/
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, urlRE } from '../utils'
import {
createToImportMetaURLBasedRelativeRuntime,
onRollupWarning,
toOutputFilePathInJS,
} from '../build'
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 workerOrSharedWorkerRE = /(?:\?|&)(worker|sharedworker)(?:&|$)/
const workerFileRE = /(?:\?|&)worker_file&type=(\w+)(?:&|$)/
const inlineRE = /[?&]inline\b/
export const WORKER_FILE_ID = 'worker_file'
const workerCache = new WeakMap<ResolvedConfig, WorkerCache>()
function saveEmitWorkerAsset(
config: ResolvedConfig,
asset: EmittedAsset,
): void {
const fileName = asset.fileName!
const workerMap = workerCache.get(config.mainConfig || config)!
workerMap.assets.set(fileName, asset)
}
async function bundleWorkerEntry(
config: ResolvedConfig,
id: string,
): 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: await 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, chunk)
}
function emitSourcemapForWorkerEntry(
config: ResolvedConfig,
chunk: OutputChunk,
): OutputChunk {
const { map: sourcemap } = chunk
if (sourcemap) {
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,
})
}
}
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,
): Promise<string> {
const workerMap = workerCache.get(config.mainConfig || config)!
let fileName = workerMap.bundle.get(id)
if (!fileName) {
const outputChunk = await bundleWorkerEntry(config, id)
fileName = outputChunk.fileName
saveEmitWorkerAsset(config, {
fileName,
source: outputChunk.code,
type: 'asset',
})
workerMap.bundle.set(id, fileName)
}
return encodeWorkerAssetFileName(fileName, workerMap)
}
export function webWorkerPostPlugin(): Plugin {
return {
name: 'vite:worker-post',
resolveImportMeta(property, { format }) {
// document is undefined in the worker, so we need to avoid it in iife
if (format === 'iife') {
// compiling import.meta
if (!property) {
// rollup only supports `url` property. we only support `url` property as well.
// https://github.com/rollup/rollup/blob/62b648e1cc6a1f00260bb85aa2050097bb4afd2b/src/ast/nodes/MetaProperty.ts#L164-L173
return `{
url: self.location.href
}`
}
// compiling import.meta.url
if (property === 'url') {
return 'self.location.href'
}
}
return null
},
}
}
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 && workerOrSharedWorkerRE.test(id)) {
return ''
}
},
shouldTransformCachedModule({ id }) {
if (isBuild && config.build.watch && workerOrSharedWorkerRE.test(id)) {
return true
}
},
async transform(raw, id) {
const workerFileMatch = workerFileRE.exec(id)
if (workerFileMatch) {
// if import worker by worker constructor will have query.type
// other type will be import worker by esm
const workerType = workerFileMatch[1] as WorkerType
let injectEnv = ''
const scriptPath = JSON.stringify(
path.posix.join(config.base, ENV_PUBLIC_PATH),
)
if (workerType === 'classic') {
injectEnv = `importScripts(${scriptPath})\n`
} else if (workerType === 'module') {
injectEnv = `import ${scriptPath}\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 || ''
}
}
if (injectEnv) {
const s = new MagicString(raw)
s.prepend(injectEnv)
return {
code: s.toString(),
map: s.generateMap({ hires: 'boundary' }),
}
}
return
}
const workerMatch = workerOrSharedWorkerRE.exec(id)
if (!workerMatch) return
// stringified url or `new URL(...)`
let url: string
const { format } = config.worker
const workerConstructor =
workerMatch[1] === 'sharedworker' ? 'SharedWorker' : 'Worker'
const workerType = isBuild
? format === 'es'
? 'module'
: 'classic'
: 'module'
const workerTypeOption = `{
${workerType === 'module' ? `type: "module",` : ''}
name: options?.name
}`
if (isBuild) {
if (inlineRE.test(id)) {
const chunk = await bundleWorkerEntry(config, id)
const encodedJs = `const encodedJs = "${Buffer.from(
chunk.code,
).toString('base64')}";`
const code =
// Using blob URL for SharedWorker results in multiple instances of a same worker
workerConstructor === 'Worker'
? `${encodedJs}
const blob = typeof window !== "undefined" && window.Blob && new Blob([${
workerType === 'classic'
? ''
: // `URL` is always available, in `Worker[type="module"]`
`'URL.revokeObjectURL(import.meta.url);'+`
}atob(encodedJs)], { type: "text/javascript;charset=utf-8" });
export default function WorkerWrapper(options) {
let objURL;
try {
objURL = blob && (window.URL || window.webkitURL).createObjectURL(blob);
if (!objURL) throw ''
const worker = new ${workerConstructor}(objURL, ${workerTypeOption});
worker.addEventListener("error", () => {
(window.URL || window.webkitURL).revokeObjectURL(objURL);
});
return worker;
} catch(e) {
return new ${workerConstructor}(
"data:text/javascript;base64," + encodedJs,
${workerTypeOption}
);
}${
// For module workers, we should not revoke the URL until the worker runs,
// otherwise the worker fails to run
workerType === 'classic'
? ` finally {
objURL && (window.URL || window.webkitURL).revokeObjectURL(objURL);
}`
: ''
}
}`
: `${encodedJs}
export default function WorkerWrapper(options) {
return new ${workerConstructor}(
"data:text/javascript;base64," + encodedJs,
${workerTypeOption}
);
}
`
return {
code,
// Empty sourcemap to suppress Rollup warning
map: { mappings: '' },
}
} else {
url = await workerFileToUrl(config, id)
}
} else {
url = await fileToUrl(cleanUrl(id), config, this)
url = injectQuery(url, `${WORKER_FILE_ID}&type=${workerType}`)
}
if (urlRE.test(id)) {
return {
code: `export default ${JSON.stringify(url)}`,
map: { mappings: '' }, // Empty sourcemap to suppress Rollup warning
}
}
return {
code: `export default function WorkerWrapper(options) {
return new ${workerConstructor}(
${JSON.stringify(url)},
${workerTypeOption}
);
}`,
map: { mappings: '' }, // Empty sourcemap to suppress Rollup warning
}
},
renderChunk(code, chunk, outputOptions) {
let s: MagicString
const result = () => {
return (
s && {
code: s.toString(),
map: config.build.sourcemap
? s.generateMap({ hires: 'boundary' })
: null,
}
)
}
workerAssetUrlRE.lastIndex = 0
if (workerAssetUrlRE.test(code)) {
const toRelativeRuntime = createToImportMetaURLBasedRelativeRuntime(
outputOptions.format,
config.isWorker,
)
let match: RegExpExecArray | null
s = new MagicString(code)
workerAssetUrlRE.lastIndex = 0
// Replace "__VITE_WORKER_ASSET__5aa0ddc0__" using relative paths
const workerMap = workerCache.get(config.mainConfig || config)!
const { fileNameHash } = workerMap
while ((match = workerAssetUrlRE.exec(code))) {
const [full, hash] = match
const filename = fileNameHash.get(hash)!
const replacement = toOutputFilePathInJS(
filename,
'asset',
chunk.fileName,
'js',
config,
toRelativeRuntime,
)
const replacementString =
typeof replacement === 'string'
? JSON.stringify(replacement).slice(1, -1)
: `"+${replacement.runtime}+"`
s.update(match.index, match.index + full.length, replacementString)
}
}
return result()
},
generateBundle(opts) {
// @ts-expect-error 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!)
})
},
}
}