@likemex/fs-react-lib

Shared in-app AI assistant ("FS AI") chat widget for Next.js apps. REST + Server-Sent Events streaming. Drop-in panel + floating button + Next.js API proxy + Tailwind tokens.

Ships:

• <AssistantPanel> — slide-in chat drawer (general or course-aware modes).
• <AssistantNavButton> — toggle button (inline or floating FAB).
• <AssistantContextProvider> + useAssistant() — panel open/close state, persisted to localStorage.
• configureFsAi({ getToken }) — wires host app auth into the FS AI Axios client.
• createFsAiProxyHandler() — Next.js API route factory that proxies /api/fs-ai/** to the upstream origin and injects the server-only X-API-Key.
• Hooks: useAssistantConversation, useAssistantPhase, useAssistantStream.
• Helpers: buildLearningMetadata, canUseLearningAssistant, isFsAiApiConfigured, conversation history store, user-profile store, SSE decoder, markdown sanitizer.

Install

npm install @likemex/fs-react-lib
# or
pnpm add @likemex/fs-react-lib
# or
yarn add @likemex/fs-react-lib

Peer deps (install whichever your app uses):

• react ^17 || ^18 + react-dom ^17 || ^18
• next ^12 || ^13 || ^14
• axios >=0.24
• antd ^5 + @ant-design/cssinjs ^1
• @tanstack/react-query ^4
• react-icons ^4 || ^5
• react-markdown ^7 || ^8
• remark-gfm ^3 || ^4

Quick start (Next.js Pages Router)

1. Wire pages/_app.tsx

import {
    AssistantContextProvider,
    AssistantPanel,
    AssistantNavButton,
    configureFsAi,
} from '@likemex/fs-react-lib';
import { auth } from 'services/auth';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import { ConfigProvider, App as AntdApp } from 'antd';
import { StyleProvider } from '@ant-design/cssinjs';
import 'antd/dist/reset.css';

configureFsAi({ getToken: () => auth.getToken() ?? null });
const queryClient = new QueryClient();

export default function MyApp({ Component, pageProps }) {
    return (
        <ConfigProvider theme={{ token: { colorPrimary: '#842CDD' } }}>
            <AntdApp>
                <StyleProvider hashPriority="high">
                    <QueryClientProvider client={queryClient}>
                        <AssistantContextProvider>
                            <Component {...pageProps} />
                            <AssistantNavButton floating canUse />
                            <AssistantPanel surface="general" canUse />
                        </AssistantContextProvider>
                    </QueryClientProvider>
                </StyleProvider>
            </AntdApp>
        </ConfigProvider>
    );
}

2. Add the proxy route

pages/api/fs-ai/[[...slug]].ts:

import { createFsAiProxyHandler } from '@likemex/fs-react-lib';

export const config = { api: { bodyParser: false, responseLimit: false as const } };
export default createFsAiProxyHandler();

3. Tailwind tokens + content path

tailwind.config.js:

const assistantTokens = require('@likemex/fs-react-lib/tailwind-tokens');

module.exports = {
    content: [
        './pages/**/*.{js,ts,jsx,tsx}',
        './components/**/*.{js,ts,jsx,tsx}',
        // scan compiled lib so Tailwind picks up its classes
        './node_modules/@likemex/fs-react-lib/dist/**/*.{js,d.ts}',
    ],
    theme: {
        extend: {
            colors: {
                // merge into existing palette
                primaryFS: assistantTokens.primaryFS,
                pinkFS: assistantTokens.pinkFS,
                blackFS: assistantTokens.blackFS,
                successFS: assistantTokens.successFS,
            },
        },
    },
};

4. Next 12 ESM peer compat

The compiled lib is CJS but pulls in ESM-only peers (react-markdown@8, remark-gfm@3). Next 12 needs:

// next.config.js
const withTM = require('next-transpile-modules')(['@likemex/fs-react-lib']);

module.exports = withTM({
    experimental: { esmExternals: 'loose' },
    // ...rest of your config
});

Next 13+: replace next-transpile-modules with built-in transpilePackages: ['@likemex/fs-react-lib'].

