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css.ts
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css.ts
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import fs from 'node:fs'
import path from 'node:path'
import { createRequire } from 'node:module'
import glob from 'fast-glob'
import postcssrc from 'postcss-load-config'
import type {
ExistingRawSourceMap,
NormalizedOutputOptions,
OutputChunk,
RenderedChunk,
RollupError,
SourceMapInput
} from 'rollup'
import { dataToEsm } from '@rollup/pluginutils'
import colors from 'picocolors'
import MagicString from 'magic-string'
import type * as PostCSS from 'postcss'
import type Sass from 'sass'
import type Stylus from 'stylus'
import type Less from 'less'
import type { Alias } from 'types/alias'
import type { TransformOptions } from 'esbuild'
import { formatMessages, transform } from 'esbuild'
import type { RawSourceMap } from '@ampproject/remapping'
import { getCodeWithSourcemap, injectSourcesContent } from '../server/sourcemap'
import type { ModuleNode } from '../server/moduleGraph'
import type { ResolveFn, ViteDevServer } from '../'
import { toOutputFilePathInCss } from '../build'
import { CLIENT_PUBLIC_PATH, SPECIAL_QUERY_RE } from '../constants'
import type { ResolvedConfig } from '../config'
import type { Plugin } from '../plugin'
import {
asyncReplace,
cleanUrl,
combineSourcemaps,
emptyCssComments,
generateCodeFrame,
getHash,
isDataUrl,
isExternalUrl,
isObject,
normalizePath,
parseRequest,
processSrcSet,
requireResolveFromRootWithFallback
} from '../utils'
import type { Logger } from '../logger'
import { addToHTMLProxyTransformResult } from './html'
import {
assetFileNamesToFileName,
assetUrlRE,
checkPublicFile,
fileToUrl,
getAssetFilename,
publicAssetUrlCache,
publicAssetUrlRE,
publicFileToBuiltUrl,
resolveAssetFileNames
} from './asset'
import type { ESBuildOptions } from './esbuild'
// const debug = createDebugger('vite:css')
export interface CSSOptions {
/**
* https://github.com/css-modules/postcss-modules
*/
modules?: CSSModulesOptions | false
preprocessorOptions?: Record<string, any>
postcss?:
| string
| (PostCSS.ProcessOptions & {
plugins?: PostCSS.AcceptedPlugin[]
})
/**
* Enables css sourcemaps during dev
* @default false
* @experimental
*/
devSourcemap?: boolean
}
export interface CSSModulesOptions {
getJSON?: (
cssFileName: string,
json: Record<string, string>,
outputFileName: string
) => void
scopeBehaviour?: 'global' | 'local'
globalModulePaths?: RegExp[]
generateScopedName?:
| string
| ((name: string, filename: string, css: string) => string)
hashPrefix?: string
/**
* default: null
*/
localsConvention?:
| 'camelCase'
| 'camelCaseOnly'
| 'dashes'
| 'dashesOnly'
| null
}
const cssLangs = `\\.(css|less|sass|scss|styl|stylus|pcss|postcss)($|\\?)`
const cssLangRE = new RegExp(cssLangs)
const cssModuleRE = new RegExp(`\\.module${cssLangs}`)
const directRequestRE = /(\?|&)direct\b/
const htmlProxyRE = /(\?|&)html-proxy\b/
const commonjsProxyRE = /\?commonjs-proxy/
const inlineRE = /(\?|&)inline\b/
const inlineCSSRE = /(\?|&)inline-css\b/
const usedRE = /(\?|&)used\b/
const varRE = /^var\(/i
const cssBundleName = 'style.css'
const enum PreprocessLang {
less = 'less',
sass = 'sass',
scss = 'scss',
styl = 'styl',
stylus = 'stylus'
}
const enum PureCssLang {
css = 'css'
}
type CssLang = keyof typeof PureCssLang | keyof typeof PreprocessLang
export const isCSSRequest = (request: string): boolean =>
cssLangRE.test(request)
export const isDirectCSSRequest = (request: string): boolean =>
cssLangRE.test(request) && directRequestRE.test(request)
