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// This is needed to avoid cycles in esm/resolve <-> cjs/loader
require('internal/modules/cjs/loader');
const {
Array,
ArrayIsArray,
ArrayPrototypeJoin,
ArrayPrototypePush,
FunctionPrototypeBind,
FunctionPrototypeCall,
ObjectAssign,
ObjectCreate,
ObjectSetPrototypeOf,
PromiseAll,
RegExpPrototypeExec,
SafeArrayIterator,
SafeWeakMap,
StringPrototypeStartsWith,
globalThis,
} = primordials;
const { MessageChannel } = require('internal/worker/io');
const {
ERR_INTERNAL_ASSERTION,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_RETURN_PROPERTY_VALUE,
ERR_INVALID_RETURN_VALUE,
ERR_UNKNOWN_MODULE_FORMAT
} = require('internal/errors').codes;
const { pathToFileURL, isURLInstance, URL } = require('internal/url');
const {
isAnyArrayBuffer,
isArrayBufferView,
} = require('internal/util/types');
const ModuleMap = require('internal/modules/esm/module_map');
const ModuleJob = require('internal/modules/esm/module_job');
const {
defaultResolve,
DEFAULT_CONDITIONS,
} = require('internal/modules/esm/resolve');
const {
initializeImportMeta
} = require('internal/modules/esm/initialize_import_meta');
const { defaultLoad } = require('internal/modules/esm/load');
const { translators } = require(
'internal/modules/esm/translators');
const { getOptionValue } = require('internal/options');
const {
fetchModule,
} = require('internal/modules/esm/fetch_module');
/**
* An ESMLoader instance is used as the main entry point for loading ES modules.
* Currently, this is a singleton -- there is only one used for loading
* the main module and everything in its dependency graph.
*/
class ESMLoader {
/**
* Prior to ESM loading. These are called once before any modules are started.
* @private
* @property {Function[]} globalPreloaders First-in-first-out list of
* preload hooks.
*/
#globalPreloaders = [];
/**
* Phase 2 of 2 in ESM loading.
* @private
* @property {Function[]} loaders First-in-first-out list of loader hooks.
*/
#loaders = [
defaultLoad,
];
/**
* Phase 1 of 2 in ESM loading.
* @private
* @property {Function[]} resolvers First-in-first-out list of resolver hooks
*/
#resolvers = [
defaultResolve,
];
#importMetaInitializer = initializeImportMeta;
/**
* Map of already-loaded CJS modules to use
*/
cjsCache = new SafeWeakMap();
/**
* The index for assigning unique URLs to anonymous module evaluation
*/
evalIndex = 0;
/**
* Registry of loaded modules, akin to `require.cache`
*/
moduleMap = new ModuleMap();
/**
* Methods which translate input code or other information into ES modules
*/
translators = translators;
static pluckHooks({
globalPreload,
resolve,
load,
// obsolete hooks:
dynamicInstantiate,
getFormat,
getGlobalPreloadCode,
getSource,
transformSource,
}) {
const obsoleteHooks = [];
const acceptedHooks = ObjectCreate(null);
if (getGlobalPreloadCode) {
globalPreload ??= getGlobalPreloadCode;
process.emitWarning(
'Loader hook "getGlobalPreloadCode" has been renamed to "globalPreload"'
);
}
if (dynamicInstantiate) ArrayPrototypePush(
obsoleteHooks,
'dynamicInstantiate'
);
if (getFormat) ArrayPrototypePush(
obsoleteHooks,
'getFormat',
);
if (getSource) ArrayPrototypePush(
obsoleteHooks,
'getSource',
);
if (transformSource) ArrayPrototypePush(
obsoleteHooks,
'transformSource',
);
if (obsoleteHooks.length) process.emitWarning(
`Obsolete loader hook(s) supplied and will be ignored: ${
ArrayPrototypeJoin(obsoleteHooks, ', ')
}`,
'DeprecationWarning',
);
// Use .bind() to avoid giving access to the Loader instance when called.
if (globalPreload) {
acceptedHooks.globalPreloader =
FunctionPrototypeBind(globalPreload, null);
}
if (resolve) {
acceptedHooks.resolver = FunctionPrototypeBind(resolve, null);
}
if (load) {
acceptedHooks.loader = FunctionPrototypeBind(load, null);
}
return acceptedHooks;
}
/**
* Collect custom/user-defined hook(s). After all hooks have been collected,
* calls global preload hook(s).
