String _requireJsConfig()

in build_web_compilers/lib/src/dev_compiler_bootstrap.dart [409:453]

• 41 lines of code
• 12 McCabe index (conditional complexity)

String _requireJsConfig(bool soundNullSafety) => '''
// Whenever we fail to load a JS module, try to request the corresponding
// `.errors` file, and log it to the console.
(function() {
  var oldOnError = requirejs.onError;
  requirejs.onError = function(e) {
    if (e.requireModules) {
      if (e.message) {
        // If error occurred on loading dependencies, we need to invalidate ancessor too.
        var ancesor = e.message.match(/needed by: (.*)/);
        if (ancesor) {
          e.requireModules.push(ancesor[1]);
        }
      }
      for (const module of e.requireModules) {
        var errorCallbacks = \$dartLoader.moduleLoadingErrorCallbacks.get(module);
        if (errorCallbacks) {
          for (const callback of errorCallbacks) callback(e);
          errorCallbacks.clear();
        }
      }
    }
    if (e.originalError && e.originalError.srcElement) {
      var xhr = new XMLHttpRequest();
      xhr.onreadystatechange = function() {
        if (this.readyState == 4) {
          var message;
          if (this.status == 200) {
            message = this.responseText;
          } else {
            message = "Unknown error loading " + e.originalError.srcElement.src;
          }
          console.error(message);
          var errorEvent = new CustomEvent(
            'dartLoadException', { detail: message });
          window.dispatchEvent(errorEvent);
        }
      };
      xhr.open("GET", e.originalError.srcElement.src + ".errors", true);
      xhr.send();
    }
    // Also handle errors the normal way.
    if (oldOnError) oldOnError(e);
  };
}());