90 lines
2.7 KiB
JavaScript
90 lines
2.7 KiB
JavaScript
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// Copied from https://github.com/nodejs/node/blob/v17.0.1/lib/internal/modules/cjs/helpers.js
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'use strict';
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const {
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ArrayPrototypeForEach,
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ObjectDefineProperty,
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ObjectPrototypeHasOwnProperty,
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SafeSet,
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StringPrototypeIncludes,
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StringPrototypeStartsWith,
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} = require('./node-primordials');
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const { getOptionValue } = require('./node-options');
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const userConditions = getOptionValue('--conditions');
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const noAddons = getOptionValue('--no-addons');
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const addonConditions = noAddons ? [] : ['node-addons'];
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// TODO: Use this set when resolving pkg#exports conditions in loader.js.
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const cjsConditions = new SafeSet([
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'require',
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'node',
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...addonConditions,
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...userConditions,
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]);
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/**
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* @param {any} object
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* @param {string} [dummyModuleName]
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* @return {void}
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*/
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function addBuiltinLibsToObject(object, dummyModuleName) {
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// Make built-in modules available directly (loaded lazily).
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const Module = require('module').Module;
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const { builtinModules } = Module;
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// To require built-in modules in user-land and ignore modules whose
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// `canBeRequiredByUsers` is false. So we create a dummy module object and not
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// use `require()` directly.
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const dummyModule = new Module(dummyModuleName);
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ArrayPrototypeForEach(builtinModules, (name) => {
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// Neither add underscored modules, nor ones that contain slashes (e.g.,
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// 'fs/promises') or ones that are already defined.
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if (StringPrototypeStartsWith(name, '_') ||
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StringPrototypeIncludes(name, '/') ||
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ObjectPrototypeHasOwnProperty(object, name)) {
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return;
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}
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// Goals of this mechanism are:
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// - Lazy loading of built-in modules
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// - Having all built-in modules available as non-enumerable properties
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// - Allowing the user to re-assign these variables as if there were no
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// pre-existing globals with the same name.
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const setReal = (val) => {
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// Deleting the property before re-assigning it disables the
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// getter/setter mechanism.
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delete object[name];
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object[name] = val;
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};
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ObjectDefineProperty(object, name, {
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get: () => {
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// Node 12 hack; remove when we drop node12 support
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const lib = (dummyModule.require || require)(name);
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// Disable the current getter/setter and set up a new
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// non-enumerable property.
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delete object[name];
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ObjectDefineProperty(object, name, {
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get: () => lib,
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set: setReal,
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configurable: true,
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enumerable: false
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});
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return lib;
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},
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set: setReal,
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configurable: true,
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enumerable: false
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});
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});
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}
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exports.addBuiltinLibsToObject = addBuiltinLibsToObject;
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exports.cjsConditions = cjsConditions;
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