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'use strict';
const { Object } = primordials;
const { validateString } = require('internal/validators');
const path = require('path');
const { pathToFileURL } = require('internal/url');
const { URL } = require('url');
// Invoke with makeRequireFunction(module) where |module| is the Module object
// to use as the context for the require() function.
function makeRequireFunction(mod) {
const Module = mod.constructor;
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;
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 (content.charCodeAt(0) === 0xFEFF) {
content = content.slice(1);
}
return content;
}
const builtinLibs = [
'assert', 'async_hooks', 'buffer', 'child_process', 'cluster', 'crypto',
'dgram', 'dns', 'domain', 'events', 'fs', 'http', 'http2', 'https', 'net',
'os', 'path', 'perf_hooks', 'punycode', 'querystring', 'readline', 'repl',
'stream', 'string_decoder', 'tls', 'trace_events', 'tty', 'url', 'util',
'v8', 'vm', 'worker_threads', 'zlib'
];
if (typeof internalBinding('inspector').open === 'function') {
builtinLibs.push('inspector');
builtinLibs.sort();
}
function addBuiltinLibsToObject(object) {
// Make built-in modules available directly (loaded lazily).
builtinLibs.forEach((name) => {
// 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;
};
Object.defineProperty(object, name, {
get: () => {
const lib = require(name);
// Disable the current getter/setter and set up a new
// non-enumerable property.
delete object[name];
Object.defineProperty(object, name, {
get: () => lib,
set: setReal,
configurable: true,
enumerable: false
});
return lib;
},
set: setReal,
configurable: true,
enumerable: false
});
});
}
function normalizeReferrerURL(referrer) {
if (typeof referrer === 'string' && path.isAbsolute(referrer)) {
return pathToFileURL(referrer).href;
}
return new URL(referrer).href;
}
module.exports = {
addBuiltinLibsToObject,
builtinLibs,
makeRequireFunction,
normalizeReferrerURL,
stripBOM,
};
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