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123 lines
3.9 KiB
123 lines
3.9 KiB
const { attrsToQuery } = require('./utils')
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const hotReloadAPIPath = JSON.stringify(require.resolve('vue-hot-reload-api'))
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const nonWhitespaceRE = /\S+/
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module.exports = function genStyleInjectionCode (
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loaderContext,
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styles,
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id,
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resourcePath,
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stringifyRequest,
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needsHotReload,
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needsExplicitInjection
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) {
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let styleImportsCode = ``
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let styleInjectionCode = ``
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let cssModulesHotReloadCode = ``
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let hasCSSModules = false
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const cssModuleNames = new Map()
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function genStyleRequest (style, i) {
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const src = style.src || resourcePath
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const attrsQuery = attrsToQuery(style.attrs, 'css')
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const inheritQuery = `&${loaderContext.resourceQuery.slice(1)}`
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// make sure to only pass id when necessary so that we don't inject
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// duplicate tags when multiple components import the same css file
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const idQuery = style.scoped ? `&id=${id}` : ``
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const query = `?vue&type=style&index=${i}${idQuery}${attrsQuery}${inheritQuery}`
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return stringifyRequest(src + query)
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}
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function genCSSModulesCode (style, request, i) {
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hasCSSModules = true
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const moduleName = style.module === true ? '$style' : style.module
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if (cssModuleNames.has(moduleName)) {
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loaderContext.emitError(`CSS module name ${moduleName} is not unique!`)
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}
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cssModuleNames.set(moduleName, true)
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// `(vue-)style-loader` exports the name-to-hash map directly
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// `css-loader` exports it in `.locals`
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const locals = `(style${i}.locals || style${i})`
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const name = JSON.stringify(moduleName)
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if (!needsHotReload) {
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styleInjectionCode += `this[${name}] = ${locals}\n`
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} else {
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styleInjectionCode += `
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cssModules[${name}] = ${locals}
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Object.defineProperty(this, ${name}, {
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configurable: true,
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get: function () {
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return cssModules[${name}]
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}
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})
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`
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cssModulesHotReloadCode += `
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module.hot && module.hot.accept([${request}], function () {
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var oldLocals = cssModules[${name}]
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if (oldLocals) {
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var newLocals = require(${request})
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if (JSON.stringify(newLocals) !== JSON.stringify(oldLocals)) {
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cssModules[${name}] = newLocals
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require(${hotReloadAPIPath}).rerender("${id}")
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}
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}
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})
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`
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}
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}
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// empty styles: with no `src` specified or only contains whitespaces
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const isNotEmptyStyle = style => style.src || nonWhitespaceRE.test(style.content)
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// explicit injection is needed in SSR (for critical CSS collection)
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// or in Shadow Mode (for injection into shadow root)
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// In these modes, vue-style-loader exports objects with the __inject__
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// method; otherwise we simply import the styles.
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if (!needsExplicitInjection) {
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styles.forEach((style, i) => {
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// do not generate requests for empty styles
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if (isNotEmptyStyle(style)) {
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const request = genStyleRequest(style, i)
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styleImportsCode += `import style${i} from ${request}\n`
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if (style.module) genCSSModulesCode(style, request, i)
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}
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})
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} else {
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styles.forEach((style, i) => {
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if (isNotEmptyStyle(style)) {
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const request = genStyleRequest(style, i)
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styleInjectionCode += (
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`var style${i} = require(${request})\n` +
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`if (style${i}.__inject__) style${i}.__inject__(context)\n`
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)
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if (style.module) genCSSModulesCode(style, request, i)
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}
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})
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}
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if (!needsExplicitInjection && !hasCSSModules) {
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return styleImportsCode
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}
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return `
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${styleImportsCode}
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${hasCSSModules && needsHotReload ? `var cssModules = {}` : ``}
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${needsHotReload ? `var disposed = false` : ``}
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function injectStyles (context) {
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${needsHotReload ? `if (disposed) return` : ``}
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${styleInjectionCode}
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}
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${needsHotReload ? `
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module.hot && module.hot.dispose(function (data) {
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disposed = true
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})
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` : ``}
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${cssModulesHotReloadCode}
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`.trim()
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}
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