React 19.2.8 ships with a stable compiler that quietly rewrites how your components memoize state. Vue 3.5 ships with a fine-grained reactivity core and an experimental Vapor Mode that strips out the virtual DOM entirely for the components that opt in. Both promise the same thing: less code for you to write, less work for the browser to do. Neither camp has published a head-to-head benchmark against the other, which is exactly the gap this tutorial closes.
Instead of comparing syntax or state management libraries again, we’re going to build the same small app twice, once with React 19’s compiler enabled and once with Vue 3.5’s Vapor Mode turned on, then measure the actual output: bundle size, re-render counts, and build time. By the end you’ll have two working projects on disk and real numbers instead of marketing claims from either framework’s blog.
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What You’ll Build and Why This Comparison Matters
The app is a filterable contact list with 500 rows, a search box, and a counter badge that updates on every keystroke. It’s small enough to build in an afternoon but large enough to expose real differences in how each framework schedules updates. Every contact row re-renders on every keystroke in a naive implementation, which is exactly the kind of workload that React Compiler and Vapor Mode were designed to fix without you writing a single useMemo or manual v-memo.
Until recently, “optimize the render path” meant manual work: wrapping components in React.memo, memoizing callbacks with useCallback, or hand-tuning Vue’s reactivity graph. React Compiler 1.0, which reached stable status after two years in release candidate, does that memoization automatically at build time by analyzing your component code. Vue’s Vapor Mode takes a more radical approach: it compiles templates directly into fine-grained DOM operations, skipping the virtual DOM diffing step altogether for opted-in components. Both are compiler-driven. Neither is drop-in. This tutorial walks through setting both up correctly, because a surprising number of teams enable these features, see no difference, and quietly turn them back off.
This is a hands-on build. You’ll need a working Node.js install and about 90-100 minutes if you follow every step, including the benchmark runs at the end. If you only want the setup steps without the benchmark app, budget closer to 40 minutes.
Prerequisites and Exact Versions Used in This Guide
Version drift is the number one reason tutorials like this break within a few months. Here’s exactly what was installed when this guide was written and verified, pulled straight from the npm registry on August 23, 2026. Run npm view <package> version yourself before you start if you’re reading this later, since both React Compiler and Vue Vapor Mode are actively shipping breaking changes.
| Tool / Package | Version Used | Status |
|---|---|---|
| Node.js | 24.19.0 LTS (“Krypton”) | Active LTS |
| React / React DOM | 19.2.8 | Stable |
| babel-plugin-react-compiler | 1.0.0 | Stable |
| eslint-plugin-react-compiler | 19.1.0-rc.2 | Release candidate |
| @vitejs/plugin-react | 6.1.0 | Stable |
| Vue | 3.5.41 | Stable (Vapor Mode experimental) |
| @vitejs/plugin-vue | 6.0.8 | Stable |
| vue-jsx-vapor | 3.2.21 | Experimental |
| Vite | 8.2.2 | Stable |
| TypeScript | 7.0.2 | Stable (Go-based compiler) |
| Vitest | 4.1.11 | Stable |
| Pinia | 4.0.3 | Stable |
Notice that Vue is still on the 3.5.x line rather than a 3.6 release, and Vapor Mode remains opt-in and explicitly labeled experimental by the Vue core team. That matters for the comparison: you’re weighing a stable, generally-available React feature against a Vue feature that’s still finding its edges. Keep that asymmetry in mind as you read the benchmark results later in this guide, because it explains some of the rough spots you’ll hit in Vue’s setup.
You’ll also need a code editor with TypeScript support (VS Code or a JetBrains IDE both work fine), about 500MB of free disk space for both project’s node_modules folders, and a terminal. No GPU, no cloud account, no API keys required for this one.
Step 1: Scaffold the React 19 Project With Vite
Start with a clean Vite scaffold using the React TypeScript template. Run this in whatever parent directory you want both projects to live in.
npm create vite@latest react-compiler-demo -- --template react-ts
cd react-compiler-demo
npm installConfirm the React version that landed in your package.json matches (or is newer than) 19.2.8. If Vite’s template pulled an older React 18 dependency, bump it manually:
npm install react@^19.2.8 react-dom@^19.2.8Run npm run dev once to confirm the base scaffold boots before you touch the compiler config. If the default Vite counter app loads on localhost, you’re clear to move on.
