function addMethods(worker, methods) {
  var c = 0;
  var callbacks = {};
  worker.addEventListener('message', function (e) {
    var d = e.data;
    if (d.type !== 'RPC') return;

    if (d.id) {
      var f = callbacks[d.id];

      if (f) {
        delete callbacks[d.id];

        if (d.error) {
          f[1](Object.assign(Error(d.error.message), d.error));
        } else {
          f[0](d.result);
        }
      }
    } else {
      var evt = document.createEvent('Event');
      evt.initEvent(d.method, false, false);
      evt.data = d.params;
      worker.dispatchEvent(evt);
    }
  });
  methods.forEach(function (method) {
    worker[method] = function () {
      var _arguments = arguments;
      return new Promise(function (a, b) {
        var id = ++c;
        callbacks[id] = [a, b];
        worker.postMessage({
          type: 'RPC',
          id: id,
          method: method,
          params: [].slice.call(_arguments)
        });
      });
    };
  });
}

module.exports = addMethods;
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