Fix for Jest tests failing with typescript

Summary: Tests were failing as they were not being transformed correctly. Class properties (proposed syntax) was only partially added for Typescript files. This fixes the issue.

Reviewed By: passy

Differential Revision: D16686613

fbshipit-source-id: 2108cf77eb688bb6825d016960480ea55fcc2620

static/transforms/index.js

@@ -47,6 +47,7 @@ function transform({filename, options, src}) {
     plugins.push(
       require('../node_modules/@babel/plugin-transform-typescript'),
       require('../node_modules/@babel/plugin-transform-modules-commonjs'),
+      require('../node_modules/@babel/plugin-proposal-class-properties'),
     );
   }