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css.ts
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css.ts
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import fs from 'node:fs'
import fsp from 'node:fs/promises'
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 'dep-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,
CSS_LANGS_RE,
SPECIAL_QUERY_RE,
} from '../constants'
import type { ResolvedConfig } from '../config'
import type { Plugin } from '../plugin'
import {
arrayEqual,
asyncReplace,
cleanUrl,
combineSourcemaps,
emptyCssComments,
generateCodeFrame,
getHash,
isDataUrl,
isExternalUrl,
isObject,
joinUrlSegments,
normalizePath,
parseRequest,
processSrcSet,
removeDirectQuery,
requireResolveFromRootWithFallback,
stripBase,
stripBomTag,
} from '../utils'
import type { Logger } from '../logger'
import { addToHTMLProxyTransformResult } from './html'
import {
assetUrlRE,
checkPublicFile,
fileToUrl,
generatedAssets,
publicAssetUrlCache,
publicAssetUrlRE,
publicFileToBuiltUrl,
renderAssetUrlInJS,
} 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: undefined
*/
localsConvention?:
| 'camelCase'
| 'camelCaseOnly'
| 'dashes'
| 'dashesOnly'
| ((
originalClassName: string,
generatedClassName: string,
inputFile: string,
) => string)
}
const cssModuleRE = new RegExp(`\\.module${CSS_LANGS_RE.source}`)
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',
}
const enum PostCssDialectLang {
sss = 'sugarss',
}
type CssLang =
| keyof typeof PureCssLang
| keyof typeof PreprocessLang
| keyof typeof PostCssDialectLang
export const isCSSRequest = (request: string): boolean =>
CSS_LANGS_RE.test(request)
export const isModuleCSSRequest = (request: string): boolean =>
cssModuleRE.test(request)
export const isDirectCSSRequest = (request: string): boolean =>
CSS_LANGS_RE.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>
>()
const postcssConfigCache = new WeakMap<
ResolvedConfig,
PostCSSConfigResult | null | Promise<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: [],
})
// warm up cache for resolved postcss config
resolvePostcssConfig(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>())
},
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 joinUrlSegments(config.base, url)
}
}
const resolved = await resolveUrl(url, importer)
if (resolved) {
return fileToUrl(resolved, config, this)
}
if (config.command === 'build') {
// #9800 If we cannot resolve the css url, leave a warning.
config.logger.warnOnce(
`\n${url} referenced in ${id} didn't resolve at build time, it will remain unchanged to be resolved at runtime`,
)
}
return url
}
const {
code: css,
modules,
deps,
map,
} = await compileCSS(id, raw, config, urlReplacer)
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)
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>()
const devBase = config.base
for (const file of deps) {
depModules.add(
isCSSRequest(file)
? moduleGraph.createFileOnlyEntry(file)
: await moduleGraph.ensureEntryFromUrl(
stripBase(
await fileToUrl(file, config, this),
(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<RenderedChunk>
// 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<RenderedChunk>()
outputToExtractedCSSMap = new Map<NormalizedOutputOptions, string>()
hasEmitted = false
},
async transform(css, id, options) {
if (
!isCSSRequest(id) ||
commonjsProxyRE.test(id) ||
SPECIAL_QUERY_RE.test(id)
) {
return
}
css = stripBomTag(css)
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()
if (sourcemap.mappings && !sourcemap.sourcesContent) {
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 code = [
`import { updateStyle as __vite__updateStyle, removeStyle as __vite__removeStyle } from ${JSON.stringify(
path.posix.join(config.base, 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')
return { code, map: { mappings: '' } }
}
// 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.cssMinify) {
content = await minifyCSS(content, config)
}
code = `export default ${JSON.stringify(content)}`
}
} else {
// if moduleCode exists return it **even if** it does not have `?used`
// this will disable tree-shake to work with `import './foo.module.css'` but this usually does not happen
// this is a limitation of the current approach by `?used` to make tree-shake work
// See #8936 for more details
code = modulesCode || `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 (styles.has(id)) {
chunkCSS += styles.get(id)
// a css module contains JS, so it makes this not a pure css chunk
if (cssModuleRE.test(id)) {
isPureCssChunk = false
}
} else {
// if the module does not have a style, then it's not a pure css chunk.
// this is true because in the `transform` hook above, only modules
// that are css gets added to the `styles` map.
isPureCssChunk = false
}
}
if (!chunkCSS) {
return null
}
const publicAssetUrlMap = publicAssetUrlCache.get(config)!
// resolve asset URL placeholders to their built file URLs
const 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[0] === '.' ? relativePath : './' + relativePath
}
// replace asset url references with resolved url.
chunkCSS = chunkCSS.replace(assetUrlRE, (_, fileHash, postfix = '') => {
const filename = this.getFileName(fileHash) + 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 normalizePath(
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)
}
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')
chunkCSS = resolveAssetUrlsInCss(chunkCSS, cssAssetName)
chunkCSS = await finalizeCss(chunkCSS, true, config)
// emit corresponding css file
const referenceId = this.emitFile({
name: path.basename(cssFileName),
type: 'asset',
source: chunkCSS,
})
const originalName = isPreProcessor(lang) ? cssAssetName : cssFileName
const isEntry = chunk.isEntry && isPureCssChunk
generatedAssets
.get(config)!
