[ML] Move local storage utilities to package.

.github/CODEOWNERS

@@ -1072,7 +1072,9 @@ packages/shared-ux/storybook/mock @elastic/kibana-global-experience
 x-pack/packages/ml/agg_utils @elastic/ml-ui
 x-pack/packages/ml/aiops_components @elastic/ml-ui
 x-pack/packages/ml/aiops_utils @elastic/ml-ui
+x-pack/packages/ml/is_defined @elastic/ml-ui
 x-pack/packages/ml/is_populated_object @elastic/ml-ui
+x-pack/packages/ml/local_storage @elastic/ml-ui
 x-pack/packages/ml/nested_property @elastic/ml-ui
 x-pack/packages/ml/string_hash @elastic/ml-ui
 x-pack/packages/ml/url_state @elastic/ml-ui

package.json

@@ -350,7 +350,9 @@
     "@kbn/logging-mocks": "link:packages/kbn-logging-mocks",
     "@kbn/mapbox-gl": "link:packages/kbn-mapbox-gl",
     "@kbn/ml-agg-utils": "link:x-pack/packages/ml/agg_utils",
+    "@kbn/ml-is-defined": "link:x-pack/packages/ml/is_defined",
     "@kbn/ml-is-populated-object": "link:x-pack/packages/ml/is_populated_object",
+    "@kbn/ml-local-storage": "link:x-pack/packages/ml/local_storage",
     "@kbn/ml-nested-property": "link:x-pack/packages/ml/nested_property",
     "@kbn/ml-string-hash": "link:x-pack/packages/ml/string_hash",
     "@kbn/ml-url-state": "link:x-pack/packages/ml/url_state",

tsconfig.base.json

@@ -816,8 +816,12 @@
       "@kbn/maps-plugin/*": ["x-pack/plugins/maps/*"],
       "@kbn/ml-agg-utils": ["x-pack/packages/ml/agg_utils"],
       "@kbn/ml-agg-utils/*": ["x-pack/packages/ml/agg_utils/*"],
+      "@kbn/ml-is-defined": ["x-pack/packages/ml/is_defined"],
+      "@kbn/ml-is-defined/*": ["x-pack/packages/ml/is_defined/*"],
       "@kbn/ml-is-populated-object": ["x-pack/packages/ml/is_populated_object"],
       "@kbn/ml-is-populated-object/*": ["x-pack/packages/ml/is_populated_object/*"],
+      "@kbn/ml-local-storage": ["x-pack/packages/ml/local_storage"],
+      "@kbn/ml-local-storage/*": ["x-pack/packages/ml/local_storage/*"],
       "@kbn/ml-nested-property": ["x-pack/packages/ml/nested_property"],
       "@kbn/ml-nested-property/*": ["x-pack/packages/ml/nested_property/*"],
       "@kbn/ml-plugin": ["x-pack/plugins/ml"],

x-pack/packages/ml/is_defined/README.md

@@ -0,0 +1,3 @@
+# @kbn/ml-is-defined
+
+Utility function to determine if a value is not `undefined` and not `null`.

x-pack/plugins/ml/public/application/contexts/storage/index.ts → x-pack/packages/ml/is_defined/index.ts

@@ -5,4 +5,4 @@
  * 2.0.
  */
 
-export { MlStorageContextProvider, useStorage } from './storage_context';
+export { isDefined } from './src/is_defined';

x-pack/plugins/ml/common/types/guards.ts → x-pack/packages/ml/is_defined/jest.config.js

@@ -5,6 +5,8 @@
  * 2.0.
  */
 
-export function isDefined<T>(argument: T | undefined | null): argument is T {
-  return argument !== undefined && argument !== null;
-}
+module.exports = {
+  preset: '@kbn/test',
+  rootDir: '../../../..',
+  roots: ['<rootDir>/x-pack/packages/ml/is_defined'],
+};

x-pack/packages/ml/is_defined/kibana.jsonc

@@ -0,0 +1,5 @@
+{
+  "type": "shared-common",
+  "id": "@kbn/ml-is-defined",
+  "owner": "@elastic/ml-ui"
+}

x-pack/packages/ml/is_defined/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "@kbn/ml-is-defined",
+  "private": true,
+  "version": "1.0.0",
+  "license": "SSPL-1.0 OR Elastic License 2.0"
+}

x-pack/plugins/data_visualizer/public/application/common/util/is_defined.ts → x-pack/packages/ml/is_defined/src/is_defined.ts

