[Lens] Reduce initial bundle size (#78142)

x-pack/plugins/lens/public/app_plugin/_index.scss

@@ -1 +0,0 @@
-@import 'app';

x-pack/plugins/lens/public/app_plugin/app.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './app.scss';
+
 import _ from 'lodash';
 import React, { useState, useEffect, useCallback } from 'react';
 import { i18n } from '@kbn/i18n';

x-pack/plugins/lens/public/async_services.ts

@@ -0,0 +1,24 @@
+/*
+ * 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.
+ */
+
+/**
+ * This file re-exports all parts of visualizations and datasources which can be loaded lazily
+ * (to reduce page load bundle size) when Lens is actually accessed via editor or embeddable.
+ *
+ * It's also possible for each visualization and datasource to resolve this locally, but this causes
+ * a burst of bundles being loaded on Lens startup at once (and in some scenarios cascading bundle loads).
+ * This file causes all of them to be served in a single request.
+ */
+
+export * from './datatable_visualization/datatable_visualization';
+export * from './metric_visualization/metric_visualization';
+export * from './pie_visualization/pie_visualization';
+export * from './xy_visualization/xy_visualization';
+
+export * from './indexpattern_datasource/indexpattern';
+
+export * from './editor_frame_service/editor_frame';
+export * from './app_plugin/mounter';

x-pack/plugins/lens/public/datatable_visualization/_index.scss

@@ -1 +0,0 @@
-@import 'visualization';

x-pack/plugins/lens/public/datatable_visualization/datatable_visualization.ts

@@ -0,0 +1,8 @@
+/*
+ * 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.
+ */
+
+export * from './expression';
+export * from './visualization';

x-pack/plugins/lens/public/datatable_visualization/expression.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './expression.scss';
+
 import React, { useMemo } from 'react';
 import ReactDOM from 'react-dom';
 import { i18n } from '@kbn/i18n';

x-pack/plugins/lens/public/datatable_visualization/index.ts

@@ -5,9 +5,7 @@
  */
 
 import { CoreSetup } from 'kibana/public';
-import { datatableVisualization } from './visualization';
 import { ExpressionsSetup } from '../../../../../src/plugins/expressions/public';
-import { datatable, datatableColumns, getDatatableRenderer } from './expression';
 import { EditorFrameSetup, FormatFactory } from '../types';
 import { UiActionsStart } from '../../../../../src/plugins/ui_actions/public';
 import { DataPublicPluginStart } from '../../../../../src/plugins/data/public';
@@ -29,6 +27,13 @@ export class DatatableVisualization {
     core: CoreSetup<DatatableVisualizationPluginStartPlugins, void>,
     { expressions, formatFactory, editorFrame }: DatatableVisualizationPluginSetupPlugins
   ) {
+    editorFrame.registerVisualization(async () => {
+      const {
+        datatable,
+        datatableColumns,
+        getDatatableRenderer,
+        datatableVisualization,
+      } = await import('../async_services');
       expressions.registerFunction(() => datatableColumns);
       expressions.registerFunction(() => datatable);
       expressions.registerRenderer(() =>
@@ -39,6 +44,7 @@ export class DatatableVisualization {
             .then(([_, { data: dataStart }]) => dataStart.search.aggs.types.get),
         })
       );
-    editorFrame.registerVisualization(datatableVisualization);
+      return datatableVisualization;
+    });
   }
 }

x-pack/plugins/lens/public/drag_drop/_index.scss

@@ -1 +0,0 @@
-@import 'drag_drop';

x-pack/plugins/lens/public/drag_drop/drag_drop.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './drag_drop.scss';
+
 import React, { useState, useContext } from 'react';
 import classNames from 'classnames';
 import { DragContext } from './providers';

x-pack/plugins/lens/public/editor_frame_service/_index.scss

@@ -1 +0,0 @@
-@import 'editor_frame/index';

x-pack/plugins/lens/public/editor_frame_service/editor_frame/_expression_renderer.scss