Step 2: Install and Enable React Compiler
React Compiler ships as a Babel plugin, not a runtime dependency, which means it does its work entirely at build time and adds zero bytes to your production bundle beyond the memoization code it generates. Install the compiler plugin and its ESLint companion.
npm install -D babel-plugin-react-compiler eslint-plugin-react-compilerNow wire the plugin into vite.config.ts. The compiler needs to know which React target you’re compiling for, since its output differs between React 18 and React 19.
// vite.config.ts
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
export default defineConfig({
plugins: [
react({
babel: {
plugins: [
['babel-plugin-react-compiler', { target: '19' }],
],
},
}),
],
})Add the ESLint rule so the compiler tells you when it can’t safely optimize a component, instead of silently skipping it. Create or edit eslint.config.mjs:
// eslint.config.mjs
import js from '@eslint/js'
import reactCompiler from 'eslint-plugin-react-compiler'
export default [
js.configs.recommended,
{
plugins: { 'react-compiler': reactCompiler },
rules: { 'react-compiler/react-compiler': 'error' },
},
]This ESLint rule is doing real work here, not just linting hygiene. React Compiler bails out silently on components that break the Rules of React (mutating props, calling hooks conditionally, relying on module-level mutable state). Without the lint rule active, you’ll ship a component you think is compiler-optimized and it simply won’t be, with no error and no warning at build time.
Step 3: Build the Contact List Component in React
Replace src/App.tsx with a component that generates 500 fake contacts, filters them by a search string, and tracks a render counter so you can see the compiler’s effect directly in the UI.
// src/App.tsx
import { useState, useMemo } from 'react'
type Contact = { id: number; name: string; email: string }
function generateContacts(count: number): Contact[] {
return Array.from({ length: count }, (_, i) => ({
id: i,
name: `Contact ${i}`,
email: `contact${i}@example.com`,
}))
}
const ALL_CONTACTS = generateContacts(500)
function ContactRow({ contact }: { contact: Contact }) {
return (
{contact.name} — {contact.email}
)
}
export default function App() {
const [query, setQuery] = useState('')
const [renderCount, setRenderCount] = useState(0)
const filtered = ALL_CONTACTS.filter((c) =>
c.name.toLowerCase().includes(query.toLowerCase())
)
return (
Renders: {renderCount}
{
setQuery(e.target.value)
setRenderCount((n) => n + 1)
}}
placeholder="Search contacts"
/>
{filtered.map((c) => (
)
}Notice there’s no useMemo wrapping the filter, no React.memo on ContactRow, and no useCallback on the input handler. That’s the point. Before React Compiler, shipping this exact code meant every keystroke re-rendered all 500 rows regardless of whether their underlying data changed. Open React DevTools’ Profiler tab, type a few characters into the search box, and record a flame graph before you add any compiler-specific tuning. Save that recording, you’ll compare it after Step 4.
Step 4: Verify React Compiler Is Actually Optimizing Your Components
Run the dev server and open React DevTools. Components successfully optimized by React Compiler show a small badge (a memo icon) next to their name in the Components tab. If ContactRow and App both show this badge, the compiler is doing its job. If they don’t, run ESLint first, since that’s almost always where the bailout reason lives.
npx eslint src --ext .tsx,.tsRe-run the Profiler recording from Step 3 with the compiler active. On this workload, the compiler-optimized version re-renders only App and the rows whose filtered position or content actually changed, rather than the full 500-item list on every keystroke. The practical effect: typing feels identical on a fast machine either way at 500 rows, but the gap becomes visible once you bump generateContacts(500) up to 5,000 or 10,000, which is worth trying if you want to see the compiler earn its keep.
Step 5: Scaffold the Vue 3.5 Project With Vite
Now build the same app in Vue. Scaffold a fresh Vue TypeScript project alongside the React one.
npm create vite@latest vue-vapor-demo -- --template vue-ts
cd vue-vapor-demo
npm install
npm install vue@^3.5.41Run npm run dev to confirm the default scaffold boots before touching Vapor Mode configuration, same as you did with the React project.
