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const {
ArrayIsArray,
ObjectCreate,
} = primordials;
const {
ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING,
} = require('internal/errors').codes;
const { ESMLoader } = require('internal/modules/esm/loader');
const {
hasUncaughtExceptionCaptureCallback,
} = require('internal/process/execution');
const { pathToFileURL } = require('internal/url');
const {
getModuleFromWrap,
} = require('internal/vm/module');
exports.initializeImportMetaObject = function(wrap, meta) {
const { callbackMap } = internalBinding('module_wrap');
if (callbackMap.has(wrap)) {
const { initializeImportMeta } = callbackMap.get(wrap);
if (initializeImportMeta !== undefined) {
initializeImportMeta(meta, getModuleFromWrap(wrap) || wrap);
}
}
};
exports.importModuleDynamicallyCallback =
async function importModuleDynamicallyCallback(wrap, specifier, assertions) {
const { callbackMap } = internalBinding('module_wrap');
if (callbackMap.has(wrap)) {
const { importModuleDynamically } = callbackMap.get(wrap);
if (importModuleDynamically !== undefined) {
return importModuleDynamically(
specifier, getModuleFromWrap(wrap) || wrap, assertions);
}
}
throw new ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING();
};
const esmLoader = new ESMLoader();
exports.esmLoader = esmLoader;
// Module.runMain() causes loadESM() to re-run (which it should do); however, this should NOT cause
// ESM to be re-initialised; doing so causes duplicate custom loaders to be added to the public
// esmLoader.
let isESMInitialized = false;
/**
* Causes side-effects: user-defined loader hooks are added to esmLoader.
* @returns {void}
*/
async function initializeLoader() {
if (isESMInitialized) { return; }
const { getOptionValue } = require('internal/options');
const customLoaders = getOptionValue('--experimental-loader');
const preloadModules = getOptionValue('--import');
const loaders = await loadModulesInIsolation(customLoaders);
// Hooks must then be added to external/public loader
// (so they're triggered in userland)
esmLoader.addCustomLoaders(loaders);
// Preload after loaders are added so they can be used
if (preloadModules?.length) {
await loadModulesInIsolation(preloadModules, loaders);
}
isESMInitialized = true;
}
function loadModulesInIsolation(specifiers, loaders = []) {
if (!ArrayIsArray(specifiers) || specifiers.length === 0) { return; }
let cwd;
try {
cwd = process.cwd() + '/';
} catch {
cwd = 'file:///';
}
// A separate loader instance is necessary to avoid cross-contamination
// between internal Node.js and userland. For example, a module with internal
// state (such as a counter) should be independent.
const internalEsmLoader = new ESMLoader();
internalEsmLoader.addCustomLoaders(loaders);
// Importation must be handled by internal loader to avoid poluting userland
return internalEsmLoader.import(
specifiers,
pathToFileURL(cwd).href,
ObjectCreate(null),
);
}
exports.loadESM = async function loadESM(callback) {
try {
await initializeLoader();
await callback(esmLoader);
} catch (err) {
if (hasUncaughtExceptionCaptureCallback()) {
process._fatalException(err);
return;
}
internalBinding('errors').triggerUncaughtException(
err,
true /* fromPromise */
);
}
};
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