[Alerting] Adds lazy loading to AlertType and Flyout components

x-pack/plugins/triggers_actions_ui/README.md

@@ -69,13 +69,13 @@ export function getAlertType(): AlertTypeModel {
     id: '.index-threshold',
     name: 'Index threshold',
     iconClass: 'alert',
-    alertParamsExpression: IndexThresholdAlertTypeExpression,
+    alertParamsExpression: lazy(() => import('./index_threshold_expression')),
     validate: validateAlertType,
   };
 }
 ```
 
-alertParamsExpression form represented as an expression using `EuiExpression` components:
+alertParamsExpression should be a lazy loaded React component extending an expression using `EuiExpression` components:
 ![Index Threshold Alert expression form](https://i.imgur.com/Ysk1ljY.png)
 
 ```
@@ -171,6 +171,7 @@ export const alertReducer = (state: any, action: AlertReducerAction) => {
 
 ```
 
+The Expression component should be lazy loaded which means it'll have to be the default export in `index_threshold_expression.ts`:
 
 ```
 export const IndexThresholdAlertTypeExpression: React.FunctionComponent<IndexThresholdProps> = ({
@@ -224,6 +225,9 @@ export const IndexThresholdAlertTypeExpression: React.FunctionComponent<IndexThr
       </Fragment>
   );
 };
+
+// Export as default in order to support lazy loading
+export {IndexThresholdAlertTypeExpression as default};
 ```
 
 Index Threshold Alert form with validation:
@@ -237,7 +241,9 @@ Each alert type should be defined as `AlertTypeModel` object with the these prop
   name: string;
   iconClass: string;
   validate: (alertParams: any) => ValidationResult;
-  alertParamsExpression: React.FunctionComponent<any>;
+  alertParamsExpression: React.LazyExoticComponent<
+        ComponentType<AlertTypeParamsExpressionProps<AlertParamsType, AlertsContextValue>>
+      >;
   defaultActionMessage?: string;
 ```
 |Property|Description|
@@ -246,7 +252,7 @@ Each alert type should be defined as `AlertTypeModel` object with the these prop
 |name|Name of the alert type that will be displayed on the select card in the UI.|
 |iconClass|Icon of the alert type that will be displayed on the select card in the UI.|
 |validate|Validation function for the alert params.|
-|alertParamsExpression|React functional component for building UI of the current alert type params.|
+|alertParamsExpression| A lazy loaded React component for building UI of the current alert type params.|
 |defaultActionMessage|Optional property for providing default message for all added actions with `message` property.|
 
 IMPORTANT: The current UI supports a single action group only. 
@@ -295,16 +301,16 @@ Below is a list of steps that should be done to build and register a new alert t
 
 1. At any suitable place in Kibana, create a file, which will expose an object implementing interface [AlertTypeModel](https://github.com/elastic/kibana/blob/55b7905fb5265b73806006e7265739545d7521d0/x-pack/legacy/plugins/triggers_actions_ui/np_ready/public/types.ts#L83). Example:
 ```
+import { lazy } from 'react';
 import { AlertTypeModel } from '../../../../types';
-import { ExampleExpression } from './expression';
 import { validateExampleAlertType } from './validation';
 
 export function getAlertType(): AlertTypeModel {
   return {
     id: 'example',
     name: 'Example Alert Type',
     iconClass: 'bell',
-    alertParamsExpression: ExampleExpression,
+    alertParamsExpression: lazy(() => import('./expression')),
     validate: validateExampleAlertType,
     defaultActionMessage: 'Alert [{{ctx.metadata.name}}] has exceeded the threshold',
   };
@@ -361,6 +367,9 @@ export const ExampleExpression: React.FunctionComponent<ExampleProps> = ({
   );
 };
 
+// Export as default in order to support lazy loading
+export {ExampleExpression as default};
+
 ```
 This alert type form becomes available, when the card of `Example Alert Type` is selected.
 Each expression word here is `EuiExpression` component and implements the basic aggregation, grouping and comparison methods.
@@ -1017,7 +1026,7 @@ Below is a list of steps that should be done to build and register a new action
 