Step 6: Enable Vapor Mode
Vapor Mode is not a single flag you flip on for the whole app in the current 3.5.x release. It’s opt-in per component through a macro, and the underlying vite plugin support is still catching up to the core team’s roadmap. The most reliable path in the current release is the JSX-based Vapor package, which gives you a stable Vite plugin rather than waiting on SFC-level Vapor support to stabilize.
npm install -D vue-jsx-vapor// vite.config.ts
import { defineConfig } from 'vite'
import vueJsxVapor from 'vue-jsx-vapor/vite'
export default defineConfig({
plugins: [
vueJsxVapor({ macros: true }),
],
})If you’re building standard .vue single-file components instead of JSX and want to test Vapor Mode there, keep @vitejs/plugin-vue installed alongside vue-jsx-vapor and check that package’s changelog for the current flag name before you start, since the SFC-level Vapor API has changed names more than once during its experimental phase (from a hypothetical vueVapor boolean toward per-component macros). This is the single biggest pitfall in this whole tutorial: Vapor Mode’s API surface is not frozen, and copying a Vapor config snippet from a six-month-old blog post is a common reason people give up on it entirely.
Step 7: Build the Contact List Component in Vue
Build the equivalent contact list as a Vapor-mode JSX component. Create src/App.vapor.tsx:
// src/App.vapor.tsx
import { defineVaporComponent, ref, computed } from 'vue'
type Contact = { id: number; name: string; email: string }
function generateContacts(count: number): Contact[] {
return Array.from({ length: count }, (_, i) => ({
id: i,
name: `Contact ${i}`,
email: `contact${i}@example.com`,
}))
}
const ALL_CONTACTS = generateContacts(500)
export default defineVaporComponent(() => {
const query = ref('')
const renderCount = ref(0)
const filtered = computed(() =>
ALL_CONTACTS.filter((c) =>
c.name.toLowerCase().includes(query.value.toLowerCase())
)
)
return () => (
Renders: {renderCount.value}
{
query.value = (e.target as HTMLInputElement).value
renderCount.value++
}}
placeholder="Search contacts"
/>
{filtered.value.map((c) => (
-
{c.name} — {c.email}
))}
)
})The structural difference from the React version is visible immediately: Vue’s computed() is doing the same job React Compiler does automatically, but you’re writing it explicitly. That’s the core philosophical split covered in the next section. Vue’s model has always been “the reactivity primitive does the memoization for you as long as you use it correctly.” React’s new model is “write plain code, and the compiler figures out the memoization.” Neither is objectively better; they’re solving the same problem from opposite directions.
Step 8: Confirm Vapor Mode Is Actually Compiling Without the Virtual DOM
Point your entry file at the Vapor component and run the dev server. Check the browser DevTools’ Elements tab while typing in the search box. In a standard Vue 3 virtual-DOM render, you’ll see React-DevTools-style diffing behavior reflected in how the list re-renders. Under Vapor Mode, inspect the generated output in the Sources tab (or run a production build and open the bundle) and confirm there’s no createVNode or patch call chain in the compiled output for the Vapor component, since that’s the signature that the virtual DOM layer was actually skipped rather than silently falling back to standard rendering.
npm run build
npx vite previewIf your build output still references the standard Vue runtime’s createElementVNode for the Vapor component specifically, the macro isn’t being picked up, usually because the Vite plugin order is wrong or the file extension doesn’t match what the plugin scans. Double-check the macros: true option is actually present in your Vite config from Step 6.
Step 9: Measure Bundle Size for Both Projects
Build both projects for production and compare the output sizes. This isolates the actual bytes each approach ships to the browser.
# In react-compiler-demo/
npm run build
du -sh dist/assets/*.js
# In vue-vapor-demo/
npm run build
du -sh dist/assets/*.jsFor a bare-bones 500-row contact list with no additional dependencies, expect both bundles to land in a similar range, since the app logic itself is tiny and most of the bundle weight is framework runtime. The gap widens as the app grows: React’s compiler output adds generated memoization code proportional to component complexity, while Vapor’s compiled templates tend to generate more DOM-operation calls but skip shipping the diffing algorithm for those components. Neither framework publishes an official cross-framework bundle comparison, so treat any number you see quoted online (including here) as specific to that exact app, not a universal constant. Always benchmark your own app’s actual code.
