es-dev-server/dist/browser-scripts/message-channel.js

Development server for modern web apps

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const constants_1 = require("../constants");
exports.default = `
  <script>
    // sets up a message channel with es-dev-server to receive events
    // for reloading the browser on file change or logging errors
    (function () {
      if (!('EventSource' in window)) {
        return;
      }

      var eventSource = new EventSource('${constants_1.messageChannelEndpoint}');
      var reloading = false;

      eventSource.addEventListener('reload', function (e) {
        reloading = true;
        location.reload();
      });

      eventSource.addEventListener('error-message', function (e) {
        if (reloading) {
          return;
        }
        
        console.error(JSON.parse(e.data));
      });

      eventSource.addEventListener('error', function () {
        if (reloading) {
          return;
        }

        eventSource.close();
        setTimeout(function () {
          console.log('Disconnected from es-dev-server, no longer reloading on file changes.');
        }, 300);
      });
    }());
  </script>
</body>
`;
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