Add TypeScript declarations

javascript/sources/index.wasm.js

@@ -4,18 +4,13 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @flow
  * @format
  */
 
-const wrapLib = require('./entry');
+const wrapAsm = require('./wrapAsm');
 const loadYoga = require('./wasm-async');
 
 module.exports = {
-load: () => {
-    return loadYoga().then(wrapLib);
+  load: () => loadYoga().then(wrapAsm),
+  ...require('./YGEnums'),
 }
-}
-
-export type * from './YGEnums.js';
-export type * from './entry';