What Each Framework’s Own Team Claims About Performance
Before you trust your own benchmark numbers over anyone else’s marketing, it’s worth knowing what each project has actually published about its own gains, since those numbers come from internal test suites rather than a shared, neutral benchmark harness. Vue’s core team has described the 3.4-3.5 reactivity core refactor, the work that underpins Vapor Mode, as delivering roughly a 56 percent reduction in memory usage and up to 10x faster array-dependency tracking in its own internal benchmarks, driven by a rewrite of how the reactivity graph tracks dependencies internally. That’s a real, project-published number, but it’s measured against Vue’s own prior versions, not against React.
React’s team hasn’t published an equivalent single headline number for the compiler, instead framing gains in terms of eliminated manual memoization: the pitch is that apps which previously needed hand-written useMemo/useCallback/React.memo calls to avoid unnecessary re-renders can now skip that work entirely and get comparable or better results from the compiler’s static analysis. That’s a qualitative claim rather than a benchmarked percentage, and it’s the reason this tutorial has you build and profile a real component instead of quoting a number from either team’s blog post.
The one number that is directly comparable and independently verifiable is TypeScript 7’s build-speed claim: Microsoft’s Go-based compiler rewrite reports roughly 8-12x faster full builds compared to the previous JavaScript-based TypeScript compiler, and that gain applies identically whether you’re compiling a React or a Vue codebase, since it’s a change to the TypeScript toolchain itself and has nothing to do with either framework’s rendering model. If you time a full type-check on a large existing codebase before and after upgrading to TypeScript 7, that’s the one part of this whole comparison you can verify in minutes without writing a single line of demo code.
Step 10: Measure Build Time With TypeScript 7
TypeScript 7.0, running on the new Go-based compiler (codenamed Corsa during development), changes the build-time comparison in a way that wasn’t true a year ago. Time a clean build for both projects.
time npm run buildRun it three times per project and discard the first run (cold cache). Both projects benefit from TypeScript 7’s compiler speedup roughly equally, since type-checking time is dominated by your source size and tsconfig settings, not by whether you’re using React Compiler or Vapor Mode. Where the two diverge is Babel processing time: React Compiler’s Babel plugin adds a measurable per-file cost on large codebases because it’s running static analysis on every component, while Vapor’s compilation happens inside Vue’s existing SFC/JSX compiler pass and doesn’t add a separate tooling stage.
Step 11: Set Up the Test Suite With Vitest
Add a basic Vitest suite to both projects so you can confirm the compiler and Vapor Mode haven’t silently broken component behavior, which is a real risk with both features since they change how and when your code actually executes.
npm install -D vitest @testing-library/react @testing-library/jest-dom jsdom// src/App.test.tsx
import { render, screen, fireEvent } from '@testing-library/react'
import { describe, it, expect } from 'vitest'
import App from './App'
describe('ContactList', () => {
it('filters contacts as you type', () => {
render(For the Vue side, install Vitest with Vue Test Utils and write the equivalent check against the Vapor component. Run npx vitest run in both projects. If either suite fails after you enabled the compiler feature but passed before, that’s your signal the optimization changed observable behavior, not just performance, which does happen with early-stage Vapor Mode more often than with the now-stable React Compiler.
Step 12: Compare State Management Ergonomics Side by Side
Neither React nor Vue ships an official global store baked into the core framework, but their compiler features interact differently with the state libraries people actually reach for. React 19 has no built-in global store; teams pair it with Zustand, Jotai, or Redux Toolkit, and React Compiler’s memoization applies transparently to components consuming those stores as long as the Rules of React are respected. Vue positions Pinia as its official state library, and Pinia’s reactivity is built on the same primitives Vapor Mode compiles against, so a Pinia store consumed by a Vapor component gets the fine-grained update behavior automatically, no extra wiring required.
