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import { fileURLToPath, URL } from 'node:url'

import { copyFile, readFile } from 'node:fs/promises'

import { join } from 'node:path'

import { defineConfig } from 'vite'

import vue from '@vitejs/plugin-vue'

import vueJsx from '@vitejs/plugin-vue-jsx'

import vueDevTools from 'vite-plugin-vue-devtools'

import { VitePWA } from 'vite-plugin-pwa'

import { visualizer } from 'rollup-plugin-visualizer'

import autoprefixer from 'autoprefixer'

import tailwind from 'tailwindcss'

import { isSameOriginDeferredAssetRequest } from './src/pwa/deferredAssetPolicy'

import { resolveDeploymentBase } from './vite.deployment-base'

const deploymentBase = resolveDeploymentBase(process.env.VITE_DEPLOY_BASE)

/**

* GitHub Pages only serves files and otherwise responds with `404.html`. Keep a

* copy of Vite's generated shell at that path so history-mode Vue routes can

* boot directly without rewriting the visitor's URL.

*/

function githubPagesSpaFallback() {

return {

name: 'github-pages-spa-fallback',

async writeBundle(outputOptions: { dir?: string }) {

const outputDirectory = outputOptions.dir ?? 'dist'

await copyFile(join(outputDirectory, 'index.html'), join(outputDirectory, '404.html'))

},

}

}

// https://vite.dev/config/

export default defineConfig({

base: deploymentBase,

css: {

postcss: {

plugins: [tailwind(), autoprefixer()],

},

},

plugins: [

vue(),

vueJsx(),

vueDevTools(),

githubPagesSpaFallback(),

VitePWA({

registerType: 'autoUpdate',

includeAssets: ['icons/*.svg', 'robots.txt'],

manifest: {

name: 'BashNota',

short_name: 'BashNota',

description: 'Offline-first notebook with Jupyter integration',

theme_color: '#ffffff',

icons: [

{

src: 'icons/app-icon.svg',

sizes: 'any',

type: 'image/svg+xml',

purpose: 'any maskable',

},

],

},

workbox: {

maximumFileSizeToCacheInBytes: 10 * 1024 * 1024, // 10MB

cleanupOutdatedCaches: true,

skipWaiting: true,

clientsClaim: true,

// Fonts are part of the application shell, not an optional online

// enhancement. Include the self-hosted font files so typography stays

// identical when BashNota is launched offline.

globPatterns: ['**/*.{js,css,html,woff,woff2}'],

// Feature payloads are deliberately absent from the install-time

// precache. Cache them only after the user opens the editor/reader (or

// selects WebLLM), which preserves repeat/offline use without making a

// Home/Login/Public visit download several megabytes in the background.

globIgnores: [

'**/webllm-*.js',

'**/editor-*.js',

'**/d3-chart-*.js',

'**/katex-*.js',

'**/vue-flow-*.js',

'**/heavy-style-*.css',

'**/EditorAppShell-*.css',

'**/KaTeX_*.*',

],

// Vite can combine editor/package CSS into a hash-only `index-*.css`

// asset. Preserve only stylesheets referenced by the HTML shell in the

// install manifest; every lazy-route stylesheet is runtime cached.

manifestTransforms: [async (entries) => {

const shell = await readFile(join(process.cwd(), 'dist', 'index.html'), 'utf8')

const shellStyles = new Set(

[...shell.matchAll(/href=["']([^"']+\.css)["']/g)]

.map((match) => match[1])

.filter((href) => href.startsWith(deploymentBase))

.map((href) => href.slice(deploymentBase.length)),

)

return {

manifest: entries.filter((entry) => !entry.url.endsWith('.css') || shellStyles.has(entry.url)),

warnings: [],

}

}],

runtimeCaching: [{

urlPattern: isSameOriginDeferredAssetRequest,

handler: 'CacheFirst',

options: {

cacheName: 'bashnota-deferred-features',

cacheableResponse: { statuses: [200] },

expiration: { maxEntries: 160, maxAgeSeconds: 30 * 24 * 60 * 60 },

},

}],

},

}),

process.env.BUNDLE_ANALYZE === '1' && visualizer({

filename: 'reports/bundle-visualizer.html',

template: 'treemap',

gzipSize: true,

brotliSize: true,

open: false,

}),

],

server: {

proxy: {

'/jupyter': {

target: 'http://localhost:8888',

changeOrigin: true,

rewrite: (path) => path.replace(/^\/jupyter/, ''),

configure: (proxy) => {

proxy.on('error', (err) => {

console.log('proxy error', err)

})

proxy.on('proxyReq', (proxyReq, req) => {

if (req.headers.authorization) {

proxyReq.setHeader('Authorization', req.headers.authorization)

}

})

},

},

},

},

resolve: {

alias: {

'@': fileURLToPath(new URL('./src', import.meta.url)),

},

},

build: {

// Route chunks fetch their own dependencies once a route is selected. This

// prevents Vite from promoting every dependency of a lazy editor route to

// a document-level modulepreload, while preserving normal dynamic-import

// loading and PWA caching semantics.

modulePreload: false,

rollupOptions: {

output: {

// Keep dependency preloads with their lazy import boundary. The default

// transitive hoisting turns the editor's manual chunks into entry-module

// imports, which defeats route-level loading even when the component

// itself is a dynamic import.

hoistTransitiveImports: false,

chunkFileNames(chunk) {

const moduleIds = chunk.moduleIds.join('\n')

if (moduleIds.includes('/node_modules/@vue-flow/')) return 'assets/vue-flow-[hash].js'

if (moduleIds.includes('/node_modules/katex/')) return 'assets/katex-[hash].js'

if (/\/node_modules\/(?:d3(?:-|\/)|chart\.js|vue-chartjs)/.test(moduleIds)) return 'assets/d3-chart-[hash].js'

if (/\/(?:src\/features\/editor|node_modules\/(?:@tiptap|prosemirror-|@codemirror|@lezer|highlight\.js|lowlight|tippy\.js))\//.test(moduleIds)) {

return 'assets/editor-[hash].js'

}

return 'assets/[name]-[hash].js'

},

// Keep WebLLM's opt-in runtime independently named. Other editor

// dependencies rely on Vite's route-aware automatic splitting: this

// Vite/Rollup version hoists the transitive dependencies of manually

// named groups into the app entry.

manualChunks(id) {

if (id.includes('/node_modules/@mlc-ai/')) return 'webllm'

},

},

},

},

})