* @param {object | object[]} customLoaders A list of exports from
* user-defined loaders (as returned by ESMLoader.import()).
*/
async addCustomLoaders(
customLoaders = [],
) {
if (!ArrayIsArray(customLoaders)) customLoaders = [customLoaders];
for (let i = 0; i < customLoaders.length; i++) {
const exports = customLoaders[i];
const {
globalPreloader,
resolver,
loader,
} = ESMLoader.pluckHooks(exports);
if (globalPreloader) ArrayPrototypePush(
this.#globalPreloaders,
FunctionPrototypeBind(globalPreloader, null), // [1]
);
if (resolver) ArrayPrototypePush(
this.#resolvers,
FunctionPrototypeBind(resolver, null), // [1]
);
if (loader) ArrayPrototypePush(
this.#loaders,
FunctionPrototypeBind(loader, null), // [1]
);
}
// [1] ensure hook function is not bound to ESMLoader instance
this.preload();
}
async eval(
source,
url = pathToFileURL(`${process.cwd()}/[eval${++this.evalIndex}]`).href
) {
const evalInstance = (url) => {
const { ModuleWrap, callbackMap } = internalBinding('module_wrap');
const module = new ModuleWrap(url, undefined, source, 0, 0);
callbackMap.set(module, {
importModuleDynamically: (specifier, { url }, importAssertions) => {
return this.import(specifier,
this.getBaseURL(url),
importAssertions);
}
});
return module;
};
const job = new ModuleJob(
this, url, undefined, evalInstance, false, false);
this.moduleMap.set(url, undefined, job);
const { module } = await job.run();
return {
namespace: module.getNamespace(),
};
}
/**
* Returns the url to use for the resolution of a given cache key url
* These are not guaranteed to be the same.
*
* In WHATWG HTTP spec for ESM the cache key is the non-I/O bound
* synchronous resolution using only string operations
* ~= resolveImportMap(new URL(specifier, importerHREF))
*
* The url used for subsequent resolution is the response URL after
* all redirects have been resolved.
*
* https://example.com/foo redirecting to https://example.com/bar
* would have a cache key of https://example.com/foo and baseURL
* of https://example.com/bar
*
* MUST BE SYNCHRONOUS for import.meta initialization
* MUST BE CALLED AFTER receiving the url body due to I/O
* @param {string} url
* @returns {string}
*/
getBaseURL(url) {
if (
StringPrototypeStartsWith(url, 'http:') ||
StringPrototypeStartsWith(url, 'https:')
) {
// The request & response have already settled, so they are in
// fetchModule's cache, in which case, fetchModule returns
// immediately and synchronously
url = fetchModule(new URL(url), { parentURL: url }).resolvedHREF;
// This should only occur if the module hasn't been fetched yet
if (typeof url !== 'string') {
throw new ERR_INTERNAL_ASSERTION(`Base url for module ${url} not loaded.`);
}
}
return url;
}
/**
* Get a (possibly still pending) module job from the cache,
* or create one and return its Promise.
* @param {string} specifier The string after `from` in an `import` statement,
* or the first parameter of an `import()`
* expression
* @param {string | undefined} parentURL The URL of the module importing this
* one, unless this is the Node.js entry
* point.
* @param {Record<string, string>} importAssertions Validations for the
* module import.