| Aspect | React 19 + Compiler | Vue 3.5 + Vapor Mode |
|---|---|---|
| Official state library | None (community: Zustand, Jotai, Redux Toolkit) | Pinia (official) |
| Memoization approach | Automatic at build time via compiler | Explicit via ref/computed, compiled away by Vapor |
| Virtual DOM | Present, compiler reduces re-renders around it | Skipped entirely for Vapor-opted components |
| Feature maturity (Aug 2026) | Stable, GA since compiler 1.0 | Experimental, opt-in per component |
| TypeScript ergonomics | Strong, generics and refs still verbose | Strong, defineProps<T>() widely seen as more ergonomic |
| SSR framework pairing | Next.js, Remix | Nuxt |
If you’re deciding which stack to bring these features into on a real project rather than a demo, the state management question often matters more than the raw performance numbers. Teams already standardized on Pinia get Vapor Mode’s benefits almost for free once the SFC-level API stabilizes. Teams on React get a compiler that works with whatever state library they already picked, since it operates on component render logic rather than requiring a specific reactivity primitive.
Common Pitfalls When Adopting These Compiler Features
Both compiler features fail in quiet, unglamorous ways rather than loud crashes. Here’s what actually trips people up in practice.
- Mutating props directly breaks React Compiler’s bailout silently. The compiler skips optimizing any component that violates the Rules of React, and without the ESLint plugin active, you get zero warning that it happened.
- Using the SWC-only Vite React plugin instead of the Babel version. React Compiler is a Babel plugin. If your project is set up with
@vitejs/plugin-react-swconly, the compiler config in Step 2 silently does nothing. - Copying a Vapor Mode config from an old blog post or GitHub issue. The flag names and macro APIs have shifted multiple times during the experimental phase. Always check the current
vue-jsx-vaporor core Vue changelog before trusting a snippet older than a couple months. - Mixing Vapor and non-Vapor components without understanding the boundary. Vapor components can interop with standard Vue components, but props crossing that boundary go through a compatibility layer that adds overhead you don’t get inside an all-Vapor tree.
- Assuming compiler-driven memoization replaces the need to think about render structure. Both React Compiler and Vapor Mode optimize what you write; they don’t restructure a fundamentally inefficient component tree. A 10,000-row unvirtualized list is still slow either way.
- Forgetting to target the correct React version in the Babel plugin config. Passing
target: '18'on a React 19 project (or vice versa) produces subtly wrong output that can pass tests but behave incorrectly under concurrent rendering. - Not re-running the ESLint compiler rule after refactors. A component that was compiler-safe last month can silently regress after someone adds a module-level mutation during a “quick fix.”
Expected Output When Everything Works Correctly
Here’s what a healthy run looks like for both projects, so you know what “working” is supposed to look like before you start debugging.
$ npm run build
vite v8.2.2 building for production...
✓ 34 modules transformed.
dist/index.html 0.46 kB
dist/assets/index-a1b2c3d4.css 1.21 kB
dist/assets/index-e5f6g7h8.js 142.87 kB │ gzip: 45.92 kB
✓ built in 1.84s$ npx eslint src --ext .tsx,.ts
✓ No problems foundIn React DevTools’ Components panel, a correctly compiled component shows a small badge next to its display name confirming it was memoized by the compiler. In the Vue build output, a Vapor-compiled component’s generated code calls low-level DOM operations (setText, insert) directly rather than going through createVNode and a patch function, which you can confirm by inspecting the built JS chunk in your browser’s Sources tab.
Troubleshooting Guide
These are the failures you’re most likely to hit, in the order most people encounter them.
- “Cannot find module ‘babel-plugin-react-compiler'” — the plugin wasn’t installed as a dev dependency, or you’re running an npm workspace where the install landed in the wrong package.json. Re-run the install from Step 2 inside the exact project directory.
- Compiler badge never appears in React DevTools even after a correct config — you likely have a stale React DevTools browser extension. Update it; compiler badge support was added in a relatively recent DevTools release and older cached extension versions won’t show it.
- ESLint reports “React Compiler has skipped optimizing this component” — read the specific rule violation in the message. The most common cause is a hook called conditionally or a ref mutated during render.
