Add typings for second argment of demangle (AssemblyScript#385)

Author: kazupon

lib/loader/README.md

@@ -23,7 +23,7 @@ API
 * **instantiateStreaming**<`T`>(response: `Response`, imports?: `WasmImports`): `Promise<ASUtil & T>`<br />
   Instantiates an AssemblyScript module from a response using the specified imports.
 
-* **demangle**<`T`>(exports: `WasmExports`): `T`<br />
+* **demangle**<`T`>(exports: `WasmExports`, baseModule?: `Object`): `T`<br />
   Demangles an AssemblyScript module's exports to a friendly object structure. You usually don't have to call this manually as instantiation does this implicitly.
 
 **Note:** `T` above can either be omitted if the structure of the module is unknown, or can reference a `.d.ts` (i.e. `typeof MyModule`) as produced by the compiler with the `-d` option.

lib/loader/index.d.ts

@@ -83,4 +83,4 @@ export declare function instantiateBuffer<T extends {}>(buffer: Uint8Array, impo
 export declare function instantiateStreaming<T extends {}>(result: Promise<Response>, imports?: ImportsObject): Promise<ASUtil & T>;
 
 /** Demangles an AssemblyScript module's exports to a friendly object structure. */
-export declare function demangle<T extends {}>(exports: {}): T;
+export declare function demangle<T extends {}>(exports: {}, baseModule?: {}): T;