feat(ui): lazy load monaco in runtime (#15978)

ui/global.d.ts

@@ -2,4 +2,3 @@
 // got some globals here that only exist during compilation
 //
 
-declare var ENABLE_MONACO: string

ui/src/shared/utils/featureFlag.ts

@@ -5,6 +5,7 @@ const OSS_FLAGS = {
   alerting: false,
   eventMarkers: false,
   deleteWithPredicate: false,
+  monacoEditor: false,
   downloadCellCSV: false,
 }
 
@@ -12,12 +13,14 @@ const CLOUD_FLAGS = {
   alerting: true,
   eventMarkers: false,
   deleteWithPredicate: false,
+  monacoEditor: false,
   cloudBilling: CLOUD_BILLING_VISIBLE, // should be visible in dev and acceptance, but not in cloud
   downloadCellCSV: false,
 }
 
-export const isFlagEnabled = (flagName: string) => {
+export const isFlagEnabled = (flagName: string, equals?: string | boolean) => {
   let localStorageFlags
+  let _equals = equals
 
   try {
     localStorageFlags = JSON.parse(window.localStorage.featureFlags)
@@ -25,25 +28,86 @@ export const isFlagEnabled = (flagName: string) => {
     localStorageFlags = {}
   }
 
-  return (
-    localStorageFlags[flagName] === true ||
-    (CLOUD && CLOUD_FLAGS[flagName]) ||
-    (!CLOUD && OSS_FLAGS[flagName])
-  )
+  if (_equals === undefined) {
+    _equals = true
+  }
+
+  if (localStorageFlags.hasOwnProperty(flagName)) {
+    return localStorageFlags[flagName] === _equals
+  }
+
+  if (CLOUD) {
+    if (CLOUD_FLAGS.hasOwnProperty(flagName)) {
+      return CLOUD_FLAGS[flagName] === _equals
+    }
+
+    return false
+  }
+
+  if (OSS_FLAGS.hasOwnProperty(flagName)) {
+    return OSS_FLAGS[flagName] === _equals
+  }
+
+  return false
 }
 
 // type influx.toggleFeature('myFlag') to disable / enable any feature flag
-export const FeatureFlag: FunctionComponent<{name: string}> = ({
-  name,
-  children,
-}) => {
-  if (!isFlagEnabled(name)) {
+export const FeatureFlag: FunctionComponent<{
+  name: string
+  equals?: string | boolean
+}> = ({name, equals, children}) => {
+  if (!isFlagEnabled(name, equals)) {
     return null
   }
 
   return children as any
 }
 
+/* eslint-disable no-console */
+const list = () => {
+  console.log('Currently Available Feature Flags')
+  if (CLOUD) {
+    console.table(CLOUD_FLAGS)
+  } else {
+    console.table(OSS_FLAGS)
+  }
+}
+/* eslint-enable no-console */
+
+const reset = () => {
+  const featureFlags = JSON.parse(window.localStorage.featureFlags || '{}')
+
+  if (CLOUD) {
+    Object.keys(featureFlags).forEach(k => {
+      if (!CLOUD_FLAGS.hasOwnProperty(k)) {
+        delete featureFlags[k]
+      } else {
+        featureFlags[k] = CLOUD_FLAGS[k]
+      }
+    })
+  } else {
+    Object.keys(featureFlags).forEach(k => {
+      if (!CLOUD_FLAGS.hasOwnProperty(k)) {
+        delete featureFlags[k]
+      } else {
+        featureFlags[k] = CLOUD_FLAGS[k]
+      }
+    })
+  }
+
+  window.localStorage.featureFlags = JSON.stringify(featureFlags)
+}
+
+export const set = (flagName: string, value: string | boolean) => {
+  const featureFlags = JSON.parse(window.localStorage.featureFlags || '{}')
+
+  featureFlags[flagName] = value
+
+  window.localStorage.featureFlags = JSON.stringify(featureFlags)
+
+  return featureFlags[flagName]
+}
+
 export const toggleLocalStorageFlag = (flagName: string) => {
   const featureFlags = JSON.parse(window.localStorage.featureFlags || '{}')
 
@@ -57,4 +121,4 @@ export const toggleLocalStorageFlag = (flagName: string) => {
 // Expose utility in dev tools console for convenience
 const w: any = window
 