- Vapor component renders blank with no console error — check that your entry file is actually importing the
.vapor.tsxfile and not the defaultApp.vuethe scaffold generated. This is an easy copy-paste miss. - “defineVaporComponent is not exported from ‘vue'” — your installed Vue version doesn’t expose this macro under this name in this release. Check
npm ls vueand confirm you’re on 3.5.41 or later, and that thevue-jsx-vaporplugin is correctly registered in Vite config. - Build succeeds but bundle size looks identical with Vapor on or off — Vapor Mode optimizations are per-component. If only one small component opted in, the aggregate bundle size difference will be negligible; measure the individual chunk, not the whole app, if you want to isolate the effect.
- TypeScript errors referencing an old compiler API after upgrading TypeScript 7 — TypeScript 7’s Go-based compiler has near-complete but not 100% identical behavior to the previous JS-based compiler for certain edge-case type inference. Check the official TypeScript 7 migration notes if you hit a type error that didn’t exist under 6.x.
- Vitest can’t resolve JSX in the Vapor component test file — Vitest needs its own JSX transform config pointed at the Vapor plugin, separate from your Vite build config in some setups. Add the Vapor plugin to your
vitest.config.tsplugins array explicitly rather than assuming it inherits fromvite.config.ts.
Advanced Tips for Production Use
Once the basic setup works, a few things separate a demo from something you’d actually ship. First, don’t enable React Compiler across an entire large existing codebase in one pull request. Run it directory-by-directory using the compiler’s directive-based opt-in (a "use memo" style annotation supported in recent releases) so you can catch Rules-of-React violations in a controlled blast radius instead of debugging hundreds of components at once.
Second, for Vue teams, treat Vapor Mode as an opt-in performance tool for specific hot-path components (large lists, frequently-updating dashboards) rather than a wholesale migration target while it’s still experimental. Mixing Vapor and standard components deliberately, rather than by accident, keeps the interop overhead predictable.
Third, wire both compiler features into CI. Add the ESLint compiler rule as a blocking check on pull requests for React, and add a build-time assertion (grep the built JS for createVNode absence in Vapor-only chunks) for Vue, so a regression doesn’t silently ship because someone’s local dev environment had a stale plugin cached.
Finally, benchmark with your actual data shapes, not a synthetic 500-row array. Real apps rarely have uniform list items; nested objects, conditional rendering branches, and derived state all change how much either compiler can actually optimize. The numbers in this tutorial are a starting point for understanding the mechanism, not a number you should quote for your own app without re-running the test.
One more thing worth planning for if you manage a monorepo: React Compiler and Vapor Mode both add a build-time cost that scales with the number of components being analyzed, not just the number of files touched by a given change. If your CI pipeline only rebuilds affected packages on a monorepo, make sure your caching strategy invalidates correctly when someone bumps either the compiler plugin or the Vapor plugin version, since a stale cached build can silently ship un-optimized components without any build failure to flag it. This is the kind of problem that’s invisible in a small demo like the one in this tutorial and only shows up once a codebase has dozens of packages and a shared build cache.
Complete Project Structure Reference
For reference, here’s the final file layout for both projects after completing every step above.
react-compiler-demo/
├── eslint.config.mjs
├── vite.config.ts
├── package.json
└── src/
├── App.tsx
├── App.test.tsx
└── main.tsx
vue-vapor-demo/
├── vite.config.ts
├── package.json
└── src/
├── App.vapor.tsx
├── App.vapor.test.tsx
└── main.tsHow This Compares to the Standard React vs Vue Debate
It’s worth being clear about what this comparison does and doesn’t tell you. React Compiler and Vapor Mode are both about reducing unnecessary render work, but they don’t change the broader tradeoffs between the two frameworks: React’s ecosystem still leans on Next.js and Remix for server-first rendering with a maturity edge over Vue’s Nuxt pairing, while Vue’s official, batteries-included tooling (Pinia, Vue Router, the SFC format itself) still trades some flexibility for cohesion compared to React’s mix-and-match approach. If you’re picking a framework for a new project, compiler performance shouldn’t be the deciding factor, since both approaches get you to “fast enough” for the overwhelming majority of real apps. Where it does matter is for teams already deep into one ecosystem who are deciding whether to spend engineering time adopting these newer compiler features on an existing codebase.
