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worker.ts
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worker.ts
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import path from 'node:path'
import MagicString from 'magic-string'
import type { EmittedAsset, OutputChunk } from 'rollup'
import type { ResolvedConfig } from '../config'
import type { Plugin } from '../plugin'
import type { ViteDevServer } from '../server'
import { ENV_ENTRY, ENV_PUBLIC_PATH } from '../constants'
import { cleanUrl, getHash, injectQuery, parseRequest } from '../utils'
import {
createToImportMetaURLBasedRelativeRuntime,
onRollupWarning,
toOutputFilePathInJS,
} from '../build'
import { getDepsOptimizer } from '../optimizer'
import { fileToUrl } from './asset'
interface WorkerCache {
// save worker all emit chunk avoid rollup make the same asset unique.
assets: Map<string, EmittedAsset>
// worker bundle don't deps on any more worker runtime info an id only had a result.
// save worker bundled file id to avoid repeated execution of bundles
// <input_filename, fileName>
bundle: Map<string, string>
// <hash, fileName>
fileNameHash: Map<string, string>
}
export type WorkerType = 'classic' | 'module' | 'ignore'
export const WORKER_FILE_ID = 'worker_file'
const workerCache = new WeakMap<ResolvedConfig, WorkerCache>()
export function isWorkerRequest(id: string): boolean {
const query = parseRequest(id)
if (query && query[WORKER_FILE_ID] != null) {
return true
}
return false
}
function saveEmitWorkerAsset(
config: ResolvedConfig,
asset: EmittedAsset,
): void {
const fileName = asset.fileName!
const workerMap = workerCache.get(config.mainConfig || config)!
workerMap.assets.set(fileName, asset)
}
// Ensure that only one rollup build is called at the same time to avoid
// leaking state in plugins between worker builds.
// TODO: Review if we can parallelize the bundling of workers.
const workerConfigSemaphore = new WeakMap<
ResolvedConfig,
Promise<OutputChunk>
>()
export async function bundleWorkerEntry(
config: ResolvedConfig,
id: string,
query: Record<string, string> | null,
): Promise<OutputChunk> {
const processing = workerConfigSemaphore.get(config)
if (processing) {
await processing
return bundleWorkerEntry(config, id, query)
}
const promise = serialBundleWorkerEntry(config, id, query)
workerConfigSemaphore.set(config, promise)
promise.then(() => workerConfigSemaphore.delete(config))
return promise
}
async function serialBundleWorkerEntry(
config: ResolvedConfig,
id: string,
query: Record<string, string> | null,
): Promise<OutputChunk> {
// bundle the file as entry to support imports
const { rollup } = await import('rollup')
const { plugins, rollupOptions, format } = config.worker
const bundle = await rollup({
...rollupOptions,
input: cleanUrl(id),
plugins,
onwarn(warning, warn) {
onRollupWarning(warning, warn, config)
},
preserveEntrySignatures: false,
})
let chunk: OutputChunk
try {
const workerOutputConfig = config.worker.rollupOptions.output
const workerConfig = workerOutputConfig
? Array.isArray(workerOutputConfig)
? workerOutputConfig[0] || {}
: workerOutputConfig
: {}
const {
output: [outputChunk, ...outputChunks],
} = await bundle.generate({
entryFileNames: path.posix.join(
config.build.assetsDir,
'[name]-[hash].js',
),
chunkFileNames: path.posix.join(
config.build.assetsDir,
'[name]-[hash].js',
),
assetFileNames: path.posix.join(
config.build.assetsDir,
'[name]-[hash].[ext]',
),
...workerConfig,
format,
sourcemap: config.build.sourcemap,
})
chunk = outputChunk
outputChunks.forEach((outputChunk) => {
if (outputChunk.type === 'asset') {
saveEmitWorkerAsset(config, outputChunk)
} else if (outputChunk.type === 'chunk') {
saveEmitWorkerAsset(config, {
fileName: outputChunk.fileName,
source: outputChunk.code,
type: 'asset',
})
}
})
} finally {
await bundle.close()
}
return emitSourcemapForWorkerEntry(config, query, chunk)
}
function emitSourcemapForWorkerEntry(
config: ResolvedConfig,
query: Record<string, string> | null,
chunk: OutputChunk,
): OutputChunk {
const { map: sourcemap } = chunk
if (sourcemap) {
if (config.build.sourcemap === 'inline') {
// Manually add the sourcemap to the code if configured for inline sourcemaps.