@@ -1,12 +0,0 @@
-.lnsExpressionRenderer {
-  @include euiScrollBar;
-  position: relative;
-  width: 100%;
-  height: 100%;
-  display: flex;
-  overflow: auto;
-
-  .lnsExpressionRenderer__component {
-    position: static; // Let the progress indicator position itself against the outer parent
-  }
-}

x-pack/plugins/lens/public/editor_frame_service/editor_frame/data_panel_wrapper.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './data_panel_wrapper.scss';
+
 import React, { useMemo, memo, useContext, useState } from 'react';
 import { i18n } from '@kbn/i18n';
 import { EuiPopover, EuiButtonIcon, EuiContextMenuPanel, EuiContextMenuItem } from '@elastic/eui';

x-pack/plugins/lens/public/editor_frame_service/editor_frame/frame_layout.scss

@@ -1,3 +1,5 @@
+@import '../../variables';
+
 .lnsFrameLayout {
   padding: 0;
   position: absolute;

x-pack/plugins/lens/public/editor_frame_service/editor_frame/frame_layout.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './frame_layout.scss';
+
 import React from 'react';
 import { EuiPage, EuiPageSideBar, EuiPageBody } from '@elastic/eui';
 

x-pack/plugins/lens/public/editor_frame_service/editor_frame/index.scss

@@ -1,5 +0,0 @@
-@import 'data_panel_wrapper';
-@import 'expression_renderer';
-@import 'frame_layout';
-@import 'suggestion_panel';
-@import 'workspace_panel_wrapper';

x-pack/plugins/lens/public/editor_frame_service/editor_frame/suggestion_panel.scss

@@ -1,3 +1,6 @@
+@import '../../mixins';
+@import '../../variables';
+
 .lnsSuggestionPanel__title {
   margin-left: $euiSizeXS / 2;
 }

x-pack/plugins/lens/public/editor_frame_service/editor_frame/suggestion_panel.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './suggestion_panel.scss';
+
 import _, { camelCase } from 'lodash';
 import React, { useState, useEffect, useMemo } from 'react';
 import { FormattedMessage } from '@kbn/i18n/react';

x-pack/plugins/lens/public/editor_frame_service/editor_frame/workspace_panel/workspace_panel_wrapper.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './workspace_panel_wrapper.scss';
+
 import React, { useCallback } from 'react';
 import { i18n } from '@kbn/i18n';
 import classNames from 'classnames';

x-pack/plugins/lens/public/editor_frame_service/service.tsx

@@ -22,7 +22,6 @@ import {
   EditorFrameStart,
 } from '../types';
 import { Document } from '../persistence/saved_object_store';
-import { EditorFrame } from './editor_frame';
 import { mergeTables } from './merge_tables';
 import { formatColumn } from './format_column';
 import { EmbeddableFactory, LensEmbeddableStartServices } from './embeddable/embeddable_factory';
@@ -47,9 +46,11 @@ export interface EditorFrameStartPlugins {
 }
 
 async function collectAsyncDefinitions<T extends { id: string }>(
-  definitions: Array<T | Promise<T>>
+  definitions: Array<T | (() => Promise<T>)>
 ) {
-  const resolvedDefinitions = await Promise.all(definitions);
+  const resolvedDefinitions = await Promise.all(
+    definitions.map((definition) => (typeof definition === 'function' ? definition() : definition))
+  );
   const definitionMap: Record<string, T> = {};
   resolvedDefinitions.forEach((definition) => {
     definitionMap[definition.id] = definition;
@@ -61,8 +62,8 @@ async function collectAsyncDefinitions<T extends { id: string }>(
 export class EditorFrameService {
   constructor() {}
 
-  private readonly datasources: Array<Datasource | Promise<Datasource>> = [];
-  private readonly visualizations: Array<Visualization | Promise<Visualization>> = [];
+  private readonly datasources: Array<Datasource | (() => Promise<Datasource>)> = [];
+  private readonly visualizations: Array<Visualization | (() => Promise<Visualization>)> = [];
 
