[examples] expressions explorer (#88344)

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.ast.md

@@ -0,0 +1,11 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ExpressionsInspectorAdapter](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.md) &gt; [ast](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.ast.md)
+
+## ExpressionsInspectorAdapter.ast property
+
+<b>Signature:</b>
+
+```typescript
+get ast(): any;
+```

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.logast.md

@@ -0,0 +1,22 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ExpressionsInspectorAdapter](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.md) &gt; [logAST](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.logast.md)
+
+## ExpressionsInspectorAdapter.logAST() method
+
+<b>Signature:</b>
+
+```typescript
+logAST(ast: any): void;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  ast | <code>any</code> |  |
+
+<b>Returns:</b>
+
+`void`
+

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.md

@@ -0,0 +1,24 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-plugins-expressions-public](./kibana-plugin-plugins-expressions-public.md) &gt; [ExpressionsInspectorAdapter](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.md)
+
+## ExpressionsInspectorAdapter class
+
+<b>Signature:</b>
+
+```typescript
+export declare class ExpressionsInspectorAdapter extends EventEmitter 
+```
+
+## Properties
+
+|  Property | Modifiers | Type | Description |
+|  --- | --- | --- | --- |
+|  [ast](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.ast.md) |  | <code>any</code> |  |
+
+## Methods
+
+|  Method | Modifiers | Description |
+|  --- | --- | --- |
+|  [logAST(ast)](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.logast.md) |  |  |
+

docs/development/plugins/expressions/public/kibana-plugin-plugins-expressions-public.md

@@ -16,6 +16,7 @@
 |  [ExpressionRenderer](./kibana-plugin-plugins-expressions-public.expressionrenderer.md) |  |
 |  [ExpressionRendererRegistry](./kibana-plugin-plugins-expressions-public.expressionrendererregistry.md) |  |
 |  [ExpressionRenderHandler](./kibana-plugin-plugins-expressions-public.expressionrenderhandler.md) |  |
+|  [ExpressionsInspectorAdapter](./kibana-plugin-plugins-expressions-public.expressionsinspectoradapter.md) |  |
 |  [ExpressionsPublicPlugin](./kibana-plugin-plugins-expressions-public.expressionspublicplugin.md) |  |
 |  [ExpressionsService](./kibana-plugin-plugins-expressions-public.expressionsservice.md) | <code>ExpressionsService</code> class is used for multiple purposes:<!-- -->1. It implements the same Expressions service that can be used on both: (1) server-side and (2) browser-side. 2. It implements the same Expressions service that users can fork/clone, thus have their own instance of the Expressions plugin. 3. <code>ExpressionsService</code> defines the public contracts of \*setup\* and \*start\* Kibana Platform life-cycles for ease-of-use on server-side and browser-side. 4. <code>ExpressionsService</code> creates a bound version of all exported contract functions. 5. Functions are bound the way there are:<!-- -->\`\`\`<!-- -->ts registerFunction = (...args: Parameters<!-- -->&lt;<!-- -->Executor\['registerFunction'\]<!-- -->&gt; ): ReturnType<!-- -->&lt;<!-- -->Executor\['registerFunction'\]<!-- -->&gt; =<!-- -->&gt; this.executor.registerFunction(...args); \`\`\`<!-- -->so that JSDoc appears in developers IDE when they use those <code>plugins.expressions.registerFunction(</code>. |
 |  [ExpressionType](./kibana-plugin-plugins-expressions-public.expressiontype.md) |  |

examples/expressions_explorer/README.md

@@ -0,0 +1,8 @@
+## expressions explorer
+
+This example expressions explorer app shows how to:
+ - to run expression
+ - to render expression output
+ - emit events from expression renderer and handle them
+
+To run this example, use the command `yarn start --run-examples`.

examples/expressions_explorer/kibana.json

@@ -0,0 +1,10 @@
+{
+  "id": "expressionsExplorer",
+  "version": "0.0.1",
+  "kibanaVersion": "kibana",
+  "server": false,
+  "ui": true,
+  "requiredPlugins": ["expressions", "inspector", "uiActions", "developerExamples"],
+  "optionalPlugins": [],
+  "requiredBundles": []
+}

examples/expressions_explorer/public/actions/navigate_action.ts

@@ -0,0 +1,21 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { createAction } from '../../../../src/plugins/ui_actions/public';
+
+export const ACTION_NAVIGATE = 'ACTION_NAVIGATE';
+
+export const createNavigateAction = () =>
+  createAction({
+    id: ACTION_NAVIGATE,
+    type: ACTION_NAVIGATE,
+    getDisplayName: () => 'Navigate',
+    execute: async (event: any) => {
+      window.location.href = event.href;
+    },
+  });

