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next.js/server/build/plugins/pages-manifest-plugin.js

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// @flow
import { RawSource } from 'webpack-sources'
import { MATCH_ROUTE_NAME } from '../../utils'
import {PAGES_MANIFEST} from '../../../lib/constants'
// This plugin creates a pages-manifest.json from page entrypoints.
// This is used for mapping paths like `/` to `.next/dist/bundles/pages/index.js` when doing SSR
// It's also used by next export to provide defaultPathMap
export default class PagesManifestPlugin {
apply (compiler: any) {
compiler.plugin('emit', (compilation, callback) => {
const {entries} = compilation
const pages = {}
for (const entry of entries) {
const result = MATCH_ROUTE_NAME.exec(entry.name)
if (!result) {
continue
}
const pagePath = result[1]
if (!pagePath) {
continue
}
const {name} = entry
pages[`/${pagePath.replace(/\\/g, '/')}`] = name
}
compilation.assets[PAGES_MANIFEST] = new RawSource(JSON.stringify(pages))
callback()
})
}
}