d8623bb90f
Eager import does almost the same thing as `require()` but it instead also supports loading an ES module. ## Bug - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Errors have helpful link attached, see `contributing.md` ## Feature - [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR. - [ ] Related issues linked using `fixes #number` - [ ] Integration tests added - [ ] Documentation added - [ ] Telemetry added. In case of a feature if it's used or not. - [ ] Errors have helpful link attached, see `contributing.md` ## Documentation / Examples - [ ] Make sure the linting passes by running `yarn lint`
272 lines
8.1 KiB
TypeScript
272 lines
8.1 KiB
TypeScript
import { parse } from '../../swc'
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import { buildExports } from './utils'
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const imageExtensions = ['jpg', 'jpeg', 'png', 'webp', 'avif']
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export const createClientComponentFilter = (extensions: string[]) => {
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// Special cases for Next.js APIs that are considered as client components:
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// - .client.[ext]
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// - next built-in client components
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// - .[imageExt]
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const regex = new RegExp(
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'(' +
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`\\.client(\\.(${extensions.join('|')}))?|` +
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`next/(link|image)(\\.js)?|` +
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`\\.(${imageExtensions.join('|')})` +
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')$'
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)
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return (importSource: string) => regex.test(importSource)
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}
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export const createServerComponentFilter = (extensions: string[]) => {
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const regex = new RegExp(`\\.server(\\.(${extensions.join('|')}))?$`)
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return (importSource: string) => regex.test(importSource)
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}
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function createFlightServerRequest(request: string, extensions: string[]) {
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return `next-flight-server-loader?${JSON.stringify({
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extensions,
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})}!${request}`
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}
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function hasFlightLoader(request: string, type: 'client' | 'server') {
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return request.includes(`next-flight-${type}-loader`)
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}
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async function parseModuleInfo({
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resourcePath,
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source,
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extensions,
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isClientCompilation,
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isServerComponent,
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isClientComponent,
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resolver,
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}: {
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resourcePath: string
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source: string
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isClientCompilation: boolean
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extensions: string[]
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isServerComponent: (name: string) => boolean
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isClientComponent: (name: string) => boolean
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resolver: (req: string) => Promise<string>
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}): Promise<{
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source: string
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imports: string[]
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isEsm: boolean
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__N_SSP: boolean
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pageRuntime: 'edge' | 'nodejs' | null
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}> {
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const ast = await parse(source, {
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filename: resourcePath,
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isModule: 'unknown',
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})
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const { type, body } = ast
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let transformedSource = ''
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let lastIndex = 0
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let imports = []
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let __N_SSP = false
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let pageRuntime = null
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const isEsm = type === 'Module'
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for (let i = 0; i < body.length; i++) {
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const node = body[i]
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switch (node.type) {
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case 'ImportDeclaration':
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const importSource = node.source.value
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const resolvedPath = await resolver(importSource)
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const isNodeModuleImport = resolvedPath.includes('/node_modules/')
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// matching node_module package but excluding react cores since react is required to be shared
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const isReactImports = [
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'react',
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'react/jsx-runtime',
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'react/jsx-dev-runtime',
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].includes(importSource)
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if (!isClientCompilation) {
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// Server compilation for .server.js.
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if (isServerComponent(importSource)) {
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continue
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}
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const importDeclarations = source.substring(
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lastIndex,
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node.source.span.start
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)
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if (isClientComponent(importSource)) {
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transformedSource += importDeclarations
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transformedSource += JSON.stringify(
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`next-flight-client-loader!${importSource}`
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)
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imports.push(importSource)
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} else {
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// A shared component. It should be handled as a server component.
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const serverImportSource = isReactImports
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? importSource
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: createFlightServerRequest(importSource, extensions)
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transformedSource += importDeclarations
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transformedSource += JSON.stringify(serverImportSource)
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// TODO: support handling RSC components from node_modules
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if (!isNodeModuleImport) {
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imports.push(importSource)
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}
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}
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} else {
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// For the client compilation, we skip all modules imports but
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// always keep client/shared components in the bundle. All client components
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// have to be imported from either server or client components.