examples/expressions_explorer/public/actions/navigate_trigger.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { Trigger } from '../../../../src/plugins/ui_actions/public';
+
+export const NAVIGATE_TRIGGER_ID = 'NAVIGATE_TRIGGER_ID';
+
+export const navigateTrigger: Trigger = {
+  id: NAVIGATE_TRIGGER_ID,
+};

examples/expressions_explorer/public/actions_and_expressions.tsx

@@ -0,0 +1,102 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { useState } from 'react';
+import {
+  EuiFlexItem,
+  EuiFlexGroup,
+  EuiPageBody,
+  EuiPageContent,
+  EuiPageContentBody,
+  EuiPageHeader,
+  EuiPageHeaderSection,
+  EuiPanel,
+  EuiText,
+  EuiTitle,
+} from '@elastic/eui';
+import {
+  ExpressionsStart,
+  ReactExpressionRenderer,
+  ExpressionsInspectorAdapter,
+} from '../../../src/plugins/expressions/public';
+import { ExpressionEditor } from './editor/expression_editor';
+import { UiActionsStart } from '../../../src/plugins/ui_actions/public';
+import { NAVIGATE_TRIGGER_ID } from './actions/navigate_trigger';
+
+interface Props {
+  expressions: ExpressionsStart;
+  actions: UiActionsStart;
+}
+
+export function ActionsExpressionsExample({ expressions, actions }: Props) {
+  const [expression, updateExpression] = useState(
+    'button name="click me" href="http://www.google.com"'
+  );
+
+  const expressionChanged = (value: string) => {
+    updateExpression(value);
+  };
+
+  const inspectorAdapters = {
+    expression: new ExpressionsInspectorAdapter(),
+  };
+
+  const handleEvents = (event: any) => {
+    if (event.id !== 'NAVIGATE') return;
+    // enrich event context with some extra data
+    event.baseUrl = 'http://www.google.com';
+
+    actions.executeTriggerActions(NAVIGATE_TRIGGER_ID, event.value);
+  };
+
+  return (
+    <EuiPageBody>
+      <EuiPageHeader>
+        <EuiPageHeaderSection>
+          <EuiTitle size="l">
+            <h1>Actions from expression renderers</h1>
+          </EuiTitle>
+        </EuiPageHeaderSection>
+      </EuiPageHeader>
+      <EuiPageContent>
+        <EuiPageContentBody>
+          <EuiFlexGroup>
+            <EuiFlexItem>
+              <EuiText>
+                Here you can play with sample `button` which takes a url as configuration and
+                displays a button which emits custom BUTTON_CLICK trigger to which we have attached
+                a custom action which performs the navigation.
+              </EuiText>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+
+          <EuiFlexGroup gutterSize="l">
+            <EuiFlexItem>
+              <EuiPanel data-test-subj="expressionEditor" paddingSize="none" role="figure">
+                <ExpressionEditor value={expression} onChange={expressionChanged} />
+              </EuiPanel>
+            </EuiFlexItem>
+            <EuiFlexItem>
+              <EuiPanel paddingSize="none" role="figure">
+                <ReactExpressionRenderer
+                  expression={expression}
+                  debug={true}
+                  inspectorAdapters={inspectorAdapters}
+                  onEvent={handleEvents}
+                  renderError={(message: any) => {
+                    return <div>{message}</div>;
+                  }}
+                />
+              </EuiPanel>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+        </EuiPageContentBody>
+      </EuiPageContent>
+    </EuiPageBody>
+  );
+}