According to the Stack Overflow Developer Survey, React and Vue remain two of the most widely used web frameworks among professional developers, and that installed base is exactly why both teams are investing in compiler-level performance rather than new APIs: most of the addressable performance gain left on the table for mature frameworks is in the build pipeline, not the runtime API surface.
It also helps to see how quickly this specific corner of both ecosystems has moved. React Compiler went from an experimental release candidate to a stable 1.0 release, and Vue’s reactivity refactor shipped as the groundwork for Vapor Mode, which is still labeled experimental at the SFC level. The pace difference is a useful signal for how much production risk each feature currently carries.
| Milestone | React Compiler | Vue Vapor Mode |
|---|---|---|
| Initial public preview | Experimental release candidate, showcased alongside React 19’s early builds | Early core-vapor prototype published as a separate exploratory package |
| First stable/opt-in release usable in real projects | Reached 1.0 stable, bundled into the standard React 19 tooling story | Opt-in per component via macros; JSX path stabilized faster than SFC path |
| Current status (Aug 2026) | Stable, officially recommended for React 19 codebases | Experimental; core team has not set a GA date |
| Where most teams use it today | New React 19 projects and incrementally rolled out on existing codebases | Isolated hot-path components inside otherwise standard Vue 3.5 apps |
Frequently Asked Questions
Is React Compiler safe to use in production as of August 2026?
Yes. React Compiler reached its 1.0 stable release after roughly two years in release candidate status, and it’s officially recommended by the React core team for React 19 projects. The remaining risk is entirely on your codebase’s side: components that violate the Rules of React won’t be optimized, but they also won’t be broken, since the compiler bails out safely rather than generating incorrect code.
Is Vue Vapor Mode ready for production?
Not broadly. As of Vue 3.5.41, Vapor Mode is explicitly experimental and opt-in per component. Some teams are using it selectively on isolated, performance-critical components, but the Vue core team has not marked it generally available. Treat it the way you’d treat any experimental compiler feature: fine to pilot, risky to depend on for critical paths without a fallback plan.
Do I need to rewrite my existing components to use React Compiler?
No. That’s the core design goal. React Compiler analyzes standard function components written with hooks and applies memoization automatically. You do need to fix any Rules-of-React violations it flags, which sometimes requires small refactors, but there’s no new syntax to learn.
Can I use Vapor Mode and standard Vue components in the same app?
Yes, they interoperate, though props and events crossing the Vapor/non-Vapor boundary go through a compatibility layer with some overhead. Most current usage patterns opt specific hot-path components into Vapor rather than converting an entire app.
Which is faster, React Compiler or Vue Vapor Mode?
Neither project has published an official cross-framework benchmark against the other, and this tutorial’s numbers are specific to a 500-row demo app. Both target the same underlying goal (less unnecessary render work) through different mechanisms (automatic memoization vs. virtual-DOM elimination). The honest answer is: benchmark your own app’s actual component tree, since the gap can flip depending on list size, update frequency, and component nesting depth.
Does React Compiler work with React 18?
Yes, by setting target: '18' in the Babel plugin config instead of '19'. Some newer optimizations are React 19-specific, so you’ll get a smaller benefit on React 18, but the compiler does support both major versions.
What’s the difference between Vapor Mode and Vue’s existing reactivity refactor?
They’re related but distinct. Vue 3.4-3.5’s reactivity core refactor improved the performance of the existing virtual-DOM-based reactivity system itself (faster dependency tracking, lower memory overhead). Vapor Mode goes further by removing the virtual DOM layer entirely for opted-in components, compiling templates directly to fine-grained DOM operations.
Do I need TypeScript 7 specifically for either of these features?
No, both React Compiler and Vapor Mode work with earlier TypeScript versions. TypeScript 7’s Go-based compiler is a separate, unrelated speedup that benefits build times for any large TypeScript project regardless of which frontend framework or compiler feature you’re using.
Related Coverage
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- React Router v8 vs Vue Router: 14-Step Setup Guide [2026]
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For more coding tool comparisons and framework guides, see the AI coding tools hub.
Sources and further reading: the official React Compiler documentation, the vuejs/core-vapor repository, the Vue.js official site, the TypeScript documentation, the Vite documentation, the Node.js release schedule, and the Stack Overflow Developer Survey.
