message: Use strict equality.
diff: @@ -155,7 +155,7 @@ function addEndpoint(widgetId, endpointUrl) {
  const endpoint = new WidgetMessageEndpoint(widgetId, endpointUrl);
  if (messageEndpoints && messageEndpoints.length > 0) {
  if (messageEndpoints.filter(function(ep) {
  - return (ep.widgetId == widgetId && ep.endpointUrl == endpointUrl);
  + return (ep.widgetId === widgetId && ep.endpointUrl === endpointUrl);
  }).length > 0) {
  // Message endpoint already registered
  return;
  @@ -204,18 +204,18 @@ function onMessage(event) {
  const action = event.data.action;
  const widgetId = event.data.widgetId;
  - if (action == 'content_loaded') {
  + if (action === 'content_loaded') {
  dis.dispatch({
  action: 'widget_content_loaded',
  widgetId: widgetId,
  });
  sendResponse(event, {success: true});
  - } else if (action == 'supported_api_versions') {
  + } else if (action === 'supported_api_versions') {
  sendResponse(event, {
  api: "widget",
  supported_versions: SUPPORTED_WIDGET_API_VERSIONS,
  });
  - } else if (action == 'api_version') {
  + } else if (action === 'api_version') {
  sendResponse(event, {
  api: "widget",
  version: WIDGET_API_VERSION,
  