* @returns {Promise<ModuleJob>} The (possibly pending) module job
*/
async getModuleJob(specifier, parentURL, importAssertions) {
let importAssertionsForResolve;
if (this.#loaders.length !== 1) {
// We can skip cloning if there are no user provided loaders because
// the Node.js default resolve hook does not use import assertions.
importAssertionsForResolve =
ObjectAssign(ObjectCreate(null), importAssertions);
}
const { format, url } =
await this.resolve(specifier, parentURL, importAssertionsForResolve);
let job = this.moduleMap.get(url, importAssertions.type);
// CommonJS will set functions for lazy job evaluation.
if (typeof job === 'function') {
this.moduleMap.set(url, undefined, job = job());
}
if (job === undefined) {
job = this.#createModuleJob(url, importAssertions, parentURL, format);
}
return job;
}
/**
* Create and cache an object representing a loaded module.
* @param {string} url The absolute URL that was resolved for this module
* @param {Record<string, string>} importAssertions Validations for the
* module import.
* @param {string} [parentURL] The absolute URL of the module importing this
* one, unless this is the Node.js entry point
* @param {string} [format] The format hint possibly returned by the
* `resolve` hook
* @returns {Promise<ModuleJob>} The (possibly pending) module job
*/
#createModuleJob(url, importAssertions, parentURL, format) {
const moduleProvider = async (url, isMain) => {
const {
format: finalFormat,
source,
} = await this.load(url, {
format,
importAssertions,
});
const translator = translators.get(finalFormat);
if (!translator) {
throw new ERR_UNKNOWN_MODULE_FORMAT(finalFormat, url);
}
return FunctionPrototypeCall(translator, this, url, source, isMain);
};
const inspectBrk = (
parentURL === undefined &&
getOptionValue('--inspect-brk')
);
const job = new ModuleJob(
this,
url,
importAssertions,
moduleProvider,
parentURL === undefined,
inspectBrk
);
this.moduleMap.set(url, importAssertions.type, job);
return job;
}
/**
* This method is usually called indirectly as part of the loading processes.
* Internally, it is used directly to add loaders. Use directly with caution.
*
* This method must NOT be renamed: it functions as a dynamic import on a
* loader module.
*
* @param {string | string[]} specifiers Path(s) to the module.
* @param {string} parentURL Path of the parent importing the module.
* @param {Record<string, string>} importAssertions Validations for the
* module import.
* @returns {Promise<object | object[]>} A list of module export(s).
*/
async import(specifiers, parentURL, importAssertions) {
const wasArr = ArrayIsArray(specifiers);
if (!wasArr) specifiers = [specifiers];
const count = specifiers.length;
const jobs = new Array(count);
for (let i = 0; i < count; i++) {
jobs[i] = this.getModuleJob(specifiers[i], parentURL, importAssertions)
.then((job) => job.run())
.then(({ module }) => module.getNamespace());
}
const namespaces = await PromiseAll(new SafeArrayIterator(jobs));
return wasArr ?
namespaces :
namespaces[0];
}
/**
* Provide source that is understood by one of Node's translators.
*
* The internals of this WILL change when chaining is implemented,
* depending on the resolution/consensus from #36954
* @param {string} url The URL/path of the module to be loaded
* @param {object} context Metadata about the module
* @returns {object}
*/
async load(url, context = {}) {
const defaultLoader = this.#loaders[0];
const loader = this.#loaders.length === 1 ?
