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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,
ObjectDefineProperty,
ObjectSetPrototypeOf,
PromiseAll,
ReflectApply,
RegExpPrototypeExec,
SafeArrayIterator,
SafeWeakMap,
StringPrototypeSlice,
StringPrototypeToUpperCase,
globalThis,
} = primordials;
const { MessageChannel } = require('internal/worker/io');
const {
ERR_LOADER_CHAIN_INCOMPLETE,
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 { emitExperimentalWarning } = require('internal/util');
const {
isAnyArrayBuffer,
isArrayBufferView,
} = require('internal/util/types');
const {
validateObject,
validateString,
} = require('internal/validators');
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');
/**
* @typedef {object} ExportedHooks
* @property {Function} globalPreload
* @property {Function} resolve
* @property {Function} load
*/
/**
* @typedef {Record<string, any>} ModuleExports
*/
/**
* @typedef {object} KeyedExports
* @property {ModuleExports} exports
* @property {URL['href']} url
*/
/**
* @typedef {object} KeyedHook
* @property {Function} fn
* @property {URL['href']} url
*/
/**
* @typedef {'builtin'|'commonjs'|'json'|'module'|'wasm'} ModuleFormat
*/
/**
* @typedef {ArrayBuffer|TypedArray|string} ModuleSource
*/
// [2] `validate...()`s throw the wrong error
let emittedSpecifierResolutionWarning = false;
/**
* A utility function to iterate through a hook chain, track advancement in the
* chain, and generate and supply the `next<HookName>` argument to the custom
* hook.
* @param {KeyedHook[]} chain The whole hook chain.
* @param {object} meta Properties that change as the current hook advances
* along the chain.
* @param {boolean} meta.chainFinished Whether the end of the chain has been
* reached AND invoked.
* @param {string} meta.hookErrIdentifier A user-facing identifier to help
* pinpoint where an error occurred. Ex "file:///foo.mjs 'resolve'".
* @param {number} meta.hookIndex A non-negative integer tracking the current
* position in the hook chain.
* @param {string} meta.hookName The kind of hook the chain is (ex 'resolve')
* @param {boolean} meta.shortCircuited Whether a hook signaled a short-circuit.
* @param {(hookErrIdentifier, hookArgs) => void} validate A wrapper function
* containing all validation of a custom loader hook's intermediary output. Any
* validation within MUST throw.
* @returns {function next<HookName>(...hookArgs)} The next hook in the chain.
*/
function nextHookFactory(chain, meta, { validateArgs, validateOutput }) {
// First, prepare the current
const { hookName } = meta;
const {
fn: hook,
url: hookFilePath,
} = chain[meta.hookIndex];
// ex 'nextResolve'
const nextHookName = `next${
StringPrototypeToUpperCase(hookName[0]) +
StringPrototypeSlice(hookName, 1)
}`;
// When hookIndex is 0, it's reached the default, which does not call next()
// so feed it a noop that blows up if called, so the problem is obvious.
const generatedHookIndex = meta.hookIndex;
let nextNextHook;
if (meta.hookIndex > 0) {
// Now, prepare the next: decrement the pointer so the next call to the
// factory generates the next link in the chain.
meta.hookIndex--;
nextNextHook = nextHookFactory(chain, meta, { validateArgs, validateOutput });
} else {
// eslint-disable-next-line func-name-matching
nextNextHook = function chainAdvancedTooFar() {
throw new ERR_INTERNAL_ASSERTION(
`ESM custom loader '${hookName}' advanced beyond the end of the chain.`
);
};
}
return ObjectDefineProperty(
async (...args) => {
// Update only when hook is invoked to avoid fingering the wrong filePath
meta.hookErrIdentifier = `${hookFilePath} '${hookName}'`;
validateArgs(`${meta.hookErrIdentifier} hook's ${nextHookName}()`, args);
const outputErrIdentifier = `${chain[generatedHookIndex].url} '${hookName}' hook's ${nextHookName}()`;
// Set when next<HookName> is actually called, not just generated.
if (generatedHookIndex === 0) { meta.chainFinished = true; }
// `context` is an optional argument that only needs to be passed when changed
switch (args.length) {
case 1: // It was omitted, so supply the cached value
ArrayPrototypePush(args, meta.context);
break;
case 2: // Overrides were supplied, so update cached value
ObjectAssign(meta.context, args[1]);
break;
}
ArrayPrototypePush(args, nextNextHook);
const output = await ReflectApply(hook, undefined, args);
validateOutput(outputErrIdentifier, output);
if (output?.shortCircuit === true) { meta.shortCircuited = true; }
return output;
},
'name',
{ __proto__: null, value: nextHookName },
);
}
/**
* 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 {KeyedHook[]} globalPreloaders Last-in-first-out
* list of preload hooks.
*/
#globalPreloaders = [];
/**
* Phase 2 of 2 in ESM loading.
* @private
* @property {KeyedHook[]} loaders Last-in-first-out
* collection of loader hooks.
*/
#loaders = [
{
fn: defaultLoad,
url: 'node:internal/modules/esm/load',
},
];
/**
* Phase 1 of 2 in ESM loading.