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if (
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isServerComponent(importSource) ||
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hasFlightLoader(importSource, 'server') ||
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// TODO: support handling RSC components from node_modules
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isNodeModuleImport
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) {
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continue
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}
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imports.push(importSource)
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}
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lastIndex = node.source.span.end
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break
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case 'ExportDeclaration':
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if (isClientCompilation) {
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// Keep `__N_SSG` and `__N_SSP` exports.
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if (node.declaration?.type === 'VariableDeclaration') {
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for (const declaration of node.declaration.declarations) {
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if (declaration.type === 'VariableDeclarator') {
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if (declaration.id?.type === 'Identifier') {
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const value = declaration.id.value
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if (value === '__N_SSP') {
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__N_SSP = true
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} else if (value === 'config') {
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const props = declaration.init.properties
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const runtimeKeyValue = props.find(
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(prop: any) => prop.key.value === 'runtime'
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)
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const runtime = runtimeKeyValue?.value?.value
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if (runtime === 'nodejs' || runtime === 'edge') {
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pageRuntime = runtime
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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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}
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break
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default:
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break
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}
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}
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if (!isClientCompilation) {
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transformedSource += source.substring(lastIndex)
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}
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return { source: transformedSource, imports, isEsm, __N_SSP, pageRuntime }
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}
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export default async function transformSource(
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this: any,
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source: string
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): Promise<string> {
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const { client: isClientCompilation, extensions } = this.getOptions()
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const { resourcePath, resolve: resolveFn, context } = this
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const resolver = (req: string): Promise<string> => {
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return new Promise((resolve, reject) => {
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resolveFn(context, req, (err: any, result: string) => {
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if (err) return reject(err)
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resolve(result)
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})
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})
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}
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if (typeof source !== 'string') {
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throw new Error('Expected source to have been transformed to a string.')
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}
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const isServerComponent = createServerComponentFilter(extensions)
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const isClientComponent = createClientComponentFilter(extensions)
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const hasAppliedFlightServerLoader = this.loaders.some((loader: any) => {
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return hasFlightLoader(loader.path, 'server')
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})
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const isServerExt = isServerComponent(resourcePath)
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if (!isClientCompilation) {
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// We only apply the loader to server components, or shared components that
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// are imported by a server component.
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if (!isServerExt && !hasAppliedFlightServerLoader) {
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return source
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}
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}
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const {
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source: transformedSource,
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imports,
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isEsm,
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__N_SSP,
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pageRuntime,
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} = await parseModuleInfo({
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resourcePath,
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source,
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extensions,
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isClientCompilation,
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isServerComponent,
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isClientComponent,
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resolver,
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})
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/**
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* For .server.js files, we handle this loader differently.
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*
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* Server compilation output:
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* (The content of the Server Component module will be kept.)
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* export const __next_rsc__ = { __webpack_require__, _: () => { ... }, server: true }
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*
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* Client compilation output:
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* (The content of the Server Component module will be removed.)
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* export const __next_rsc__ = { __webpack_require__, _: () => { ... }, server: false }
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*/
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const rscExports: any = {
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__next_rsc__: `{
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__webpack_require__,
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_: () => {
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${imports
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.map(
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(importSource) =>
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`import(/* webpackMode: "eager" */ ${JSON.stringify(
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importSource
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)});`
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)
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.join('\n')}
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},
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server: ${isServerExt ? 'true' : 'false'}
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}`,
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}
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if (isClientCompilation) {
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rscExports.default = 'function RSC() {}'
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if (pageRuntime === 'edge') {
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// Currently for the Edge runtime, we treat all RSC pages as SSR pages.
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rscExports.__N_SSP = 'true'
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} else {
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if (__N_SSP) {
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rscExports.__N_SSP = 'true'
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} else {
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// Server component pages are always considered as SSG by default because
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// the flight data is needed for client navigation.
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rscExports.__N_SSG = 'true'
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}
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}
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}
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const output = transformedSource + '\n' + buildExports(rscExports, isEsm)
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return output
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}
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