export const isDirectRequest = (request: string): boolean =>
directRequestRE.test(request)
const cssModulesCache = new WeakMap<
ResolvedConfig,
Map<string, Record<string, string>>
>()
export const removedPureCssFilesCache = new WeakMap<
ResolvedConfig,
Map<string, RenderedChunk>
>()
export const cssEntryFilesCache = new WeakMap<ResolvedConfig, Set<string>>()
const postcssConfigCache = new WeakMap<
ResolvedConfig,
PostCSSConfigResult | null
>()
function encodePublicUrlsInCSS(config: ResolvedConfig) {
return config.command === 'build'
}
/**
* Plugin applied before user plugins
*/
export function cssPlugin(config: ResolvedConfig): Plugin {
let server: ViteDevServer
let moduleCache: Map<string, Record<string, string>>
const resolveUrl = config.createResolver({
preferRelative: true,
tryIndex: false,
extensions: []
})
const atImportResolvers = createCSSResolvers(config)
return {
name: 'vite:css',
configureServer(_server) {
server = _server
},
buildStart() {
// Ensure a new cache for every build (i.e. rebuilding in watch mode)
moduleCache = new Map<string, Record<string, string>>()
cssModulesCache.set(config, moduleCache)
removedPureCssFilesCache.set(config, new Map<string, RenderedChunk>())
cssEntryFilesCache.set(config, new Set())
},
async transform(raw, id, options) {
if (
!isCSSRequest(id) ||
commonjsProxyRE.test(id) ||
SPECIAL_QUERY_RE.test(id)
) {
return
}
const ssr = options?.ssr === true
const urlReplacer: CssUrlReplacer = async (url, importer) => {
if (checkPublicFile(url, config)) {
if (encodePublicUrlsInCSS(config)) {
return publicFileToBuiltUrl(url, config)
} else {
return config.base + url.slice(1)
}
}
const resolved = await resolveUrl(url, importer)
if (resolved) {
return fileToUrl(resolved, config, this)
}
return url
}
const {
code: css,
modules,
deps,
map
} = await compileCSS(
id,
raw,
config,
urlReplacer,
atImportResolvers,
server
)
if (modules) {
moduleCache.set(id, modules)
}
// track deps for build watch mode
if (config.command === 'build' && config.build.watch && deps) {
for (const file of deps) {
this.addWatchFile(file)
}
}
// dev
if (server) {
// server only logic for handling CSS @import dependency hmr
const { moduleGraph } = server
const thisModule = moduleGraph.getModuleById(id)
const devBase = config.base
if (thisModule) {
// CSS modules cannot self-accept since it exports values
const isSelfAccepting =
!modules && !inlineRE.test(id) && !htmlProxyRE.test(id)
if (deps) {
// record deps in the module graph so edits to @import css can trigger
// main import to hot update
const depModules = new Set<string | ModuleNode>()
for (const file of deps) {
depModules.add(
isCSSRequest(file)
? moduleGraph.createFileOnlyEntry(file)
: await moduleGraph.ensureEntryFromUrl(
(
await fileToUrl(file, config, this)
).replace((config.server?.origin ?? '') + devBase, '/'),
ssr
)
)
}
moduleGraph.updateModuleInfo(
thisModule,
depModules,
null,
// The root CSS proxy module is self-accepting and should not
// have an explicit accept list
new Set(),
null,
isSelfAccepting,
ssr
)
for (const file of deps) {
this.addWatchFile(file)
}
} else {
thisModule.isSelfAccepting = isSelfAccepting
}
}
}
return {
code: css,
map
}
}
}
}
/**
* Plugin applied after user plugins
*/
export function cssPostPlugin(config: ResolvedConfig): Plugin {
// styles initialization in buildStart causes a styling loss in watch
const styles: Map<string, string> = new Map<string, string>()
let pureCssChunks: Set<string>
// when there are multiple rollup outputs and extracting CSS, only emit once,
// since output formats have no effect on the generated CSS.