// TODO: Remove when https://github.com/rollup/rollup/issues/3913 is resolved
// Currently seems that it won't be resolved until Rollup 3
const dataUrl = sourcemap.toUrl()
chunk.code += `//# sourceMappingURL=${dataUrl}`
} else if (
config.build.sourcemap === 'hidden' ||
config.build.sourcemap === true
) {
const data = sourcemap.toString()
const mapFileName = chunk.fileName + '.map'
saveEmitWorkerAsset(config, {
fileName: mapFileName,
type: 'asset',
source: data,
})
// Emit the comment that tells the JS debugger where it can find the
// sourcemap file.
// 'hidden' causes the sourcemap file to be created but
// the comment in the file to be omitted.
if (config.build.sourcemap === true) {
// inline web workers need to use the full sourcemap path
// non-inline web workers can use a relative path
const sourceMapUrl =
query?.inline != null
? mapFileName
: path.relative(config.build.assetsDir, mapFileName)
chunk.code += `//# sourceMappingURL=${sourceMapUrl}`
}
}
}
return chunk
}
export const workerAssetUrlRE = /__VITE_WORKER_ASSET__([a-z\d]{8})__/g
function encodeWorkerAssetFileName(
fileName: string,
workerCache: WorkerCache,
): string {
const { fileNameHash } = workerCache
const hash = getHash(fileName)
if (!fileNameHash.get(hash)) {
fileNameHash.set(hash, fileName)
}
return `__VITE_WORKER_ASSET__${hash}__`
}
export async function workerFileToUrl(
config: ResolvedConfig,
id: string,
query: Record<string, string> | null,
): Promise<string> {
const workerMap = workerCache.get(config.mainConfig || config)!
let fileName = workerMap.bundle.get(id)
if (!fileName) {
const outputChunk = await bundleWorkerEntry(config, id, query)
fileName = outputChunk.fileName
saveEmitWorkerAsset(config, {
fileName,
source: outputChunk.code,
type: 'asset',
})
workerMap.bundle.set(id, fileName)
}
return encodeWorkerAssetFileName(fileName, workerMap)
}
export function webWorkerPlugin(config: ResolvedConfig): Plugin {
const isBuild = config.command === 'build'
let server: ViteDevServer
const isWorker = config.isWorker
return {
name: 'vite:worker',
configureServer(_server) {
server = _server
},
buildStart() {
if (isWorker) {
return
}
workerCache.set(config, {
assets: new Map(),
bundle: new Map(),
fileNameHash: new Map(),
})
},
load(id) {
if (isBuild) {
const parsedQuery = parseRequest(id)
if (
parsedQuery &&
(parsedQuery.worker ?? parsedQuery.sharedworker) != null
) {
return ''
}
}
},
async transform(raw, id, options) {
const ssr = options?.ssr === true
const query = parseRequest(id)
if (query && query[WORKER_FILE_ID] != null) {
// if import worker by worker constructor will have query.type
// other type will be import worker by esm
const workerType = query['type']! as WorkerType
let injectEnv = ''
if (workerType === 'classic') {
injectEnv = `importScripts('${ENV_PUBLIC_PATH}')\n`
} else if (workerType === 'module') {
injectEnv = `import '${ENV_PUBLIC_PATH}'\n`
} else if (workerType === 'ignore') {
if (isBuild) {
injectEnv = ''
} else if (server) {
// dynamic worker type we can't know how import the env
// so we copy /@vite/env code of server transform result into file header
const { moduleGraph } = server
const module = moduleGraph.getModuleById(ENV_ENTRY)
injectEnv = module?.transformResult?.code || ''
