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ModuleLoader.ts
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ModuleLoader.ts
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import * as ESTree from 'estree';
import ExternalModule from './ExternalModule';
import Graph from './Graph';
import Module from './Module';
import {
ExternalOption,
GetManualChunk,
IsExternal,
ModuleJSON,
ModuleSideEffectsOption,
PureModulesOption,
ResolvedId,
ResolveIdResult,
TransformModuleJSON
} from './rollup/types';
import {
errBadLoader,
errCannotAssignModuleToChunk,
errEntryCannotBeExternal,
errInternalIdCannotBeExternal,
errInvalidOption,
errNamespaceConflict,
error,
errUnresolvedEntry,
errUnresolvedImport,
errUnresolvedImportTreatedAsExternal
} from './utils/error';
import { isRelative, resolve } from './utils/path';
import { PluginDriver } from './utils/pluginDriver';
import relativeId from './utils/relativeId';
import { timeEnd, timeStart } from './utils/timers';
import transform from './utils/transform';
export interface UnresolvedModule {
fileName: string | null;
id: string;
name: string | null;
}
function normalizeRelativeExternalId(importer: string, source: string) {
return isRelative(source) ? resolve(importer, '..', source) : source;
}
function getIdMatcher<T extends Array<any>>(
option: boolean | string[] | ((id: string, ...args: T) => boolean | null | undefined)
): (id: string, ...args: T) => boolean {
if (option === true) {
return () => true;
}
if (typeof option === 'function') {
return (id, ...args) => (!id.startsWith('\0') && option(id, ...args)) || false;
}
if (option) {
const ids = new Set(Array.isArray(option) ? option : option ? [option] : []);
return (id => ids.has(id)) as (id: string, ...args: T) => boolean;
}
return () => false;
}
function getHasModuleSideEffects(
moduleSideEffectsOption: ModuleSideEffectsOption,
pureExternalModules: PureModulesOption,
graph: Graph
): (id: string, external: boolean) => boolean {
if (typeof moduleSideEffectsOption === 'boolean') {
return () => moduleSideEffectsOption;
}
if (moduleSideEffectsOption === 'no-external') {
return (_id, external) => !external;
}
if (typeof moduleSideEffectsOption === 'function') {
return (id, external) =>
!id.startsWith('\0') ? moduleSideEffectsOption(id, external) !== false : true;
}
if (Array.isArray(moduleSideEffectsOption)) {
const ids = new Set(moduleSideEffectsOption);
return id => ids.has(id);
}
if (moduleSideEffectsOption) {
graph.warn(
errInvalidOption(
'treeshake.moduleSideEffects',
'please use one of false, "no-external", a function or an array'
)
);
}
const isPureExternalModule = getIdMatcher(pureExternalModules);
return (id, external) => !(external && isPureExternalModule(id));
}
export class ModuleLoader {
readonly isExternal: IsExternal;
private readonly getManualChunk: GetManualChunk;
private readonly graph: Graph;
private readonly hasModuleSideEffects: (id: string, external: boolean) => boolean;
private readonly indexedEntryModules: { index: number; module: Module }[] = [];
private latestLoadModulesPromise: Promise<any> = Promise.resolve();
private readonly manualChunkModules: Record<string, Module[]> = {};
private readonly modulesById: Map<string, Module | ExternalModule>;
private nextEntryModuleIndex = 0;
private readonly pluginDriver: PluginDriver;
constructor(
graph: Graph,
modulesById: Map<string, Module | ExternalModule>,
pluginDriver: PluginDriver,
external: ExternalOption,
getManualChunk: GetManualChunk | null,
moduleSideEffects: ModuleSideEffectsOption,
pureExternalModules: PureModulesOption
) {
this.graph = graph;