let outputToExtractedCSSMap: Map<NormalizedOutputOptions, string>
let hasEmitted = false
const rollupOptionsOutput = config.build.rollupOptions.output
const assetFileNames = (
Array.isArray(rollupOptionsOutput)
? rollupOptionsOutput[0]
: rollupOptionsOutput
)?.assetFileNames
const getCssAssetDirname = (cssAssetName: string) => {
if (!assetFileNames) {
return config.build.assetsDir
} else if (typeof assetFileNames === 'string') {
return path.dirname(assetFileNames)
} else {
return path.dirname(
assetFileNames({
name: cssAssetName,
type: 'asset',
source: '/* vite internal call, ignore */'
})
)
}
}
return {
name: 'vite:css-post',
buildStart() {
// Ensure new caches for every build (i.e. rebuilding in watch mode)
pureCssChunks = new Set<string>()
outputToExtractedCSSMap = new Map<NormalizedOutputOptions, string>()
hasEmitted = false
},
async transform(css, id, options) {
if (
!isCSSRequest(id) ||
commonjsProxyRE.test(id) ||
SPECIAL_QUERY_RE.test(id)
) {
return
}
const inlined = inlineRE.test(id)
const modules = cssModulesCache.get(config)!.get(id)
// #6984, #7552
// `foo.module.css` => modulesCode
// `foo.module.css?inline` => cssContent
const modulesCode =
modules &&
!inlined &&
dataToEsm(modules, { namedExports: true, preferConst: true })
if (config.command === 'serve') {
const getContentWithSourcemap = async (content: string) => {
if (config.css?.devSourcemap) {
const sourcemap = this.getCombinedSourcemap()
await injectSourcesContent(sourcemap, cleanUrl(id), config.logger)
return getCodeWithSourcemap('css', content, sourcemap)
}
return content
}
if (isDirectCSSRequest(id)) {
return await getContentWithSourcemap(css)
}
// server only
if (options?.ssr) {
return modulesCode || `export default ${JSON.stringify(css)}`
}
if (inlined) {
return `export default ${JSON.stringify(css)}`
}
const cssContent = await getContentWithSourcemap(css)
const devBase = config.base
return [
`import { updateStyle as __vite__updateStyle, removeStyle as __vite__removeStyle } from ${JSON.stringify(
path.posix.join(devBase, CLIENT_PUBLIC_PATH)
)}`,
`const __vite__id = ${JSON.stringify(id)}`,
`const __vite__css = ${JSON.stringify(cssContent)}`,
`__vite__updateStyle(__vite__id, __vite__css)`,
// css modules exports change on edit so it can't self accept
`${
modulesCode ||
`import.meta.hot.accept()\nexport default __vite__css`
}`,
`import.meta.hot.prune(() => __vite__removeStyle(__vite__id))`
].join('\n')
}
// build CSS handling ----------------------------------------------------
// record css
// cache css compile result to map
// and then use the cache replace inline-style-flag when `generateBundle` in vite:build-html plugin
const inlineCSS = inlineCSSRE.test(id)
const isHTMLProxy = htmlProxyRE.test(id)
const query = parseRequest(id)
if (inlineCSS && isHTMLProxy) {
addToHTMLProxyTransformResult(
`${getHash(cleanUrl(id))}_${Number.parseInt(query!.index)}`,
css
)
return `export default ''`
}
if (!inlined) {
styles.set(id, css)
}
let code: string
if (usedRE.test(id)) {
if (modulesCode) {
code = modulesCode
} else {
let content = css
if (config.build.minify) {
content = await minifyCSS(content, config)
}
code = `export default ${JSON.stringify(content)}`
}
} else {
code = `export default ''`
}
return {
code,
map: { mappings: '' },
// avoid the css module from being tree-shaken so that we can retrieve
// it in renderChunk()
moduleSideEffects: inlined ? false : 'no-treeshake'
}
},
async renderChunk(code, chunk, opts) {
let chunkCSS = ''
let isPureCssChunk = true
const ids = Object.keys(chunk.modules)
for (const id of ids) {
if (
!isCSSRequest(id) ||
cssModuleRE.test(id) ||
commonjsProxyRE.test(id)
) {
isPureCssChunk = false
}
if (styles.has(id)) {
chunkCSS += styles.get(id)
}
}
if (!chunkCSS) {
return null
}
const cssEntryFiles = cssEntryFilesCache.get(config)!
const publicAssetUrlMap = publicAssetUrlCache.get(config)!
// resolve asset URL placeholders to their built file URLs
function resolveAssetUrlsInCss(chunkCSS: string, cssAssetName: string) {
const encodedPublicUrls = encodePublicUrlsInCSS(config)
const relative = config.base === './' || config.base === ''
const cssAssetDirname =
encodedPublicUrls || relative
? getCssAssetDirname(cssAssetName)
: undefined
const toRelative = (filename: string, importer: string) => {
// relative base + extracted CSS
const relativePath = path.posix.relative(cssAssetDirname!, filename)
return relativePath.startsWith('.')
