diff --git a/types/jsdom/index.d.ts b/types/jsdom/index.d.ts
index 5ccdd33a65..cfb54fa25f 100644
--- a/types/jsdom/index.d.ts
+++ b/types/jsdom/index.d.ts
@@ -7,7 +7,7 @@
 /// <reference types="node" />
 
 import { EventEmitter } from 'events';
-import { ElementLocation } from 'parse5';
+import { MarkupData } from 'parse5';
 import * as tough from 'tough-cookie';
 import { Script } from 'vm';
 
@@ -32,7 +32,7 @@ export class JSDOM {
     /**
      * The nodeLocation() method will find where a DOM node is within the source document, returning the parse5 location info for the node.
      */
-    nodeLocation(node: Node): ElementLocation | null;
+    nodeLocation(node: Node): MarkupData.ElementLocation | null;
 
     /**
      * The built-in vm module of Node.js allows you to create Script instances,
diff --git a/types/jsdom/package.json b/types/jsdom/package.json
index c208056015..ef0b8c56fc 100644
--- a/types/jsdom/package.json
+++ b/types/jsdom/package.json
@@ -1,6 +1,6 @@
 {
     "private": true,
     "dependencies": {
-        "parse5": "^3.0.2"
+        "parse5": "^4.0.0"
     }
 }
diff --git a/types/jsdom/tsconfig.json b/types/jsdom/tsconfig.json
index fe7f9dd41f..d75878188a 100644
--- a/types/jsdom/tsconfig.json
+++ b/types/jsdom/tsconfig.json
@@ -15,10 +15,13 @@
         ],
         "types": [],
         "noEmit": true,
-        "forceConsistentCasingInFileNames": true
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "parse5": [ "parse5/v4" ]
+        }
     },
     "files": [
         "index.d.ts",
         "jsdom-tests.ts"
     ]
-}
\ No newline at end of file
+}
diff --git a/types/mozilla-readability/tsconfig.json b/types/mozilla-readability/tsconfig.json
index 6ec688cf2f..9679936061 100644
--- a/types/mozilla-readability/tsconfig.json
+++ b/types/mozilla-readability/tsconfig.json
@@ -15,10 +15,13 @@
         ],
         "types": [],
         "noEmit": true,
-        "forceConsistentCasingInFileNames": true
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "parse5": [ "parse5/v4" ]
+        }
     },
     "files": [
         "index.d.ts",
         "mozilla-readability-tests.ts"
     ]
-}
\ No newline at end of file
+}
diff --git a/types/parse5/v4/index.d.ts b/types/parse5/v4/index.d.ts
new file mode 100644
index 0000000000..1f8b5a8df7
--- /dev/null
+++ b/types/parse5/v4/index.d.ts
@@ -0,0 +1,1081 @@
+// Type definitions for parse5 4.0
+// Project: https://github.com/inikulin/parse5
+// Definitions by:  Ivan Nikulin <https://github.com/inikulin>
+//                  Andy Patterson <https://github.com/andnp>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+/// <reference types="node" />
+import * as stream from "stream";
+
+// Markup data
+//-----------------------------------------------------------------------------------
+declare namespace MarkupData {
+    interface Location {
+        /**
+         * One-based line index
+         */
+        line: number;
+        /**
+         * One-based column index
+         */
+        col: number;
+        /**
+         * Zero-based first character index
+         */
+        startOffset: number;
+        /**
+         * Zero-based last character index
+         */
+        endOffset: number;
+    }
+
+    interface AttributesLocation {
+        [attributeName: string]: Location;
+    }
+
+    interface StartTagLocation extends Location {
+        /**
+         * Start tag attributes' location info
+         */
+        attrs: AttributesLocation
+    }
+
+    interface ElementLocation extends StartTagLocation {
+        /**
+         * Element's start tag location info.
+         */
+        startTag: StartTagLocation;
+        /**
+         * Element's end tag location info.
+         */
+        endTag: Location;
+    }
+}
+
+// Options
+//-----------------------------------------------------------------------------------
+declare namespace Options {
+    export interface ParserOptions {
+        /**
+         * Enables source code location information. When enabled, each node (except the root node) will have a `__location` property.
+         * If the node is not an empty element, `__location` will be a {@link MarkupData.ElementLocation} object, otherwise it will be {@link MarkupData.Location}.
+         * If the element was implicitly created by the parser (as part of [tree correction](https://html.spec.whatwg.org/multipage/syntax.html#an-introduction-to-error-handling-and-strange-cases-in-the-parser)), its `__location` property will be `undefined`.
+         *
+         * **Default:** `false`
+         */
+        locationInfo?: boolean;
+        /**
+         * Specifies the resulting tree format.