 1. At any suitable place in Kibana, create a file, which will expose an object implementing interface [ActionTypeModel]:
 ```
-import React, { Fragment } from 'react';
+import React, { Fragment, lazy } from 'react';
 import { i18n } from '@kbn/i18n';
 import {
   ActionTypeModel,

x-pack/plugins/triggers_actions_ui/public/application/app.tsx

@@ -3,8 +3,8 @@
  * or more contributor license agreements. Licensed under the Elastic License;
  * you may not use this file except in compliance with the Elastic License.
  */
-import React, { lazy, Suspense } from 'react';
-import { Switch, Route, Redirect, HashRouter, RouteComponentProps } from 'react-router-dom';
+import React, { lazy } from 'react';
+import { Switch, Route, Redirect, HashRouter } from 'react-router-dom';
 import {
   ChromeStart,
   DocLinksStart,
@@ -15,7 +15,6 @@ import {
   ChromeBreadcrumb,
   CoreStart,
 } from 'kibana/public';
-import { EuiLoadingSpinner, EuiFlexGroup, EuiFlexItem } from '@elastic/eui';
 import { BASE_PATH, Section, routeToAlertDetails } from './constants';
 import { AppContextProvider, useAppDependencies } from './app_context';
 import { hasShowAlertsCapability } from './lib/capabilities';
@@ -24,6 +23,7 @@ import { TypeRegistry } from './type_registry';
 import { ChartsPluginStart } from '../../../../../src/plugins/charts/public';
 import { DataPublicPluginStart } from '../../../../../src/plugins/data/public';
 import { PluginStartContract as AlertingStart } from '../../../alerting/public';
+import { suspendedComponentWithProps } from './lib/suspended_component_with_props';
 
 const TriggersActionsUIHome = lazy(async () => import('./home'));
 const AlertDetailsRoute = lazy(() =>
@@ -68,30 +68,15 @@ export const AppWithoutRouter = ({ sectionsRegex }: { sectionsRegex: string }) =
     <Switch>
       <Route
         path={`${BASE_PATH}/:section(${sectionsRegex})`}
-        component={suspendedRouteComponent(TriggersActionsUIHome)}
+        component={suspendedComponentWithProps(TriggersActionsUIHome, 'xl')}
       />
       {canShowAlerts && (
-        <Route path={routeToAlertDetails} component={suspendedRouteComponent(AlertDetailsRoute)} />
+        <Route
+          path={routeToAlertDetails}
+          component={suspendedComponentWithProps(AlertDetailsRoute, 'xl')}
+        />
       )}
       <Redirect from={`${BASE_PATH}`} to={`${BASE_PATH}/${DEFAULT_SECTION}`} />
     </Switch>
   );
 };
-
-function suspendedRouteComponent<T = unknown>(
-  RouteComponent: React.ComponentType<RouteComponentProps<T>>
-) {
-  return (props: RouteComponentProps<T>) => (
-    <Suspense
-      fallback={
-        <EuiFlexGroup justifyContent="center">
-          <EuiFlexItem grow={false}>
-            <EuiLoadingSpinner size="xl" />
-          </EuiFlexItem>
-        </EuiFlexGroup>
-      }
-    >
-      <RouteComponent {...props} />
-    </Suspense>
-  );
-}

x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/expression.tsx

@@ -42,6 +42,7 @@ import {
 } from '../../../../common';
 import { builtInAggregationTypes } from '../../../../common/constants';
 import { IndexThresholdAlertParams } from './types';
+import { AlertTypeParamsExpressionProps } from '../../../../types';
 import { AlertsContextValue } from '../../../context/alerts_context';
 import './expression.scss';
 
@@ -66,23 +67,10 @@ const expressionFieldsWithValidation = [
   'timeWindowSize',
 ];
 
-interface IndexThresholdProps {
-  alertParams: IndexThresholdAlertParams;
-  alertInterval: string;
-  setAlertParams: (property: string, value: any) => void;
-  setAlertProperty: (key: string, value: any) => void;
-  errors: { [key: string]: string[] };
-  alertsContext: AlertsContextValue;
-}
-
-export const IndexThresholdAlertTypeExpression: React.FunctionComponent<IndexThresholdProps> = ({
-  alertParams,
-  alertInterval,
-  setAlertParams,
-  setAlertProperty,
-  errors,
-  alertsContext,
-}) => {
+export const IndexThresholdAlertTypeExpression: React.FunctionComponent<AlertTypeParamsExpressionProps<
+  IndexThresholdAlertParams,
+  AlertsContextValue
+>> = ({ alertParams, alertInterval, setAlertParams, setAlertProperty, errors, alertsContext }) => {
   const {
     index,
     timeField,
@@ -476,3 +464,6 @@ export const IndexThresholdAlertTypeExpression: React.FunctionComponent<IndexThr
     </Fragment>
   );
 };
+
+// eslint-disable-next-line import/no-default-export