? relativePath
: './' + relativePath
}
// replace asset url references with resolved url.
chunkCSS = chunkCSS.replace(assetUrlRE, (_, fileHash, postfix = '') => {
const filename = getAssetFilename(fileHash, config) + postfix
chunk.viteMetadata.importedAssets.add(cleanUrl(filename))
return toOutputFilePathInCss(
filename,
'asset',
cssAssetName,
'css',
config,
toRelative
)
})
// resolve public URL from CSS paths
if (encodedPublicUrls) {
const relativePathToPublicFromCSS = path.posix.relative(
cssAssetDirname!,
''
)
chunkCSS = chunkCSS.replace(publicAssetUrlRE, (_, hash) => {
const publicUrl = publicAssetUrlMap.get(hash)!.slice(1)
return toOutputFilePathInCss(
publicUrl,
'public',
cssAssetName,
'css',
config,
() => `${relativePathToPublicFromCSS}/${publicUrl}`
)
})
}
return chunkCSS
}
function ensureFileExt(name: string, ext: string) {
return path.format({ ...path.parse(name), base: undefined, ext })
}
if (config.build.cssCodeSplit) {
if (isPureCssChunk) {
// this is a shared CSS-only chunk that is empty.
pureCssChunks.add(chunk.fileName)
}
if (opts.format === 'es' || opts.format === 'cjs') {
const cssAssetName = chunk.facadeModuleId
? normalizePath(path.relative(config.root, chunk.facadeModuleId))
: chunk.name
const lang = path.extname(cssAssetName).slice(1)
const cssFileName = ensureFileExt(cssAssetName, '.css')
if (chunk.isEntry && isPureCssChunk) cssEntryFiles.add(cssAssetName)
chunkCSS = resolveAssetUrlsInCss(chunkCSS, cssAssetName)
chunkCSS = await finalizeCss(chunkCSS, true, config)
// emit corresponding css file
const fileHandle = this.emitFile({
name: isPreProcessor(lang) ? cssAssetName : cssFileName,
fileName: assetFileNamesToFileName(
resolveAssetFileNames(config),
cssFileName,
getHash(chunkCSS),
chunkCSS
),
type: 'asset',
source: chunkCSS
})
chunk.viteMetadata.importedCss.add(this.getFileName(fileHandle))
} else if (!config.build.ssr) {
// legacy build and inline css
// __VITE_ASSET__ and __VITE_PUBLIC_ASSET__ urls are processed by
// the vite:asset plugin, don't call resolveAssetUrlsInCss here
chunkCSS = await finalizeCss(chunkCSS, true, config)
const style = `__vite_style__`
const injectCode =
`var ${style} = document.createElement('style');` +
`${style}.innerHTML = ${JSON.stringify(chunkCSS)};` +
`document.head.appendChild(${style});`
if (config.build.sourcemap) {
const s = new MagicString(code)
s.prepend(injectCode)
// resolve public URL from CSS paths, we need to use absolute paths
return {
code: s.toString(),
map: s.generateMap({ hires: true })
}
} else {
return { code: injectCode + code }
}
}
} else {
chunkCSS = resolveAssetUrlsInCss(chunkCSS, cssBundleName)
// finalizeCss is called for the aggregated chunk in generateBundle
outputToExtractedCSSMap.set(
opts,
(outputToExtractedCSSMap.get(opts) || '') + chunkCSS
)
}
return null
},
async generateBundle(opts, bundle) {
// @ts-ignore asset emits are skipped in legacy bundle
if (opts.__vite_skip_asset_emit__) {
return
}
// remove empty css chunks and their imports
if (pureCssChunks.size) {
const emptyChunkFiles = [...pureCssChunks]
.map((file) => path.basename(file))
.join('|')
.replace(/\./g, '\\.')
const emptyChunkRE = new RegExp(
opts.format === 'es'
? `\\bimport\\s*["'][^"']*(?:${emptyChunkFiles})["'];\n?`
: `\\brequire\\(\\s*["'][^"']*(?:${emptyChunkFiles})["']\\);\n?`,
'g'
)
for (const file in bundle) {
const chunk = bundle[file]
if (chunk.type === 'chunk') {
// remove pure css chunk from other chunk's imports,
// and also register the emitted CSS files under the importer
// chunks instead.
chunk.imports = chunk.imports.filter((file) => {
if (pureCssChunks.has(file)) {
const {
viteMetadata: { importedCss }
} = bundle[file] as OutputChunk
importedCss.forEach((file) =>
chunk.viteMetadata.importedCss.add(file)
)
return false
}
return true
})
chunk.code = chunk.code.replace(
emptyChunkRE,
// remove css import while preserving source map location
(m) => `/* empty css ${''.padEnd(m.length - 15)}*/`
)
}
}
const removedPureCssFiles = removedPureCssFilesCache.get(config)!