.set(referenceId, { originalName, isEntry })
chunk.viteMetadata!.importedCss.add(this.getFileName(referenceId))
} else if (!config.build.ssr) {
// legacy build and inline css
// Entry chunk CSS will be collected into `chunk.viteMetadata.importedCss`
// and injected later by the `'vite:build-html'` plugin into the `index.html`
// so it will be duplicated. (https://github.com/vitejs/vite/issues/2062#issuecomment-782388010)
// But because entry chunk can be imported by dynamic import,
// we shouldn't remove the inlined CSS. (#10285)
chunkCSS = await finalizeCss(chunkCSS, true, config)
let cssString = JSON.stringify(chunkCSS)
cssString =
renderAssetUrlInJS(
this,
config,
chunk,
opts,
cssString,
)?.toString() || cssString
const style = `__vite_style__`
const injectCode =
`var ${style} = document.createElement('style');` +
`${style}.textContent = ${cssString};` +
`document.head.appendChild(${style});`
const wrapIdx = code.indexOf('System.register')
const insertMark = "'use strict';"
const insertIdx = code.indexOf(insertMark, wrapIdx)
const s = new MagicString(code)
s.appendLeft(insertIdx + insertMark.length, injectCode)
if (config.build.sourcemap) {
// resolve public URL from CSS paths, we need to use absolute paths
return {
code: s.toString(),
map: s.generateMap({ hires: true }),
}
} else {
return { code: s.toString() }
}
}
} else {
chunkCSS = resolveAssetUrlsInCss(chunkCSS, cssBundleName)
// finalizeCss is called for the aggregated chunk in generateBundle
outputToExtractedCSSMap.set(
opts,
(outputToExtractedCSSMap.get(opts) || '') + chunkCSS,
)
}
return null
},
augmentChunkHash(chunk) {
if (chunk.viteMetadata?.importedCss.size) {
let hash = ''
for (const id of chunk.viteMetadata.importedCss) {
hash += id
}
return hash
}
},
async generateBundle(opts, bundle) {
// @ts-expect-error asset emits are skipped in legacy bundle
if (opts.__vite_skip_asset_emit__) {
return
}
// remove empty css chunks and their imports
if (pureCssChunks.size) {
// map each pure css chunk (rendered chunk) to it's corresponding bundle
// chunk. we check that by comparing the `moduleIds` as they have different
// filenames (rendered chunk has the !~{XXX}~ placeholder)
const pureCssChunkNames: string[] = []
for (const pureCssChunk of pureCssChunks) {
for (const key in bundle) {
const bundleChunk = bundle[key]
if (
bundleChunk.type === 'chunk' &&
arrayEqual(bundleChunk.moduleIds, pureCssChunk.moduleIds)
) {
pureCssChunkNames.push(key)
break
}
}
}
const emptyChunkFiles = pureCssChunkNames
.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 (pureCssChunkNames.includes(file)) {
const { importedCss } = (bundle[file] as OutputChunk)
.viteMetadata!
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)!
pureCssChunkNames.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'],
conditions: ['style'],
tryIndex: false,
preferRelative: true,
}))
)
},
get sass() {
return (
sassResolve ||
(sassResolve = config.createResolver({
extensions: ['.scss', '.sass', '.css'],
mainFields: ['sass', 'style'],
conditions: ['sass', 'style'],
tryIndex: true,
tryPrefix: '_',
preferRelative: true,
}))
)
},
get less() {
return (
lessResolve ||
(lessResolve = config.createResolver({
extensions: ['.less', '.css'],
mainFields: ['less', 'style'],
conditions: ['less', 'style'],
tryIndex: false,
preferRelative: true,
}))
)
},
}
}
function getCssResolversKeys(
resolvers: CSSAtImportResolvers,
): Array<keyof CSSAtImportResolvers> {
return Object.keys(resolvers) as unknown as Array<keyof CSSAtImportResolvers>
}
const configToAtImportResolvers = new WeakMap<
ResolvedConfig,
CSSAtImportResolvers
>()
async function compileCSS(
id: string,
code: string,
config: ResolvedConfig,
urlReplacer?: CssUrlReplacer,
): 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 lang = id.match(CSS_LANGS_RE)?.[1] as CssLang | undefined
const postcssConfig = await resolvePostcssConfig(config)
// 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>()
let atImportResolvers = configToAtImportResolvers.get(config)!
if (!atImportResolvers) {
atImportResolvers = createCSSResolvers(config)
configToAtImportResolvers.set(config, atImportResolvers)
}
// 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.error) {
throw preprocessResult.error
}
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 lazyImport('postcss-import', () => 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
},
nameLayer(index) {
return `vite--anon-layer-${getHash(id)}-${index}`
},
}),
)
}
if (urlReplacer) {
postcssPlugins.push(
UrlRewritePostcssPlugin({
replacer: urlReplacer,
logger: config.logger,
}),
)
}
if (isModule) {
postcssPlugins.unshift(
(
await lazyImport('postcss-modules', () => import('postcss-modules'))
).default({
...modulesOptions,
localsConvention: modulesOptions?.localsConvention,
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, importer: string) {
for (const key of getCssResolversKeys(atImportResolvers)) {
const resolved = await atImportResolvers[key](id, importer)
if (resolved) {
return path.resolve(resolved)
}
}
return id
},
}),
)
}
if (!postcssPlugins.length) {
return {
code,
map: preprocessorMap,
}
}
let postcssResult: PostCSS.Result
try {
const source = removeDirectQuery(id)
const postcss = await lazyImport('postcss', () => import('postcss'))
// postcss is an unbundled dep and should be lazy imported
postcssResult = await postcss.default(postcssPlugins).process(code, {
...postcssOptions,
parser:
lang === 'sss'
? loadPreprocessor(PostCssDialectLang.sss, config.root)
: postcssOptions.parser,
to: source,
from: source,
...(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