feat: add chrome.storage api mocks for storybook use (#141)

.storybook/preview.tsx

@@ -1,6 +1,6 @@
 import type { Preview } from '@storybook/react';
+import ExtensionRoot from '@views/components/common/ExtensionRoot/ExtensionRoot';
 import React from 'react';
-import ExtensionRoot from 'src/views/components/common/ExtensionRoot/ExtensionRoot';
 
 const preview: Preview = {
     parameters: {
@@ -14,11 +14,133 @@ const preview: Preview = {
     },
     decorators: [
         Story => (
+            <React.StrictMode>
                 <ExtensionRoot>
                     <Story />
                 </ExtensionRoot>
+            </React.StrictMode>
         ),
     ],
 };
 
+let localData = {};
+type ListenerFunction = (
+    changes: { [key: string]: chrome.storage.StorageChange },
+    areaName: chrome.storage.AreaName
+) => void;
+const localDataListeners = new Map<
+    ListenerFunction, // key to remove listener
+    (changes: { [key: string]: chrome.storage.StorageChange }) => void
+>();
+
+// mock chrome api
+globalThis.chrome = {
+    storage: {
+        local: {
+            /**
+             * Removes all items from storage.
+             * @param callback Optional.
+             * Callback on success, or on failure (in which case runtime.lastError will be set).
+             */
+            async clear() {
+                localData = {};
+            },
+            /**
+             * Gets one or more items from storage.
+             * @param keys A single key to get, list of keys to get, or a dictionary specifying default values.
+             * An empty list or object will return an empty result object. Pass in null to get the entire contents of storage.
+             * @return A Promise that resolves with an object containing items
+             */
+            async get(keys?: string | string[] | { [key: string]: any } | null) {
+                if (keys === null) {
+                    return localData;
+                }
+                if (Array.isArray(keys)) {
+                    return keys.reduce((acc, key) => {
+                        acc[key] = localData[key];
+                        return acc;
+                    }, {} as string); // funny types
+                }
+                if (typeof keys === 'string') {
+                    return { [keys]: localData[keys] };
+                }
+                return keys;
+            },
+            /**
+             * Gets the amount of space (in bytes) being used by one or more items.
+             * @param keys Optional. A single key or list of keys to get the total usage for. An empty list will return 0. Pass in null to get the total usage of all of storage.
+             * @param callback Callback with the amount of space being used by storage, or on failure (in which case runtime.lastError will be set).
+             * Parameter bytesInUse: Amount of space being used in storage, in bytes.
+             */
+            async getBytesInUse() {
+                return 0;
+            },
+            /**
+             * Removes one or more items from storage.
+             * @param keys A single key or a list of keys for items to remove.
+             * @param callback Optional.
+             * Callback on success, or on failure (in which case runtime.lastError will be set).
+             */
+            async remove(keys: string | string[]) {
+                if (Array.isArray(keys)) {
+                    keys.forEach(key => {
+                        for (const listener of localDataListeners.values()) {
+                            listener({ [key]: { oldValue: localData[key], newValue: undefined } });
+                        }
+
+                        delete localData[key];
+                    });
+                } else {
+                    for (const listener of localDataListeners.values()) {
+                        listener({ [keys]: { oldValue: localData[keys], newValue: undefined } });
+                    }
+
+                    delete localData[keys];
+                }
+            },
+            /**
+             * Sets multiple items.
+             * @param items An object which gives each key/value pair to update storage with. Any other key/value pairs in storage will not be affected.
+             * Primitive values such as numbers will serialize as expected. Values with a typeof "object" and "function" will typically serialize to {}, with the exception of Array (serializes as expected), Date, and Regex (serialize using their String representation).
+             * @param callback Optional.
+             * Callback on success, or on failure (in which case runtime.lastError will be set).
+             */
+            async set(items: { [key: string]: any }) {
+                for (const key in items) {
+                    const oldValue = localData[key];
+                    localData[key] = JSON.parse(JSON.stringify(items[key]));
+
+                    for (const listener of localDataListeners.values()) {
+                        listener({ [key]: { oldValue: oldValue, newValue: localData[key] } });
+                    }
+                }
+            },
+        },
+        onChanged: {
+            /**
+             * Registers an event listener callback to an event.
+             * @param callback Called when an event occurs. The parameters of this function depend on the type of event.
+             */
+            addListener(
+                listener: (
+                    changes: { [key: string]: chrome.storage.StorageChange },
+                    areaName: chrome.storage.AreaName
+                ) => void
+            ) {
+                localDataListeners.set(listener, (changes: { [key: string]: chrome.storage.StorageChange }) => {
+                    listener(changes, 'local');
+                });
+            },
+
+            /**
+             * Deregisters an event listener callback from an event.
+             * @param callback Listener that shall be unregistered.
+             */
+            removeListener(listener: ListenerFunction) {
+                localDataListeners.delete(listener);
+            },
+        },
+    },
+} as typeof chrome;
+
 export default preview;