diff --git a/package.json b/package.json
index 590a721..1174e59 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "url": "http://github.com/vkiryukhin/pretty-data.git"
   },
   "main":"./pretty-data",
+  "types": "pretty-data.d.ts",
   "keywords": [
 	"pretty print",
 	"beautify",
diff --git a/pretty-data.d.ts b/pretty-data.d.ts
new file mode 100644
index 0000000..6283251
--- /dev/null
+++ b/pretty-data.d.ts
@@ -0,0 +1,10 @@
+export namespace pd {
+  export function xml(data: string): string;
+  export function json(data: string): string;
+  export function css(data: string): string;
+  export function sql(data: string): string;
+  export function xmlmin(data: string, preserveComments?: boolean): string;
+  export function jsonmin(data: string): string;
+  export function cssmin(data: string, preserveComments?: boolean): string;
+  export function sqlmin(data: string): string;
+}