this.modulesById = modulesById;
this.pluginDriver = pluginDriver;
this.isExternal = getIdMatcher(external);
this.hasModuleSideEffects = getHasModuleSideEffects(
moduleSideEffects,
pureExternalModules,
graph
);
this.getManualChunk = typeof getManualChunk === 'function' ? getManualChunk : () => null;
}
addEntryModules(
unresolvedEntryModules: UnresolvedModule[],
isUserDefined: boolean
): Promise<{
entryModules: Module[];
manualChunkModulesByAlias: Record<string, Module[]>;
newEntryModules: Module[];
}> {
const firstEntryModuleIndex = this.nextEntryModuleIndex;
this.nextEntryModuleIndex += unresolvedEntryModules.length;
const loadNewEntryModulesPromise = Promise.all(
unresolvedEntryModules.map(({ fileName, id, name }) =>
this.loadEntryModule(id, true).then(module => {
if (fileName !== null) {
module.chunkFileNames.add(fileName);
} else if (name !== null) {
if (module.chunkName === null) {
module.chunkName = name;
}
if (isUserDefined) {
module.userChunkNames.add(name);
}
}
return module;
})
)
).then(entryModules => {
let moduleIndex = firstEntryModuleIndex;
for (const entryModule of entryModules) {
entryModule.isUserDefinedEntryPoint = entryModule.isUserDefinedEntryPoint || isUserDefined;
const existingIndexModule = this.indexedEntryModules.find(
indexedModule => indexedModule.module.id === entryModule.id
);
if (!existingIndexModule) {
this.indexedEntryModules.push({ module: entryModule, index: moduleIndex });
} else {
existingIndexModule.index = Math.min(existingIndexModule.index, moduleIndex);
}
moduleIndex++;
}
this.indexedEntryModules.sort(({ index: indexA }, { index: indexB }) =>
indexA > indexB ? 1 : -1
);
return entryModules;
});
return this.awaitLoadModulesPromise(loadNewEntryModulesPromise).then(newEntryModules => ({
entryModules: this.indexedEntryModules.map(({ module }) => module),
manualChunkModulesByAlias: this.manualChunkModules,
newEntryModules
}));
}
addManualChunks(manualChunks: Record<string, string[]>): Promise<void> {
const unresolvedManualChunks: { alias: string; id: string }[] = [];
for (const alias of Object.keys(manualChunks)) {
const manualChunkIds = manualChunks[alias];
for (const id of manualChunkIds) {
unresolvedManualChunks.push({ id, alias });
}
}
const loadNewManualChunkModulesPromise = Promise.all(
unresolvedManualChunks.map(({ id }) => this.loadEntryModule(id, false))
).then(manualChunkModules => {
for (let index = 0; index < manualChunkModules.length; index++) {
this.addModuleToManualChunk(unresolvedManualChunks[index].alias, manualChunkModules[index]);
}
});
return this.awaitLoadModulesPromise(loadNewManualChunkModulesPromise);
}
async resolveId(
source: string,
importer: string,
skip?: number | null
): Promise<ResolvedId | null> {
return this.normalizeResolveIdResult(
this.isExternal(source, importer, false)
? false
: await this.pluginDriver.hookFirst('resolveId', [source, importer], null, skip),
importer,
source
);
}
private addModuleToManualChunk(alias: string, module: Module) {
if (module.manualChunkAlias !== null && module.manualChunkAlias !== alias) {
error(errCannotAssignModuleToChunk(module.id, alias, module.manualChunkAlias));
}
module.manualChunkAlias = alias;
if (!this.manualChunkModules[alias]) {
this.manualChunkModules[alias] = [];
}
this.manualChunkModules[alias].push(module);
}
private awaitLoadModulesPromise<T>(loadNewModulesPromise: Promise<T>): Promise<T> {
this.latestLoadModulesPromise = Promise.all([
loadNewModulesPromise,
this.latestLoadModulesPromise
]);
const getCombinedPromise = (): Promise<void> => {
const startingPromise = this.latestLoadModulesPromise;
return startingPromise.then(() => {
