Incremental builds for Vite

Correct incremental build for Vite: content hashing, dependency graph, parent invalidation.

Use case

Projects that need to be built to disk instead of being served by the Vite dev server. If you can, the recommended approach is to use CSP to allow localhost in dev and use the Vite dev server without this plugin.

Installation

npm i -D vite-incra tsx

Usage

1. Add the plugin to vite.config.ts

import { defineConfig } from 'vite'
import { incrementalBuild } from 'vite-incra'

export default defineConfig({
	plugins: [
		// ... your other plugins (react, vue, etc.)
		incrementalBuild({
			bundleName: 'bundle',
			watcherIgnoredFiles: [/node_modules/, /\.git/, /dist/],
			beforeBuildCallback: () => {
				/* runs before each build */
			},
			cleanBeforeFirstBuild: true,
			watch: true,
			watcherUsePolling: true,
		}),
	],
	root: '.',
	build: {
		outDir: 'dist',
		emptyOutDir: true,
	},
})

2. Add script to package.json

{
	"scripts": {
		"build": "vite build",
		"build:incremental": "vite-incra"
	}
}

3. Run

npm run build:incremental

Or without adding a script:

npx vite-incra

• Watch mode (default): Watches src/, public/, index.html and rebuilds only when files change.
• Single run: Pass watch: false to the plugin if you run from CI and want one build then exit.
• Force build: With watch: false, use vite-incra --force to build even when no changes are detected.

Project structure

project/
├── index.html
├── package.json
├── vite.config.ts
├── src/
│   ├── main.tsx      # or main.ts, main.js
│   └── ...
├── public/
│   └── ...
└── dist/             # output

Requirements

• vite.config must have root set
• If you set build.rollupOptions.input, it must be an object (e.g. { main: 'index.html' }), not a string or array

Advanced: Programmatic usage

For custom scripts (e.g. tools/incrementalBuild.ts):

import { runIncrementalBuild, patchConfig } from 'vite-incra'
import viteConfig from '../vite.config'

runIncrementalBuild(patchConfig(viteConfig), {
	watch: false,
	force: true,  // build even when no changes detected
	bundleName: 'bundle',
	watcherIgnoredFiles: [/node_modules/, /\.git/],
	beforeBuildCallback: () => {
		/* ... */
	},
})

Requires tsx for running TypeScript:

npm i -D vite-incra tsx

Notes

• Extensions: Don't use this package. Build minimal files for install, serve JS from Vite dev server, allow localhost in CSP.
• File remapping: Use Vite middleware for build path remapping.
• Tested: React (TypeScript + JavaScript).
• Build speed: Depends on how many files the changed file imports. More imports = longer incremental build.

Acknowledgments

Inspired by momentumdash/vite-plugin-incremental-build.