+         *
+         * **Default:** `treeAdapters.default`
+         */
+        treeAdapter?: AST.TreeAdapter;
+    }
+
+    export interface SAXParserOptions {
+        /**
+         * Enables source code location information for the tokens.
+         * When enabled, each token event handler will receive {@link MarkupData.Location} (or {@link MarkupData.StartTagLocation})
+         * object as its last argument.
+         */
+        locationInfo?: boolean;
+    }
+
+    export interface SerializerOptions {
+        /***
+         * Specifies input tree format.
+         *
+         * **Default:** `treeAdapters.default`
+         */
+        treeAdapter?: AST.TreeAdapter;
+    }
+}
+
+
+// AST
+//-----------------------------------------------------------------------------------
+declare namespace AST {
+    /**
+     * [Document mode](https://dom.spec.whatwg.org/#concept-document-limited-quirks).
+     */
+    type DocumentMode = 'no-quirks' | 'quirks' | 'limited-quirks';
+
+    // Default tree adapter
+    namespace Default {
+        /**
+         * Element attribute.
+         */
+        interface Attribute {
+            /**
+             * The name of the attribute.
+             */
+            name: string;
+            /**
+             * The value of the attribute.
+             */
+            value: string;
+            /**
+             * The namespace of the attribute.
+             */
+            namespace?: string;
+            /**
+             * The namespace-related prefix of the attribute.
+             */
+            prefix?: string;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} Node interface.
+         */
+        interface Node {
+            /**
+             * The name of the node. E.g. {@link Document} will have `nodeName` equal to '#document'`.
+             */
+            nodeName: string;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} ParentNode interface.
+         */
+        interface ParentNode {
+            /**
+             * Child nodes.
+             */
+            childNodes: Node[];
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} DocumentType interface.
+         */
+        export interface DocumentType extends Node {
+            /**
+             * The name of the node.
+             */
+            nodeName: '#documentType';
+            /**
+             * Document type name.
+             */
+            name: string;
+            /**
+             * Document type public identifier.
+             */
+            publicId: string;
+            /**
+             * Document type system identifier.
+             */
+            systemId: string;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} Document interface.
+         */
+        export interface Document extends ParentNode {
+            /**
+             * The name of the node.
+             */
+            nodeName: '#document';
+            /**
+             * [Document mode](https://dom.spec.whatwg.org/#concept-document-limited-quirks).
+             */
+            mode: DocumentMode;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} DocumentFragment interface.
+         */
+        export interface DocumentFragment extends ParentNode {
+            /**
+             * The name of the node.
+             */
+            nodeName: '#document-fragment';
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} Element interface.
+         */
+        export interface Element extends ParentNode {
+            /**
+             * The name of the node. Equals to element {@link tagName}.
+             */
+            nodeName: string;
+            /**
+             * Element tag name.
+             */
+            tagName: string;
+            /**
+             * Element namespace.
+             */
+            namespaceURI: string;
+            /**
+             * List of element attributes.
+             */
+            attrs: Attribute[];
+            /**
+             * Parent node.
+             */
+            parentNode: ParentNode;
+            /**
+             * Element source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.ElementLocation;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} CommentNode interface.
+         */
+        export interface CommentNode extends Node {
+            /**
+             * The name of the node.
+             */
+            nodeName: '#comment';
+            /**
+             * Comment text.
+             */
+            data: string;
+            /**
+             * Parent node.
+             */
+            parentNode: ParentNode;
+            /**
+             * Comment source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.Location;
+        }
+
+        /**
+         * [Default tree adapter]{@link parse5.treeAdapters} TextNode interface.
+         */
+        export interface TextNode extends Node {
+            /**
+             * The name of the node.
+             */
+            nodeName: '#text';
+            /**
+             * Text content.
+             */
+            value: string;
+            /**
+             * Parent node.
+             */
+            parentNode: ParentNode;
+            /**
+             * Text node source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.Location;
+        }
+    }
+
+
+    // htmlparser2 tree adapter
+    namespace HtmlParser2 {
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} Node interface.
+         */
+        interface Node {
+            /**
+             * The type of the node. E.g. {@link Document} will have `type` equal to 'root'`.
+             */
+            type: string;
+            /**
+             * [DOM spec](https://dom.spec.whatwg.org/#dom-node-nodetype)-compatible node {@link type}.
+             */
+            nodeType: number;
+            /**
+             * Parent node.
+             */
+            parent: ParentNode;
+            /**
+             * Same as {@link parent}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            parentNode: ParentNode;
+            /**
+             * Previous sibling.
+             */
+            prev: Node;
+            /**
+             * Same as {@link prev}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            previousSibling: Node;
+            /**
+             * Next sibling.
+             */
+            next: Node;
+            /**
+             * Same as {@link next}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            nextSibling: Node;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} ParentNode interface.
+         */
+        interface ParentNode extends Node {
+            /**
+             * Child nodes.