* @private
* @property {KeyedHook[]} resolvers Last-in-first-out
* collection of resolver hooks.
*/
#resolvers = [
{
fn: defaultResolve,
url: 'node:internal/modules/esm/resolve',
},
];
#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;
constructor() {
if (getOptionValue('--experimental-loader').length > 0) {
emitExperimentalWarning('Custom ESM Loaders');
}
if (getOptionValue('--experimental-network-imports')) {
emitExperimentalWarning('Network Imports');
}
if (
!emittedSpecifierResolutionWarning &&
getOptionValue('--experimental-specifier-resolution') === 'node'
) {
process.emitWarning(
'The Node.js specifier resolution flag is experimental. It could change or be removed at any time.',
'ExperimentalWarning'
);
emittedSpecifierResolutionWarning = true;
}
}
/**
*
* @param {ModuleExports} exports
* @returns {ExportedHooks}
*/
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: ${
ArrayPrototypeJoin(obsoleteHooks, ', ')
}`,
'DeprecationWarning',
);
// Use .bind() to avoid giving access to the Loader instance when called.
if (globalPreload) {
acceptedHooks.globalPreloader =
FunctionPrototypeBind(globalPreload, null);
}
if (resolve) {
acceptedHooks.resolver = FunctionPrototypeBind(resolve, null);
}
if (load) {
acceptedHooks.loader = FunctionPrototypeBind(load, null);
}
return acceptedHooks;
}
/**
* Collect custom/user-defined hook(s). After all hooks have been collected,
* calls global preload hook(s).
* @param {KeyedExports} customLoaders
* A list of exports from user-defined loaders (as returned by
* ESMLoader.import()).
*/
async addCustomLoaders(
customLoaders = [],
) {
for (let i = 0; i < customLoaders.length; i++) {
const {
exports,
url,
} = customLoaders[i];
const {
globalPreloader,
resolver,
loader,
} = ESMLoader.pluckHooks(exports);
if (globalPreloader) {
ArrayPrototypePush(
this.#globalPreloaders,
{
fn: FunctionPrototypeBind(globalPreloader), // [1]
url,
},
);
}
if (resolver) {
ArrayPrototypePush(
this.#resolvers,
{
fn: FunctionPrototypeBind(resolver), // [1]
url,
},
);
}
if (loader) {
ArrayPrototypePush(
this.#loaders,
{
fn: FunctionPrototypeBind(loader), // [1]
url,
},
);
}
}
// [1] ensure hook function is not bound to ESMLoader instance
this.preload();
}
async eval(
source,
url = pathToFileURL(`${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, 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(),
};
}
/**
* 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;
// By default, `this.#loaders` contains just the Node default load hook
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,
responseURL,
source,
} = await this.load(url, {
format,
importAssertions,
});
const translator = translators.get(finalFormat);
if (!translator) {
throw new ERR_UNKNOWN_MODULE_FORMAT(finalFormat, responseURL);
}
return FunctionPrototypeCall(translator, this, responseURL, 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<ExportedHooks | KeyedExports[]>}
* A collection of module export(s) or a list of collections of module
* export(s).
*/
async import(specifiers, parentURL, importAssertions) {
// For loaders, `import` is passed multiple things to process, it returns a
// list pairing the url and exports collected. This is especially useful for
// error messaging, to identity from where an export came. But, in most
// cases, only a single url is being "imported" (ex `import()`), so there is
// only 1 possible url from which the exports were collected and it is
// already known to the caller. Nesting that in a list would only ever
// create redundant work for the caller, so it is later popped off the
// internal list.
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));
if (!wasArr) { return namespaces[0]; } // We can skip the pairing below
for (let i = 0; i < count; i++) {
const namespace = ObjectCreate(null);
namespace.url = specifiers[i];
namespace.exports = namespaces[i];
namespaces[i] = namespace;
}
return namespaces;
}
/**
* Provide source that is understood by one of Node's translators.
*
* Internally, this behaves like a backwards iterator, wherein the stack of
* hooks starts at the top and each call to `nextLoad()` moves down 1 step
* until it reaches the bottom or short-circuits.