   /**
    * This method takes a Lens saved object as returned from the persistence helper,
@@ -124,7 +125,7 @@ export class EditorFrameService {
       ]);
 
       return {
-        mount: (
+        mount: async (
           element,
           { doc, onError, dateRange, query, filters, savedQuery, onChange, showNoDataPopover }
         ) => {
@@ -132,6 +133,8 @@ export class EditorFrameService {
           const firstDatasourceId = Object.keys(resolvedDatasources)[0];
           const firstVisualizationId = Object.keys(resolvedVisualizations)[0];
 
+          const { EditorFrame } = await import('../async_services');
+
           render(
             <I18nProvider>
               <EditorFrame

x-pack/plugins/lens/public/index.scss

@@ -1,14 +0,0 @@
-// Import the EUI global scope so we can use EUI constants
-@import '@elastic/eui/src/global_styling/variables/index';
-@import '@elastic/eui/src/global_styling/mixins/index';
-
-@import 'variables';
-@import 'mixins';
-
-@import 'app_plugin/index';
-@import 'datatable_visualization/index';
-@import 'drag_drop/index';
-@import 'editor_frame_service/index';
-@import 'indexpattern_datasource/index';
-@import 'xy_visualization/index';
-@import 'metric_visualization/index';

x-pack/plugins/lens/public/indexpattern_datasource/_index.scss

@@ -1 +0,0 @@
-@import 'field_item';

x-pack/plugins/lens/public/indexpattern_datasource/field_item.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './field_item.scss';
+
 import React, { useState } from 'react';
 import DateMath from '@elastic/datemath';
 import {

x-pack/plugins/lens/public/indexpattern_datasource/index.ts

@@ -6,8 +6,6 @@
 
 import { CoreSetup } from 'kibana/public';
 import { Storage } from '../../../../../src/plugins/kibana_utils/public';
-import { getIndexPatternDatasource } from './indexpattern';
-import { renameColumns } from './rename_columns';
 import { ExpressionsSetup } from '../../../../../src/plugins/expressions/public';
 import { ChartsPluginSetup } from '../../../../../src/plugins/charts/public';
 import {
@@ -34,17 +32,17 @@ export class IndexPatternDatasource {
     core: CoreSetup<IndexPatternDatasourceStartPlugins>,
     { expressions, editorFrame, charts }: IndexPatternDatasourceSetupPlugins
   ) {
+    editorFrame.registerDatasource(async () => {
+      const { getIndexPatternDatasource, renameColumns } = await import('../async_services');
       expressions.registerFunction(renameColumns);
-
-    editorFrame.registerDatasource(
-      core.getStartServices().then(([coreStart, { data }]) =>
+      return core.getStartServices().then(([coreStart, { data }]) =>
         getIndexPatternDatasource({
           core: coreStart,
           storage: new Storage(localStorage),
           data,
           charts,
         })
-      ) as Promise<Datasource>
-    );
+      ) as Promise<Datasource>;
+    });
   }
 }

x-pack/plugins/lens/public/indexpattern_datasource/indexpattern.tsx

@@ -104,6 +104,8 @@ export function uniqueLabels(layers: Record<string, IndexPatternLayer>) {
   return columnLabelMap;
 }
 
+export * from './rename_columns';
+
 export function getIndexPatternDatasource({
   core,
   storage,

x-pack/plugins/lens/public/metric_visualization/expression.test.tsx

@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { metricChart, MetricChart } from './metric_expression';
+import { metricChart, MetricChart } from './expression';
 import { LensMultiTable } from '../types';
 import React from 'react';
 import { shallow } from 'enzyme';

x-pack/plugins/lens/public/metric_visualization/expression.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './expression.scss';
+
 import React from 'react';
 import ReactDOM from 'react-dom';
 import {

x-pack/plugins/lens/public/metric_visualization/index.ts

@@ -5,9 +5,7 @@
  */
 
 import { CoreSetup } from 'kibana/public';
-import { metricVisualization } from './metric_visualization';
 import { ExpressionsSetup } from '../../../../../src/plugins/expressions/public';
-import { metricChart, getMetricChartRenderer } from './metric_expression';
 import { EditorFrameSetup, FormatFactory } from '../types';
 