+             */
+            children: Node[];
+            /**
+             * Same as {@link children}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            childNodes: Node[];
+            /**
+             * First child of the node.
+             */
+            firstChild: Node;
+            /**
+             * Last child of the node.
+             */
+            lastChild: Node;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} DocumentType interface.
+         */
+        export interface DocumentType extends Node {
+            /**
+             * The type of the node.
+             */
+            type: 'directive';
+            /**
+             * Node name.
+             */
+            name: '!doctype';
+            /**
+             * Serialized doctype {@link name}, {@link publicId} and {@link systemId}.
+             */
+            data: string;
+            /**
+             * Document type name.
+             */
+            'x-name':string;
+            /**
+             * Document type public identifier.
+             */
+            'x-publicId': string;
+            /**
+             * Document type system identifier.
+             */
+            'x-systemId': string;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} Document interface.
+         */
+        export interface Document extends ParentNode {
+            /**
+             * The type of the node.
+             */
+            type: 'root';
+            /**
+             * The name of the node.
+             */
+            name: 'root';
+            /**
+             * [Document mode](https://dom.spec.whatwg.org/#concept-document-limited-quirks).
+             */
+            'x-mode': DocumentMode;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} DocumentFragment interface.
+         */
+        export interface DocumentFragment extends ParentNode {
+            /**
+             * The type of the node.
+             */
+            type: 'root';
+            /**
+             * The name of the node.
+             */
+            name: 'root';
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} Element interface.
+         */
+        export interface Element extends ParentNode {
+            /**
+             * The name of the node. Equals to element {@link tagName}.
+             */
+            name: string;
+            /**
+             * Element tag name.
+             */
+            tagName: string;
+            /**
+             * Element namespace.
+             */
+            namespace: string;
+            /**
+             * Element attributes.
+             */
+            attribs: { [name: string]: string };
+            /**
+             * Element attribute namespaces.
+             */
+            'x-attribsNamespace': { [name: string]: string };
+            /**
+             * Element attribute namespace-related prefixes.
+             */
+            'x-attribsPrefix': { [name: string]: string };
+            /**
+             * Element source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.ElementLocation;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} CommentNode interface.
+         */
+        export interface CommentNode extends Node {
+            /**
+             * The name of the node.
+             */
+            name: 'comment';
+            /**
+             * Comment text.
+             */
+            data: string;
+            /**
+             * Same as {@link data}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            nodeValue: string;
+            /**
+             * Comment source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.Location;
+        }
+
+        /**
+         * [htmlparser2 tree adapter]{@link parse5.treeAdapters} TextNode interface.
+         */
+        export interface TextNode extends Node {
+            /**
+             * The name of the node.
+             */
+            name: 'text';
+            /**
+             * Text content.
+             */
+            data: string;
+            /**
+             * Same as {@link data}. [DOM spec](https://dom.spec.whatwg.org)-compatible alias.
+             */
+            nodeValue: string;
+            /**
+             * Comment source code location info. Available if location info is enabled via {@link Options.ParserOptions}.
+             */
+            __location?: MarkupData.Location;
+        }
+    }
+
+
+    // Unions
+    // NOTE: we use `Object` in unions to support custom tree adapter implementations.
+    // TypeScript Handbook suggests to always use `any` instead of `Object`, but in that
+    // case language service hints `any` as type, instead of actual union name.
+    /**
+     * Generic Node interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.Node}) to get access to the properties.
+     */
+    type Node = Default.Node | HtmlParser2.Node | Object;
+    /**
+     * Generic ParentNode interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.ParentNode}) to get access to the properties.
+     */
+    type ParentNode = Default.ParentNode | HtmlParser2.ParentNode | Object;
+    /**
+     * Generic DocumentType interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.DocumentType}) to get access to the properties.
+     */
+    type DocumentType = Default.DocumentType | HtmlParser2.DocumentType | Object;
+    /**
+     * Generic Document interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.Document}) to get access to the properties.
+     */
+    type Document = Default.Document | HtmlParser2.Document | Object;
+    /**
+     * Generic DocumentFragment interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.DocumentFragment}) to get access to the properties.
+     */
+    type DocumentFragment = Default.DocumentFragment | HtmlParser2.DocumentFragment | Object;
+    /**
+     * Generic Element interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.Element}) to get access to the properties.
+     */
+    type Element = Default.Element | HtmlParser2.Element | Object;
+    /**
+     * Generic TextNode interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.TextNode}) to get access to the properties.
+     */
+    type TextNode = Default.TextNode | HtmlParser2.TextNode | Object;
+    /**
+     * Generic CommentNode interface.
+     * Cast to the actual AST interface (e.g. {@link parse5.AST.Default.CommentNode}) to get access to the properties.