examples/expressions_explorer/public/app.tsx

@@ -0,0 +1,78 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React from 'react';
+import ReactDOM from 'react-dom';
+import {
+  EuiPage,
+  EuiPageHeader,
+  EuiPageBody,
+  EuiPageContent,
+  EuiPageContentBody,
+  EuiSpacer,
+  EuiText,
+  EuiLink,
+} from '@elastic/eui';
+import { AppMountParameters } from '../../../src/core/public';
+import { ExpressionsStart } from '../../../src/plugins/expressions/public';
+import { Start as InspectorStart } from '../../../src/plugins/inspector/public';
+import { RunExpressionsExample } from './run_expressions';
+import { RenderExpressionsExample } from './render_expressions';
+import { ActionsExpressionsExample } from './actions_and_expressions';
+import { UiActionsStart } from '../../../src/plugins/ui_actions/public';
+
+interface Props {
+  expressions: ExpressionsStart;
+  inspector: InspectorStart;
+  actions: UiActionsStart;
+}
+
+const ExpressionsExplorer = ({ expressions, inspector, actions }: Props) => {
+  return (
+    <EuiPage>
+      <EuiPageBody>
+        <EuiPageHeader>Expressions Explorer</EuiPageHeader>
+        <EuiPageContent>
+          <EuiPageContentBody>
+            <EuiText>
+              <p>
+                There are a couple of ways to run the expressions. Below some of the options are
+                demonstrated. You can read more about it{' '}
+                <EuiLink
+                  href={
+                    'https://github.com/elastic/kibana/blob/master/src/plugins/expressions/README.asciidoc'
+                  }
+                >
+                  here
+                </EuiLink>
+              </p>
+            </EuiText>
+
+            <EuiSpacer />
+
+            <RunExpressionsExample expressions={expressions} inspector={inspector} />
+
+            <EuiSpacer />
+
+            <RenderExpressionsExample expressions={expressions} inspector={inspector} />
+
+            <EuiSpacer />
+
+            <ActionsExpressionsExample expressions={expressions} actions={actions} />
+          </EuiPageContentBody>
+        </EuiPageContent>
+      </EuiPageBody>
+    </EuiPage>
+  );
+};
+
+export const renderApp = (props: Props, { element }: AppMountParameters) => {
+  ReactDOM.render(<ExpressionsExplorer {...props} />, element);
+
+  return () => ReactDOM.unmountComponentAtNode(element);
+};

examples/expressions_explorer/public/editor/expression_editor.tsx

@@ -0,0 +1,35 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React from 'react';
+import { EuiCodeEditor } from '@elastic/eui';
+
+interface Props {
+  value: string;
+  onChange: (value: string) => void;
+}
+
+export function ExpressionEditor({ value, onChange }: Props) {
+  return (
+    <EuiCodeEditor
+      mode="javascript"
+      theme="github"
+      width="100%"
+      value={value}
+      onChange={onChange}
+      setOptions={{
+        fontSize: '14px',
+        enableBasicAutocompletion: true,
+        enableSnippets: true,
+        enableLiveAutocompletion: true,
+      }}
+      onBlur={() => {}}
+      aria-label="Code Editor"
+    />
+  );
+}

examples/expressions_explorer/public/functions/button.ts

@@ -0,0 +1,50 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { i18n } from '@kbn/i18n';
+import { ExpressionFunctionDefinition } from '../../../../src/plugins/expressions/common';
+
+interface Arguments {
+  href: string;
+  name: string;
+}
+
+export type ExpressionFunctionButton = ExpressionFunctionDefinition<
+  'button',
+  unknown,
+  Arguments,
+  unknown
+>;
+
+export const buttonFn: ExpressionFunctionButton = {
+  name: 'button',
+  args: {
+    href: {
+      help: i18n.translate('expressions.functions.font.args.href', {
+        defaultMessage: 'Link to which to navigate',
+      }),
+      types: ['string'],
+      required: true,
+    },
+    name: {
+      help: i18n.translate('expressions.functions.font.args.name', {
+        defaultMessage: 'Name of the button',
+      }),
+      types: ['string'],
+      default: 'button',
+    },
+  },
+  help: 'Configures the button',
+  fn: (input: unknown, args: Arguments) => {
+    return {
+      type: 'render',
+      as: 'button',
+      value: args,
+    };
+  },
+};

examples/expressions_explorer/public/index.ts

@@ -0,0 +1,11 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { ExpressionsExplorerPlugin } from './plugin';
+
+export const plugin = () => new ExpressionsExplorerPlugin();

