94 lines
2.7 KiB
TypeScript
94 lines
2.7 KiB
TypeScript
import { Compiler, compilation as CompilationType, Plugin } from 'webpack'
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import { STRING_LITERAL_DROP_BUNDLE } from '../../../next-server/lib/constants'
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export const ampFirstEntryNamesMap: WeakMap<
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CompilationType.Compilation,
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string[]
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> = new WeakMap()
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const PLUGIN_NAME = 'DropAmpFirstPagesPlugin'
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// Recursively look up the issuer till it ends up at the root
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function findEntryModule(mod: any): CompilationType.Module | null {
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const queue = new Set([mod])
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for (const module of queue) {
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for (const reason of module.reasons) {
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if (!reason.module) return module
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queue.add(reason.module)
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}
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}
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return null
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}
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function handler(parser: any) {
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function markAsAmpFirst() {
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const entryModule = findEntryModule(parser.state.module)
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if (!entryModule) {
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return
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}
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// @ts-ignore buildInfo exists on Module
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entryModule.buildInfo.NEXT_ampFirst = true
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}
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parser.hooks.varDeclarationConst
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.for(STRING_LITERAL_DROP_BUNDLE)
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.tap(PLUGIN_NAME, markAsAmpFirst)
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parser.hooks.varDeclarationLet
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.for(STRING_LITERAL_DROP_BUNDLE)
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.tap(PLUGIN_NAME, markAsAmpFirst)
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parser.hooks.varDeclaration
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.for(STRING_LITERAL_DROP_BUNDLE)
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.tap(PLUGIN_NAME, markAsAmpFirst)
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}
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// Prevents outputting client pages when they are not needed
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export class DropClientPage implements Plugin {
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ampPages = new Set()
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apply(compiler: Compiler) {
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compiler.hooks.compilation.tap(
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PLUGIN_NAME,
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(compilation, { normalModuleFactory }) => {
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normalModuleFactory.hooks.parser
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.for('javascript/auto')
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.tap(PLUGIN_NAME, handler)
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if (!ampFirstEntryNamesMap.has(compilation)) {
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ampFirstEntryNamesMap.set(compilation, [])
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}
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const ampFirstEntryNamesItem = ampFirstEntryNamesMap.get(
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compilation
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) as string[]
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compilation.hooks.seal.tap(PLUGIN_NAME, () => {
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// Remove preparedEntrypoint that has bundle drop marker
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// This will ensure webpack does not create chunks/bundles for this particular entrypoint
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for (
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let i = compilation._preparedEntrypoints.length - 1;
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i >= 0;
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i--
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) {
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const entrypoint = compilation._preparedEntrypoints[i]
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if (entrypoint?.module?.buildInfo?.NEXT_ampFirst) {
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ampFirstEntryNamesItem.push(entrypoint.name)
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compilation._preparedEntrypoints.splice(i, 1)
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}
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}
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for (let i = compilation.entries.length - 1; i >= 0; i--) {
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const entryModule = compilation.entries[i]
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if (entryModule?.buildInfo?.NEXT_ampFirst) {
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compilation.entries.splice(i, 1)
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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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