Adds Redux and React-Intl to storybook (#35094)

.storybook/preview.tsx

@@ -0,0 +1,136 @@
+import { useEffect, useState } from 'react';
+
+import { IntlProvider } from 'react-intl';
+
+import { configureStore } from '@reduxjs/toolkit';
+import { Provider } from 'react-redux';
+
+import type { Preview } from '@storybook/react-vite';
+import { http, passthrough } from 'msw';
+import { initialize, mswLoader } from 'msw-storybook-addon';
+
+import type { LocaleData } from '@/mastodon/locales';
+import { reducerWithInitialState, rootReducer } from '@/mastodon/reducers';
+import { defaultMiddleware } from '@/mastodon/store/store';
+
+// If you want to run the dark theme during development,
+// you can change the below to `/application.scss`
+import '../app/javascript/styles/mastodon-light.scss';
+
+const localeFiles = import.meta.glob('@/mastodon/locales/*.json', {
+  query: { as: 'json' },
+});
+
+// Initialize MSW
+initialize();
+
+const preview: Preview = {
+  // Auto-generate docs: https://storybook.js.org/docs/writing-docs/autodocs
+  tags: ['autodocs'],
+  globalTypes: {
+    locale: {
+      description: 'Locale for the story',
+      toolbar: {
+        title: 'Locale',
+        icon: 'globe',
+        items: Object.keys(localeFiles).map((path) =>
+          path.replace('/mastodon/locales/', '').replace('.json', ''),
+        ),
+        dynamicTitle: true,
+      },
+    },
+  },
+  initialGlobals: {
+    locale: 'en',
+  },
+  decorators: [
+    (Story, { parameters }) => {
+      const { state = {} } = parameters;
+      let reducer = rootReducer;
+      if (typeof state === 'object' && state) {
+        reducer = reducerWithInitialState(state as Record<string, unknown>);
+      }
+      const store = configureStore({
+        reducer,
+        middleware(getDefaultMiddleware) {
+          return getDefaultMiddleware(defaultMiddleware);
+        },
+      });
+      return (
+        <Provider store={store}>
+          <Story />
+        </Provider>
+      );
+    },
+    (Story, { globals }) => {
+      const currentLocale = (globals.locale as string) || 'en';
+      const [messages, setMessages] = useState<
+        Record<string, Record<string, string>>
+      >({});
+      const currentLocaleData = messages[currentLocale];
+
+      useEffect(() => {
+        async function loadLocaleData() {
+          const { default: localeFile } = (await import(
+            `@/mastodon/locales/${currentLocale}.json`
+          )) as { default: LocaleData['messages'] };
+          setMessages((prevLocales) => ({
+            ...prevLocales,
+            [currentLocale]: localeFile,
+          }));
+        }
+        if (!currentLocaleData) {
+          void loadLocaleData();
+        }
+      }, [currentLocale, currentLocaleData]);
+
+      return (
+        <IntlProvider
+          locale={currentLocale}
+          messages={currentLocaleData}
+          textComponent='span'
+        >
+          <Story />
+        </IntlProvider>
+      );
+    },
+  ],
+  loaders: [mswLoader],
+  parameters: {
+    layout: 'centered',
+
+    controls: {
+      matchers: {
+        color: /(background|color)$/i,
+        date: /Date$/i,
+      },
+    },
+
+    a11y: {
+      // 'todo' - show a11y violations in the test UI only
+      // 'error' - fail CI on a11y violations
+      // 'off' - skip a11y checks entirely
+      test: 'todo',
+    },
+
+    state: {},
+
+    // Force docs to use an iframe as it breaks MSW handlers.
+    // See: https://github.com/mswjs/msw-storybook-addon/issues/83
+    docs: {
+      story: {
+        inline: false,
+      },
+    },
+
+    msw: {
+      handlers: [
+        http.get('/index.json', passthrough),
+        http.get('/packs-dev/*', passthrough),
+        http.get('/sounds/*', passthrough),
+      ],
+    },
+  },
+};
+
+export default preview;