# The Modern JavaScript Build Toolchain
## Introduction
The JS ecosystem has evolved rapidly. Here’s what actually matters in 2026.
## The Stack
### Bundlers
– **Vite** – Development speed, HMR
– **esbuild** – Extreme speed
– **Rollup** – Library builds
### Package Managers
– **pnpm** – Disk space, monorepos
– **bun** – Speed, built-in everything
## Why Vite
“`bash
npm create vite@latest my-app — –template react
“`
– Native ESM
– Instant HMR
– Optimized production builds
## Build Configuration
“`javascript
// vite.config.js
export default {
build: {
rollupOptions: {
output: {
manualChunks: {
vendor: [‘react’, ‘react-dom’],
}
}
}
}
}
“`
## TypeScript Integration
“`bash
npm install -D typescript @types/react
tsc –init
“`
## Conclusion
Vite + pnpm + TypeScript is the current standard stack. Simplicity wins.