}
}
return {
code: injectEnv + raw,
}
}
if (
query == null ||
(query && (query.worker ?? query.sharedworker) == null)
) {
return
}
// stringified url or `new URL(...)`
let url: string
const { format } = config.worker
const workerConstructor =
query.sharedworker != null ? 'SharedWorker' : 'Worker'
const workerType = isBuild
? format === 'es'
? 'module'
: 'classic'
: 'module'
const workerOptions = workerType === 'classic' ? '' : ',{type: "module"}'
if (isBuild) {
getDepsOptimizer(config, ssr)?.registerWorkersSource(id)
if (query.inline != null) {
const chunk = await bundleWorkerEntry(config, id, query)
// inline as blob data url
return {
code: `const encodedJs = "${Buffer.from(chunk.code).toString(
'base64',
)}";
const blob = typeof window !== "undefined" && window.Blob && new Blob([atob(encodedJs)], { type: "text/javascript;charset=utf-8" });
export default function WorkerWrapper() {
const objURL = blob && (window.URL || window.webkitURL).createObjectURL(blob);
try {
return objURL ? new ${workerConstructor}(objURL) : new ${workerConstructor}("data:application/javascript;base64," + encodedJs${workerOptions});
} finally {
objURL && (window.URL || window.webkitURL).revokeObjectURL(objURL);
}
}`,
// Empty sourcemap to suppress Rollup warning
map: { mappings: '' },
}
} else {
url = await workerFileToUrl(config, id, query)
}
} else {
url = await fileToUrl(cleanUrl(id), config, this)
url = injectQuery(url, WORKER_FILE_ID)
url = injectQuery(url, `type=${workerType}`)
}
if (query.url != null) {
return {
code: `export default ${JSON.stringify(url)}`,
map: { mappings: '' }, // Empty sourcemap to suppress Rollup warning
}
}
return {
code: `export default function WorkerWrapper() {
return new ${workerConstructor}(${JSON.stringify(
url,
)}${workerOptions})
}`,
map: { mappings: '' }, // Empty sourcemap to suppress Rollup warning
}
},
renderChunk(code, chunk, outputOptions) {
let s: MagicString
const result = () => {
return (
s && {
code: s.toString(),
map: config.build.sourcemap ? s.generateMap({ hires: true }) : null,
}
)
}
if (code.match(workerAssetUrlRE) || code.includes('import.meta.url')) {
const toRelativeRuntime = createToImportMetaURLBasedRelativeRuntime(
outputOptions.format,
)
let match: RegExpExecArray | null
s = new MagicString(code)
workerAssetUrlRE.lastIndex = 0
// Replace "__VITE_WORKER_ASSET__5aa0ddc0__" using relative paths
const workerMap = workerCache.get(config.mainConfig || config)!
const { fileNameHash } = workerMap
while ((match = workerAssetUrlRE.exec(code))) {
const [full, hash] = match
const filename = fileNameHash.get(hash)!
const replacement = toOutputFilePathInJS(
filename,
'asset',
chunk.fileName,
'js',
config,
toRelativeRuntime,
)
const replacementString =
typeof replacement === 'string'
? JSON.stringify(replacement).slice(1, -1)
: `"+${replacement.runtime}+"`
s.update(match.index, match.index + full.length, replacementString)
}
}
return result()
},
generateBundle(opts) {
// @ts-ignore asset emits are skipped in legacy bundle
if (opts.__vite_skip_asset_emit__ || isWorker) {
return
}
const workerMap = workerCache.get(config)!
workerMap.assets.forEach((asset) => {
this.emitFile(asset)
workerMap.assets.delete(asset.fileName!)
})
},
}
}