diff --git a/README.md b/README.md
index 0bc474e..584c627 100644
--- a/README.md
+++ b/README.md
@@ -233,6 +233,14 @@ describe('concat.js', function () {
 
 ```
 
+## TypeScript
+To use with TypeScript, just import it like this:
+```ts
+import env from 'get-env';
+
+const stringVar = env('STRING').required().asString();
+```
+
 ## Contributors
 * @MikeyBurkman
 * @itavy
diff --git a/env-var.d.ts b/env-var.d.ts
index 5d24c86..81fb5a5 100644
--- a/env-var.d.ts
+++ b/env-var.d.ts
@@ -1,22 +1,33 @@
 
-declare function E (varName: string, defaultValue?: string): E.IVariable;
-
-declare namespace E {
-
-  interface IVariable {
-    required: () => IVariable,
-    asInt: () => number,
-    asFloat: () => number,
-    asPositiveInt: () => number,
-    asNegativeInt: () => number,
-    asString: () => string,
-    asJson: () => Object|Array<any>,
-    asBool: () => boolean,
-    asStrictBool: () => boolean,
-  }
+export interface IPresentVariable {
+  asFloat: () => number;
+  asInt: () => number;
+  asPositiveInt: () => number;
+  asNegativeInt: () => number;
+  asString: () => string;
+  asJson: () => Object|Array<any>;
+  asBool: () => boolean;
+  asStrictBool: () => boolean;
+}
 
-  function mock (mockValues: Object): (varName: string, defaultValue?: string) => E.IVariable;
+export interface IOptionalVariable {
+  required: () => IPresentVariable;
+  asFloat: () => number|undefined;
+  asInt: () => number|undefined;
+  asPositiveInt: () => number|undefined;
+  asNegativeInt: () => number|undefined;
+  asString: () => string|undefined;
+  asJson: () => Object|Array<any>|undefined;
+  asBool: () => boolean|undefined;
+  asStrictBool: () => boolean|undefined;
+}
 
+export interface IEnv {
+  (): Object,
+  (varName: string): IOptionalVariable;
+  (varName: string, defaultValue: string): IPresentVariable;
+  mock(mockVars: Object): IEnv;
 }
 
-export = E;
+export const env: IEnv;
+export default env;
diff --git a/package.json b/package.json
index c9ee611..17e8693 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,10 @@
   ],
   "author": "Evan Shortiss",
   "license": "MIT",
-  "files": ["lib/", "env-var.d.ts"],
+  "files": [
+    "lib/",
+    "env-var.d.ts"
+  ],
   "bugs": {
     "url": "https://github.com/evanshortiss/env-var/issues"
   },