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refactor: avoid splitting vendor chunk by default (#6534)
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Original file line number | Diff line number | Diff line change |
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import type { UserConfig } from '../../node' | ||
import type { Plugin } from '../plugin' | ||
import type { | ||
OutputOptions, | ||
GetManualChunk, | ||
GetManualChunkApi, | ||
GetModuleInfo | ||
} from 'rollup' | ||
import { isCSSRequest } from './css' | ||
|
||
// 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() { | ||
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: GetManualChunkApi) => { | ||
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()) | ||
} | ||
} | ||
} |