defaultLoader :
this.#loaders[1];
const loaded = await loader(url, context, defaultLoader);
if (typeof loaded !== 'object') {
throw new ERR_INVALID_RETURN_VALUE(
'object',
'loader load',
loaded,
);
}
const {
format,
source,
} = loaded;
if (format == null) {
const dataUrl = RegExpPrototypeExec(
/^data:([^/]+\/[^;,]+)(?:[^,]*?)(;base64)?,/,
url,
);
throw new ERR_UNKNOWN_MODULE_FORMAT(
dataUrl ? dataUrl[1] : format,
url);
}
if (typeof format !== 'string') {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'string',
'loader resolve',
'format',
format,
);
}
if (
source != null &&
typeof source !== 'string' &&
!isAnyArrayBuffer(source) &&
!isArrayBufferView(source)
) throw ERR_INVALID_RETURN_PROPERTY_VALUE(
'string, an ArrayBuffer, or a TypedArray',
'loader load',
'source',
source
);
return {
format,
source,
};
}
preload() {
const count = this.#globalPreloaders.length;
if (!count) return;
for (let i = 0; i < count; i++) {
const channel = new MessageChannel();
const {
port1: insidePreload,
port2: insideLoader,
} = channel;
insidePreload.unref();
insideLoader.unref();
const preload = this.#globalPreloaders[i]({
port: insideLoader
});
if (preload == null) return;
if (typeof preload !== 'string') {
throw new ERR_INVALID_RETURN_VALUE(
'string',
'loader globalPreloadCode',
preload,
);
}
const { compileFunction } = require('vm');
const preloadInit = compileFunction(
preload,
['getBuiltin', 'port', 'setImportMetaCallback'],
{
filename: '<preload>',
}
);
const { NativeModule } = require('internal/bootstrap/loaders');
// We only allow replacing the importMetaInitializer during preload,
// after preload is finished, we disable the ability to replace it
//
// This exposes accidentally setting the initializer too late by
// throwing an error.
let finished = false;
let replacedImportMetaInitializer = false;
let next = this.#importMetaInitializer;
try {
// Calls the compiled preload source text gotten from the hook
// Since the parameters are named we use positional parameters
// see compileFunction above to cross reference the names
FunctionPrototypeCall(
preloadInit,
globalThis,
// Param getBuiltin
(builtinName) => {
if (NativeModule.canBeRequiredByUsers(builtinName)) {
return require(builtinName);
}
throw new ERR_INVALID_ARG_VALUE('builtinName', builtinName);
},
// Param port
insidePreload,
// Param setImportMetaCallback
(fn) => {
if (finished || typeof fn !== 'function') {
throw new ERR_INVALID_ARG_TYPE('fn', fn);
}
replacedImportMetaInitializer = true;
const parent = next;
next = (meta, context) => {
return fn(meta, context, parent);
};
});
} finally {
finished = true;
if (replacedImportMetaInitializer) {
this.#importMetaInitializer = next;
}
}
}
}
importMetaInitialize(meta, context) {
this.#importMetaInitializer(meta, context);
}
/**
* Resolve the location of the module.
*
* The internals of this WILL change when chaining is implemented,
* depending on the resolution/consensus from #36954.
* @param {string} originalSpecifier The specified URL path of the module to
* be resolved.
* @param {string} [parentURL] The URL path of the module's parent.
* @param {ImportAssertions} [importAssertions] Assertions from the import
* statement or expression.
* @returns {{ url: string }}
*/
async resolve(
originalSpecifier,
parentURL,
importAssertions = ObjectCreate(null)
) {
const isMain = parentURL === undefined;
if (
!isMain &&
typeof parentURL !== 'string' &&
!isURLInstance(parentURL)
) throw new ERR_INVALID_ARG_TYPE(
'parentURL',
['string', 'URL'],
parentURL,
);
const conditions = DEFAULT_CONDITIONS;
const defaultResolver = this.#resolvers[0];
const resolver = this.#resolvers.length === 1 ?
defaultResolver :
this.#resolvers[1];
const resolution = await resolver(
originalSpecifier,
{
conditions,
importAssertions,
parentURL,
},
defaultResolver,
);
if (typeof resolution !== 'object') {
throw new ERR_INVALID_RETURN_VALUE(
'object',
'loader resolve',
resolution,
);
}
const { format, url } = resolution;
if (
format != null &&
typeof format !== 'string'
) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'string',
'loader resolve',
'format',
format,
);
}
if (typeof url !== 'string') { // non-strings can be coerced to a url string
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'string',
'loader resolve',
'url',
url,
);
}
new URL(url); // Intentionally trigger error if `url` is invalid
return {
format,
url,
};
}
}
ObjectSetPrototypeOf(ESMLoader.prototype, null);
exports.ESMLoader = ESMLoader;
|