-w.influx = {toggleFeature: toggleLocalStorageFlag}
+w.influx = {toggleFeature: toggleLocalStorageFlag, list, reset}

ui/src/timeMachine/components/TimeMachineFluxEditor.scss

@@ -25,3 +25,20 @@
   width: 100%;
   height: 100%;
 }
+
+.time-machine-editor--loading {
+  width: 100%;
+  height: 100%;
+  position: relative;
+  background: #292933;
+
+  &:after {
+    content: '';
+    position: absolute;
+    background: #202028;
+    top: 8px;
+    bottom: 8px;
+    left: 24px;
+    right: 8px;
+  }
+}

ui/src/timeMachine/components/TimeMachineFluxEditor.tsx

@@ -1,14 +1,18 @@
 // Libraries
-import React, {PureComponent} from 'react'
+import React, {PureComponent, Suspense} from 'react'
 import {connect} from 'react-redux'
 import {Position} from 'codemirror'
 
 // Components
-import FluxEditor from 'src/shared/components/FluxEditor'
+const FluxEditor = React.lazy(() => import('src/shared/components/FluxEditor'))
+const FluxMonacoEditor = React.lazy(() =>
+  import('src/shared/components/FluxMonacoEditor')
+)
 import Threesizer from 'src/shared/components/threesizer/Threesizer'
 import FluxFunctionsToolbar from 'src/timeMachine/components/fluxFunctionsToolbar/FluxFunctionsToolbar'
 import VariableToolbar from 'src/timeMachine/components/variableToolbar/VariableToolbar'
 import ToolbarTab from 'src/timeMachine/components/ToolbarTab'
+import {FeatureFlag} from 'src/shared/utils/featureFlag'
 
 // Actions
 import {setActiveQueryText} from 'src/timeMachine/actions'
@@ -40,6 +44,8 @@ interface State {
 
 type Props = StateProps & DispatchProps
 
+const spinner = <div className="time-machine-editor--loading" />
+
 class TimeMachineFluxEditor extends PureComponent<Props, State> {
   private cursorPosition: Position = {line: 0, ch: 0}
 
@@ -55,27 +61,29 @@ class TimeMachineFluxEditor extends PureComponent<Props, State> {
         size: 0.75,
         handleDisplay: HANDLE_NONE,
         render: () => {
-          if (ENABLE_MONACO) {
-            const FluxMonacoEditor = require('src/shared/components/FluxMonacoEditor')
-              .default
-            return (
-              <FluxMonacoEditor
-                script={activeQueryText}
-                onChangeScript={onSetActiveQueryText}
-                onSubmitScript={onSubmitQueries}
-                onCursorChange={this.handleCursorPosition}
-              />
-            )
-          }
           return (
-            <FluxEditor
-              script={activeQueryText}
-              status={{type: '', text: ''}}
-              onChangeScript={onSetActiveQueryText}
-              onSubmitScript={onSubmitQueries}
-              suggestions={[]}
-              onCursorChange={this.handleCursorPosition}
-            />
+            <>
+              <Suspense fallback={spinner}>
+                <FeatureFlag name="monacoEditor">
+                  <FluxMonacoEditor
+                    script={activeQueryText}
+                    onChangeScript={onSetActiveQueryText}
+                    onSubmitScript={onSubmitQueries}
+                    onCursorChange={this.handleCursorPosition}
+                  />
+                </FeatureFlag>
+                <FeatureFlag name="monacoEditor" equals={false}>
+                  <FluxEditor
+                    script={activeQueryText}
+                    status={{type: '', text: ''}}
+                    onChangeScript={onSetActiveQueryText}
+                    onSubmitScript={onSubmitQueries}
+                    suggestions={[]}
+                    onCursorChange={this.handleCursorPosition}
+                  />
+                </FeatureFlag>
+              </Suspense>
+            </>
           )
         },
       },

ui/webpack.common.ts

@@ -109,9 +109,6 @@ module.exports = {
     }),
     new ForkTsCheckerWebpackPlugin(),
     new webpack.ProgressPlugin(),
-    new webpack.DefinePlugin({
-      ENABLE_MONACO: JSON.stringify(false)
-    }),
     new webpack.EnvironmentPlugin({...process.env, GIT_SHA, API_PREFIX: API_BASE_PATH, STATIC_PREFIX: BASE_PATH}),
   ],
   stats: {