@@ -5,6 +5,12 @@
  * 2.0.
  */
 
+/**
+ * Checks whether the supplied argument is not `undefined` and not `null`.
+ *
+ * @param argument
+ * @returns boolean
+ */
 export function isDefined<T>(argument: T | undefined | null): argument is T {
   return argument !== undefined && argument !== null;
 }

x-pack/packages/ml/is_defined/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "extends": "../../../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "target/types",
+    "types": [
+      "jest",
+      "node",
+      "react"
+    ]
+  },
+  "include": [
+    "**/*.ts",
+      "**/*.tsx",
+  ],
+  "exclude": [
+    "target/**/*"
+  ],
+  "kbn_references": []
+}

x-pack/packages/ml/local_storage/README.md

@@ -0,0 +1,3 @@
+# @kbn/ml-local-storage
+
+Utilities to combine url state management with local storage.

x-pack/packages/ml/local_storage/index.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
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+export { StorageContextProvider, useStorage } from './src/storage_context';

x-pack/packages/ml/local_storage/jest.config.js

@@ -0,0 +1,12 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+module.exports = {
+  preset: '@kbn/test',
+  rootDir: '../../../..',
+  roots: ['<rootDir>/x-pack/packages/ml/local_storage'],
+};

x-pack/packages/ml/local_storage/kibana.jsonc

@@ -0,0 +1,5 @@
+{
+  "type": "shared-common",
+  "id": "@kbn/ml-local-storage",
+  "owner": "@elastic/ml-ui"
+}

x-pack/packages/ml/local_storage/package.json

@@ -0,0 +1,9 @@
+{
+  "name": "@kbn/ml-local-storage",
+  "description": "Utilities to combine url state management with local storage.",
+  "author": "Machine Learning UI",
+  "homepage": "https://docs.elastic.dev/kibana-dev-docs/api/kbn-ml-local-storage",
+  "private": true,
+  "version": "1.0.0",
+  "license": "SSPL-1.0 OR Elastic License 2.0"
+}

