formlyConfig

// object api (single type with a template)
formlyConfig.setType({
  name: 'input',
  template: '<input ng-model="[options.key]" />'
});
// with a templateUrl
formlyConfig.setType({
  name: 'checkbox',
  templateUrl: 'custom-formly-fields-checkbox.html'
});

// array api (multiple types)hi
formlyConfig.setType([
  {
    name: 'radio',
    templateUrl: 'custom-formly-fields-radio.html'
  },
  {
    name: 'button',
    templateUrl: '<button ng-click="options.templateOptions">{{options.label}}</button>'
  }
]);

formlyConfig.setType({
  name: 'childInput',
  extends: 'input',
  defaultOptions: function(options) {
    return {
      templateOptions: {
        label: options.key
      }
    };
  }
});

ngModule.constant('yourOwnCheck', apiCheck({
  output: {prefix: 'you app/lib name'}
}));
ngModule.run(function(formlyConfig, yourOwnCheck) {
  formlyConfig.setType({
    name: 'input',
    template: '<input class="to.className" ng-model="model[options.key]" />',
    apiCheck: {
      templateOptions: yourOwnCheck.shape({
        className: yourOwnCheck.string
      })
    },
    apiCheckInstance: yourOwnCheck
  });
});

// object api
formlyConfigProvider.setWrapper({
  name: 'inputWrapper', // optional. Defaults to name || types.join(' ') || 'default'
  template: 'the template with <formly-transclude></formly-transclude> in it', // must have this OR templateUrl
  templateUrl: 'path/to/template.html', // the resulting template MUST have <formly-transclude></formly-transclude> in it and must have templateUrl OR template (not both)
  types: 'stringOrArray' // this can be a string or an array of strings that map to types specified by setTemplate and setTemplateUrl
});

// array api
formlyConfigProvider.setWrapper([
  { /* same configuration as the object api */ },
  { /* same configuration as the object api */ },
  { /* same configuration as the object api */ },
  { /* same configuration as the object api */ }
]);

formlyConfig.templateManipulators.preWrapper.push(function(template, options, scope) {
  // determine if you wish to do anything with this template,
  // manipulated as needed, and return either the old template,
  // the new template, or a promise that will resolve with the
  // new template... for example
  if (options.data.addWarningMessage) {
    return template + '<div>This is a warning message!!!</div>';
  } else {
    return template;
  }
});

// or, if you wanted to load a template, you would
// use $http, and $templateCache, then do:
formlyConfig.templateManipulators.preWrapper.push(function(template, options, scope) {
  return $http.get('the/template.html', {cache: $templateCache}).then(function(response) {
    return response.data.replace('where-the-template-goes', template);
  });
});