pureCssChunks.forEach((fileName) => {
removedPureCssFiles.set(fileName, bundle[fileName] as RenderedChunk)
delete bundle[fileName]
})
}
let extractedCss = outputToExtractedCSSMap.get(opts)
if (extractedCss && !hasEmitted) {
hasEmitted = true
extractedCss = await finalizeCss(extractedCss, true, config)
this.emitFile({
name: cssBundleName,
type: 'asset',
source: extractedCss
})
}
}
}
}
interface CSSAtImportResolvers {
css: ResolveFn
sass: ResolveFn
less: ResolveFn
}
function createCSSResolvers(config: ResolvedConfig): CSSAtImportResolvers {
let cssResolve: ResolveFn | undefined
let sassResolve: ResolveFn | undefined
let lessResolve: ResolveFn | undefined
return {
get css() {
return (
cssResolve ||
(cssResolve = config.createResolver({
extensions: ['.css'],
mainFields: ['style'],
tryIndex: false,
preferRelative: true
}))
)
},
get sass() {
return (
sassResolve ||
(sassResolve = config.createResolver({
extensions: ['.scss', '.sass', '.css'],
mainFields: ['sass', 'style'],
tryIndex: true,
tryPrefix: '_',
preferRelative: true
}))
)
},
get less() {
return (
lessResolve ||
(lessResolve = config.createResolver({
extensions: ['.less', '.css'],
mainFields: ['less', 'style'],
tryIndex: false,
preferRelative: true
}))
)
}
}
}
function getCssResolversKeys(
resolvers: CSSAtImportResolvers
): Array<keyof CSSAtImportResolvers> {
return Object.keys(resolvers) as unknown as Array<keyof CSSAtImportResolvers>
}
async function compileCSS(
id: string,
code: string,
config: ResolvedConfig,
urlReplacer: CssUrlReplacer,
atImportResolvers: CSSAtImportResolvers,
server?: ViteDevServer
): Promise<{
code: string
map?: SourceMapInput
ast?: PostCSS.Result
modules?: Record<string, string>
deps?: Set<string>
}> {
const {
modules: modulesOptions,
preprocessorOptions,
devSourcemap
} = config.css || {}
const isModule = modulesOptions !== false && cssModuleRE.test(id)
// although at serve time it can work without processing, we do need to
// crawl them in order to register watch dependencies.
const needInlineImport = code.includes('@import')
const hasUrl = cssUrlRE.test(code) || cssImageSetRE.test(code)
const postcssConfig = await resolvePostcssConfig(config)
const lang = id.match(cssLangRE)?.[1] as CssLang | undefined
// 1. plain css that needs no processing
if (
lang === 'css' &&
!postcssConfig &&
!isModule &&
!needInlineImport &&
!hasUrl
) {
return { code, map: null }
}
let preprocessorMap: ExistingRawSourceMap | undefined
let modules: Record<string, string> | undefined
const deps = new Set<string>()
// 2. pre-processors: sass etc.
if (isPreProcessor(lang)) {
const preProcessor = preProcessors[lang]
let opts = (preprocessorOptions && preprocessorOptions[lang]) || {}
// support @import from node dependencies by default
switch (lang) {
case PreprocessLang.scss:
case PreprocessLang.sass:
opts = {
includePaths: ['node_modules'],
alias: config.resolve.alias,
...opts
}
break
case PreprocessLang.less:
case PreprocessLang.styl:
case PreprocessLang.stylus:
opts = {
paths: ['node_modules'],
alias: config.resolve.alias,
...opts
}
}
// important: set this for relative import resolving
opts.filename = cleanUrl(id)
opts.enableSourcemap = devSourcemap ?? false
const preprocessResult = await preProcessor(
code,
config.root,
opts,
atImportResolvers
)
if (preprocessResult.errors.length) {
throw preprocessResult.errors[0]
}
code = preprocessResult.code
preprocessorMap = combineSourcemapsIfExists(
opts.filename,
preprocessResult.map,
preprocessResult.additionalMap
)
if (preprocessResult.deps) {
preprocessResult.deps.forEach((dep) => {
// sometimes sass registers the file itself as a dep
if (normalizePath(dep) !== normalizePath(opts.filename)) {
deps.add(dep)
}
})
}
}
// 3. postcss
const postcssOptions = (postcssConfig && postcssConfig.options) || {}
const postcssPlugins =
postcssConfig && postcssConfig.plugins ? postcssConfig.plugins.slice() : []
if (needInlineImport) {
postcssPlugins.unshift(
(await import('postcss-import')).default({
async resolve(id, basedir) {