5. Env vars

NEXT_PUBLIC_FS_AI_USE_PROXY=true
FS_AI_API_URL=https://<your-fs-ai-host>
FS_AI_X_API_KEY=<server-only-key>

Var	Side	Purpose
NEXT_PUBLIC_FS_AI_USE_PROXY	Client	"true" routes through the Next API proxy (recommended — keeps the API key server-side).
NEXT_PUBLIC_FS_AI_API_URL	Client	Direct upstream origin (when proxy disabled).
FS_AI_API_URL	Server	Upstream origin used by the proxy factory.
FS_AI_X_API_KEY	Server	X-API-Key header injected by the proxy. Never exposed to the browser.
NEXT_PUBLIC_LEARNING_ASSISTANT_SHOW_FOR_ALL	Client	Dev flag — show the assistant regardless of pass entitlement.

Modes

AssistantPanel accepts a modes prop. When modes.length === 1 the ModePicker screen is skipped — chat opens directly.

// Course-bound app (5-mode picker)
<AssistantPanel
    surface="watch"
    courseId={courseId}
    lessonId={lessonId}
    modes={['general', 'before_class', 'during_class', 'after_class', 'apply']}
/>

// General-only app (no picker, no course)
<AssistantPanel surface="general" />

courseId is optional. When omitted:

• learning_mode='general' is set at conversation creation.
• patchLearningMode is skipped.
• learning_state.course_id is omitted from message metadata.
• Conversation history is bucketed under surface='general' with courseId=null.

Server-side rendering

AssistantPanel uses TanStack Query and reads localStorage. For pages built with getStaticProps (SSG), wrap the panel with next/dynamic to skip server render:

import dynamic from 'next/dynamic';
const AssistantPanel = dynamic(
    () => import('@likemex/fs-react-lib').then(m => m.AssistantPanel),
    { ssr: false }
);

Pages using getServerSideProps or no data fetching do not need this — the QueryClientProvider in _app is sufficient.

API surface

import {
    // Components
    AssistantPanel,
    AssistantNavButton,
    AssistantContextProvider,
    Composer,
    MessageList,
    MessageBubble,
    ModePicker,
    SuggestedActions,
    WelcomeMessage,
    ASSISTANT_PANEL_WIDTH,
    SUGGESTED_ACTIONS_BY_MODE,

    // Context
    useAssistant,
    AssistantContext,

    // Auth + service
    configureFsAi,
    fsAiApi,

    // Hooks
    useAssistantConversation,
    useAssistantPhase,
    useAssistantStream,

    // Helpers
    buildLearningMetadata,
    canUseLearningAssistant,
    isFsAiApiConfigured,
    listAssistantConversations,
    upsertAssistantConversation,
    removeAssistantConversation,
    readAssistantFullPagePreference,
    writeAssistantFullPagePreference,
    readAssistantUserProfile,
    writeAssistantUserProfile,
    clearAssistantUserProfile,
    isAssistantUserProfileComplete,
    decodeSseDataPayload,
    extractTextFromStreamJson,
    filterDisplayableAssistantSources,
    sanitizeAssistantMarkdown,
    visibleStripped,
    isOrphanListMarkerLine,

    // Proxy factory
    createFsAiProxyHandler,
} from '@likemex/fs-react-lib';

Full type definitions in dist/index.d.ts.

Tailwind tokens subpath

// CommonJS (tailwind.config.js)
const tokens = require('@likemex/fs-react-lib/tailwind-tokens');
// → { primaryFS, pinkFS, blackFS, successFS }

Development

git clone https://github.com/LikeMeX/fs-react-lib.git
cd fs-react-lib
pnpm install
pnpm run build    # tsc → dist/
pnpm run lint     # tsc --noEmit

Publish (maintainers): tag a release, GitHub Action runs build + npm publish --provenance. See .github/workflows/publish.yaml.

License

MIT © LikeMeX