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const {
ArrayPrototypeForEach,
ArrayPrototypeJoin,
ArrayPrototypeSome,
ObjectDefineProperty,
ObjectPrototypeHasOwnProperty,
SafeMap,
SafeSet,
StringPrototypeCharCodeAt,
StringPrototypeIncludes,
StringPrototypeSlice,
StringPrototypeStartsWith,
} = primordials;
const {
ERR_MANIFEST_DEPENDENCY_MISSING,
ERR_UNKNOWN_BUILTIN_MODULE
} = require('internal/errors').codes;
const { BuiltinModule } = require('internal/bootstrap/loaders');
const { validateString } = require('internal/validators');
const path = require('path');
const { pathToFileURL, fileURLToPath, URL } = require('internal/url');
const { getOptionValue } = require('internal/options');
const { setOwnProperty } = require('internal/util');
const userConditions = getOptionValue('--conditions');
let debug = require('internal/util/debuglog').debuglog('module', (fn) => {
debug = fn;
});
const noAddons = getOptionValue('--no-addons');
const addonConditions = noAddons ? [] : ['node-addons'];
// TODO: Use this set when resolving pkg#exports conditions in loader.js.
const cjsConditions = new SafeSet([
'require',
'node',
...addonConditions,
...userConditions,
]);
function loadBuiltinModule(filename, request) {
const mod = BuiltinModule.map.get(filename);
if (mod?.canBeRequiredByUsers) {
debug('load built-in module %s', request);
// compileForPublicLoader() throws if mod.canBeRequiredByUsers is false:
mod.compileForPublicLoader();
return mod;
}
}
// Invoke with makeRequireFunction(module) where |module| is the Module object
// to use as the context for the require() function.
// Use redirects to set up a mapping from a policy and restrict dependencies
const urlToFileCache = new SafeMap();
function makeRequireFunction(mod, redirects) {
const Module = mod.constructor;
let require;
if (redirects) {
const id = mod.filename || mod.id;
const conditions = cjsConditions;
const { resolve, reaction } = redirects;
require = function require(specifier) {
let missing = true;
const destination = resolve(specifier, conditions);
if (destination === true) {
missing = false;
} else if (destination) {
const href = destination.href;
if (destination.protocol === 'node:') {
const specifier = destination.pathname;
const mod = loadBuiltinModule(specifier, href);
if (mod && mod.canBeRequiredByUsers) {
return mod.exports;
}
throw new ERR_UNKNOWN_BUILTIN_MODULE(specifier);
} else if (destination.protocol === 'file:') {
let filepath;
if (urlToFileCache.has(href)) {
filepath = urlToFileCache.get(href);
} else {
filepath = fileURLToPath(destination);
urlToFileCache.set(href, filepath);
}
return mod.require(filepath);
}
}
if (missing) {
reaction(new ERR_MANIFEST_DEPENDENCY_MISSING(
id,
specifier,
ArrayPrototypeJoin([...conditions], ', ')
));
}
return mod.require(specifier);
};
} else {
require = function require(path) {
return mod.require(path);
};
}
function resolve(request, options) {
validateString(request, 'request');
return Module._resolveFilename(request, mod, false, options);
}
require.resolve = resolve;
function paths(request) {
validateString(request, 'request');
return Module._resolveLookupPaths(request, mod);
}
resolve.paths = paths;
setOwnProperty(require, 'main', process.mainModule);
// Enable support to add extra extension types.
require.extensions = Module._extensions;
require.cache = Module._cache;
return require;
}
/**
* Remove byte order marker. This catches EF BB BF (the UTF-8 BOM)
* because the buffer-to-string conversion in `fs.readFileSync()`
* translates it to FEFF, the UTF-16 BOM.
*/
function stripBOM(content) {
if (StringPrototypeCharCodeAt(content) === 0xFEFF) {
content = StringPrototypeSlice(content, 1);
}
return content;
}
function addBuiltinLibsToObject(object, dummyModuleName) {
// Make built-in modules available directly (loaded lazily).
const Module = require('internal/modules/cjs/loader').Module;
const { builtinModules } = Module;
// To require built-in modules in user-land and ignore modules whose
// `canBeRequiredByUsers` is false. So we create a dummy module object and not
// use `require()` directly.
const dummyModule = new Module(dummyModuleName);
ArrayPrototypeForEach(builtinModules, (name) => {
// Neither add underscored modules, nor ones that contain slashes (e.g.,
// 'fs/promises') or ones that are already defined.
if (StringPrototypeStartsWith(name, '_') ||
StringPrototypeIncludes(name, '/') ||
ObjectPrototypeHasOwnProperty(object, name)) {
return;
}
// Goals of this mechanism are:
// - Lazy loading of built-in modules
// - Having all built-in modules available as non-enumerable properties
// - Allowing the user to re-assign these variables as if there were no
// pre-existing globals with the same name.
const setReal = (val) => {
// Deleting the property before re-assigning it disables the
// getter/setter mechanism.
delete object[name];
object[name] = val;
};
ObjectDefineProperty(object, name, {
__proto__: null,
get: () => {
const lib = dummyModule.require(name);
// Disable the current getter/setter and set up a new
// non-enumerable property.
delete object[name];
ObjectDefineProperty(object, name, {
__proto__: null,
get: () => lib,
set: setReal,
configurable: true,
enumerable: false
});
return lib;
},
set: setReal,
configurable: true,
enumerable: false
});
});
}
/**
*
* @param {string | URL} referrer
* @returns {string}
*/
function normalizeReferrerURL(referrer) {
if (typeof referrer === 'string' && path.isAbsolute(referrer)) {
return pathToFileURL(referrer).href;
}
return new URL(referrer).href;
}
// For error messages only - used to check if ESM syntax is in use.
function hasEsmSyntax(code) {
debug('Checking for ESM syntax');
const parser = require('internal/deps/acorn/acorn/dist/acorn').Parser;
let root;
try {
root = parser.parse(code, { sourceType: 'module', ecmaVersion: 'latest' });
} catch {
return false;
}
return ArrayPrototypeSome(root.body, (stmt) =>
stmt.type === 'ExportDefaultDeclaration' ||
stmt.type === 'ExportNamedDeclaration' ||
stmt.type === 'ImportDeclaration' ||
stmt.type === 'ExportAllDeclaration');
}
module.exports = {
addBuiltinLibsToObject,
cjsConditions,
hasEsmSyntax,
loadBuiltinModule,
makeRequireFunction,
normalizeReferrerURL,
stripBOM,
};
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