+export { IndexThresholdAlertTypeExpression as default };

x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/index.ts

@@ -3,16 +3,19 @@
  * or more contributor license agreements. Licensed under the Elastic License;
  * you may not use this file except in compliance with the Elastic License.
  */
+import { lazy } from 'react';
+
 import { AlertTypeModel } from '../../../../types';
-import { IndexThresholdAlertTypeExpression } from './expression';
 import { validateExpression } from './validation';
+import { IndexThresholdAlertParams } from './types';
+import { AlertsContextValue } from '../../../context/alerts_context';
 
-export function getAlertType(): AlertTypeModel {
+export function getAlertType(): AlertTypeModel<IndexThresholdAlertParams, AlertsContextValue> {
   return {
     id: '.index-threshold',
     name: 'Index threshold',
     iconClass: 'alert',
-    alertParamsExpression: IndexThresholdAlertTypeExpression,
+    alertParamsExpression: lazy(() => import('./expression')),
     validate: validateExpression,
   };
 }

x-pack/plugins/triggers_actions_ui/public/application/lib/suspended_component_with_props.tsx

@@ -0,0 +1,27 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+import React, { Suspense } from 'react';
+import { EuiLoadingSpinner, EuiFlexGroup, EuiFlexItem } from '@elastic/eui';
+import { EuiLoadingSpinnerSize } from '@elastic/eui/src/components/loading/loading_spinner';
+
+export function suspendedComponentWithProps<T = unknown>(
+  ComponentToSuspend: React.ComponentType<T>,
+  size?: EuiLoadingSpinnerSize
+) {
+  return (props: T) => (
+    <Suspense
+      fallback={
+        <EuiFlexGroup justifyContent="center">
+          <EuiFlexItem grow={false}>
+            <EuiLoadingSpinner size={size ?? 'm'} />
+          </EuiFlexItem>
+        </EuiFlexGroup>
+      }
+    >
+      <ComponentToSuspend {...props} />
+    </Suspense>
+  );
+}

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/action_form.test.tsx

@@ -10,7 +10,7 @@ import { ReactWrapper } from 'enzyme';
 import { act } from 'react-dom/test-utils';
 import { actionTypeRegistryMock } from '../../action_type_registry.mock';
 import { ValidationResult, Alert, AlertAction } from '../../../types';
-import { ActionForm } from './action_form';
+import ActionForm from './action_form';
 jest.mock('../../lib/action_connector_api', () => ({
   loadAllActions: jest.fn(),
   loadActionTypes: jest.fn(),

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/action_form.tsx

@@ -707,3 +707,6 @@ export const ActionForm = ({
     </Fragment>
   );
 };
+
+// eslint-disable-next-line import/no-default-export
+export { ActionForm as default };

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/connector_add_flyout.test.tsx

@@ -6,7 +6,7 @@
 import * as React from 'react';
 import { mountWithIntl } from 'test_utils/enzyme_helpers';
 import { coreMock } from '../../../../../../../src/core/public/mocks';
-import { ConnectorAddFlyout } from './connector_add_flyout';
+import ConnectorAddFlyout from './connector_add_flyout';
 import { ActionsConnectorsContextProvider } from '../../context/actions_connectors_context';
 import { actionTypeRegistryMock } from '../../action_type_registry.mock';
 import { ValidationResult } from '../../../types';

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/connector_add_flyout.tsx

@@ -319,3 +319,6 @@ const UpgradeYourLicenseCallOut = ({ http }: { http: HttpSetup }) => (
     </EuiFlexGroup>
   </EuiCallOut>
 );
+
+// eslint-disable-next-line import/no-default-export
+export { ConnectorAddFlyout as default };

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/connector_edit_flyout.test.tsx

@@ -9,7 +9,7 @@ import { coreMock } from '../../../../../../../src/core/public/mocks';
 import { ActionsConnectorsContextProvider } from '../../context/actions_connectors_context';
 import { actionTypeRegistryMock } from '../../action_type_registry.mock';
 import { ValidationResult } from '../../../types';
-import { ConnectorEditFlyout } from './connector_edit_flyout';
+import ConnectorEditFlyout from './connector_edit_flyout';
 import { AppContextProvider } from '../../app_context';
 
 const actionTypeRegistry = actionTypeRegistryMock.create();

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/connector_edit_flyout.tsx

@@ -254,3 +254,6 @@ export const ConnectorEditFlyout = ({
     </EuiFlyout>
   );
 };
+
