Add HtmlFormatter typings to expose showUnchanged and hideUnchanged

Author: ian-craig

src/index.d.ts

@@ -1,5 +1,22 @@
 export interface Formatter {
-  format(delta: Delta, original: any): string;
+    format(delta: Delta, original: any): string;
+}
+
+export interface HtmlFormatter extends Formatter {
+    /**
+     * Set whether to show or hide unchanged parts of a diff.
+     * @param show Whether to show unchanged parts
+     * @param node The root element the diff is contained within. (Default: body)
+     * @param delay Transition time in ms. (Default: no transition)
+     */
+    showUnchanged(show: boolean, node?: Element | null, delay?: number): void;
+
+    /**
+     * An alias for showUnchanged(false, ...)
+     * @param node The root element the diff is contained within (Default: body)
+     * @param delay Transition time in ms. (Default: no transition)
+     */
+    hideUnchanged(node?: Element | null, delay?: number): void;
 }
 
 export interface Delta {
@@ -52,9 +69,9 @@ export class DiffPatcher {
 }
 
 export const formatters: {
-  annotated: Formatter;
-  console: Formatter;
-  html: Formatter;
+    annotated: Formatter;
+    console: Formatter;
+    html: HtmlFormatter;
 };
 
 export const console: Formatter