+     */
+    type CommentNode = Default.CommentNode | HtmlParser2.CommentNode | Object;
+
+
+    // Tree adapter interface
+    //-----------------------------------------------------------------------------------
+
+    /**
+     * Tree adapter is a set of utility functions that provides minimal required abstraction layer beetween parser and a specific AST format.
+     * Note that `TreeAdapter` is not designed to be a general purpose AST manipulation library. You can build such library
+     * on top of existing `TreeAdapter` or use one of the existing libraries from npm.
+     *
+     * @see [default implementation](https://github.com/inikulin/parse5/blob/master/lib/tree_adapters/default.js)
+     */
+    export interface TreeAdapter {
+        /**
+         * Creates a document node.
+         */
+        createDocument(): AST.Document;
+        /**
+         * Creates a document fragment node.
+         */
+        createDocumentFragment(): AST.DocumentFragment;
+        /**
+         * Creates an element node.
+         *
+         * @param tagName - Tag name of the element.
+         * @param namespaceURI - Namespace of the element.
+         * @param attrs - Attribute name-value pair array. Foreign attributes may contain `namespace` and `prefix` fields as well.
+         */
+        createElement(tagName: string, namespaceURI: string, attrs: AST.Default.Attribute[]): AST.Element;
+        /**
+         * Creates a comment node.
+         *
+         * @param data - Comment text.
+         */
+        createCommentNode(data: string): AST.CommentNode;
+        /**
+         * Appends a child node to the given parent node.
+         *
+         * @param parentNode - Parent node.
+         * @param newNode -  Child node.
+         */
+        appendChild(parentNode: AST.ParentNode, newNode: AST.Node): void;
+        /**
+         * Inserts a child node to the given parent node before the given reference node.
+         *
+         * @param parentNode - Parent node.
+         * @param newNode -  Child node.
+         * @param referenceNode -  Reference node.
+         */
+        insertBefore(parentNode: AST.ParentNode, newNode: AST.Node, referenceNode: AST.Node): void;
+        /**
+         * Sets the `<template>` element content element.
+         *
+         * @param templateElement - `<template>` element.
+         * @param contentElement -  Content element.
+         */
+        setTemplateContent(templateElement: AST.Element, contentElement: AST.DocumentFragment): void;
+        /**
+         * Returns the `<template>` element content element.
+         *
+         * @param templateElement - `<template>` element.
+         */
+        getTemplateContent(templateElement: AST.Element): AST.DocumentFragment;
+        /**
+         * Sets the document type. If the `document` already contains a document type node, the `name`, `publicId` and `systemId`
+         * properties of this node will be updated with the provided values. Otherwise, creates a new document type node
+         * with the given properties and inserts it into the `document`.
+         *
+         * @param document - Document node.
+         * @param name -  Document type name.
+         * @param publicId - Document type public identifier.
+         * @param systemId - Document type system identifier.
+         */
+        setDocumentType(document: AST.Document, name: string, publicId: string, systemId: string): void;
+        /**
+         * Sets the [document mode](https://dom.spec.whatwg.org/#concept-document-limited-quirks).
+         *
+         * @param document - Document node.
+         * @param mode - Document mode.
+         */
+        setDocumentMode(document: AST.Document, mode: AST.DocumentMode): void;
+        /**
+         * Returns [document mode](https://dom.spec.whatwg.org/#concept-document-limited-quirks).
+         *
+         * @param document - Document node.
+         */
+        getDocumentMode(document: AST.Document): AST.DocumentMode;
+        /**
+         * Removes a node from its parent.
+         *
+         * @param node - Node to remove.
+         */
+        detachNode(node: AST.Node): void;
+        /**
+         * Inserts text into a node. If the last child of the node is a text node, the provided text will be appended to the
+         * text node content. Otherwise, inserts a new text node with the given text.
+         *
+         * @param parentNode - Node to insert text into.
+         * @param text - Text to insert.
+         */
+        insertText(parentNode: AST.ParentNode, text: string): void;
+        /**
+         * Inserts text into a sibling node that goes before the reference node. If this sibling node is the text node,
+         * the provided text will be appended to the text node content. Otherwise, inserts a new sibling text node with
+         * the given text before the reference node.
+         *
+         * @param parentNode - Node to insert text into.
+         * @param text - Text to insert.
+         * @param referenceNode - Node to insert text before.
+         */
+        insertTextBefore(parentNode: AST.ParentNode, text: string, referenceNode: AST.Node): void;
+        /**
+         * Copies attributes to the given element. Only attributes that are not yet present in the element are copied.
+         *
+         * @param recipient - Element to copy attributes into.
+         * @param attrs - Attributes to copy.
+         */
+        adoptAttributes(recipient: AST.Element, attrs: AST.Default.Attribute[]): void;
+        /**
+         * Returns the first child of the given node.
+         *
+         * @param node - Node.
