51 lines
1.8 KiB
JavaScript
51 lines
1.8 KiB
JavaScript
const {ArrayPrototypeForEach, StringPrototypeStartsWith, ObjectPrototypeHasOwnProperty, StringPrototypeIncludes, ObjectDefineProperty} = require('./node-primordials');
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exports.addBuiltinLibsToObject = addBuiltinLibsToObject;
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// Copied from https://github.com/nodejs/node/blob/21f5a56914a3b24ad77535ef369b93c6b1c11d18/lib/internal/modules/cjs/helpers.js#L133-L178
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function addBuiltinLibsToObject(object) {
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// Make built-in modules available directly (loaded lazily).
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const { builtinModules } = require('module').Module;
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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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const lib = 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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