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Tried to wrap it with webpack. This is what I get now:

function 'handler': transaction.js(17009,30): referenced
      function '__webpack_require__': transaction.js(16921,38): which captured
        variable '__webpack_modules__' which indirectly referenced
          '(module, __unused_webpack_exports, _ ...': transaction.js(332,7): which could not be serialized because
            Unexpected missing variable in closure environment: XMLHttpRequest