+         */
+        getFirstChild(node: AST.ParentNode): AST.Node;
+        /**
+         * Returns the given node's children in an array.
+         *
+         * @param node - Node.
+         */
+        getChildNodes(node: AST.ParentNode): AST.Node[];
+        /**
+         * Returns the given node's parent.
+         *
+         * @param node - Node.
+         */
+        getParentNode(node: AST.Node): AST.ParentNode;
+        /**
+         * Returns the given element's attributes in an array, in the form of name-value pairs.
+         * Foreign attributes may contain `namespace` and `prefix` fields as well.
+         *
+         * @param element - Element.
+         */
+        getAttrList(element: AST.Element): AST.Default.Attribute[];
+        /**
+         * Returns the given element's tag name.
+         *
+         * @param element - Element.
+         */
+        getTagName(element: AST.Element): string;
+        /**
+         * Returns the given element's namespace.
+         *
+         * @param element - Element.
+         */
+        getNamespaceURI(element: AST.Element): string;
+        /**
+         * Returns the given text node's content.
+         *
+         * @param textNode - Text node.
+         */
+        getTextNodeContent(textNode: AST.TextNode): string;
+        /**
+         * Returns the given comment node's content.
+         *
+         * @param commentNode - Comment node.
+         */
+        getCommentNodeContent(commentNode: AST.CommentNode): string;
+        /**
+         * Returns the given document type node's name.
+         *
+         * @param doctypeNode - Document type node.
+         */
+        getDocumentTypeNodeName(doctypeNode: AST.DocumentType): string;
+        /**
+         * Returns the given document type node's public identifier.
+         *
+         * @param doctypeNode - Document type node.
+         */
+        getDocumentTypeNodePublicId(doctypeNode: AST.DocumentType): string;
+        /**
+         * Returns the given document type node's system identifier.
+         *
+         * @param doctypeNode - Document type node.
+         */
+        getDocumentTypeNodeSystemId(doctypeNode: AST.DocumentType): string;
+        /**
+         * Determines if the given node is a text node.
+         *
+         * @param node - Node.
+         */
+        isTextNode(node: AST.Node): boolean;
+        /**
+         * Determines if the given node is a comment node.
+         *
+         * @param node - Node.
+         */
+        isCommentNode(node: AST.Node): boolean;
+        /**
+         * Determines if the given node is a document type node.
+         *
+         * @param node - Node.
+         */
+        isDocumentTypeNode(node: AST.Node): boolean;
+        /**
+         * Determines if the given node is an element.
+         *
+         * @param node - Node.
+         */
+        isElementNode(node: AST.Node): boolean;
+    }
+}
+
+
+// Included tree adapters
+//-----------------------------------------------------------------------------------
+
+/**
+ * Provides built-in tree adapters that can be used for parsing and serialization.
+ *
+ * @example
+ *```js
+ *
+ * const parse5 = require('parse5');
+ *
+ * // Uses the default tree adapter for parsing.
+ * const document = parse5.parse('<div></div>', {
+ *     treeAdapter: parse5.treeAdapters.default
+ * });
+ *
+ * // Uses the htmlparser2 tree adapter with the SerializerStream.
+ * const serializer = new parse5.SerializerStream(node, {
+ *     treeAdapter: parse5.treeAdapters.htmlparser2
+ * });
+ * ```
+ */
+export var treeAdapters: {
+    /**
+     * Default tree format for parse5.
+     */
+    default: AST.TreeAdapter,
+    /**
+     * Quite popular [htmlparser2](https://github.com/fb55/htmlparser2) tree format
+     * (e.g. used by [cheerio](https://github.com/MatthewMueller/cheerio) and [jsdom](https://github.com/tmpvar/jsdom)).
+     */
+    htmlparser2: AST.TreeAdapter
+};
+
+
+// Shorthand methods
+//-----------------------------------------------------------------------------------
+
+/**
+ * Parses an HTML string.
+ *
+ * @param html - Input HTML string.
+ * @param options - Parsing options.
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ *
+ * const document = parse5.parse('<!DOCTYPE html><html><head></head><body>Hi there!</body></html>');
+ *
+ * console.log(document.childNodes[1].tagName); //> 'html'
+ * ```
+ */
+export function parse(html: string, options?: Options.ParserOptions): AST.Document;
+
+/**
+ * Parses an HTML fragment.
+ *
+ * @param fragmentContext - Parsing context element. If specified, given fragment will be parsed as if it was set to the context element's `innerHTML` property.
+ * @param html - Input HTML fragment string.
+ * @param options - Parsing options.
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ *
+ * const documentFragment = parse5.parseFragment('<table></table>');
+ *
+ * console.log(documentFragment.childNodes[0].tagName); //> 'table'
+ *
+ * // Parses the html fragment in the context of the parsed <table> element.