const publicFile = checkPublicFile(id, config)
if (publicFile) {
return publicFile
}
const resolved = await atImportResolvers.css(
id,
path.join(basedir, '*')
)
if (resolved) {
return path.resolve(resolved)
}
return id
}
})
)
}
postcssPlugins.push(
UrlRewritePostcssPlugin({
replacer: urlReplacer,
logger: config.logger
})
)
if (isModule) {
postcssPlugins.unshift(
(await import('postcss-modules')).default({
...modulesOptions,
getJSON(
cssFileName: string,
_modules: Record<string, string>,
outputFileName: string
) {
modules = _modules
if (modulesOptions && typeof modulesOptions.getJSON === 'function') {
modulesOptions.getJSON(cssFileName, _modules, outputFileName)
}
},
async resolve(id: string) {
for (const key of getCssResolversKeys(atImportResolvers)) {
const resolved = await atImportResolvers[key](id)
if (resolved) {
return path.resolve(resolved)
}
}
return id
}
})
)
}
if (!postcssPlugins.length) {
return {
code,
map: preprocessorMap
}
}
// postcss is an unbundled dep and should be lazy imported
const postcssResult = await (await import('postcss'))
.default(postcssPlugins)
.process(code, {
...postcssOptions,
to: id,
from: id,
...(devSourcemap
? {
map: {
inline: false,
annotation: false,
// postcss may return virtual files
// we cannot obtain content of them, so this needs to be enabled
sourcesContent: true
// when "prev: preprocessorMap", the result map may include duplicate filename in `postcssResult.map.sources`
// prev: preprocessorMap,
}
}
: {})
})
// record CSS dependencies from @imports
for (const message of postcssResult.messages) {
if (message.type === 'dependency') {
deps.add(normalizePath(message.file as string))
} else if (message.type === 'dir-dependency') {
// https://github.com/postcss/postcss/blob/main/docs/guidelines/plugin.md#3-dependencies
const { dir, glob: globPattern = '**' } = message
const pattern =
glob.escapePath(normalizePath(path.resolve(path.dirname(id), dir))) +
`/` +
globPattern
const files = glob.sync(pattern, {
ignore: ['**/node_modules/**']
})
for (let i = 0; i < files.length; i++) {
deps.add(files[i])
}
} else if (message.type === 'warning') {
let msg = `[vite:css] ${message.text}`
if (message.line && message.column) {
msg += `\n${generateCodeFrame(code, {
line: message.line,
column: message.column
})}`
}
config.logger.warn(colors.yellow(msg))
}
}
if (!devSourcemap) {
return {
ast: postcssResult,
code: postcssResult.css,
map: { mappings: '' },
modules,
deps
}
}
const rawPostcssMap = postcssResult.map.toJSON()
const postcssMap = await formatPostcssSourceMap(
// version property of rawPostcssMap is declared as string
// but actually it is a number
rawPostcssMap as Omit<RawSourceMap, 'version'> as ExistingRawSourceMap,
cleanUrl(id)
)
return {
ast: postcssResult,
code: postcssResult.css,
map: combineSourcemapsIfExists(cleanUrl(id), postcssMap, preprocessorMap),
modules,
deps
}
}
export async function formatPostcssSourceMap(
rawMap: ExistingRawSourceMap,
file: string
): Promise<ExistingRawSourceMap> {
const inputFileDir = path.dirname(file)
const sources = rawMap.sources.map((source) => {
const cleanSource = cleanUrl(decodeURIComponent(source))
// postcss returns virtual files
if (/^<.+>$/.test(cleanSource)) {
return `\0${cleanSource}`
}
return normalizePath(path.resolve(inputFileDir, cleanSource))
})
return {
file,
mappings: rawMap.mappings,
names: rawMap.names,
sources,
sourcesContent: rawMap.sourcesContent,
version: rawMap.version
}
}
function combineSourcemapsIfExists(
filename: string,
map1: ExistingRawSourceMap | undefined,
map2: ExistingRawSourceMap | undefined
): ExistingRawSourceMap | undefined {
return map1 && map2
? (combineSourcemaps(filename, [
// type of version property of ExistingRawSourceMap is number
// but it is always 3
map1 as RawSourceMap,
map2 as RawSourceMap
]) as ExistingRawSourceMap)
: map1
}
async function finalizeCss(
css: string,
minify: boolean,
config: ResolvedConfig
) {
// hoist external @imports and @charset to the top of the CSS chunk per spec (#1845 and #6333)