 export interface MetricVisualizationPluginSetupPlugins {
@@ -23,10 +21,15 @@ export class MetricVisualization {
     _core: CoreSetup | null,
     { expressions, formatFactory, editorFrame }: MetricVisualizationPluginSetupPlugins
   ) {
+    editorFrame.registerVisualization(async () => {
+      const { metricVisualization, metricChart, getMetricChartRenderer } = await import(
+        '../async_services'
+      );
+
       expressions.registerFunction(() => metricChart);
 
       expressions.registerRenderer(() => getMetricChartRenderer(formatFactory));
-
-    editorFrame.registerVisualization(metricVisualization);
+      return metricVisualization;
+    });
   }
 }

x-pack/plugins/lens/public/metric_visualization/metric_visualization.ts

@@ -0,0 +1,8 @@
+/*
+ * 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.
+ */
+
+export * from './expression';
+export * from './visualization';

x-pack/plugins/lens/public/metric_visualization/visualization.test.ts

@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { metricVisualization } from './metric_visualization';
+import { metricVisualization } from './visualization';
 import { State } from './types';
 import { createMockDatasource, createMockFramePublicAPI } from '../editor_frame_service/mocks';
 import { generateId } from '../id_generator';

x-pack/plugins/lens/public/pie_visualization/index.ts

@@ -6,8 +6,6 @@
 
 import { CoreSetup } from 'src/core/public';
 import { ExpressionsSetup } from 'src/plugins/expressions/public';
-import { pieVisualization } from './pie_visualization';
-import { pie, getPieRenderer } from './register_expression';
 import { EditorFrameSetup, FormatFactory } from '../types';
 import { UiActionsStart } from '../../../../../src/plugins/ui_actions/public';
 import { ChartsPluginSetup } from '../../../../../src/plugins/charts/public';
@@ -30,6 +28,9 @@ export class PieVisualization {
     core: CoreSetup,
     { expressions, formatFactory, editorFrame, charts }: PieVisualizationPluginSetupPlugins
   ) {
+    editorFrame.registerVisualization(async () => {
+      const { pieVisualization, pie, getPieRenderer } = await import('../async_services');
+
       expressions.registerFunction(() => pie);
 
       expressions.registerRenderer(
@@ -38,7 +39,7 @@ export class PieVisualization {
           chartsThemeService: charts.theme,
         })
       );
-
-    editorFrame.registerVisualization(pieVisualization);
+      return pieVisualization;
+    });
   }
 }

x-pack/plugins/lens/public/pie_visualization/pie_visualization.ts

@@ -0,0 +1,8 @@
+/*
+ * 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.
+ */
+
+export * from './expression';
+export * from './visualization';

x-pack/plugins/lens/public/plugin.ts

@@ -35,7 +35,6 @@ import { EditorFrameStart } from './types';
 import { getLensAliasConfig } from './vis_type_alias';
 import { getSearchProvider } from './search_provider';
 
-import './index.scss';
 import { getLensAttributeService, LensAttributeService } from './lens_attribute_service';
 
 export interface LensPluginSetupDependencies {
@@ -127,7 +126,7 @@ export class LensPlugin {
       title: NOT_INTERNATIONALIZED_PRODUCT_NAME,
       navLinkStatus: AppNavLinkStatus.hidden,
       mount: async (params: AppMountParameters) => {
-        const { mountApp } = await import('./app_plugin/mounter');
+        const { mountApp } = await import('./async_services');
         return mountApp(core, params, {
           createEditorFrame: this.createEditorFrame!,
           attributeService: this.attributeService!,

x-pack/plugins/lens/public/types.ts

@@ -57,8 +57,12 @@ export interface EditorFrameInstance {
 
 export interface EditorFrameSetup {
   // generic type on the API functions to pull the "unknown vs. specific type" error into the implementation
-  registerDatasource: <T, P>(datasource: Datasource<T, P> | Promise<Datasource<T, P>>) => void;
-  registerVisualization: <T>(visualization: Visualization<T> | Promise<Visualization<T>>) => void;
+  registerDatasource: <T, P>(
+    datasource: Datasource<T, P> | (() => Promise<Datasource<T, P>>)
+  ) => void;
+  registerVisualization: <T>(
+    visualization: Visualization<T> | (() => Promise<Visualization<T>>)
+  ) => void;
 }
 