if (this.latestLoadModulesPromise !== startingPromise) {
return getCombinedPromise();
}
});
};
return getCombinedPromise().then(() => loadNewModulesPromise);
}
private fetchAllDependencies(module: Module) {
const fetchDynamicImportsPromise = Promise.all(
module.getDynamicImportExpressions().map((specifier, index) =>
this.resolveDynamicImport(module, specifier as string | ESTree.Node, module.id).then(
resolvedId => {
if (resolvedId === null) return;
const dynamicImport = module.dynamicImports[index];
if (typeof resolvedId === 'string') {
dynamicImport.resolution = resolvedId;
return;
}
return this.fetchResolvedDependency(
relativeId(resolvedId.id),
module.id,
resolvedId
).then(module => {
dynamicImport.resolution = module;
});
}
)
)
);
fetchDynamicImportsPromise.catch(() => {});
return Promise.all(
module.sources.map(source => this.resolveAndFetchDependency(module, source))
).then(() => fetchDynamicImportsPromise);
}
private fetchModule(
id: string,
importer: string,
moduleSideEffects: boolean,
isEntry: boolean
): Promise<Module> {
const existingModule = this.modulesById.get(id);
if (existingModule) {
if (existingModule instanceof ExternalModule)
throw new Error(`Cannot fetch external module ${id}`);
existingModule.isEntryPoint = existingModule.isEntryPoint || isEntry;
return Promise.resolve(existingModule);
}
const module: Module = new Module(this.graph, id, moduleSideEffects, isEntry);
this.modulesById.set(id, module);
this.graph.watchFiles[id] = true;
const manualChunkAlias = this.getManualChunk(id);
if (typeof manualChunkAlias === 'string') {
this.addModuleToManualChunk(manualChunkAlias, module);
}
timeStart('load modules', 3);
return Promise.resolve(this.pluginDriver.hookFirst('load', [id]))
.catch((err: Error) => {
timeEnd('load modules', 3);
let msg = `Could not load ${id}`;
if (importer) msg += ` (imported by ${importer})`;
msg += `: ${err.message}`;
err.message = msg;
throw err;
})
.then(source => {
timeEnd('load modules', 3);
if (typeof source === 'string') return { code: source };
if (source && typeof source === 'object' && typeof source.code === 'string') return source;
return error(errBadLoader(id));
})
.then(sourceDescription => {
const cachedModule = this.graph.cachedModules.get(id);
if (
cachedModule &&
!cachedModule.customTransformCache &&
cachedModule.originalCode === sourceDescription.code
) {
if (cachedModule.transformFiles) {
for (const emittedFile of cachedModule.transformFiles)
this.pluginDriver.emitFile(emittedFile);
}
return cachedModule;
}
if (typeof sourceDescription.moduleSideEffects === 'boolean') {
module.moduleSideEffects = sourceDescription.moduleSideEffects;
}
return transform(this.graph, sourceDescription, module);
})
.then((source: TransformModuleJSON | ModuleJSON) => {
module.setSource(source);
this.modulesById.set(id, module);
return this.fetchAllDependencies(module).then(() => {
for (const name in module.exports) {
if (name !== 'default') {
module.exportsAll[name] = module.id;
}
}
module.exportAllSources.forEach(source => {
const id = module.resolvedIds[source].id;
const exportAllModule = this.modulesById.get(id);
if (exportAllModule instanceof ExternalModule) return;
for (const name in (exportAllModule as Module).exportsAll) {
if (name in module.exportsAll) {
this.graph.warn(errNamespaceConflict(name, module, exportAllModule as Module));
} else {
module.exportsAll[name] = (exportAllModule as Module).exportsAll[name];
}
}
});
return module;
});
});
}
private fetchResolvedDependency(
source: string,
importer: string,
resolvedId: ResolvedId
): Promise<Module | ExternalModule> {
if (resolvedId.external) {