examples/expressions_explorer/public/inspector/ast_debug_view.tsx

@@ -0,0 +1,78 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { useState } from 'react';
+import { EuiTreeView, EuiDescriptionList, EuiCodeBlock, EuiText, EuiSpacer } from '@elastic/eui';
+
+interface Props {
+  ast: any;
+}
+
+const decorateAst = (ast: any, nodeClicked: any) => {
+  return ast.chain.map((link: any) => {
+    return {
+      id: link.function + Math.random(),
+      label: link.function,
+      callback: () => {
+        nodeClicked(link.debug);
+      },
+      children: Object.keys(link.arguments).reduce((result: any, key: string) => {
+        if (typeof link.arguments[key] === 'object') {
+          // result[key] = decorateAst(link.arguments[key]);
+        }
+        return result;
+      }, []),
+    };
+  });
+};
+
+const prepareNode = (key: string, value: any) => {
+  if (key === 'args') {
+    return (
+      <EuiCodeBlock language="json" fontSize="m" paddingSize="m" isCopyable>
+        {JSON.stringify(value, null, '\t')}
+      </EuiCodeBlock>
+    );
+  } else if (key === 'output' || key === 'input') {
+    return (
+      <EuiCodeBlock language="json" fontSize="m" paddingSize="m" isCopyable>
+        {JSON.stringify(value, null, '\t')}
+      </EuiCodeBlock>
+    );
+  } else if (key === 'success') {
+    return value ? 'true' : 'false';
+  } else return <span>{value}</span>;
+};
+
+export function AstDebugView({ ast }: Props) {
+  const [nodeInfo, setNodeInfo] = useState([] as any[]);
+  const items = decorateAst(ast, (node: any) => {
+    setNodeInfo(
+      Object.keys(node).map((key) => ({
+        title: key,
+        description: prepareNode(key, node[key]),
+      }))
+    );
+  });
+
+  return (
+    <div>
+      <EuiText>List of executed expression functions:</EuiText>
+      <EuiTreeView
+        items={items}
+        display="compressed"
+        expandByDefault
+        showExpansionArrows
+        aria-label="Document Outline"
+      />
+      <EuiSpacer />
+      <EuiText>Details of selected function:</EuiText>
+      <EuiDescriptionList type="column" listItems={nodeInfo} />
+    </div>
+  );
+}

examples/expressions_explorer/public/inspector/expressions_inspector_view.tsx

@@ -0,0 +1,98 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import { FormattedMessage } from '@kbn/i18n/react';
+import { EuiEmptyPrompt } from '@elastic/eui';
+import { InspectorViewProps, Adapters } from '../../../../src/plugins/inspector/public';
+import { AstDebugView } from './ast_debug_view';
+
+interface ExpressionsInspectorViewComponentState {
+  ast: any;
+  adapters: Adapters;
+}
+
+class ExpressionsInspectorViewComponent extends Component<
+  InspectorViewProps,
+  ExpressionsInspectorViewComponentState
+> {
+  static propTypes = {
+    adapters: PropTypes.object.isRequired,
+    title: PropTypes.string.isRequired,
+  };
+
+  state = {} as ExpressionsInspectorViewComponentState;
+
+  static getDerivedStateFromProps(
+    nextProps: Readonly<InspectorViewProps>,
+    state: ExpressionsInspectorViewComponentState
+  ) {
+    if (state && nextProps.adapters === state.adapters) {
+      return null;
+    }
+
+    const { ast } = nextProps.adapters.expression;
+
+    return {
+      adapters: nextProps.adapters,
+      ast,
+    };
+  }
+
+  onUpdateData = (ast: any) => {
+    this.setState({
+      ast,
+    });
+  };
+
+  componentDidMount() {
+    this.props.adapters.expression!.on('change', this.onUpdateData);
+  }
+
+  componentWillUnmount() {
+    this.props.adapters.expression!.removeListener('change', this.onUpdateData);
+  }
+
+  static renderNoData() {
+    return (
+      <EuiEmptyPrompt
+        title={
+          <h2>
+            <FormattedMessage
+              id="data.inspector.table.noDataAvailableTitle"
+              defaultMessage="No data available"
+            />
+          </h2>
+        }
+        body={
+          <React.Fragment>
+            <p>
+              <FormattedMessage
+                id="data.inspector.table.noDataAvailableDescription"
+                defaultMessage="The element did not provide any data."
+              />
+            </p>
+          </React.Fragment>
+        }
+      />
+    );
+  }
+
+  render() {
+    if (!this.state.ast) {
+      return ExpressionsInspectorViewComponent.renderNoData();
+    }
+
+    return <AstDebugView ast={this.state.ast} />;
+  }
+}
+
+// default export required for React.Lazy
+// eslint-disable-next-line import/no-default-export
+export default ExpressionsInspectorViewComponent;

examples/expressions_explorer/public/inspector/expressions_inspector_view_wrapper.tsx

