diff --git a/base-64/index.d.ts b/base-64/index.d.ts
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+++ b/base-64/index.d.ts
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+// Type definitions for base-64 0.1.0
+// Project: https://github.com/mathiasbynens/base64
+// Definitions by: Dolan Miu <https://github.com/dolanmiu>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+declare module 'base-64' {
+interface base64static {
+    /**
+     * A string representing the semantic version number.
+     */
+    version: string;
+    
+    /**
+     * This function takes a byte string (the input parameter) and encodes it according to base64. 
+     * The input data must be in the form of a string containing only characters 
+     * in the range from U+0000 to U+00FF, each representing a binary byte with values 0x00 to 0xFF. 
+     * The base64.encode() function is designed to be fully compatible 
+     * with btoa() as described in the HTML Standard.
+     * see: https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-btoa
+     */
+    encode(input: string): string;
+    
+    /**
+     * This function takes a base64-encoded string (the input parameter) and decodes it. 
+     * The return value is in the form of a string containing only characters in 
+     * the range from U+0000 to U+00FF, each representing a binary byte with values 0x00 to 0xFF. 
+     * The base64.decode() function is designed to be fully compatible 
+     * with atob() as described in the HTML Standard.
+     * see: https://html.spec.whatwg.org/multipage/webappapis.html#dom-windowbase64-atob
+     */
+    decode(input: string): string;
+}
+
+var base64: base64static;
+
+export = base64;
+}