if (!this.modulesById.has(resolvedId.id)) {
this.modulesById.set(
resolvedId.id,
new ExternalModule(this.graph, resolvedId.id, resolvedId.moduleSideEffects)
);
}
const externalModule = this.modulesById.get(resolvedId.id);
if (!(externalModule instanceof ExternalModule)) {
return error(errInternalIdCannotBeExternal(source, importer));
}
return Promise.resolve(externalModule);
} else {
return this.fetchModule(resolvedId.id, importer, resolvedId.moduleSideEffects, false);
}
}
private handleMissingImports(
resolvedId: ResolvedId | null,
source: string,
importer: string
): ResolvedId {
if (resolvedId === null) {
if (isRelative(source)) {
error(errUnresolvedImport(source, importer));
}
this.graph.warn(errUnresolvedImportTreatedAsExternal(source, importer));
return {
external: true,
id: source,
moduleSideEffects: this.hasModuleSideEffects(source, true)
};
}
return resolvedId;
}
private loadEntryModule = (unresolvedId: string, isEntry: boolean): Promise<Module> =>
this.pluginDriver.hookFirst('resolveId', [unresolvedId, undefined]).then(resolveIdResult => {
if (
resolveIdResult === false ||
(resolveIdResult && typeof resolveIdResult === 'object' && resolveIdResult.external)
) {
return error(errEntryCannotBeExternal(unresolvedId));
}
const id =
resolveIdResult && typeof resolveIdResult === 'object'
? resolveIdResult.id
: resolveIdResult;
if (typeof id === 'string') {
return this.fetchModule(id, undefined as any, true, isEntry);
}
return error(errUnresolvedEntry(unresolvedId));
});
private normalizeResolveIdResult(
resolveIdResult: ResolveIdResult,
importer: string,
source: string
): ResolvedId | null {
let id = '';
let external = false;
let moduleSideEffects = null;
if (resolveIdResult) {
if (typeof resolveIdResult === 'object') {
id = resolveIdResult.id;
if (resolveIdResult.external) {
external = true;
}
if (typeof resolveIdResult.moduleSideEffects === 'boolean') {
moduleSideEffects = resolveIdResult.moduleSideEffects;
}
} else {
if (this.isExternal(resolveIdResult, importer, true)) {
external = true;
}
id = external ? normalizeRelativeExternalId(importer, resolveIdResult) : resolveIdResult;
}
} else {
id = normalizeRelativeExternalId(importer, source);
if (resolveIdResult !== false && !this.isExternal(id, importer, true)) {
return null;
}
external = true;
}
return {
external,
id,
moduleSideEffects:
typeof moduleSideEffects === 'boolean'
? moduleSideEffects
: this.hasModuleSideEffects(id, external)
};
}
private async resolveAndFetchDependency(
module: Module,
source: string
): Promise<Module | ExternalModule> {
return this.fetchResolvedDependency(
source,
module.id,
(module.resolvedIds[source] =
module.resolvedIds[source] ||
this.handleMissingImports(await this.resolveId(source, module.id), source, module.id))
);
}
private async resolveDynamicImport(
module: Module,
specifier: string | ESTree.Node,
importer: string
): Promise<ResolvedId | string | null> {
// TODO we only should expose the acorn AST here
const resolution = await this.pluginDriver.hookFirst('resolveDynamicImport', [
specifier,
importer
]);
if (typeof specifier !== 'string') {
if (typeof resolution === 'string') {
return resolution;
}
if (!resolution) {
return null;
}
return {
external: false,
moduleSideEffects: true,
...resolution
} as ResolvedId;
}
if (resolution == null) {
return (module.resolvedIds[specifier] =
module.resolvedIds[specifier] ||
this.handleMissingImports(
await this.resolveId(specifier, module.id),
specifier,
module.id
));
}
return this.handleMissingImports(
this.normalizeResolveIdResult(resolution, importer, specifier),
specifier,
importer
);
}
}