Tech stack | learn

Every library below is declared in some workspace manifest — names, version ranges, and categories come from the data, and the build fails if the list drifts. "Used in" points at the folders that import each library.

Language and build

TypeScriptDeclared but not used in source

Compiles the workspace and type-checks every package.

Used in: Monorepo, Web, Flush worker, Database, Auth, Redis, UI

tsxDeclared but not used in source

Runs and watches TypeScript sources for development and tests.

Used in: HTTP server, WebSocket server, Flush worker, Database, Redis

@types/nodeDeclared but not used in source

Type declarations for Node.js built-ins.

Used in: Web, HTTP server, WebSocket server, Flush worker, Backend common, Database, Auth, Redis, Validations, UI

@types/reactDeclared but not used in source

Type declarations for React.

Used in: Web, UI

@types/react-domDeclared but not used in source

Type declarations for React DOM.

Used in: Web, UI

@types/expressDeclared but not used in source

Type declarations for Express.

Used in: HTTP server

@types/corsDeclared but not used in source

Type declarations for CORS.

Used in: HTTP server

@types/wsDeclared but not used in source

Type declarations for ws.

Used in: WebSocket server

@types/bcryptDeclared but not used in source

Type declarations for bcrypt.

Used in: Auth

@types/jsonwebtokenDeclared but not used in source

Type declarations for jsonwebtoken.

Used in: Auth

@types/pgDeclared but not used in source

Type declarations for node-postgres.

Used in: Database

Frontend framework

Next.js

Serves the editor, dashboard, and room pages.

Used in: Web

React

Renders the editor, dashboard, and room interface.

Used in: Web, UI

React DOM

Renders React trees into the browser document.

Used in: Web

UI and styling

Tailwind CSS

Utility styles for the editor stylesheets.

Used in: Web

Tailwind PostCSS pluginDeclared but not used in source

Wires Tailwind into the Next.js PostCSS build.

Used in: Web

State

JotaiDeclared but not used in source

Declared in apps/web but never imported in source.

Used in: Web

Realtime and queues

WebSocket server and test client for room transport.

Used in: WebSocket server

BullMQ

Durable flush queue between Redis and the worker.

Used in: Redis

ioredis

Redis client behind live snapshots and pub/sub.

Used in: Redis

Backend framework

Express

HTTP server behind the scenes, rooms, and library APIs.

Used in: HTTP server

CORS

Enables cross-origin requests from the web app.

Used in: HTTP server

Database and ORM

node-postgres

Postgres driver behind the database client pool.

Used in: Database

Prisma ORM

Typed query runtime behind the database client.

Used in: Database

Prisma CLIDeclared but not used in source

Command line behind the database migration scripts.

Used in: Database

Prisma CLI engineDeclared but not used in source

Engine behind the Prisma project config.

Used in: Database

Auth and email

Better Auth

Email sign-in, verification mail, and Google OAuth.

Used in: Auth

bcrypt

Hashes and verifies account passwords.

Used in: Auth

jsonwebtoken

Signs presence tickets and room invitations.

Used in: Auth

dotenv

Loads local environment files in development.

Used in: Database, Auth

Validation

Zod

Defines reusable request validation schemas.

Used in: HTTP server, Validations

Testing

Vitest

Runs the unit and regression test suites.

Used in: Web, Common, Engine, Backend common, Auth

Linting and formatting

ESLintDeclared but not used in source

Lints the codebase from the shared configs.

Used in: Web, UI, Tooling configs

ESLint JS configDeclared but not used in source

Recommended rules inside the base config.

Used in: Tooling configs

ESLint Prettier configDeclared but not used in source

Disables style rules that fight the formatter.

Used in: Tooling configs

Only-warn pluginDeclared but not used in source

Keeps every lint finding as a warning.

Used in: Tooling configs

React Hooks pluginDeclared but not used in source

Enforces the React hooks rules.

Used in: Tooling configs

Turbo pluginDeclared but not used in source

Guards against undeclared environment variables.

Used in: Tooling configs

Next.js ESLint pluginDeclared but not used in source

Next.js rules for linted apps.

Used in: Tooling configs

Next.js ESLint configDeclared but not used in source

Next.js lint rules for the web app.

Used in: Web

Babel ESLint parserDeclared but not used in source

Parses TypeScript for the shared lint config.

Used in: Tooling configs

Babel TypeScript presetDeclared but not used in source

Teaches the parser TypeScript syntax.

Used in: Tooling configs

Babel coreDeclared but not used in source

Babel core behind the TypeScript parser.

Used in: Tooling configs

GlobalsDeclared but not used in source

Browser and worker globals for linted files.

Used in: Tooling configs

PrettierDeclared but not used in source

Formats TypeScript and Markdown behind the format script.

Used in: Monorepo

Monorepo tooling

TurboDeclared but not used in source

Orchestrates workspace builds, tests, and development.

Used in: Monorepo

Dependencies as of commit b0026d9.

Sources: package.json, pnpm-workspace.yaml, turbo.json, apps/web/package.json, apps/http-server/package.json, apps/ws-server/package.json, apps/flush-worker/package.json (documented at commit b0026d9)