Rename external modules to index.d.ts

absolute/index.d.ts

@@ -3,7 +3,6 @@
 // Definitions by: Aya Morisawa <https://github.com/AyaMorisawa>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-
 /**
  * Test if a path is absolute
  */

acorn/index.d.ts

@@ -5,6 +5,9 @@
 
 /// <reference path="../estree/estree.d.ts" />
 
+export as namespace acorn;
+export = acorn;
+
 declare namespace acorn {
     var version: string;
     function parse(input: string, options?: Options): ESTree.Program;
@@ -62,7 +65,3 @@ declare namespace acorn {
         plugins?: { [name: string]: Function; };
     }
 }
-
-declare module "acorn" {
-    export = acorn
-}