+// eslint-disable-next-line import/no-default-export
+export { ConnectorEditFlyout as default };

x-pack/plugins/triggers_actions_ui/public/application/sections/action_connector_form/index.ts

@@ -4,6 +4,13 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-export { ConnectorAddFlyout } from './connector_add_flyout';
-export { ConnectorEditFlyout } from './connector_edit_flyout';
-export { ActionForm } from './action_form';
+import { lazy } from 'react';
+import { suspendedComponentWithProps } from '../../lib/suspended_component_with_props';
+
+export const ConnectorAddFlyout = suspendedComponentWithProps(
+  lazy(() => import('./connector_add_flyout'))
+);
+export const ConnectorEditFlyout = suspendedComponentWithProps(
+  lazy(() => import('./connector_edit_flyout'))
+);
+export const ActionForm = suspendedComponentWithProps(lazy(() => import('./action_form')));

x-pack/plugins/triggers_actions_ui/public/application/sections/actions_connectors_list/components/actions_connectors_list.test.tsx

@@ -202,11 +202,12 @@ describe('actions_connectors_list component with items', () => {
     expect(wrapper.find('[data-test-subj="preConfiguredTitleMessage"]')).toHaveLength(2);
   });
 
-  test('if select item for edit should render ConnectorEditFlyout', () => {
-    wrapper
+  test('if select item for edit should render ConnectorEditFlyout', async () => {
+    await wrapper
       .find('[data-test-subj="edit1"]')
       .first()
       .simulate('click');
+
     expect(wrapper.find('ConnectorEditFlyout')).toHaveLength(1);
   });
 });

x-pack/plugins/triggers_actions_ui/public/application/sections/actions_connectors_list/components/actions_connectors_list.tsx

@@ -22,7 +22,9 @@ import { i18n } from '@kbn/i18n';
 import { FormattedMessage } from '@kbn/i18n/react';
 import { useAppDependencies } from '../../../app_context';
 import { loadAllActions, loadActionTypes, deleteActions } from '../../../lib/action_connector_api';
-import { ConnectorAddFlyout, ConnectorEditFlyout } from '../../action_connector_form';
+import ConnectorAddFlyout from '../../action_connector_form/connector_add_flyout';
+import ConnectorEditFlyout from '../../action_connector_form/connector_edit_flyout';
+
 import { hasDeleteActionsCapability, hasSaveActionsCapability } from '../../../lib/capabilities';
 import { DeleteModalConfirmation } from '../../../components/delete_modal_confirmation';
 import { ActionsConnectorsContextProvider } from '../../../context/actions_connectors_context';

x-pack/plugins/triggers_actions_ui/public/application/sections/alert_form/alert_add.test.tsx

@@ -9,7 +9,7 @@ import { act } from 'react-dom/test-utils';
 import { FormattedMessage } from '@kbn/i18n/react';
 import { EuiFormLabel } from '@elastic/eui';
 import { coreMock } from '../../../../../../../src/core/public/mocks';
-import { AlertAdd } from './alert_add';
+import AlertAdd from './alert_add';
 import { actionTypeRegistryMock } from '../../action_type_registry.mock';
 import { ValidationResult } from '../../../types';
 import { AlertsContextProvider, useAlertsContext } from '../../context/alerts_context';

x-pack/plugins/triggers_actions_ui/public/application/sections/alert_form/alert_add.tsx

@@ -219,3 +219,6 @@ const parseErrors: (errors: IErrorObject) => boolean = errors =>
     if (isObject(errorList)) return parseErrors(errorList as IErrorObject);
     return errorList.length >= 1;
   });
+
+// eslint-disable-next-line import/no-default-export
+export { AlertAdd as default };

x-pack/plugins/triggers_actions_ui/public/application/sections/alert_form/alert_edit.test.tsx

@@ -12,7 +12,7 @@ import { ValidationResult } from '../../../types';
 import { AlertsContextProvider } from '../../context/alerts_context';
 import { alertTypeRegistryMock } from '../../alert_type_registry.mock';
 import { ReactWrapper } from 'enzyme';
-import { AlertEdit } from './alert_edit';
+import AlertEdit from './alert_edit';
 import { AppContextProvider } from '../../app_context';
 const actionTypeRegistry = actionTypeRegistryMock.create();
 const alertTypeRegistry = alertTypeRegistryMock.create();

x-pack/plugins/triggers_actions_ui/public/application/sections/alert_form/alert_edit.tsx

@@ -201,3 +201,6 @@ export const AlertEdit = ({ initialAlert, onClose }: AlertEditProps) => {
     </EuiPortal>
   );
 };
+
+// eslint-disable-next-line import/no-default-export
+export { AlertEdit as default };