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'use strict';
/* global breakAtBootstrap, primordials */
// This file subclasses and stores the JS builtins that come from the VM
// so that Node.js's builtin modules do not need to later look these up from
// the global proxy, which can be mutated by users.
// TODO(joyeecheung): we can restrict access to these globals in builtin
// modules through the JS linter, for example: ban access such as `Object`
// (which falls back to a lookup in the global proxy) in favor of
// `primordials.Object` where `primordials` is a lexical variable passed
// by the native module compiler.
if (breakAtBootstrap) {
debugger; // eslint-disable-line no-debugger
}
function copyProps(src, dest) {
for (const key of Reflect.ownKeys(src)) {
if (!Reflect.getOwnPropertyDescriptor(dest, key)) {
Reflect.defineProperty(
dest,
key,
Reflect.getOwnPropertyDescriptor(src, key));
}
}
}
function makeSafe(unsafe, safe) {
copyProps(unsafe.prototype, safe.prototype);
copyProps(unsafe, safe);
Object.setPrototypeOf(safe.prototype, null);
Object.freeze(safe.prototype);
Object.freeze(safe);
return safe;
}
// Subclass the constructors because we need to use their prototype
// methods later.
primordials.SafeMap = makeSafe(
Map,
class SafeMap extends Map {}
);
primordials.SafeWeakMap = makeSafe(
WeakMap,
class SafeWeakMap extends WeakMap {}
);
primordials.SafeSet = makeSafe(
Set,
class SafeSet extends Set {}
);
primordials.SafePromise = makeSafe(
Promise,
class SafePromise extends Promise {}
);
// Create copies of the namespace objects
[
'JSON',
'Math',
'Reflect'
].forEach((name) => {
const target = primordials[name] = Object.create(null);
copyProps(global[name], target);
});
// Create copies of intrinsic objects
[
'Array',
'Date',
'Function',
'Object',
'RegExp',
'String',
'Symbol',
].forEach((name) => {
const target = primordials[name] = Object.create(null);
copyProps(global[name], target);
const proto = primordials[name + 'Prototype'] = Object.create(null);
copyProps(global[name].prototype, proto);
});
Object.setPrototypeOf(primordials, null);
Object.freeze(primordials);
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