+ * const trFragment = parser.parseFragment(documentFragment.childNodes[0], '<tr><td>Shake it, baby</td></tr>');
+ *
+ * console.log(trFragment.childNodes[0].childNodes[0].tagName); //> 'td'
+ * ```
+ */
+export function parseFragment(fragmentContext: AST.Element, html: string, options?: Options.ParserOptions): AST.DocumentFragment;
+export function parseFragment(html: string, options?: Options.ParserOptions): AST.DocumentFragment;
+
+/**
+ * Serializes an AST node to an HTML string.
+ *
+ * @param node - Node to serialize.
+ * @param options - Serialization options.
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ *
+ * const document = parse5.parse('<!DOCTYPE html><html><head></head><body>Hi there!</body></html>');
+ *
+ * // Serializes a document.
+ * const html = parse5.serialize(document);
+ *
+ * // Serializes the <html> element content.
+ * const str = parse5.serialize(document.childNodes[1]);
+ *
+ * console.log(str); //> '<head></head><body>Hi there!</body>'
+ * ```
+ */
+export function serialize(node: AST.Node, options?: Options.SerializerOptions): string;
+
+
+// Parser stream
+//-----------------------------------------------------------------------------------
+
+/**
+ * Streaming HTML parser with scripting support.
+ * A [writable stream](https://nodejs.org/api/stream.html#stream_class_stream_writable).
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ * const http = require('http');
+ *
+ * // Fetch the page content and obtain it's <head> node
+ * http.get('http://inikulin.github.io/parse5/', res => {
+ *    const parser = new parse5.ParserStream();
+ *
+ *    parser.once('finish', () => {
+ *        console.log(parser.document.childNodes[1].childNodes[0].tagName); //> 'head'
+ *    });
+ *
+ *    res.pipe(parser);
+ * });
+ * ```
+ */
+export class ParserStream extends stream.Writable {
+    /**
+     * @param options - Parsing options.
+     */
+    constructor(options?: Options.ParserOptions);
+
+    /**
+     * The resulting document node.
+     */
+    document: AST.Document;
+
+    /**
+     * Raised then parser encounters a `<script>` element.
+     * If this event has listeners, parsing will be suspended once it is emitted.
+     * So, if `<script>` has the `src` attribute, you can fetch it, execute and then resume parsing just like browsers do.
+     *
+     * @param listener.scriptElement - The script element that caused the event.
+     * @param listener.documentWrite - Write additional `html` at the current parsing position. Suitable for implementing the DOM `document.write` and `document.writeln` methods.
+     * @param listener.documentWrite.html - HTML to write.
+     * @param listener.resume - Resumes parsing.
+     *
+     * @example
+     * ```js
+     *
+     * const parse = require('parse5');
+     * const http = require('http');
+     *
+     * const parser = new parse5.ParserStream();
+     *
+     * parser.on('script', (scriptElement, documentWrite, resume) => {
+     *     const src = parse5.treeAdapters.default.getAttrList(scriptElement)[0].value;
+     *
+     *     http.get(src, res => {
+     *        // Fetch the script content, execute it with DOM built around `parser.document` and
+     *        // `document.write` implemented using `documentWrite`.
+     *        ...
+     *        // Then resume parsing.
+     *        resume();
+     *     });
+     * });
+     *
+     * parser.end('<script src="example.com/script.js"></script>');
+     * ```
+     */
+    on(event: 'script', listener: (scriptElement: AST.Element, documentWrite: (html: string) => void, resume: () => void) => void): this;
+    /**
+     * WritableStream events
+     */
+    on(event: string, listener: Function): this;
+}
+
+
+// Plaint text conversion stream
+//-----------------------------------------------------------------------------------
+
+/**
+ * Converts plain text files into HTML document as required by [HTML specification](https://html.spec.whatwg.org/#read-text).
+ * A [writable stream](https://nodejs.org/api/stream.html#stream_class_stream_writable).
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ * const fs = require('fs');
+ *
+ * const file = fs.createReadStream('war_and_peace.txt');
+ * const converter = new parse5.PlainTextConversionStream();
+ *
+ * converter.once('finish', () => {
+ *     console.log(converter.document.childNodes[1].childNodes[0].tagName); //> 'head'
+ * });
+ *
+ * file.pipe(converter);
+ * ```
+ */
+export class PlainTextConversionStream extends ParserStream { }
+
+
+// SAX parser
+//-----------------------------------------------------------------------------------
+/**
+ * Streaming [SAX](https://en.wikipedia.org/wiki/Simple_API_for_XML)-style HTML parser.
+ * A [transform stream](https://nodejs.org/api/stream.html#stream_class_stream_transform)
+ * (which means you can pipe *through* it, see example).
