(err).to.be.an.instanceOf(TypeError);
         });
+
+        it('should serialize enhanced literal objects', function () {
+            var obj = {
+                foo() { return true; },
+                *bar() { return true; }
+            };
+
+            expect(serialize(obj)).to.equal('{"foo":function() { return true; },"bar":function*() { return true; }}');
+        });
+
+        it('should deserialize enhanced literal objects', function () {
+            var obj;
+            eval('obj = ' + serialize({ hello() { return true; } }));
+
+            expect(obj.hello()).to.equal(true);
+        });
+
+        it('should serialize functions that contain dates', function () {
+           function fn(arg1) {return new Date('2016-04-28T22:02:17.156Z')};
+            expect(serialize(fn)).to.be.a('string').equal('function fn(arg1) {return new Date(\'2016-04-28T22:02:17.156Z\')}');
+        });
+
+        it('should deserialize functions that contain dates', function () {
+            var fn; eval('fn = ' + serialize(function () { return new Date('2016-04-28T22:02:17.156Z') }));
+            expect(fn).to.be.a('function');
+            expect(fn().getTime()).to.equal(new Date('2016-04-28T22:02:17.156Z').getTime());
+        });
+
+        it('should serialize functions that return other functions', function () {
+            function fn() {return function(arg1) {return arg1 + 5}};
+            expect(serialize(fn)).to.be.a('string').equal('function fn() {return function(arg1) {return arg1 + 5}}');
+        });
+
+        it('should deserialize functions that return other functions', function () {
+            var fn; eval('fn = ' + serialize(function () { return function(arg1) {return arg1 + 5} }));
+            expect(fn).to.be.a('function');
+            expect(fn()(7)).to.equal(12);
+        });
+    });
+
+    describe('arrow-functions', function () {
+        it('should serialize arrow functions', function () {
+            var fn = () => {};
+            expect(serialize(fn)).to.be.a('string').equal('() => {}');
+        });
+
+        it('should deserialize arrow functions', function () {
+            var fn; eval('fn = ' + serialize(() => true));
+            expect(fn).to.be.a('function');
+            expect(fn()).to.equal(true);
+        });
+
+        it('should serialize arrow functions with one argument', function () {
+            var fn = arg1 => {}
+            expect(serialize(fn)).to.be.a('string').equal('arg1 => {}');
+        });
+
+        it('should deserialize arrow functions with one argument', function () {
+            var fn; eval('fn = ' + serialize(arg1 => {}));
+            expect(fn).to.be.a('function');
+            expect(fn.length).to.equal(1);
+        });
+
+        it('should serialize arrow functions with multiple arguments', function () {
+            var fn = (arg1, arg2) => {}
+            expect(serialize(fn)).to.equal('(arg1, arg2) => {}');
+        });
+
+        it('should deserialize arrow functions with multiple arguments', function () {
+            var fn; eval('fn = ' + serialize( (arg1, arg2) => {}));
+            expect(fn).to.be.a('function');
+            expect(fn.length).to.equal(2);
+        });
+
+        it('should serialize arrow functions with bodies', function () {
+            var fn = () => { return true; }
+            expect(serialize(fn)).to.equal('() => { return true; }');
+        });
+
+        it('should deserialize arrow functions with bodies', function () {
+            var fn; eval('fn = ' + serialize( () => { return true; }));
+            expect(fn).to.be.a('function');
+            expect(fn()).to.equal(true);
+        });
+
+        it('should serialize enhanced literal objects', function () {
+            var obj = {
+                foo: () => { return true; },
+                bar: arg1 => { return true; },
+                baz: (arg1, arg2) => { return true; }
+            };
+
+            expect(serialize(obj)).to.equal('{"foo":() => { return true; },"bar":arg1 => { return true; },"baz":(arg1, arg2) => { return true; }}');
+        });
+
+        it('should deserialize enhanced literal objects', function () {
+            var obj;
+            eval('obj = ' + serialize({                foo: () => { return true; },
+                foo: () => { return true; },
+                bar: arg1 => { return true; },
+                baz: (arg1, arg2) => { return true; }
+            }));
+
+            expect(obj.foo()).to.equal(true);
+            expect(obj.bar('arg1')).to.equal(true);
+            expect(obj.baz('arg1', 'arg1')).to.equal(true);
+        });
+
+        it('should serialize arrow functions with added properties', function () {
+            var fn = () => {};
+            fn.property1 = 'a string'
+            expect(serialize(fn)).to.be.a('string').equal('() => {}');
+        });
+
+        it('should deserialize arrow functions with added properties', function () {
+            var fn; eval('fn = ' + serialize( () => { this.property1 = 'a string'; return 5 }));
+            expect(fn).to.be.a('function');
+            expect(fn()).to.equal(5);
+        });
+
+         it('should serialize arrow functions that return other functions', function () {
+            var fn = arg1 => { return arg2 => arg1 + arg2 };
+            expect(serialize(fn)).to.be.a('string').equal('arg1 => { return arg2 => arg1 + arg2 }');
+          });
+
+        it('should deserialize arrow functions that return other functions', function () {
+            var fn; eval('fn = ' + serialize(arg1 => { return arg2 => arg1 + arg2 } ));
+            expect(fn).to.be.a('function');
+            expect(fn(2)(3)).to.equal(5);
+        });
     });
 
