diff --git a/xml2js/index.d.ts b/xml2js/index.d.ts
index e9d4e12ad0..0e180f7ba8 100644
--- a/xml2js/index.d.ts
+++ b/xml2js/index.d.ts
@@ -9,7 +9,7 @@ export = xml2js;
 
 declare namespace xml2js {
     function parseString(xml: string, callback: (err: any, result: any) => void): void;
-    function parseString(xml: string, options: Options, callback: (err: any, result: any) => void): void;
+    function parseString(xml: string, options: OptionsV2, callback: (err: any, result: any) => void): void;
 
     var defaults: {
         '0.1': Options;
@@ -17,41 +17,15 @@ declare namespace xml2js {
     }
 
     class Builder {
-        constructor(options?: BuilderOptions);
+        constructor(options?: OptionsV2);
         buildObject(rootObj: any): string;
     }
 
     class Parser {
-        constructor(options?: Options);
-        processAsync(): any;
-        assignOrPush(obj: any, key: string, newValue: any): any;
-        reset(): any;
+        constructor(options?: OptionsV2);
         parseString(str: string, cb?: Function): void;
     }
 
-    interface RenderOptions {
-        indent?: string;
-        newline?: string;
-        pretty?: boolean;
-    }
-
-    interface XMLDeclarationOptions {
-        encoding?: string;
-        standalone?: boolean;
-        version?: string;
-    }
-
-    interface BuilderOptions {
-        doctype?: any;
-        headless?: boolean;
-        indent?: string;
-        newline?: string;
-        pretty?: boolean;
-        renderOpts?: RenderOptions;
-        rootName?: string;
-        xmldec?: XMLDeclarationOptions;
-    }
-
     interface Options {
         async?: boolean;
         attrkey?: string;
@@ -66,6 +40,7 @@ declare namespace xml2js {
         explicitChildren?: boolean;
         explicitRoot?: boolean;
         ignoreAttrs?: boolean;
+        includeWhiteChars?: boolean;
         mergeAttrs?: boolean;
         normalize?: boolean;
         normalizeTags?: boolean;
@@ -96,3 +71,4 @@ declare namespace xml2js {
         cdata?: boolean;
     }
 }
+
diff --git a/xml2js/tsconfig.json b/xml2js/tsconfig.json
index 61e4e5e52f..8e23bd3395 100644
--- a/xml2js/tsconfig.json
+++ b/xml2js/tsconfig.json
@@ -3,7 +3,7 @@
         "module": "commonjs",
         "target": "es6",
         "noImplicitAny": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"
@@ -16,4 +16,4 @@
         "index.d.ts",
         "xml2js-tests.ts"
     ]
-}
\ No newline at end of file
+}
diff --git a/xml2js/xml2js-tests.ts b/xml2js/xml2js-tests.ts
index 3e3981156e..38306d9bb4 100644
--- a/xml2js/xml2js-tests.ts
+++ b/xml2js/xml2js-tests.ts
@@ -1,9 +1,35 @@
 
 import xml2js = require('xml2js');
 
-xml2js.parseString("<root>Hello xml2js!</root>", (err: any, result: any) => { });
+xml2js.parseString('<root>Hello xml2js!</root>', (err: any, result: any) => { });
 
-xml2js.parseString("<root>Hello xml2js!</root>", {trim: true}, (err: any, result: any) => { });
+xml2js.parseString('<root>Hello xml2js!</root>', {trim: true}, (err: any, result: any) => { });
+
+xml2js.parseString('<root>Hello xml2js!</root>', {
+    attrkey: '$',
+    charkey: '_',
+    explicitCharkey: false,
+    trim: false,
+    normalizeTags: false,
+    explicitRoot: true,
+    emptyTag: '',
+    explicitArray: true,
+    ignoreAttrs: false,
+    mergeAttrs: false,
+    validator: undefined,
+    xmlns: false,
+    explicitChildren: false,
+    childkey: '$$',
+    preserveChildrenOrder: false,
+    charsAsChildren: false,
+    includeWhiteChars: false,
+    async: false,
+    strict: true,
+    attrNameProcessors: undefined,
+    attrValueProcessors: undefined,
+    tagNameProcessors: undefined,
+    valueProcessors: undefined
+}, (err: any, result: any) => { });
 
 var builder = new xml2js.Builder({
     renderOpts: {
@@ -11,6 +37,23 @@ var builder = new xml2js.Builder({
     }
 });
 
+var builder = new xml2js.Builder({
+    rootName: 'root',
+    renderOpts: {
+        pretty: true,
+        indent: ' ',
+        newline: '\n'
+    },
+    xmldec: {
+        version: '1.0',
+        encoding: 'UTF-8',
+        standalone: true
+    },
+    doctype: { ext: 'hello.dtd' },
+    headless: false,
+    cdata: false
+});
+
 var outString = builder.buildObject({
     'hello': 'xml2js!'
 });
@@ -22,4 +65,5 @@ v1Defaults.async = true;
 
 var v2Defaults = xml2js.defaults['0.2'];
 v2Defaults.async = false;
-v2Defaults.chunkSize = 20000;
\ No newline at end of file
+v2Defaults.chunkSize = 20000;
+