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ * const http = require('http');
+ * const fs = require('fs');
+ *
+ * const file = fs.createWriteStream('/home/google.com.html');
+ * const parser = new parse5.SAXParser();
+ *
+ * parser.on('text', text => {
+ *    // Handle page text content
+ *    ...
+ * });
+ *
+ * http.get('http://google.com', res => {
+ *    // SAXParser is the Transform stream, which means you can pipe
+ *    // through it. So, you can analyze page content and, e.g., save it
+ *    // to the file at the same time:
+ *    res.pipe(parser).pipe(file);
+ * });
+ * ```
+ */
+export class SAXParser extends stream.Transform {
+    /**
+     * @param options - Parsing options.
+     */
+    constructor(options?: Options.SAXParserOptions);
+
+    /**
+     * Raised when the parser encounters a start tag.
+     *
+     * @param listener.name - Tag name.
+     * @param listener.attrs - List of attributes.
+     * @param listener.selfClosing - Indicates if the tag is self-closing.
+     * @param listener.location - Start tag source code location info. Available if location info is enabled via {@link Options.SAXParserOptions}.
+     */
+    on(event: 'startTag', listener: (name: string, attrs: AST.Default.Attribute[], selfClosing: boolean, location?: MarkupData.StartTagLocation) => void): this;
+    /**
+     * Raised then parser encounters an end tag.
+     *
+     * @param listener.name - Tag name.
+     * @param listener.location - End tag source code location info. Available if location info is enabled via {@link Options.SAXParserOptions}.
+     */
+    on(event: 'endTag', listener: (name: string, location?: MarkupData.Location) => void): this;
+    /**
+     * Raised then parser encounters a comment.
+     *
+     * @param listener.text - Comment text.
+     * @param listener.location - Comment source code location info. Available if location info is enabled via {@link Options.SAXParserOptions}.
+     */
+    on(event: 'comment', listener: (text: string, location?: MarkupData.Location) => void): this;
+    /**
+     * Raised then parser encounters text content.
+     *
+     * @param listener.text - Text content.
+     * @param listener.location - Text content code location info. Available if location info is enabled via {@link Options.SAXParserOptions}.
+     */
+    on(event: 'text', listener: (text: string, location?: MarkupData.Location) => void): this;
+    /**
+     * Raised then parser encounters a [document type declaration](https://en.wikipedia.org/wiki/Document_type_declaration).
+     *
+     * @param listener.name - Document type name.
+     * @param listener.publicId - Document type public identifier.
+     * @param listener.systemId - Document type system identifier.
+     * @param listener.location - Document type declaration source code location info. Available if location info is enabled via {@link Options.SAXParserOptions}.
+     */
+    on(event: 'doctype', listener: (name: string, publicId: string, systemId: string, location?: MarkupData.Location) => void): this;
+    /**
+     * TransformStream events
+     */
+    on(event: string, listener: Function): this;
+
+    /**
+     * Stops parsing. Useful if you want the parser to stop consuming CPU time once you've obtained the desired info
+     * from the input stream. Doesn't prevent piping, so that data will flow through the parser as usual.
+     *
+     * @example
+     * ```js
+     *
+     * const parse5 = require('parse5');
+     * const http = require('http');
+     * const fs = require('fs');
+     *
+     * const file = fs.createWriteStream('google.com.html');
+     * const parser = new parse5.SAXParser();
+     *
+     * parser.on('doctype', (name, publicId, systemId) => {
+     *    // Process doctype info ans stop parsing
+     *    ...
+     *    parser.stop();
+     * });
+     *
+     * http.get('http://google.com', res => {
+     *    // Despite the fact that parser.stop() was called whole
+     *    // content of the page will be written to the file
+     *    res.pipe(parser).pipe(file);
+     * });
+     * ```
+     */
+    stop(): void;
+}
+
+
+// Serializer stream
+//-----------------------------------------------------------------------------------
+
+/**
+ * Streaming AST node to an HTML serializer.
+ * A [readable stream](https://nodejs.org/api/stream.html#stream_class_stream_readable).
+ *
+ * @example
+ * ```js
+ *
+ * const parse5 = require('parse5');
+ * const fs = require('fs');
+ *
+ * const file = fs.createWriteStream('/home/index.html');
+ *
+ * // Serializes the parsed document to HTML and writes it to the file.
+ * const document = parse5.parse('<body>Who is John Galt?</body>');
+ * const serializer = new parse5.SerializerStream(document);
+ *
+ * serializer.pipe(file);
+ * ```
+ */
+export class SerializerStream extends stream.Readable {
+    /**
+     * Streaming AST node to an HTML serializer. A readable stream.
+     *
+     * @param node - Node to serialize.
+     * @param options - Serialization options.