@@ -0,0 +1,17 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { lazy } from 'react';
+
+const ExpressionsInspectorViewComponent = lazy(() => import('./expressions_inspector_view'));
+
+export const getExpressionsInspectorViewComponentWrapper = () => {
+  return (props: any) => {
+    return <ExpressionsInspectorViewComponent adapters={props.adapters} title={props.title} />;
+  };
+};

examples/expressions_explorer/public/inspector/index.ts

@@ -0,0 +1,25 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { i18n } from '@kbn/i18n';
+import { Adapters, InspectorViewDescription } from '../../../../src/plugins/inspector/public';
+import { getExpressionsInspectorViewComponentWrapper } from './expressions_inspector_view_wrapper';
+
+export const getExpressionsInspectorViewDescription = (): InspectorViewDescription => ({
+  title: i18n.translate('data.inspector.table.dataTitle', {
+    defaultMessage: 'Expression',
+  }),
+  order: 100,
+  help: i18n.translate('data.inspector.table..dataDescriptionTooltip', {
+    defaultMessage: 'View the expression behind the visualization',
+  }),
+  shouldShow(adapters: Adapters) {
+    return Boolean(adapters.expression);
+  },
+  component: getExpressionsInspectorViewComponentWrapper(),
+});

examples/expressions_explorer/public/plugin.tsx

@@ -0,0 +1,87 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { Plugin, CoreSetup, AppMountParameters, AppNavLinkStatus } from '../../../src/core/public';
+import { DeveloperExamplesSetup } from '../../developer_examples/public';
+import { ExpressionsSetup, ExpressionsStart } from '../../../src/plugins/expressions/public';
+import {
+  Setup as InspectorSetup,
+  Start as InspectorStart,
+} from '../../../src/plugins/inspector/public';
+import { getExpressionsInspectorViewDescription } from './inspector';
+import { UiActionsStart, UiActionsSetup } from '../../../src/plugins/ui_actions/public';
+import { NAVIGATE_TRIGGER_ID, navigateTrigger } from './actions/navigate_trigger';
+import { ACTION_NAVIGATE, createNavigateAction } from './actions/navigate_action';
+import { buttonRenderer } from './renderers/button';
+import { buttonFn } from './functions/button';
+
+interface StartDeps {
+  expressions: ExpressionsStart;
+  inspector: InspectorStart;
+  uiActions: UiActionsStart;
+}
+
+interface SetupDeps {
+  uiActions: UiActionsSetup;
+  expressions: ExpressionsSetup;
+  inspector: InspectorSetup;
+  developerExamples: DeveloperExamplesSetup;
+}
+
+export class ExpressionsExplorerPlugin implements Plugin<void, void, SetupDeps, StartDeps> {
+  public setup(core: CoreSetup<StartDeps>, deps: SetupDeps) {
+    // register custom inspector adapter & view
+    deps.inspector.registerView(getExpressionsInspectorViewDescription());
+
+    // register custom actions
+    deps.uiActions.registerTrigger(navigateTrigger);
+    deps.uiActions.registerAction(createNavigateAction());
+    deps.uiActions.attachAction(NAVIGATE_TRIGGER_ID, ACTION_NAVIGATE);
+
+    // register custom functions and renderers
+    deps.expressions.registerRenderer(buttonRenderer);
+    deps.expressions.registerFunction(buttonFn);
+
+    core.application.register({
+      id: 'expressionsExplorer',
+      title: 'Expressions Explorer',
+      navLinkStatus: AppNavLinkStatus.hidden,
+      async mount(params: AppMountParameters) {
+        const [, depsStart] = await core.getStartServices();
+        const { renderApp } = await import('./app');
+        return renderApp(
+          {
+            expressions: depsStart.expressions,
+            inspector: depsStart.inspector,
+            actions: depsStart.uiActions,
+          },
+          params
+        );
+      },
+    });
+
+    deps.developerExamples.register({
+      appId: 'expressionsExplorer',
+      title: 'Expressions',
+      description: `Expressions is a plugin that allows to execute Kibana expressions and render content using expression renderers. This example plugin showcases various usage scenarios.`,
+      links: [
+        {
+          label: 'README',
+          href: 'https://github.com/elastic/kibana/blob/master/src/plugins/expressions/README.md',
+          iconType: 'logoGithub',
+          size: 's',
+          target: '_blank',
+        },
+      ],
+    });
+  }
+
+  public start() {}
+
+  public stop() {}
+}

