import { validate, isJS, getAssetName, onEmit } from './util'
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export default class VueSSRServerPlugin {
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constructor (options = {}) {
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this.options = Object.assign({
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filename: 'vue-ssr-server-bundle.json'
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}, options)
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}
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apply (compiler) {
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validate(compiler)
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const stage = 'PROCESS_ASSETS_STAGE_OPTIMIZE_TRANSFER'
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onEmit(compiler, 'vue-server-plugin', stage, (compilation, cb) => {
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const stats = compilation.getStats().toJson()
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const entryName = Object.keys(stats.entrypoints)[0]
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const entryInfo = stats.entrypoints[entryName]
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if (!entryInfo) {
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// #5553
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return cb()
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}
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const entryAssets = entryInfo.assets
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.map(getAssetName)
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.filter(isJS)
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if (entryAssets.length > 1) {
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throw new Error(
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`Server-side bundle should have one single entry file. ` +
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`Avoid using CommonsChunkPlugin in the server config.`
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)
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}
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const entry = entryAssets[0]
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if (!entry || typeof entry !== 'string') {
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throw new Error(
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`Entry "${entryName}" not found. Did you specify the correct entry option?`
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)
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}
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const bundle = {
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entry,
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files: {},
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maps: {}
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}
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Object.keys(compilation.assets).forEach(name => {
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if (isJS(name)) {
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bundle.files[name] = compilation.assets[name].source()
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} else if (name.match(/\.js\.map$/)) {
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bundle.maps[name.replace(/\.map$/, '')] = JSON.parse(compilation.assets[name].source())
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}
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// do not emit anything else for server
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delete compilation.assets[name]
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})
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const json = JSON.stringify(bundle, null, 2)
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const filename = this.options.filename
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compilation.assets[filename] = {
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source: () => json,
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size: () => json.length
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}
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cb()
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})
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}
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}
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