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import path from 'path'
import fs from 'fs/promises'
import { webpack, sources } from 'next/dist/compiled/webpack/webpack'
import {
PAGES_MANIFEST,
APP_PATHS_MANIFEST,
} from '../../../shared/lib/constants'
import getRouteFromEntrypoint from '../../../server/get-route-from-entrypoint'
import { normalizePathSep } from '../../../shared/lib/page-path/normalize-path-sep'
export type PagesManifest = { [page: string]: string }
export let edgeServerPages = {}
export let nodeServerPages = {}
export let edgeServerAppPaths = {}
export let nodeServerAppPaths = {}
// This plugin creates a pages-manifest.json from page entrypoints.
// This is used for mapping paths like `/` to `.next/server/static/<buildid>/pages/index.js` when doing SSR
// It's also used by next export to provide defaultPathMap
export default class PagesManifestPlugin
implements webpack.WebpackPluginInstance
{
dev: boolean
distDir?: string
isEdgeRuntime: boolean
appDirEnabled: boolean
constructor({
dev,
distDir,
isEdgeRuntime,
appDirEnabled,
}: {
dev: boolean
distDir?: string
isEdgeRuntime: boolean
appDirEnabled: boolean
}) {
this.dev = dev
this.distDir = distDir
this.isEdgeRuntime = isEdgeRuntime
this.appDirEnabled = appDirEnabled
}
async createAssets(compilation: any) {
const entrypoints = compilation.entrypoints
const pages: PagesManifest = {}
const appPaths: PagesManifest = {}
for (const entrypoint of entrypoints.values()) {
const pagePath = getRouteFromEntrypoint(
entrypoint.name,
this.appDirEnabled
)
if (!pagePath) {
continue
}
const files = entrypoint
.getFiles()
.filter(
(file: string) =>
!file.includes('webpack-runtime') &&
!file.includes('webpack-api-runtime') &&
file.endsWith('.js')
)
// Skip entries which are empty
if (!files.length) {
continue
}
// Write filename, replace any backslashes in path (on windows) with forwardslashes for cross-platform consistency.
let file = files[files.length - 1]
if (!this.dev) {
if (!this.isEdgeRuntime) {
file = file.slice(3)
}
}
file = normalizePathSep(file)
if (entrypoint.name.startsWith('app/')) {
appPaths[pagePath] = file
} else {
pages[pagePath] = file
}
}
// This plugin is used by both the Node server and Edge server compilers,
// we need to merge both pages to generate the full manifest.
if (this.isEdgeRuntime) {
edgeServerPages = pages
edgeServerAppPaths = appPaths
} else {
nodeServerPages = pages
nodeServerAppPaths = appPaths
}
// handle parallel compilers writing to the same
// manifest path by merging existing manifest with new
const writeMergedManifest = async (
manifestPath: string,
entries: Record<string, string>
) => {
await fs.mkdir(path.dirname(manifestPath), { recursive: true })
await fs.writeFile(
manifestPath,
JSON.stringify(
{
...(await fs
.readFile(manifestPath, 'utf8')
.then((res) => JSON.parse(res))
.catch(() => ({}))),
...entries,
},
null,
2
)
)
}
if (this.distDir) {
const pagesManifestPath = path.join(
this.distDir,
'server',
PAGES_MANIFEST
)
await writeMergedManifest(pagesManifestPath, {
...edgeServerPages,
...nodeServerPages,
})
} else {
const pagesManifestPath =
(!this.dev && !this.isEdgeRuntime ? '../' : '') + PAGES_MANIFEST
compilation.emitAsset(
pagesManifestPath,
new sources.RawSource(
JSON.stringify(
{
...edgeServerPages,
...nodeServerPages,
},
null,
2
)
)
)
}
if (this.appDirEnabled) {
if (this.distDir) {
const appPathsManifestPath = path.join(
this.distDir,
'server',
APP_PATHS_MANIFEST
)
await writeMergedManifest(appPathsManifestPath, {
...edgeServerAppPaths,
...nodeServerAppPaths,
})
} else {
compilation.emitAsset(
(!this.dev && !this.isEdgeRuntime ? '../' : '') + APP_PATHS_MANIFEST,
new sources.RawSource(
JSON.stringify(
{
...edgeServerAppPaths,
...nodeServerAppPaths,
},
null,
2
)
) as unknown as webpack.sources.RawSource
)
}
}
}
apply(compiler: webpack.Compiler): void {
compiler.hooks.make.tap('NextJsPagesManifest', (compilation) => {
compilation.hooks.processAssets.tapPromise(
{
name: 'NextJsPagesManifest',
stage: webpack.Compilation.PROCESS_ASSETS_STAGE_ADDITIONS,
},
() => this.createAssets(compilation)
)
})
}
}
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