/**
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* @license
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* Copyright 2018 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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function isAsync (chunk) {
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if ('canBeInitial' in chunk) {
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return !chunk.canBeInitial()
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} else {
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return !chunk.isInitial()
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}
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}
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function getChunkEntryNames (chunk) {
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if ('groupsIterable' in chunk) {
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return Array.from(new Set(getNames(chunk.groupsIterable)))
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} else {
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return chunk.entrypoints.map(e => e.options.name)
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}
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}
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function getNames (groups, processed = new Set()) {
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const Entrypoint = require('webpack/lib/Entrypoint')
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const names = []
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for (const group of groups) {
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if (group instanceof Entrypoint) {
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// entrypoint
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if (group.options.name) {
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names.push(group.options.name)
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}
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} else if (!processed.has(group)) {
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processed.add(group)
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names.push(...getNames(group.parentsIterable, processed))
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}
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}
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return names
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}
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function extractChunks ({ compilation, optionsInclude }) {
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let includeChunks
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let includeType
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let includeEntryPoints
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if (optionsInclude && typeof optionsInclude === 'object') {
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includeType = optionsInclude.type
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includeChunks = optionsInclude.chunks
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includeEntryPoints = optionsInclude.entries
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} else {
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if (Array.isArray(optionsInclude)) {
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includeChunks = optionsInclude
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} else {
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includeType = optionsInclude
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}
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}
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let chunks = compilation.chunks
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if (Array.isArray(includeChunks)) {
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chunks = chunks.filter((chunk) => {
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return chunk.name && includeChunks.includes(chunk.name)
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})
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}
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if (Array.isArray(includeEntryPoints)) {
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chunks = chunks.filter(chunk => {
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const names = getChunkEntryNames(chunk)
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return names.some(name => includeEntryPoints.includes(name))
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})
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}
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// 'asyncChunks' are chunks intended for lazy/async loading usually generated as
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// part of code-splitting with import() or require.ensure(). By default, asyncChunks
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// get wired up using link rel=preload when using this plugin. This behaviour can be
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// configured to preload all types of chunks or just prefetch chunks as needed.
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if (includeType === undefined || includeType === 'asyncChunks') {
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return chunks.filter(isAsync)
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}
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if (includeType === 'initial') {
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return chunks.filter(chunk => !isAsync(chunk))
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}
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if (includeType === 'allChunks') {
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// Async chunks, vendor chunks, normal chunks.
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return chunks
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}
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if (includeType === 'allAssets') {
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// Every asset, regardless of which chunk it's in.
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// Wrap it in a single, "psuedo-chunk" return value.
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return [{ files: Object.keys(compilation.assets) }]
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}
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return chunks
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}
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module.exports = extractChunks
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