Add prismic-dom types for version 2.1 (#34228)

* Add prismic-dom new asHtml types

* improve indentation

types/prismic-dom/index.d.ts

@@ -1,12 +1,50 @@
-// Type definitions for prismic-dom 2.0
+// Type definitions for prismic-dom 2.1
 // Project: https://github.com/prismicio/prismic-dom#readme
 // Definitions by: Nick Whyte <https://github.com/nickw444>
 //                 Siggy Bilstein <https://github.com/sbilstein>
+//                 Douglas Nomizo <https://github.com/douglasnomizo>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
+
+type ElementType =
+    | "heading1"
+    | "heading2"
+    | "heading3"
+    | "heading4"
+    | "heading5"
+    | "heading6"
+    | "paragraph"
+    | "preformatted"
+    | "strong"
+    | "em"
+    | "list-item"
+    | "o-list-item"
+    | "group-list-item"
+    | "group-o-list-item"
+    | "image"
+    | "embed"
+    | "hyperlink"
+    | "label"
+    | "span";
+
+type Elements = {[key in ElementType]: string};
+
+type HTMLSerializer<T> = (
+    type: ElementType,
+    element: any,
+    text: string | null,
+    children: T[],
+    index: number,
+) => T;
 
 interface RichText {
-    asHtml(richText: any, linkResolver?: (doc: any) => string): string;
-    asText(richText: any,  joinString?: string): string;
+    asHtml(
+        richText: any,
+        linkResolver?: (doc: any) => string,
+        serializer?: HTMLSerializer<string>,
+    ): string;
+    asText(richText: any, joinString?: string): string;
+    Elements: Elements;
 }
 
 interface Link {
@@ -15,6 +53,11 @@ interface Link {
 
 export const RichText: RichText;
 export const Link: Link;
+export const HTMLSerializer: HTMLSerializer<string>;
+
+declare const _default: {
+    RichText: RichText;
+    Link: Link
+};
 
-declare const _default: { RichText: RichText, Link: Link };
 export default _default;

types/prismic-dom/prismic-dom-tests.ts

@@ -1,3 +1,5 @@
 import prismicDom = require("prismic-dom");
 
-const rendered: string = prismicDom.RichText.asHtml({});
+const string = '';
+const rendered: string = prismicDom.RichText.asHtml({}, () => string, () => string);
+const link: string = prismicDom.Link.url({}, ({}) => string);