+     */
+    constructor(node: AST.Node, options?: Options.SerializerOptions);
+}
diff --git a/types/parse5/v4/parse5-tests.ts b/types/parse5/v4/parse5-tests.ts
new file mode 100644
index 0000000000..70a7b370f2
--- /dev/null
+++ b/types/parse5/v4/parse5-tests.ts
@@ -0,0 +1,89 @@
+import * as parse5 from "parse5";
+
+// Shorthands
+// parse
+const document = parse5.parse("<html>");
+
+document; // $ExpectType Document
+
+const defaultAdapter = new Object() as parse5.AST.TreeAdapter;
+
+parse5.parse("<html>", {}); // $ExpectType Document
+parse5.parse("<html>", { treeAdapter: defaultAdapter }); // $ExpectType Document
+
+let opt = {
+    sourceCodeLocationInfo: true,
+    scriptingEnabled: false,
+    treeAdapter: defaultAdapter
+};
+
+parse5.parse("<html>", opt); // $ExpectType Document
+
+opt = {
+    sourceCodeLocationInfo: true,
+    scriptingEnabled: false,
+    treeAdapter: defaultAdapter
+};
+
+parse5.parse("<html>", opt); // $ExpectType Document
+
+// parseFragment
+const fragment = parse5.parseFragment("<div>");
+
+fragment; // $ExpectType DocumentFragment
+
+parse5.parseFragment("<div>", {});
+parse5.parseFragment("<div>", { treeAdapter: defaultAdapter });
+
+const element = (parse5.parseFragment(
+    "<div>"
+)) as parse5.AST.Element;
+
+parse5.parseFragment(element, "<div>");
+parse5.parseFragment(element, "<div>", {});
+parse5.parseFragment(element, "<div>", {
+    treeAdapter: defaultAdapter
+});
+
+// serialize
+const html = parse5.serialize(element);
+
+html; // $ExpectType string
+
+parse5.serialize(element, { treeAdapter: defaultAdapter });
+parse5.serialize(element, { treeAdapter: defaultAdapter });
+
+
+const adapter = defaultAdapter;
+
+adapter.createDocument(); // $ExpectType Document
+adapter.createDocumentFragment(); // $ExpectType DocumentFragment
+adapter.createElement("div", "namespace", [{ name: "someAttr", value: "42" }]); // $ExpectType Element
+adapter.createCommentNode("foo"); // $ExpectType CommentNode
+
+adapter.appendChild(document, element);
+adapter.insertBefore(document, element, element);
+adapter.setTemplateContent(element, fragment);
+
+adapter.getTemplateContent(element); // $ExpectType DocumentFragment
+
+adapter.setDocumentType(document, "name", "publicId", "systemId");
+adapter.setDocumentMode(document, "quirks");
+
+adapter.getDocumentMode(document); // $ExpectType DocumentMode
+
+adapter.detachNode(element);
+adapter.insertText(element, "text");
+adapter.insertTextBefore(document, "text", element);
+adapter.adoptAttributes(element, [{ name: "someAttr", value: "42" }]);
+
+adapter.getFirstChild(element); // $ExpectType Node
+adapter.getChildNodes(element)[0]; // $ExpectType Node
+adapter.getParentNode(element); // $ExpectType ParentNode
+adapter.getAttrList(element)[0]; // $ExpectType Attribute
+adapter.getTagName(element); // $ExpectType string
+adapter.getNamespaceURI(element); // $ExpectType string
+adapter.isTextNode(element); // $ExpectType boolean
+adapter.isCommentNode(element); // $ExpectType boolean
+adapter.isDocumentTypeNode(element); // $ExpectType boolean
+adapter.isElementNode(element); // $ExpectType boolean
diff --git a/types/parse5/v4/tsconfig.json b/types/parse5/v4/tsconfig.json
new file mode 100644
index 0000000000..97e1cf7849
--- /dev/null
+++ b/types/parse5/v4/tsconfig.json
@@ -0,0 +1,26 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../../",
+        "typeRoots": [
+            "../../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "paths": {
+            "parse5": [ "parse5/v4" ]
+        }
+    },
+    "files": [
+        "index.d.ts",
+        "parse5-tests.ts"
+    ]
+}
diff --git a/types/parse5/v4/tslint.json b/types/parse5/v4/tslint.json
new file mode 100644
index 0000000000..7646a8bd15
--- /dev/null
+++ b/types/parse5/v4/tslint.json
@@ -0,0 +1,17 @@
+{
+    "extends": "dtslint/dt.json",
+    "rules": {
+        "comment-format": false,
+        "strict-export-declare-modifiers": false,
+        "semicolon": false,
+        "max-line-length": false,
+        "no-consecutive-blank-lines": false,
+        "typedef-whitespace": false,
+        "whitespace": false,
+        "ban-types": false,
+        "no-unnecessary-qualifier": false,
+        "jsdoc-format": false,
+        "no-var-keyword": false,
+        "unified-signatures": false
+    }
+}