examples/expressions_explorer/public/render_expressions.tsx

@@ -0,0 +1,99 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { useState } from 'react';
+import {
+  EuiFlexItem,
+  EuiFlexGroup,
+  EuiPageBody,
+  EuiPageContent,
+  EuiPageContentBody,
+  EuiPageHeader,
+  EuiPageHeaderSection,
+  EuiPanel,
+  EuiText,
+  EuiTitle,
+  EuiButton,
+} from '@elastic/eui';
+import {
+  ExpressionsStart,
+  ReactExpressionRenderer,
+  ExpressionsInspectorAdapter,
+} from '../../../src/plugins/expressions/public';
+import { ExpressionEditor } from './editor/expression_editor';
+import { Start as InspectorStart } from '../../../src/plugins/inspector/public';
+
+interface Props {
+  expressions: ExpressionsStart;
+  inspector: InspectorStart;
+}
+
+export function RenderExpressionsExample({ expressions, inspector }: Props) {
+  const [expression, updateExpression] = useState('markdown "## expressions explorer rendering"');
+
+  const expressionChanged = (value: string) => {
+    updateExpression(value);
+  };
+
+  const inspectorAdapters = {
+    expression: new ExpressionsInspectorAdapter(),
+  };
+
+  return (
+    <EuiPageBody>
+      <EuiPageHeader>
+        <EuiPageHeaderSection>
+          <EuiTitle size="l">
+            <h1>Render expressions</h1>
+          </EuiTitle>
+        </EuiPageHeaderSection>
+      </EuiPageHeader>
+      <EuiPageContent>
+        <EuiPageContentBody>
+          <EuiFlexGroup>
+            <EuiFlexItem>
+              <EuiText>
+                In the below editor you can enter your expression and render it. Using
+                ReactExpressionRenderer component makes that very easy.
+              </EuiText>
+            </EuiFlexItem>
+            <EuiFlexItem>
+              <EuiButton
+                onClick={() => {
+                  inspector.open(inspectorAdapters);
+                }}
+              >
+                Open Inspector
+              </EuiButton>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+
+          <EuiFlexGroup gutterSize="l">
+            <EuiFlexItem>
+              <EuiPanel data-test-subj="expressionEditor" paddingSize="none" role="figure">
+                <ExpressionEditor value={expression} onChange={expressionChanged} />
+              </EuiPanel>
+            </EuiFlexItem>
+            <EuiFlexItem>
+              <EuiPanel data-test-subj="expressionRender" paddingSize="none" role="figure">
+                <ReactExpressionRenderer
+                  expression={expression}
+                  debug={true}
+                  inspectorAdapters={inspectorAdapters}
+                  renderError={(message: any) => {
+                    return <div>{message}</div>;
+                  }}
+                />
+              </EuiPanel>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+        </EuiPageContentBody>
+      </EuiPageContent>
+    </EuiPageBody>
+  );
+}

examples/expressions_explorer/public/renderers/button.tsx

@@ -0,0 +1,40 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import ReactDOM from 'react-dom';
+import React from 'react';
+import { EuiButton } from '@elastic/eui';
+import { ExpressionRenderDefinition } from '../../../../src/plugins/expressions/common/expression_renderers';
+
+export const buttonRenderer: ExpressionRenderDefinition<any> = {
+  name: 'button',
+  displayName: 'Button',
+  reuseDomNode: true,
+  render(domNode, config, handlers) {
+    const buttonClick = () => {
+      handlers.event({
+        id: 'NAVIGATE',
+        value: {
+          href: config.href,
+        },
+      });
+    };
+
+    const renderDebug = () => (
+      <div style={{ width: domNode.offsetWidth, height: domNode.offsetHeight }}>
+        <EuiButton data-test-subj="testExpressionButton" onClick={buttonClick}>
+          {config.name}
+        </EuiButton>
+      </div>
+    );
+
+    ReactDOM.render(renderDebug(), domNode, () => handlers.done());
+
+    handlers.onDestroy(() => ReactDOM.unmountComponentAtNode(domNode));
+  },
+};

