87 lines
3.0 KiB
JavaScript
87 lines
3.0 KiB
JavaScript
const fs = require('fs-extra')
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const path = require('path')
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const HtmlWebpackPlugin = require('html-webpack-plugin')
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class ModernModePlugin {
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constructor ({ targetDir, isModuleBuild }) {
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this.targetDir = targetDir
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this.isModuleBuild = isModuleBuild
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}
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apply (compiler) {
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if (!this.isModuleBuild) {
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this.applyLegacy(compiler)
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} else {
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this.applyModule(compiler)
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}
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}
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applyLegacy (compiler) {
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const ID = `vue-cli-legacy-bundle`
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compiler.hooks.compilation.tap(ID, compilation => {
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HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapAsync(ID, async (data, cb) => {
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// get stats, write to disk
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await fs.ensureDir(this.targetDir)
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const htmlName = path.basename(data.plugin.options.filename)
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// Watch out for output files in sub directories
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const htmlPath = path.dirname(data.plugin.options.filename)
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const tempFilename = path.join(this.targetDir, htmlPath, `legacy-assets-${htmlName}.json`)
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await fs.mkdirp(path.dirname(tempFilename))
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let tags = data.bodyTags
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if (data.plugin.options.scriptLoading === 'defer') {
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tags = data.headTags
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}
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await fs.writeFile(tempFilename, JSON.stringify(tags))
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cb()
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})
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})
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}
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applyModule (compiler) {
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const ID = `vue-cli-modern-bundle`
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compiler.hooks.compilation.tap(ID, compilation => {
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HtmlWebpackPlugin.getHooks(compilation).alterAssetTagGroups.tapAsync(ID, async (data, cb) => {
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let tags = data.bodyTags
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if (data.plugin.options.scriptLoading === 'defer') {
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tags = data.headTags
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}
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// use <script type="module"> for modern assets
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tags.forEach(tag => {
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if (tag.tagName === 'script' && tag.attributes) {
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tag.attributes.type = 'module'
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}
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})
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// use <link rel="modulepreload"> instead of <link rel="preload">
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// for modern assets
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data.headTags.forEach(tag => {
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if (tag.tagName === 'link' &&
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tag.attributes.rel === 'preload' &&
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tag.attributes.as === 'script') {
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tag.attributes.rel = 'modulepreload'
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}
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})
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// inject links for legacy assets as <script nomodule>
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const htmlName = path.basename(data.plugin.options.filename)
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// Watch out for output files in sub directories
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const htmlPath = path.dirname(data.plugin.options.filename)
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const tempFilename = path.join(this.targetDir, htmlPath, `legacy-assets-${htmlName}.json`)
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const legacyAssets = JSON.parse(await fs.readFile(tempFilename, 'utf-8'))
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.filter(a => a.tagName === 'script' && a.attributes)
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legacyAssets.forEach(a => { a.attributes.nomodule = '' })
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tags.push(...legacyAssets)
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await fs.remove(tempFilename)
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cb()
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})
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HtmlWebpackPlugin.getHooks(compilation).beforeEmit.tap(ID, data => {
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data.html = data.html.replace(/\snomodule="">/g, ' nomodule>')
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})
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})
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}
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}
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module.exports = ModernModePlugin
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