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..9c889b4 100644
--- a/.npmignore
+++ b/.npmignore
@@ -4,3 +4,4 @@ test/
 .gitignore
 .npmignore
 .travis.yml
+.nyc_output
diff --git a/.travis.yml b/.travis.yml
index 55c5e48..ac233c3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
 language: node_js
 node_js:
-    - "8"
     - "10"
+    - "12"
diff --git a/README.md b/README.md
index 585cd54..1339474 100644
--- a/README.md
+++ b/README.md
@@ -40,19 +40,20 @@ serialize({
     bool : true,
     nil  : null,
     undef: undefined,
-    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
+    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,date:new Date("2016-04-28T22:02:17.156Z"),new Map([["hello", "world"]]),new Set([123,456]),"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.
@@ -105,6 +106,15 @@ This option is to signal `serialize()` that we want to do a straight conversion,
 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
+serialize(obj, {ignoreFunction: true});
+```
+
 ## Deserializing
 
 For some use cases you might also need to deserialize the string. This is explicitly not part of this module. However, you can easily write it yourself:
diff --git a/index.js b/index.js
index b10a500..cf14df4 100644
--- a/index.js
+++ b/index.js
@@ -6,9 +6,12 @@ See the accompanying LICENSE file for terms.
 
 'use strict';
 
+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|D|M|S)-' + UID + '-(\\d+)__@"', 'g');
+var UID_LENGTH          = 16;
+var UID                 = generateUID();
+var PLACE_HOLDER_REGEXP = new RegExp('(\\\\)?"@__(F|R|D|M|S|U|I|B)-' + UID + '-(\\d+)__@"', 'g');
 
 var IS_NATIVE_CODE_REGEXP = /\{\s*\[native code\]\s*\}/g;
 var IS_PURE_FUNCTION = /function.*?\(/;
@@ -31,6 +34,27 @@ 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 = {});
 
@@ -44,11 +68,20 @@ module.exports = function serialize(obj, options) {
     var dates     = [];
     var maps      = [];
     var sets      = [];
+    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;
         }
 
@@ -79,6 +112,18 @@ module.exports = function serialize(obj, options) {
             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;
     }
 
@@ -119,6 +164,16 @@ module.exports = function serialize(obj, options) {
       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.
@@ -142,20 +197,27 @@ module.exports = function serialize(obj, options) {
         str = str.replace(UNSAFE_CHARS_REGEXP, escapeUnsafeChars);
     }
 
-    if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0) {
+    if (functions.length === 0 && regexps.length === 0 && dates.length === 0 && maps.length === 0 && sets.length === 0 && undefs.length === 0 && infinities.length === 0 && bigInts.length === 0) {
         return str;
     }
 
     // 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, type, valueIndex) {
+    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 + "\")";
         }
 