 export interface EditorFrameStart {

x-pack/plugins/lens/public/visualization_container.scss

@@ -2,3 +2,16 @@
   @include euiScrollBar;
   overflow: auto;
 }
+
+.lnsExpressionRenderer {
+  @include euiScrollBar;
+  position: relative;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  overflow: auto;
+
+  .lnsExpressionRenderer__component {
+    position: static; // Let the progress indicator position itself against the outer parent
+  }
+}

x-pack/plugins/lens/public/visualization_container.tsx

@@ -4,11 +4,11 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './visualization_container.scss';
+
 import React from 'react';
 import classNames from 'classnames';
 
-import './visualization_container.scss';
-
 interface Props extends React.HTMLAttributes<HTMLDivElement> {
   isReady?: boolean;
   reportTitle?: string;

x-pack/plugins/lens/public/xy_visualization/_index.scss

@@ -1 +0,0 @@
-@import 'xy_expression';

x-pack/plugins/lens/public/xy_visualization/expression.test.tsx

@@ -17,7 +17,7 @@ import {
   SeriesNameFn,
   Fit,
 } from '@elastic/charts';
-import { xyChart, XYChart } from './xy_expression';
+import { xyChart, XYChart } from './expression';
 import { LensMultiTable } from '../types';
 import { KibanaDatatable, KibanaDatatableRow } from '../../../../../src/plugins/expressions/public';
 import React from 'react';

x-pack/plugins/lens/public/xy_visualization/expression.tsx

@@ -4,6 +4,8 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+import './expression.scss';
+
 import React, { useState, useEffect } from 'react';
 import ReactDOM from 'react-dom';
 import moment from 'moment';

x-pack/plugins/lens/public/xy_visualization/index.ts

@@ -8,16 +8,6 @@ import { CoreSetup, IUiSettingsClient } from 'kibana/public';
 import moment from 'moment-timezone';
 import { ExpressionsSetup } from '../../../../../src/plugins/expressions/public';
 import { UI_SETTINGS } from '../../../../../src/plugins/data/public';
-import { xyVisualization } from './xy_visualization';
-import { xyChart, getXyChartRenderer } from './xy_expression';
-import {
-  legendConfig,
-  layerConfig,
-  yAxisConfig,
-  tickLabelsConfig,
-  gridlinesConfig,
-  axisTitlesVisibilityConfig,
-} from './types';
 import { EditorFrameSetup, FormatFactory } from '../types';
 import { ChartsPluginSetup } from '../../../../../src/plugins/charts/public';
 
@@ -44,6 +34,18 @@ export class XyVisualization {
     core: CoreSetup,
     { expressions, formatFactory, editorFrame, charts }: XyVisualizationPluginSetupPlugins
   ) {
+    editorFrame.registerVisualization(async () => {
+      const {
+        legendConfig,
+        yAxisConfig,
+        tickLabelsConfig,
+        gridlinesConfig,
+        axisTitlesVisibilityConfig,
+        layerConfig,
+        xyChart,
+        getXyChartRenderer,
+        xyVisualization,
+      } = await import('../async_services');
       expressions.registerFunction(() => legendConfig);
       expressions.registerFunction(() => yAxisConfig);
       expressions.registerFunction(() => tickLabelsConfig);
@@ -60,7 +62,7 @@ export class XyVisualization {
           histogramBarTarget: core.uiSettings.get<number>(UI_SETTINGS.HISTOGRAM_BAR_TARGET),
         })
       );
-
-    editorFrame.registerVisualization(xyVisualization);
+      return xyVisualization;
+    });
   }
 }

x-pack/plugins/lens/public/xy_visualization/visualization.test.ts

@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { xyVisualization } from './xy_visualization';
+import { xyVisualization } from './visualization';
 import { Position } from '@elastic/charts';
 import { Operation } from '../types';
 import { State, SeriesType } from './types';

x-pack/plugins/lens/public/xy_visualization/xy_visualization.ts

@@ -0,0 +1,9 @@
+/*
+ * 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.
+ */
+
+export * from './expression';
+export * from './types';
+export * from './visualization';