2021 was a year of accelerated restructuring across the frontend ecosystem: Vue 3 completed its ecosystem, Angular 12/13 finished the Ivy migration, and Vite went from an emerging tool to a mainstream choice. Standing at the end of 2021, let's predict what will happen in 2022.

React 18: Concurrent Rendering Is Here

React 18 released its Alpha in June 2021, and the stable version is expected in early 2022. The most important change is concurrent rendering — React can interrupt rendering to prioritize more urgent updates:

// React 18 新特性：useTransition
function SearchPage() {
  const [query, setQuery] = useState("");
  const [results, setResults] = useState([]);
  const [isPending, startTransition] = useTransition();

  const handleSearch = (e) => {
    const value = e.target.value;
    setQuery(value); // 立即更新输入框（高优先级）

    startTransition(() => {
      // 标记为低优先级，可被中断
      setResults(performHeavySearch(value));
    });
  };

  return (
    <>
      <input value={query} onChange={handleSearch} />
      {isPending ? <Spinner /> : <ResultList results={results} />}
    </>
  );
}

Other new React 18 APIs:

• useDeferredValue: like startTransition, but for values rather than functions
• useId: generates a stable unique ID (SSR-hydration safe)
• Suspense list ordering (SuspenseList)
• Streaming SSR (renderToPipeableStream)

Vue 3 Becomes the Default

In Q1 2022, Vue 3 will become the default version installed by npm install vue (today it's still Vue 2). This means:

# 2022 年之后
npm install vue   # 安装 Vue 3（目前会安装 Vue 2）
npm install vue@2  # 明确指定 Vue 2

Vue 3's ecosystem filled in its last few missing pieces in 2021:

• Pinia became the recommended state-management solution (replacing Vuex)
• Vue Router 4 stabilized
• Nuxt 3 Beta released (built on Vue 3 + Vite)

Vite Becomes the Go-To Build Tool

After Vite 2 shipped in 2021, adoption rose sharply. In 2022 it is expected to become the first choice for new projects:

// vite.config.ts
import { defineConfig } from "vite";
import vue from "@vitejs/plugin-vue";
import react from "@vitejs/plugin-react";

export default defineConfig({
  plugins: [vue()], // 或 react()
  build: {
    rollupOptions: {
      output: {
        // 自动代码分割
        manualChunks: {
          vendor: ["vue", "vue-router", "pinia"],
        },
      },
    },
  },
});

Vite vs Webpack cold-start comparison (medium project):

Webpack 5（with cache）：~6s
Vite：~300ms

原因：Vite 开发模式不打包，直接利用浏览器原生 ESM

Rise of Meta-Frameworks

2022 will be the breakout year for meta-frameworks:

Framework	Based on	Status (early 2022)
Next.js 12	React	Production-stable, #1 market share
Nuxt 3	Vue 3 + Vite	RC stage
SvelteKit	Svelte	Beta
Remix	React	Open-sourced Nov 2021
Astro	Framework-agnostic	Beta

Remix deserves special attention — it rethinks how data loading works:

// Remix 的 loader 函数：在服务端运行，数据直接注入组件
export async function loader({ params }) {
  const post = await db.post.findUnique({ where: { id: params.id } });
  return json(post);
}

export default function Post() {
  const post = useLoaderData();  // 自动是服务端数据
  return <article>{post.content}</article>;
}

TypeScript Continues to Penetrate Deeper

TypeScript's downloads grew about 60% year over year in 2021; for 2022 we expect:

• Vue 3's official docs to go fully TypeScript
• the satisfies operator (TS 4.9 draft, for more precise type checking)
• more frameworks to treat TypeScript as a first-class citizen

Summary

The main theme of frontend in 2022 is maturity — React 18's concurrent rendering, Vue 3's complete ecosystem, Vite becoming standard, and the divergence of meta-frameworks. The seeds planted in 2021 (Vite, SolidJS, Remix) will bear fruit in 2022. For frontend developers, the most worthwhile investments are: a deep understanding of concurrent rendering, familiarity with the Vite ecosystem, and taking TypeScript type design seriously. Here's to writing better code in 2022.