@metadonors/gatsby-plugin-gtag/gatsby-ssr.js

Gatsby plugin to add Google Analytics gtag.js (replacement for analytics.js) to a site. Includes Outbound Links.

'use strict';

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var GTAG_SRC = 'https://www.googletagmanager.com/gtag/js';

exports.onRenderBody = function (_ref, pluginOptions) {
  var setHeadComponents = _ref.setHeadComponents,
      setPostBodyComponents = _ref.setPostBodyComponents;

  var isPluginEnabled = stringToBool(process.env.GATSBY_GTAG_DEBUG) || process.env.NODE_ENV === 'production';

  if (!pluginOptions.trackingId || !isPluginEnabled) {
    return null;
  }

  var anonymize = pluginOptions.anonymize || false;
  var optimizeId = pluginOptions.optimizeId || false;

  var gtagScript = _react2.default.createElement('script', {
    async: true,
    key: 'gatsby-plugin-gtag-gtag-js',
    src: GTAG_SRC + '?id=' + pluginOptions.trackingId
  });

  var scriptStr = '\n    window.GATSBY_GTAG_PLUGIN_GA_TRACKING_ID = (\n      \'' + pluginOptions.trackingId + '\'\n    );\n    window.GATSBY_GTAG_PLUGIN_GA_OPTIMIZE_ID = (\n      \'' + pluginOptions.optimizeId + '\'\n    );\n    window.GATSBY_GTAG_PLUGIN_ANONYMIZE = ' + anonymize + ';\n\n    var options = {\n      send_page_view: false,\n      optimizeId: \'' + optimizeId + '\'\n    };\n    if (' + anonymize + ') {\n      options.anonymize_ip = true;\n    }\n\n    window.dataLayer = window.dataLayer || [];\n    function gtag(){dataLayer.push(arguments);}\n    window.gtag = gtag;\n    gtag(\'js\', new Date());\n    gtag(\'config\', \'' + pluginOptions.trackingId + '\', options);\n  ';
  var trackScript = _react2.default.createElement('script', {
    key: 'gatsby-plugin-gtag-inline-script',
    dangerouslySetInnerHTML: { __html: scriptStr }
  });

  var setComponents = pluginOptions.head ? setHeadComponents : setPostBodyComponents;

  return setComponents([gtagScript, trackScript]);
};

function stringToBool(s) {
  if (!s) {
    return false;
  }

  var sNorm = s.trim().toLowerCase();
  if (!sNorm.length) {
    return false;
  }

  return sNorm === 'true' || sNorm === '1';
}