/
chunkAssignment.ts
187 lines (175 loc) · 6.1 KB
/
chunkAssignment.ts
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import ExternalModule from '../ExternalModule';
import Module from '../Module';
import { getOrCreate } from './getOrCreate';
type DependentModuleMap = Map<Module, Set<Module>>;
type ChunkDefinitions = { alias: string | null; modules: Module[] }[];
export function getChunkAssignments(
entryModules: readonly Module[],
manualChunkAliasByEntry: ReadonlyMap<Module, string>
): ChunkDefinitions {
const chunkDefinitions: ChunkDefinitions = [];
const modulesInManualChunks = new Set(manualChunkAliasByEntry.keys());
const manualChunkModulesByAlias: Record<string, Module[]> = Object.create(null);
for (const [entry, alias] of manualChunkAliasByEntry) {
const chunkModules = (manualChunkModulesByAlias[alias] =
manualChunkModulesByAlias[alias] || []);
addStaticDependenciesToManualChunk(entry, chunkModules, modulesInManualChunks);
}
for (const [alias, modules] of Object.entries(manualChunkModulesByAlias)) {
chunkDefinitions.push({ alias, modules });
}
const assignedEntryPointsByModule: DependentModuleMap = new Map();
const { dependentEntryPointsByModule, dynamicEntryModules } = analyzeModuleGraph(entryModules);
const dynamicallyDependentEntryPointsByDynamicEntry: DependentModuleMap =
getDynamicDependentEntryPoints(dependentEntryPointsByModule, dynamicEntryModules);
const staticEntries = new Set(entryModules);
function assignEntryToStaticDependencies(
entry: Module,
dynamicDependentEntryPoints: ReadonlySet<Module> | null
) {
const modulesToHandle = new Set([entry]);
for (const module of modulesToHandle) {
const assignedEntryPoints = getOrCreate(assignedEntryPointsByModule, module, () => new Set());
if (
dynamicDependentEntryPoints &&
areEntryPointsContainedOrDynamicallyDependent(
dynamicDependentEntryPoints,
dependentEntryPointsByModule.get(module)!
)
) {
continue;
} else {
assignedEntryPoints.add(entry);
}
for (const dependency of module.getDependenciesToBeIncluded()) {
if (!(dependency instanceof ExternalModule || modulesInManualChunks.has(dependency))) {
modulesToHandle.add(dependency);
}
}
}
}
function areEntryPointsContainedOrDynamicallyDependent(
entryPoints: ReadonlySet<Module>,
containedIn: ReadonlySet<Module>
): boolean {
const entriesToCheck = new Set(entryPoints);
for (const entry of entriesToCheck) {
if (!containedIn.has(entry)) {
if (staticEntries.has(entry)) return false;
const dynamicallyDependentEntryPoints =
dynamicallyDependentEntryPointsByDynamicEntry.get(entry)!;
for (const dependentEntry of dynamicallyDependentEntryPoints) {
entriesToCheck.add(dependentEntry);
}
}
}
return true;
}
for (const entry of entryModules) {
if (!modulesInManualChunks.has(entry)) {
assignEntryToStaticDependencies(entry, null);
}
}
for (const entry of dynamicEntryModules) {
if (!modulesInManualChunks.has(entry)) {
assignEntryToStaticDependencies(
entry,
dynamicallyDependentEntryPointsByDynamicEntry.get(entry)!
);
}
}
chunkDefinitions.push(
...createChunks([...entryModules, ...dynamicEntryModules], assignedEntryPointsByModule)
);
return chunkDefinitions;
}
function addStaticDependenciesToManualChunk(
entry: Module,
manualChunkModules: Module[],
modulesInManualChunks: Set<Module>
): void {
const modulesToHandle = new Set([entry]);
for (const module of modulesToHandle) {
modulesInManualChunks.add(module);
manualChunkModules.push(module);
for (const dependency of module.dependencies) {
if (!(dependency instanceof ExternalModule || modulesInManualChunks.has(dependency))) {
modulesToHandle.add(dependency);
}
}
}
}
function analyzeModuleGraph(entryModules: readonly Module[]): {
dependentEntryPointsByModule: DependentModuleMap;
dynamicEntryModules: Set<Module>;
} {
const dynamicEntryModules = new Set<Module>();
const dependentEntryPointsByModule: DependentModuleMap = new Map();
const entriesToHandle = new Set(entryModules);
for (const currentEntry of entriesToHandle) {
const modulesToHandle = new Set([currentEntry]);
for (const module of modulesToHandle) {
getOrCreate(dependentEntryPointsByModule, module, () => new Set()).add(currentEntry);
for (const dependency of module.getDependenciesToBeIncluded()) {
if (!(dependency instanceof ExternalModule)) {
modulesToHandle.add(dependency);
}
}
for (const { resolution } of module.dynamicImports) {
if (resolution instanceof Module && resolution.includedDynamicImporters.length > 0) {
dynamicEntryModules.add(resolution);
entriesToHandle.add(resolution);
}
}
for (const dependency of module.implicitlyLoadedBefore) {
dynamicEntryModules.add(dependency);
entriesToHandle.add(dependency);
}
}
}
return { dependentEntryPointsByModule, dynamicEntryModules };
}
function getDynamicDependentEntryPoints(
dependentEntryPointsByModule: DependentModuleMap,
dynamicEntryModules: ReadonlySet<Module>
): DependentModuleMap {
const dynamicallyDependentEntryPointsByDynamicEntry: DependentModuleMap = new Map();
for (const dynamicEntry of dynamicEntryModules) {
const dynamicDependentEntryPoints = getOrCreate(
dynamicallyDependentEntryPointsByDynamicEntry,
dynamicEntry,
() => new Set()
);
for (const importer of [
...dynamicEntry.includedDynamicImporters,
...dynamicEntry.implicitlyLoadedAfter
]) {
for (const entryPoint of dependentEntryPointsByModule.get(importer)!) {
dynamicDependentEntryPoints.add(entryPoint);
}
}
}
return dynamicallyDependentEntryPointsByDynamicEntry;
}
function createChunks(
allEntryPoints: readonly Module[],
assignedEntryPointsByModule: DependentModuleMap
): ChunkDefinitions {
const chunkModules: { [chunkSignature: string]: Module[] } = Object.create(null);
for (const [module, assignedEntryPoints] of assignedEntryPointsByModule) {
let chunkSignature = '';
for (const entry of allEntryPoints) {
chunkSignature += assignedEntryPoints.has(entry) ? 'X' : '_';
}
const chunk = chunkModules[chunkSignature];
if (chunk) {
chunk.push(module);
} else {
chunkModules[chunkSignature] = [module];
}
}
return Object.values(chunkModules).map(modules => ({
alias: null,
modules
}));
}