Add escape-html definition file

escape-html/escape-html-tests.ts

@@ -0,0 +1,5 @@
+/// <reference path="./escape-html.d.ts" />
+
+import * as escapeHTML from "escape-html";
+
+const result = escapeHTML("foo & bar");

escape-html/escape-html.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for escape-html
+// Project: https://github.com/component/escape-html
+// Definitions by: Elisée MAURER <https://github.com/elisee/>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module "escape-html" {
+  function escapeHTML(text: string): string;
+  namespace escapeHTML {}
+
+  export = escapeHTML;
+}