         if (type === 'M') {
@@ -166,6 +228,18 @@ module.exports = function serialize(obj, options) {
             return "new Set(" + serialize(Array.from(sets[valueIndex].values()), 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
index 60c2eaf..cc54a88 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,21 +1,312 @@
 {
   "name": "serialize-javascript",
-  "version": "1.9.1",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "abbrev": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
-      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+    "@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",
+      "integrity": "sha512-SFxgwYmZ3HZPyZwJRiVNLRHWuW2OgE5k2nrVs6D9Iv4PPnXVffuEHy83Sfx/l4SqF+5kyJXjAyUmrG7tNm+qVg==",
+      "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",
+      "integrity": "sha512-a0DjNS1prnBsoKx83dP2falChcs7p3i8VMzdrSbfLhuQra/2ENC4sbri34dz/rWmDADsmF1q5GbfaXydh0Jbjg==",
+      "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",
+        "@babel/helper-optimise-call-expression": "^7.10.1",
+        "@babel/traverse": "^7.10.1",
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-simple-access": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-simple-access/-/helper-simple-access-7.10.1.tgz",
+      "integrity": "sha512-VSWpWzRzn9VtgMJBIWTZ+GP107kZdQ4YplJlCmIrjoLVSi/0upixezHCDG8kpPVTBJpKfxTH01wDhh+jS2zKbw==",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.10.1",
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.10.1.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.1.tgz",
+      "integrity": "sha512-5vW/JXLALhczRCWP0PnFDMCJAchlBvM7f4uk/jXritBnIa6E1KmqmtrS3yn1LAnxFBypQ3eneLuXjsnfQsgILw==",
       "dev": true
     },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+    "@babel/helpers": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.10.1.tgz",
+      "integrity": "sha512-muQNHF+IdU6wGgkaJyhhEmI54MOZBKsFfsXFhboz1ybwJ1Kl7IHlbm2a++4jwrmY5UYsgitt5lfqo1wMFcHmyw==",
       "dev": true,
-      "optional": true
+      "requires": {
+        "@babel/template": "^7.10.1",
+        "@babel/traverse": "^7.10.1",
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.10.1.tgz",
+      "integrity": "sha512-8rMof+gVP8mxYZApLF/JgNDAkdKa+aJt3ZYxF8z6+j/hpeXL7iMsKCPHa2jNMHu/qqBwzQF4OHNoYi8dMA/rYg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.1",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@babel/parser": {
+      "version": "7.10.2",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.10.2.tgz",
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+      "dev": true
+    },
+    "@babel/template": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.10.1.tgz",
+      "integrity": "sha512-OQDg6SqvFSsc9A0ej6SKINWrpJiNonRIniYondK2ViKhB06i3c0s+76XUft71iqBEe9S1OKsHwPAjfHnuvnCig==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.1",
+        "@babel/parser": "^7.10.1",
+        "@babel/types": "^7.10.1"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.10.1",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.10.1.tgz",
+      "integrity": "sha512-C/cTuXeKt85K+p08jN6vMDz8vSV0vZcI0wmQ36o6mjbuo++kPMdpOYw23W2XH04dbRt9/nMEfA4W3eR21CD+TQ==",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.10.1",
+        "@babel/generator": "^7.10.1",
+        "@babel/helper-function-name": "^7.10.1",
+        "@babel/helper-split-export-declaration": "^7.10.1",
+        "@babel/parser": "^7.10.1",
+        "@babel/types": "^7.10.1",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.13"
+      },
+      "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/types": {
+      "version": "7.10.2",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.10.2.tgz",
+      "integrity": "sha512-AD3AwWBSz0AWF0AkCN9VPiWrvldXq+/e3cHa4J89vo4ymjz1XwrBFFVZmkJTsQIPNk+ZVomPSXUJqq8yyjZsng==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.10.1",
+        "lodash": "^4.17.13",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
+    "@istanbuljs/load-nyc-config": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
+      "integrity": "sha512-VjeHSlIzpv/NyD3N0YuHfXOPDIixcA1q2ZV98wsMqcYlPmv2n3Yb2lYP9XMElnaFVXg5A7YLTeLu6V84uQDjmQ==",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.3.1",
+        "find-up": "^4.1.0",
+        "get-package-type": "^0.1.0",
+        "js-yaml": "^3.13.1",
+        "resolve-from": "^5.0.0"
+      },
+      "dependencies": {
+        "find-up": {
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     "y18n": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
@@ -1195,22 +2043,21 @@
       "dev": 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": {
@@ -1242,9 +2089,9 @@
       }
     },
     "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",
@@ -1252,58 +2099,14 @@
       }
     },
     "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"
-      },
-      "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==",
-          "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"
-          }
-        }
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
       }
     }
   }
diff --git a/package.json b/package.json
index 38de0ef..aab2415 100644
--- a/package.json
+++ b/package.json
@@ -1,11 +1,11 @@
 {
   "name": "serialize-javascript",
-  "version": "1.9.1",
+  "version": "4.0.0",
   "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",
@@ -27,7 +27,10 @@
   "devDependencies": {
     "benchmark": "^2.1.4",
     "chai": "^4.1.0",
-    "istanbul": "^0.4.5",
-    "mocha": "^6.2.0"
+    "mocha": "^7.0.0",
+    "nyc": "^15.0.0"
+  },
+  "dependencies": {
+    "randombytes": "^2.1.0"
   }
 }
diff --git a/test/unit/serialize.js b/test/unit/serialize.js
index a350449..a618dae 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 () {
@@ -244,7 +265,7 @@ describe('serialize( obj )', function () {
     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 () {
@@ -255,7 +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 () {
@@ -266,7 +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 () {
@@ -278,8 +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 () {
@@ -290,6 +311,11 @@ 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 () {
@@ -323,16 +349,18 @@ describe('serialize( obj )', function () {
             var regexKey = /.*/;
             var m = new Map([
                 ['a', 123],
-                [regexKey, 456]
+                [regexKey, 456],
+                [Infinity, 789]
             ]);
-            expect(serialize(m)).to.be.a('string').equal('new Map([["a",123],[/.*/,456]])');
-            expect(serialize({t: [m]})).to.be.a('string').equal('{"t":[new Map([["a",123],[/.*/,456]])]}');
+            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]
+                [null, 456],
+                [Infinity, 789]
             ])));
             expect(m).to.be.a('Map');
             expect(m.get(null)).to.equal(456);
@@ -345,23 +373,65 @@ describe('serialize( obj )', function () {
             var m = new Set([
                 'a',
                 123,
-                regex
+                regex,
+                Infinity
             ]);
-            expect(serialize(m)).to.be.a('string').equal('new Set(["a",123,/.*/])');
-            expect(serialize({t: [m]})).to.be.a('string').equal('{"t":[new Set(["a",123,/.*/])]}');
+            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
+                null,
+                Infinity
             ])));
             expect(m).to.be.a('Set');
             expect(m.has(null)).to.equal(true);
         });
     });
 
+    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 () {
         it('should encode unsafe HTML chars to Unicode', function () {
             expect(serialize('</script>')).to.equal('"\\u003C\\u002Fscript\\u003E"');
@@ -417,6 +487,29 @@ describe('serialize( obj )', function () {
             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"}'
+            );
+        });
     });
 
     describe('backwards-compatability', function () {
@@ -432,4 +525,17 @@ 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);
+        });
+    });
+
 });