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buildPluginCss.ts
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buildPluginCss.ts
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import path from 'path'
import { Plugin } from 'rollup'
import { resolveAsset, registerAssets } from './buildPluginAsset'
import { BuildConfig } from '../config'
import hash_sum from 'hash-sum'
import {
urlRE,
compileCss,
cssPreprocessLangRE,
rewriteCssUrls,
isCSSRequest,
cssModuleRE
} from '../utils/cssUtils'
import {
SFCStyleCompileResults,
SFCAsyncStyleCompileOptions
} from '@vue/compiler-sfc'
import chalk from 'chalk'
import { CssPreprocessOptions } from '../config'
const debug = require('debug')('vite:build:css')
const cssInjectionMarker = `__VITE_CSS__`
const cssInjectionRE = /__VITE_CSS__\(\)/g
interface BuildCssOption {
root: string
publicBase: string
assetsDir: string
minify?: BuildConfig['minify']
inlineLimit?: number
cssCodeSplit?: boolean
preprocessOptions?: CssPreprocessOptions
modulesOptions?: SFCAsyncStyleCompileOptions['modulesOptions']
}
export const createBuildCssPlugin = ({
root,
publicBase,
assetsDir,
minify = false,
inlineLimit = 0,
cssCodeSplit = true,
preprocessOptions,
modulesOptions = {}
}: BuildCssOption): Plugin => {
const styles: Map<string, string> = new Map()
const assets = new Map<string, Buffer>()
let staticCss = ''
return {
name: 'vite:css',
async transform(css: string, id: string) {
if (isCSSRequest(id)) {
// if this is a Vue SFC style request, it's already processed by
// rollup-plugin-vue and we just need to rewrite URLs + collect it
const isVueStyle = /\?vue&type=style/.test(id)
const preprocessLang = id.replace(
cssPreprocessLangRE,
'$2'
) as SFCAsyncStyleCompileOptions['preprocessLang']
const result = isVueStyle
? css
: await compileCss(
root,
id,
{
id: '',
source: css,
filename: id,
scoped: false,
modules: cssModuleRE.test(id),
preprocessLang,
preprocessOptions,
modulesOptions
},
true
)
let modules: SFCStyleCompileResults['modules']
if (typeof result === 'string') {
css = result
} else {
if (result.errors.length) {
console.error(`[vite] error applying css transforms: `)
result.errors.forEach(console.error)
}
css = result.code
modules = result.modules
}
// process url() - register referenced files as assets
// and rewrite the url to the resolved public path
if (urlRE.test(css)) {
const fileDir = path.dirname(id)
css = await rewriteCssUrls(css, async (rawUrl) => {
const file = path.posix.isAbsolute(rawUrl)
? path.join(root, rawUrl)
: path.join(fileDir, rawUrl)
const { fileName, content, url } = await resolveAsset(
file,
root,
publicBase,
assetsDir,
inlineLimit
)
if (fileName && content) {
assets.set(fileName, content)
}
debug(
`url(${rawUrl}) -> ${
url.startsWith('data:') ? `base64 inlined` : `url(${url})`
}`
)
return url
})
}
styles.set(id, css)
return {
code: modules
? `export default ${JSON.stringify(modules)}`
: (cssCodeSplit
? // If code-splitting CSS, inject a fake marker to avoid the module
// from being tree-shaken. This preserves the .css file as a
// module in the chunk's metadata so that we can retrieve them in
// renderChunk.
`${cssInjectionMarker}()\n`
: ``) + `export default ${JSON.stringify(css)}`,
map: null
}
}
},
async renderChunk(code, chunk) {
let chunkCSS = ''
for (const id in chunk.modules) {
if (styles.has(id)) {
chunkCSS += styles.get(id)
}
}
if (cssCodeSplit) {
code = code.replace(cssInjectionRE, '')
// for each dynamic entry chunk, collect its css and inline it as JS
// strings.
if (chunk.isDynamicEntry) {
chunkCSS = minifyCSS(chunkCSS)
code =
`let ${cssInjectionMarker} = document.createElement('style');` +
`${cssInjectionMarker}.innerHTML = ${JSON.stringify(chunkCSS)};` +
`document.head.appendChild(${cssInjectionMarker});` +
code
} else {
staticCss += chunkCSS
}
return {
code,
map: null
}
} else {
staticCss += chunkCSS
return null
}
},
async generateBundle(_options, bundle) {
// minify css
if (minify) {
staticCss = minifyCSS(staticCss)
}
const cssFileName = `style.${hash_sum(staticCss)}.css`
bundle[cssFileName] = {
name: cssFileName,
isAsset: true,
type: 'asset',
fileName: cssFileName,
source: staticCss
}
registerAssets(assets, bundle)
}
}
}
let CleanCSS: any
function minifyCSS(css: string) {
CleanCSS = CleanCSS || require('clean-css')
const res = new CleanCSS({ level: 2, rebase: false }).minify(css)
if (res.errors && res.errors.length) {
console.error(chalk.red(`[vite] error when minifying css:`))
console.error(res.errors)
}
if (res.warnings && res.warnings.length) {
console.error(chalk.yellow(`[vite] warnings when minifying css:`))
console.error(res.warnings)
}
return res.styles
}