*
* @param {URL['href']} url The URL/path of the module to be loaded
* @param {object} context Metadata about the module
* @returns {{ format: ModuleFormat, source: ModuleSource }}
*/
async load(url, context = {}) {
const chain = this.#loaders;
const meta = {
chainFinished: null,
context,
hookErrIdentifier: '',
hookIndex: chain.length - 1,
hookName: 'load',
shortCircuited: false,
};
const validateArgs = (hookErrIdentifier, { 0: nextUrl, 1: ctx }) => {
if (typeof nextUrl !== 'string') {
// non-strings can be coerced to a url string
// validateString() throws a less-specific error
throw new ERR_INVALID_ARG_TYPE(
`${hookErrIdentifier} url`,
'a url string',
nextUrl,
);
}
// Try to avoid expensive URL instantiation for known-good urls
if (!this.moduleMap.has(nextUrl)) {
try {
new URL(nextUrl);
} catch {
throw new ERR_INVALID_ARG_VALUE(
`${hookErrIdentifier} url`,
nextUrl,
'should be a url string',
);
}
}
if (ctx) validateObject(ctx, `${hookErrIdentifier} context`);
};
const validateOutput = (hookErrIdentifier, output) => {
if (typeof output !== 'object' || output === null) { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'an object',
hookErrIdentifier,
output,
);
}
};
const nextLoad = nextHookFactory(chain, meta, { validateArgs, validateOutput });
const loaded = await nextLoad(url, context);
const { hookErrIdentifier } = meta; // Retrieve the value after all settled
validateOutput(hookErrIdentifier, loaded);
if (loaded?.shortCircuit === true) { meta.shortCircuited = true; }
if (!meta.chainFinished && !meta.shortCircuited) {
throw new ERR_LOADER_CHAIN_INCOMPLETE(hookErrIdentifier);
}
const {
format,
source,
} = loaded;
let responseURL = loaded.responseURL;
if (responseURL === undefined) {
responseURL = url;
}
let responseURLObj;
if (typeof responseURL === 'string') {
try {
responseURLObj = new URL(responseURL);
} catch {
// responseURLObj not defined will throw in next branch.
}
}
if (responseURLObj?.href !== responseURL) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'undefined or a fully resolved URL string',
hookErrIdentifier,
'responseURL',
responseURL,
);
}
if (format == null) {
const dataUrl = RegExpPrototypeExec(
/^data:([^/]+\/[^;,]+)(?:[^,]*?)(;base64)?,/,
url,
);
throw new ERR_UNKNOWN_MODULE_FORMAT(
dataUrl ? dataUrl[1] : format,
url);
}
if (typeof format !== 'string') { // [2]
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string',
hookErrIdentifier,
'format',
format,
);
}
if (
source != null &&
typeof source !== 'string' &&
!isAnyArrayBuffer(source) &&
!isArrayBufferView(source)
) {
throw ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string, an ArrayBuffer, or a TypedArray',
hookErrIdentifier,
'source',
source
);
}
return {
format,
responseURL,
source,
};
}
preload() {
for (let i = this.#globalPreloaders.length - 1; i >= 0; i--) {
const channel = new MessageChannel();
const {
port1: insidePreload,
port2: insideLoader,
} = channel;
insidePreload.unref();
insideLoader.unref();
const {
fn: preloader,
url: specifier,
} = this.#globalPreloaders[i];
const preload = preloader({
port: insideLoader,
});
if (preload == null) { return; }
const hookErrIdentifier = `${specifier} globalPreload`;
if (typeof preload !== 'string') { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'a string',
hookErrIdentifier,
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) &&
NativeModule.canBeRequiredWithoutScheme(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.
*
* Internally, this behaves like a backwards iterator, wherein the stack of
* hooks starts at the top and each call to `nextResolve()` moves down 1 step
* until it reaches the bottom or short-circuits.
*
* @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 {{ format: string, url: URL['href'] }}
*/
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 chain = this.#resolvers;
const context = {
conditions: DEFAULT_CONDITIONS,
importAssertions,
parentURL,
};
const meta = {
chainFinished: null,
context,
hookErrIdentifier: '',
hookIndex: chain.length - 1,
hookName: 'resolve',
shortCircuited: false,
};
const validateArgs = (hookErrIdentifier, { 0: suppliedSpecifier, 1: ctx }) => {
validateString(
suppliedSpecifier,
`${hookErrIdentifier} specifier`,
); // non-strings can be coerced to a url string
if (ctx) validateObject(ctx, `${hookErrIdentifier} context`);
};
const validateOutput = (hookErrIdentifier, output) => {
if (typeof output !== 'object' || output === null) { // [2]
throw new ERR_INVALID_RETURN_VALUE(
'an object',
hookErrIdentifier,
output,
);
}
};
const nextResolve = nextHookFactory(chain, meta, { validateArgs, validateOutput });
const resolution = await nextResolve(originalSpecifier, context);
const { hookErrIdentifier } = meta; // Retrieve the value after all settled
validateOutput(hookErrIdentifier, resolution);
if (resolution?.shortCircuit === true) { meta.shortCircuited = true; }
if (!meta.chainFinished && !meta.shortCircuited) {
throw new ERR_LOADER_CHAIN_INCOMPLETE(hookErrIdentifier);
}
const {
format,
url,
} = resolution;
if (
format != null &&
typeof format !== 'string' // [2]
) {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a string',
hookErrIdentifier,
'format',
format,
);
}
if (typeof url !== 'string') {
// non-strings can be coerced to a url string
// validateString() throws a less-specific error
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a url string',
hookErrIdentifier,
'url',
url,
);
}
// Try to avoid expensive URL instantiation for known-good urls
if (!this.moduleMap.has(url)) {
try {
new URL(url);
} catch {
throw new ERR_INVALID_RETURN_PROPERTY_VALUE(
'a url string',
hookErrIdentifier,
'url',
url,
);
}
}
return {
format,
url,
};
}
}
ObjectSetPrototypeOf(ESMLoader.prototype, null);
exports.ESMLoader = ESMLoader;
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