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splitVendorChunk.ts
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splitVendorChunk.ts
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import type {
GetManualChunk,
GetModuleInfo,
ManualChunkMeta,
OutputOptions
} from 'rollup'
import type { UserConfig } from '../../node'
import type { Plugin } from '../plugin'
// This file will be built for both ESM and CJS. Avoid relying on other modules as possible.
const cssLangs = `\\.(css|less|sass|scss|styl|stylus|pcss|postcss)($|\\?)`
const cssLangRE = new RegExp(cssLangs)
export const isCSSRequest = (request: string): boolean =>
cssLangRE.test(request)
// Use splitVendorChunkPlugin() to get the same manualChunks strategy as Vite 2.7
// We don't recommend using this strategy as a general solution moving forward
// splitVendorChunk is a simple index/vendor strategy that was used in Vite
// until v2.8. It is exposed to let people continue to use it in case it was
// working well for their setups.
// The cache needs to be reset on buildStart for watch mode to work correctly
// Don't use this manualChunks strategy for ssr, lib mode, and 'umd' or 'iife'
export class SplitVendorChunkCache {
cache: Map<string, boolean>
constructor() {
this.cache = new Map<string, boolean>()
}
reset(): void {
this.cache = new Map<string, boolean>()
}
}
export function splitVendorChunk(
options: { cache?: SplitVendorChunkCache } = {}
): GetManualChunk {
const cache = options.cache ?? new SplitVendorChunkCache()
return (id, { getModuleInfo }) => {
if (
id.includes('node_modules') &&
!isCSSRequest(id) &&
staticImportedByEntry(id, getModuleInfo, cache.cache)
) {
return 'vendor'
}
}
}
function staticImportedByEntry(
id: string,
getModuleInfo: GetModuleInfo,
cache: Map<string, boolean>,
importStack: string[] = []
): boolean {
if (cache.has(id)) {
return cache.get(id) as boolean
}
if (importStack.includes(id)) {
// circular deps!
cache.set(id, false)
return false
}
const mod = getModuleInfo(id)
if (!mod) {
cache.set(id, false)
return false
}
if (mod.isEntry) {
cache.set(id, true)
return true
}
const someImporterIs = mod.importers.some((importer) =>
staticImportedByEntry(
importer,
getModuleInfo,
cache,
importStack.concat(id)
)
)
cache.set(id, someImporterIs)
return someImporterIs
}
export function splitVendorChunkPlugin(): Plugin {
const caches: SplitVendorChunkCache[] = []
function createSplitVendorChunk(output: OutputOptions, config: UserConfig) {
const cache = new SplitVendorChunkCache()
caches.push(cache)
const build = config.build ?? {}
const format = output?.format
if (!build.ssr && !build.lib && format !== 'umd' && format !== 'iife') {
return splitVendorChunk({ cache })
}
}
return {
name: 'vite:split-vendor-chunk',
config(config) {
let outputs = config?.build?.rollupOptions?.output
if (outputs) {
outputs = Array.isArray(outputs) ? outputs : [outputs]
for (const output of outputs) {
const viteManualChunks = createSplitVendorChunk(output, config)
if (viteManualChunks) {
if (output.manualChunks) {
if (typeof output.manualChunks === 'function') {
const userManualChunks = output.manualChunks
output.manualChunks = (id: string, api: ManualChunkMeta) => {
return userManualChunks(id, api) ?? viteManualChunks(id, api)
}
}
// else, leave the object form of manualChunks untouched, as
// we can't safely replicate rollup handling.
} else {
output.manualChunks = viteManualChunks
}
}
}
} else {
return {
build: {
rollupOptions: {
output: {
manualChunks: createSplitVendorChunk({}, config)
}
}
}
}
}
},
buildStart() {
caches.forEach((cache) => cache.reset())
}
}
}