examples/expressions_explorer/public/run_expressions.tsx

@@ -0,0 +1,118 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import React, { useState, useEffect, useMemo } from 'react';
+import {
+  EuiCodeBlock,
+  EuiFlexItem,
+  EuiFlexGroup,
+  EuiPageBody,
+  EuiPageContent,
+  EuiPageContentBody,
+  EuiPageHeader,
+  EuiPageHeaderSection,
+  EuiPanel,
+  EuiText,
+  EuiTitle,
+  EuiButton,
+} from '@elastic/eui';
+import {
+  ExpressionsStart,
+  ExpressionsInspectorAdapter,
+} from '../../../src/plugins/expressions/public';
+import { ExpressionEditor } from './editor/expression_editor';
+import { Start as InspectorStart } from '../../../src/plugins/inspector/public';
+
+interface Props {
+  expressions: ExpressionsStart;
+  inspector: InspectorStart;
+}
+
+export function RunExpressionsExample({ expressions, inspector }: Props) {
+  const [expression, updateExpression] = useState('markdown "## expressions explorer"');
+  const [result, updateResult] = useState({});
+
+  const expressionChanged = (value: string) => {
+    updateExpression(value);
+  };
+
+  const inspectorAdapters = useMemo(
+    () => ({
+      expression: new ExpressionsInspectorAdapter(),
+    }),
+    []
+  );
+
+  useEffect(() => {
+    const runExpression = async () => {
+      const execution = expressions.execute(expression, null, {
+        debug: true,
+        inspectorAdapters,
+      });
+
+      const data: any = await execution.getData();
+      updateResult(data);
+    };
+
+    runExpression();
+  }, [expression, expressions, inspectorAdapters]);
+
+  return (
+    <EuiPageBody>
+      <EuiPageHeader>
+        <EuiPageHeaderSection>
+          <EuiTitle size="l">
+            <h1>Run expressions</h1>
+          </EuiTitle>
+        </EuiPageHeaderSection>
+      </EuiPageHeader>
+      <EuiPageContent>
+        <EuiPageContentBody>
+          <EuiFlexGroup>
+            <EuiFlexItem>
+              <EuiText>
+                In the below editor you can enter your expression and execute it. Using
+                expressions.execute allows you to easily run the expression.
+              </EuiText>
+            </EuiFlexItem>
+            <EuiFlexItem>
+              <EuiButton
+                onClick={() => {
+                  inspector.open(inspectorAdapters);
+                }}
+              >
+                Open Inspector
+              </EuiButton>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+
+          <EuiFlexGroup gutterSize="l">
+            <EuiFlexItem>
+              <EuiPanel data-test-subj="expressionEditor" paddingSize="none" role="figure">
+                <ExpressionEditor value={expression} onChange={expressionChanged} />
+              </EuiPanel>
+            </EuiFlexItem>
+            <EuiFlexItem>
+              <EuiPanel paddingSize="none" role="figure">
+                <EuiCodeBlock
+                  language="json"
+                  fontSize="m"
+                  paddingSize="m"
+                  isCopyable
+                  data-test-subj="expressionResult"
+                >
+                  {JSON.stringify(result, null, '\t')}
+                </EuiCodeBlock>
+              </EuiPanel>
+            </EuiFlexItem>
+          </EuiFlexGroup>
+        </EuiPageContentBody>
+      </EuiPageContent>
+    </EuiPageBody>
+  );
+}

examples/expressions_explorer/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "./target",
+    "skipLibCheck": true
+  },
+  "include": [
+    "index.ts",
+    "public/**/*.ts",
+    "public/**/*.tsx",
+    "../../typings/**/*",
+  ],
+  "exclude": [],
+  "references": [
+    { "path": "../../src/core/tsconfig.json" },
+    { "path": "../../src/plugins/kibana_react/tsconfig.json" },
+  ]
+}

src/plugins/expressions/common/execution/execution.ts

@@ -29,6 +29,7 @@ import { getByAlias } from '../util/get_by_alias';
 import { ExecutionContract } from './execution_contract';
 import { ExpressionExecutionParams } from '../service';
 import { TablesAdapter } from '../util/tables_adapter';
+import { ExpressionsInspectorAdapter } from '../util/expressions_inspector_adapter';
 
 /**
  * AbortController is not available in Node until v15, so we
@@ -63,6 +64,7 @@ export interface ExecutionParams {
 const createDefaultInspectorAdapters = (): DefaultInspectorAdapters => ({
   requests: new RequestAdapter(),
   tables: new TablesAdapter(),
+  expression: new ExpressionsInspectorAdapter(),
 });
 
 export class Execution<
@@ -208,6 +210,9 @@ export class Execution<
     this.firstResultFuture.promise
       .then(
         (result) => {
+          if (this.context.inspectorAdapters.expression) {
+            this.context.inspectorAdapters.expression.logAST(this.state.get().ast);
+          }
           this.state.transitions.setResult(result);
         },
         (error) => {

src/plugins/expressions/common/util/expressions_inspector_adapter.ts

@@ -0,0 +1,22 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { EventEmitter } from 'events';
+
+export class ExpressionsInspectorAdapter extends EventEmitter {
+  private _ast: any = {};
+
+  public logAST(ast: any): void {
+    this._ast = ast;
+    this.emit('change', this._ast);
+  }
+
+  public get ast() {
+    return this._ast;
+  }
+}