     describe('regexps', function () {
         it('should serialize constructed regexps', function () {
             var re = new RegExp('asdf');
-            expect(serialize(re)).to.be.a('string').equal('/asdf/');
+            expect(serialize(re)).to.be.a('string').equal('new RegExp("asdf", "")');
         });
 
         it('should deserialize constructed regexps', function () {
@@ -125,7 +276,7 @@ describe('serialize( obj )', function () {
 
         it('should serialize literal regexps', function () {
             var re = /asdf/;
-            expect(serialize(re)).to.be.a('string').equal('/asdf/');
+            expect(serialize(re)).to.be.a('string').equal('new RegExp("asdf", "")');
         });
 
         it('should deserialize literal regexps', function () {
@@ -136,7 +287,7 @@ describe('serialize( obj )', function () {
 
         it('should serialize regexps with flags', function () {
             var re = /^asdf$/gi;
-            expect(serialize(re)).to.equal('/^asdf$/gi');
+            expect(serialize(re)).to.equal('new RegExp("^asdf$", "gi")');
         });
 
         it('should deserialize regexps with flags', function () {
@@ -148,8 +299,8 @@ describe('serialize( obj )', function () {
         });
 
         it('should serialize regexps with escaped chars', function () {
-            expect(serialize(/\..*/)).to.equal('/\\..*/');
-            expect(serialize(new RegExp('\\..*'))).to.equal('/\\..*/');
+            expect(serialize(/\..*/)).to.equal('new RegExp("\\\\..*", "")');
+            expect(serialize(new RegExp('\\..*'))).to.equal('new RegExp("\\\\..*", "")');
         });
 