x-pack/packages/ml/local_storage/src/storage_context.tsx

@@ -0,0 +1,193 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+import React, {
+  type PropsWithChildren,
+  useEffect,
+  useMemo,
+  useCallback,
+  useState,
+  useContext,
+} from 'react';
+import { omit } from 'lodash';
+
+import type { Storage } from '@kbn/kibana-utils-plugin/public';
+import { isDefined } from '@kbn/ml-is-defined';
+
+/**
+ * StorageDefinition is a dictionary with `string` based keys.
+ */
+interface StorageDefinition {
+  [key: string]: unknown;
+}
+
+/**
+ * TStorage, a partial `StorageDefinition` or `null`.
+ */
+type TStorage = Partial<StorageDefinition> | null;
+/**
+ * TStorageKey, keys of StorageDefintion.
+ */
+type TStorageKey = keyof Exclude<TStorage, null>;
+/**
+ * TStorageMapped, mapping of TStorage with TStorageKey.
+ */
+type TStorageMapped<T extends TStorageKey> = T extends string ? unknown : null;
+
+/**
+ * StorageAPI definition of store TStorage with accessors.
+ */
+interface StorageAPI {
+  value: TStorage;
+  setValue: <K extends TStorageKey, T extends TStorageMapped<K>>(key: K, value: T) => void;
+  removeValue: <K extends TStorageKey>(key: K) => void;
+}
+
+/**
+ * Type guard to check if a supplied `key` is in `storageKey`.
+ *
+ * @param key
+ * @param storageKeys
+ * @returns boolean
+ */
+export function isStorageKey<T>(key: unknown, storageKeys: readonly T[]): key is T {
+  return storageKeys.includes(key as T);
+}
+
+/**
+ * React context to hold storage API.
+ */
+export const MlStorageContext = React.createContext<StorageAPI>({
+  value: null,
+  setValue() {
+    throw new Error('MlStorageContext set method is not implemented');
+  },
+  removeValue() {
+    throw new Error('MlStorageContext remove method is not implemented');
+  },
+});
+
+/**
+ * Props for StorageContextProvider
+ */
+interface StorageContextProviderProps<K extends TStorageKey> {
+  storage: Storage;
+  storageKeys: readonly K[];
+}
+
+/**
+ * Provider to manage context for the `useStorage` hook.
+ */
+export function StorageContextProvider<K extends TStorageKey, T extends TStorage>({
+  children,
+  storage,
+  storageKeys,
+}: PropsWithChildren<StorageContextProviderProps<K>>) {
+  const initialValue = useMemo(() => {
+    return storageKeys.reduce((acc, curr) => {
+      acc[curr as K] = storage.get(curr as string);
+      return acc;
+    }, {} as Exclude<T, null>);
+  }, [storage, storageKeys]);
+
+  const [state, setState] = useState<T>(initialValue);
+
+  const setStorageValue = useCallback(
+    <TM extends TStorageMapped<K>>(key: K, value: TM) => {
+      storage.set(key as string, value);
+
+      setState((prevState) => ({
+        ...prevState,
+        [key]: value,
+      }));
+    },
+    [storage]
+  );
+
+  const removeStorageValue = useCallback(
+    (key: K) => {
+      storage.remove(key as string);
+      setState((prevState) => omit(prevState, key) as T);
+    },
+    [storage]
+  );
+
+  useEffect(
+    function updateStorageOnExternalChange() {
+      const eventListener = (event: StorageEvent) => {
+        if (!isStorageKey(event.key, storageKeys)) return;
+
+        if (isDefined(event.newValue)) {
+          setState((prev) => {
+            return {
+              ...prev,
+              [event.key as K]:
+                typeof event.newValue === 'string' ? JSON.parse(event.newValue) : event.newValue,
+            };
+          });
+        } else {
+          setState((prev) => omit(prev, event.key as K) as T);
+        }
+      };
+
+      /**
+       * This event listener is only invoked when
+       * the change happens in another browser's tab.
+       */
+      window.addEventListener('storage', eventListener);
+
+      return () => {
+        window.removeEventListener('storage', eventListener);
+      };
+    },
+    [storageKeys]
+  );
+
+  const value = useMemo(() => {
+    return {
+      value: state,
+      setValue: setStorageValue,
+      removeValue: removeStorageValue,
+    } as StorageAPI;
+  }, [state, setStorageValue, removeStorageValue]);
+
+  return <MlStorageContext.Provider value={value}>{children}</MlStorageContext.Provider>;
+}
+
+/**
+ * Hook for consuming a storage value
+ * @param key
+ * @param initValue
+ */
+export function useStorage<K extends TStorageKey, T extends TStorageMapped<K>>(
+  key: K,
+  initValue?: T
+): [
+  typeof initValue extends undefined ? T | undefined : Exclude<T, undefined>,
+  (value: T) => void
+] {
+  const { value, setValue, removeValue } = useContext(MlStorageContext);
+
+  const resultValue = useMemo(() => {
+    return (value?.[key] ?? initValue) as typeof initValue extends undefined
+      ? T | undefined
+      : Exclude<T, undefined>;
+  }, [value, key, initValue]);
+
+  const setVal = useCallback(
+    (v: T) => {
+      if (isDefined(v)) {
+        setValue(key, v);
+      } else {
+        removeValue(key);
+      }
+    },
+    [setValue, removeValue, key]
+  );
+
+  return [resultValue, setVal];
+}

x-pack/packages/ml/local_storage/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "extends": "../../../../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "target/types",
+    "types": [
+      "jest",
+      "node",
+      "react"
+    ]
+  },
+  "include": [
+    "**/*.ts",
+      "**/*.tsx",
+  ],
+  "exclude": [
+    "target/**/*",
+  ],
+  "kbn_references": [
+    "@kbn/kibana-utils-plugin",
+    "@kbn/ml-is-defined",
+  ]
+}

x-pack/plugins/aiops/kibana.json

@@ -16,6 +16,6 @@
     "licensing"
   ],
   "optionalPlugins": [],
-  "requiredBundles": ["fieldFormats", "kibanaReact"],
+  "requiredBundles": ["fieldFormats", "kibanaReact", "kibanaUtils"],
   "extraPublicDirs": ["common"]
 }