diff --git a/src/lib/html-formatter.d.ts b/src/lib/html-formatter.d.ts
new file mode 100644
index 0000000..e0f4faa
--- /dev/null
+++ b/src/lib/html-formatter.d.ts
@@ -0,0 +1,8 @@
+// HTML Formatter type declarations
+
+export function closing(el: string): string;
+export function entity(el: string): string;
+export function minify(el: string): string;
+export function render(el: string, opt?: any): string;
+
+export default render;