         it('should deserialize regexps with escaped chars', function () {
@@ -160,6 +311,145 @@ describe('serialize( obj )', function () {
             expect(re).to.be.a('RegExp');
             expect(re.source).to.equal('\\..*');
         });
+
+        it('should serialize dangerous regexps', function () {
+            var re = /[<\/script><script>alert('xss')\/\/]/
+            expect(serialize(re)).to.be.a('string').equal('new RegExp("[\\u003C\\\\\\u002Fscript\\u003E\\u003Cscript\\u003Ealert(\'xss\')\\\\\\u002F\\\\\\u002F]", "")');
+        });
+    });
+
+    describe('dates', function () {
+        it('should serialize dates', function () {
+            var d = new Date('2016-04-28T22:02:17.156Z');
+            expect(serialize(d)).to.be.a('string').equal('new Date("2016-04-28T22:02:17.156Z")');
+            expect(serialize({t: [d]})).to.be.a('string').equal('{"t":[new Date("2016-04-28T22:02:17.156Z")]}');
+        });
+
+        it('should deserialize a date', function () {
+            var d = eval(serialize(new Date('2016-04-28T22:02:17.156Z')));
+            expect(d).to.be.a('Date');
+            expect(d.toISOString()).to.equal('2016-04-28T22:02:17.156Z');
+        });
+
+        it('should deserialize a string that is not a valid date', function () {
+            var d = eval(serialize('2016-04-28T25:02:17.156Z'));
+            expect(d).to.be.a('string');
+            expect(d).to.equal('2016-04-28T25:02:17.156Z');
+        });
+
+        it('should serialize dates within objects', function () {
+            var d = {foo: new Date('2016-04-28T22:02:17.156Z')};
+            expect(serialize(d)).to.be.a('string').equal('{"foo":new Date("2016-04-28T22:02:17.156Z")}');
+            expect(serialize({t: [d]})).to.be.a('string').equal('{"t":[{"foo":new Date("2016-04-28T22:02:17.156Z")}]}');
+        });
+    });
+
+    describe('maps', function () {
+        it('should serialize maps', function () {
+            var regexKey = /.*/;
+            var m = new Map([
+                ['a', 123],
+                [regexKey, 456],
+                [Infinity, 789]
+            ]);
+            expect(serialize(m)).to.be.a('string').equal('new Map([["a",123],[new RegExp(".*", ""),456],[Infinity,789]])');
+            expect(serialize({t: [m]})).to.be.a('string').equal('{"t":[new Map([["a",123],[new RegExp(".*", ""),456],[Infinity,789]])]}');
+        });
+
+        it('should deserialize a map', function () {
+            var m = eval(serialize(new Map([
+                ['a', 123],
+                [null, 456],
+                [Infinity, 789]
+            ])));
+            expect(m).to.be.a('Map');
+            expect(m.get(null)).to.equal(456);
+        });
+    });
+
+    describe('sets', function () {
+        it('should serialize sets', function () {
+            var regex = /.*/;
+            var m = new Set([
+                'a',
+                123,
+                regex,
+                Infinity
+            ]);
+            expect(serialize(m)).to.be.a('string').equal('new Set(["a",123,new RegExp(".*", ""),Infinity])');
+            expect(serialize({t: [m]})).to.be.a('string').equal('{"t":[new Set(["a",123,new RegExp(".*", ""),Infinity])]}');
+        });
+
+        it('should deserialize a set', function () {
+            var m = eval(serialize(new Set([
+                'a',
+                123,
+                null,
+                Infinity
+            ])));
+            expect(m).to.be.a('Set');
+            expect(m.has(null)).to.equal(true);
+        });
+    });
+
+    describe('sparse arrays', function () {
+        it('should serialize sparse arrays', function () {
+            var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+            delete a[0];
+            a.length = 3;
+            a[5] = "wat"
+            expect(serialize(a)).to.be.a('string').equal('Array.prototype.slice.call({"1":2,"2":3,"5":"wat","length":6})');
+            expect(serialize({t: [a]})).to.be.a('string').equal('{"t":[Array.prototype.slice.call({"1":2,"2":3,"5":"wat","length":6})]}');
+        });
+
+        it('should deserialize a sparse array', function () {
+            var a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+            delete a[0];
+            a.length = 3;
+            a[5] = "wat"
+            var b = eval(serialize(a));
+            expect(b).to.be.a('Array').deep.equal([ , 2, 3, , , 'wat' ]);
+        });
+    });
+
+    describe('Infinity', function () {
+        it('should serialize Infinity', function () {
+            expect(serialize(Infinity)).to.equal('Infinity');
+            expect(serialize({t: [Infinity]})).to.be.a('string').equal('{"t":[Infinity]}');
+        });
+
+        it('should deserialize Infinity', function () {
+            var d = eval(serialize(Infinity));
+            expect(d).to.equal(Infinity);
+        });
+
+        it('should serialize -Infinity', function () {
+            expect(serialize(-Infinity)).to.equal('-Infinity');
+            expect(serialize({t: [-Infinity]})).to.be.a('string').equal('{"t":[-Infinity]}');
+        });
+
+        it('should deserialize -Infinity', function () {
+            var d = eval(serialize(-Infinity));
+            expect(d).to.equal(-Infinity);
+        });
+    });
+
+    describe('BigInt', function () {
+        it('should serialize BigInt', function () {
+            var b = BigInt(9999);
+            expect(serialize(b)).to.equal('BigInt("9999")');
+            expect(serialize({t: [b]})).to.be.a('string').equal('{"t":[BigInt("9999")]}');
+        });
+
+        it('should deserialize BigInt', function () {
+            var d = eval(serialize(BigInt(9999)));
+            expect(d).to.be.a('BigInt');
+            expect(d.toString()).to.equal('9999');
+        });
+
+        it('should throw error for invalid bigint', function () {
+            expect(() => serialize(BigInt('abc'))).to.throw(Error);
+        });
     });
 
