foo.js

/** @jsx React.DOM */

var SWF = React.createClass({
  componentDidMount: function() {
    var newNode = document.createElement('div');
    var myNode = this.getDOMNode();
    myNode.appendChild(newNode);
    swfobject.embedSWF(this.props.file, newNode);
  },

  render: function() {
    return <div />;
  }
});
 
React.renderComponent(<SWF file ="path/to/file.swf" />, document.body);