src/plugins/expressions/common/util/index.ts

@@ -9,3 +9,4 @@
 export * from './create_error';
 export * from './get_by_alias';
 export * from './tables_adapter';
+export * from './expressions_inspector_adapter';

src/plugins/expressions/public/index.ts

@@ -107,4 +107,5 @@ export {
   ExpressionsServiceSetup,
   ExpressionsServiceStart,
   TablesAdapter,
+  ExpressionsInspectorAdapter,
 } from '../common';

src/plugins/expressions/public/public.api.md

@@ -551,6 +551,16 @@ export class ExpressionRenderHandler {
     update$: Observable<UpdateValue | null>;
     }
 
+// Warning: (ae-missing-release-tag) "ExpressionsInspectorAdapter" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
+//
+// @public (undocumented)
+export class ExpressionsInspectorAdapter extends EventEmitter {
+    // (undocumented)
+    get ast(): any;
+    // (undocumented)
+    logAST(ast: any): void;
+}
+
 // Warning: (ae-missing-release-tag) "ExpressionsPublicPlugin" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
 //
 // @public (undocumented)

test/examples/config.js

@@ -19,6 +19,7 @@ export default async function ({ readConfigFile }) {
       require.resolve('./ui_actions'),
       require.resolve('./state_sync'),
       require.resolve('./routing'),
+      require.resolve('./expressions_explorer'),
     ],
     services: {
       ...functionalConfig.get('services'),

test/examples/expressions_explorer/expressions.ts

@@ -0,0 +1,44 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import expect from '@kbn/expect';
+
+import { PluginFunctionalProviderContext } from 'test/plugin_functional/services';
+
+// eslint-disable-next-line import/no-default-export
+export default function ({ getService }: PluginFunctionalProviderContext) {
+  const testSubjects = getService('testSubjects');
+  const retry = getService('retry');
+  const browser = getService('browser');
+
+  describe('', () => {
+    it('runs expression', async () => {
+      await retry.try(async () => {
+        const text = await testSubjects.getVisibleText('expressionResult');
+        expect(text).to.be(
+          '{\n "type": "error",\n "error": {\n  "message": "Function markdown could not be found.",\n  "name": "fn not found"\n }\n}'
+        );
+      });
+    });
+
+    it('renders expression', async () => {
+      await retry.try(async () => {
+        const text = await testSubjects.getVisibleText('expressionRender');
+        expect(text).to.be('Function markdown could not be found.');
+      });
+    });
+
+    it('emits an action and navigates', async () => {
+      await testSubjects.click('testExpressionButton');
+      await retry.try(async () => {
+        const text = await browser.getCurrentUrl();
+        expect(text).to.be('https://www.google.com/?gws_rd=ssl');
+      });
+    });
+  });
+}

test/examples/expressions_explorer/index.ts

@@ -0,0 +1,28 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * and the Server Side Public License, v 1; you may not use this file except in
+ * compliance with, at your election, the Elastic License or the Server Side
+ * Public License, v 1.
+ */
+
+import { PluginFunctionalProviderContext } from 'test/plugin_functional/services';
+
+// eslint-disable-next-line import/no-default-export
+export default function ({
+  getService,
+  getPageObjects,
+  loadTestFile,
+}: PluginFunctionalProviderContext) {
+  const browser = getService('browser');
+  const PageObjects = getPageObjects(['common', 'header']);
+
+  describe('expressions explorer', function () {
+    before(async () => {
+      await browser.setWindowSize(1300, 900);
+      await PageObjects.common.navigateToApp('expressionsExplorer');
+    });
+
+    loadTestFile(require.resolve('./expressions'));
+  });
+}

x-pack/plugins/canvas/canvas_plugin_src/renderers/debug.tsx

@@ -26,9 +26,11 @@ export const debug: RendererFactory<any> = () => ({
 
     ReactDOM.render(renderDebug(), domNode, () => handlers.done());
 
-    handlers.onResize(() => {
-      ReactDOM.render(renderDebug(), domNode, () => handlers.done());
-    });
+    if (handlers.onResize) {
+      handlers.onResize(() => {
+        ReactDOM.render(renderDebug(), domNode, () => handlers.done());
+      });
+    }
 
     handlers.onDestroy(() => ReactDOM.unmountComponentAtNode(domNode));
   },