     describe('XSS', function () {
@@ -197,6 +487,48 @@ describe('serialize( obj )', function () {
             expect(serialize(fn, {isJSON: false})).to.equal('function fn() { return true; }');
 
             expect(serialize(fn, {isJSON: true})).to.equal('undefined');
+            expect(serialize([1], {isJSON: true, space: 2})).to.equal('[\n  1\n]');
+        });
+
+        it('should accept a `unsafe` option', function () {
+            expect(serialize('foo', {unsafe: true})).to.equal('"foo"');
+            expect(serialize('foo', {unsafe: false})).to.equal('"foo"');
+
+            function fn() { return true; }
+
+            expect(serialize(fn)).to.equal('function fn() { return true; }');
+            expect(serialize(fn, {unsafe: false})).to.equal('function fn() { return true; }');
+            expect(serialize(fn, {unsafe: undefined})).to.equal('function fn() { return true; }');
+            expect(serialize(fn, {unsafe: "true"})).to.equal('function fn() { return true; }');
+
+            expect(serialize(fn, {unsafe: true})).to.equal('function fn() { return true; }');
+            expect(serialize(["1"], {unsafe: false, space: 2})).to.equal('[\n  "1"\n]');
+            expect(serialize(["1"], {unsafe: true, space: 2})).to.equal('[\n  "1"\n]');
+            expect(serialize(["<"], {space: 2})).to.equal('[\n  "\\u003C"\n]');
+            expect(serialize(["<"], {unsafe: true, space: 2})).to.equal('[\n  "<"\n]');
+        });
+
+        it("should accept a `ignoreFunction` option", function() {
+            function fn() { return true; }
+            var obj = {
+                fn: fn,
+                fn_arrow: () => {
+                    return true;
+                }
+            };            
+            var obj2 = {
+                num: 123,
+                str: 'str',
+                fn: fn
+            }
+            // case 1. Pass function to serialize
+            expect(serialize(fn, { ignoreFunction: true })).to.equal('undefined');
+            // case 2. Pass function(arrow) in object to serialze
+            expect(serialize(obj, { ignoreFunction: true })).to.equal('{}');
+            // case 3. Other features should work
+            expect(serialize(obj2, { ignoreFunction: true })).to.equal(
+              '{"num":123,"str":"str"}'
+            );
         });
     });
 
@@ -213,4 +545,17 @@ describe('serialize( obj )', function () {
             expect(serialize([1], 2)).to.equal('[\n  1\n]');
         });
     });
+
+    describe('placeholders', function() {
+        it('should not be replaced within string literals', function () {
+            // Since we made the UID deterministic this should always be the placeholder
+            var fakePlaceholder = '"@__R-0000000000000000-0__@';
+            var serialized = serialize({bar: /1/i, foo: fakePlaceholder}, {uid: 'foo'});
+            var obj = eval('(' + serialized + ')');
+            expect(obj).to.be.a('Object');
+            expect(obj.foo).to.be.a('String');
+            expect(obj.foo).to.equal(fakePlaceholder);
+        });
+    });
+
 });