code: function (f, comp) {
    if ((typeof Meteor === 'undefined') || Meteor.isClient) {
      f(comp);
    } else {
      Meteor._noYieldsAllowed(function () {
        f(comp);
      });
    }
  }
docs: Like `Meteor._noYieldsAllowed(function () { f(comp); })` but shorter, and doesn't clutter the stack with an extra frame on the client, where `_noYieldsAllowed` is a no-op.  `f` may be a computation function or an onInvalidate callback.