After the release of React 20, the entire ecosystem has undergone a dramatic reshuffling. Many once-indispensable libraries have been replaced by native APIs, and new tooling is redefining the development experience. This article maps the state of the React ecosystem in early 2025 to help you make informed technology decisions.

State Management: Who Still Needs Redux?

React 20's useActionState, Compiler auto-memoization, and improved Context bring most state management needs back to native solutions.

// State management decision tree for 2025

// Scenario 1: Server state -> TanStack Query
import { useSuspenseQuery } from "@tanstack/react-query";
function UserProfile({ id }) {
  const { data } = useSuspenseQuery({
    queryKey: ["user", id],
    queryFn: () => fetchUser(id),
  });
  return <Profile user={data} />;
}

// Scenario 2: Form / form interaction state -> React native
import { useField, Form } from "react";
function LoginForm() {
  const email = useField({ name: "email" });
  const password = useField({ name: "password" });
  return <Form action={handleLogin}>...</Form>;
}

// Scenario 3: Global UI state (theme, sidebar) -> Context + useSyncExternalStore
import { useSyncExternalStore } from "react";
const themeStore = {
  subscribe: (cb) => {
    /* ... */ return () => {};
  },
  getSnapshot: () => currentTheme,
};
function ThemeToggle() {
  const theme = useSyncExternalStore(
    themeStore.subscribe,
    themeStore.getSnapshot,
  );
  return (
    <button onClick={toggleTheme}>{theme === "dark" ? "🌙" : "☀️"}</button>
  );
}

// Scenario 4: Complex client state (collaborative editing, games) -> Zustand
import { create } from "zustand";
const useEditorStore = create((set) => ({
  nodes: [],
  selectedId: null,
  addNode: (node) => set((s) => ({ nodes: [...s.nodes, node] })),
  selectNode: (id) => set({ selectedId: id }),
}));

Zustand remains the go-to for complex client state in 2025, with a clean API and full compatibility with the React 20 Compiler. Jotai and Recoil are gradually fading; native Context + useSyncExternalStore can now satisfy most atomic state needs.

Build Tools: Vite + Rspack as Dual Champions

// vite.config.ts - Recommended 2025 configuration
import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
import { reactCompiler } from "react-compiler-vite";

export default defineConfig({
  plugins: [react(), reactCompiler()],
  build: {
    target: "es2022",
    rollupOptions: {
      output: {
        // Better caching with import maps
        manualChunks: {
          "react-vendor": ["react", "react-dom"],
          router: ["@tanstack/react-router"],
        },
      },
    },
  },
});

// rspack.config.js - The choice when Webpack compatibility is needed
const { defineConfig } = require("@rspack/core");
const { ReactCompilerRspackPlugin } = require("react-compiler-rspack");

module.exports = defineConfig({
  plugins: [new ReactCompilerRspackPlugin()],
  experiments: {
    rspackFuture: {
      newIncremental: true, // incremental compilation
    },
  },
});

Rspack 2.0 excels at migrating large Webpack projects with 98% API compatibility. Vite 6 remains the first choice for greenfield projects — its cold start speed is unrivaled.

CSS Solutions: Zero Runtime Is King

// Comparison of CSS approaches for 2025

// ✅ Recommended: CSS Modules (zero runtime, native support)
import styles from "./Button.module.css";
function Button({ children }) {
  return <button className={styles.primary}>{children}</button>;
}

// ✅ Recommended: Tailwind CSS 4 + Oxide engine
// 10x faster builds, no more PostCSS required
function Card({ title, description }) {
  return (
    <div className="rounded-lg border p-4 hover:shadow-lg transition-shadow">
      <h3 className="text-lg font-semibold">{title}</h3>
      <p className="text-gray-600 mt-1">{description}</p>
    </div>
  );
}

// ⚠️ Use with caution: CSS-in-JS (has runtime overhead)
// styled-components and Emotion are still maintained, but not recommended for new projects

// ✅ New option: StyleX (from Meta, compile-time CSS-in-JS)
import { stylex } from "@stylexjs/react";
const styles = stylex.create({
  base: { padding: 16, borderRadius: 8 },
  primary: { backgroundColor: "#3b82f6", color: "white" },
});
function Button({ children }) {
  return (
    <button {...stylex.props(styles.base, styles.primary)}>{children}</button>
  );
}

Testing and AI Tools

// Vitest + Testing Library is the standard testing combination for 2025
import { render, screen } from "@testing-library/react";
import { expect, test } from "vitest";
import UserProfile from "./UserProfile";

test("renders user name", () => {
  render(<UserProfile user={{ name: "张三", role: "admin" }} />);
  expect(screen.getByText("张三")).toBeInTheDocument();
  expect(screen.getByText("管理员")).toBeInTheDocument();
});

// AI-assisted toolchain
// - Cursor / Claude Code: code generation and refactoring
// - v0.dev (Vercel): UI component generation
// - GitHub Copilot Workspace: automation from Issue to PR

Summary

• State management returns to native solutions: TanStack Query for server state, Zustand for complex client state, Context for everything else
• Build tools: Vite 6 is the first choice for new projects; Rspack 2.0 is the best migration path from Webpack
• CSS solutions: CSS Modules and Tailwind 4 are mainstream; StyleX is the future of CSS-in-JS
• Testing: Vitest + Testing Library has fully replaced Jest + RTL
• AI tools have become a standard part of the development workflow, but core architecture decisions still require engineers' judgment