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/* eslint-disable node-core/prefer-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.
// Use of primordials have sometimes a dramatic impact on performance, please
// benchmark all changes made in performance-sensitive areas of the codebase.
// See: https://github.com/nodejs/node/pull/38248
const {
defineProperty: ReflectDefineProperty,
getOwnPropertyDescriptor: ReflectGetOwnPropertyDescriptor,
ownKeys: ReflectOwnKeys,
} = Reflect;
// `uncurryThis` is equivalent to `func => Function.prototype.call.bind(func)`.
// It is using `bind.bind(call)` to avoid using `Function.prototype.bind`
// and `Function.prototype.call` after it may have been mutated by users.
const { apply, bind, call } = Function.prototype;
const uncurryThis = bind.bind(call);
primordials.uncurryThis = uncurryThis;
// `applyBind` is equivalent to `func => Function.prototype.apply.bind(func)`.
// It is using `bind.bind(apply)` to avoid using `Function.prototype.bind`
// and `Function.prototype.apply` after it may have been mutated by users.
const applyBind = bind.bind(apply);
primordials.applyBind = applyBind;
// Methods that accept a variable number of arguments, and thus it's useful to
// also create `${prefix}${key}Apply`, which uses `Function.prototype.apply`,
// instead of `Function.prototype.call`, and thus doesn't require iterator
// destructuring.
const varargsMethods = [
// 'ArrayPrototypeConcat' is omitted, because it performs the spread
// on its own for arrays and array-likes with a truthy
// @@isConcatSpreadable symbol property.
'ArrayOf',
'ArrayPrototypePush',
'ArrayPrototypeUnshift',
// 'FunctionPrototypeCall' is omitted, since there's 'ReflectApply'
// and 'FunctionPrototypeApply'.
'MathHypot',
'MathMax',
'MathMin',
'StringPrototypeConcat',
'TypedArrayOf',
];
function getNewKey(key) {
return typeof key === 'symbol' ?
`Symbol${key.description[7].toUpperCase()}${key.description.slice(8)}` :
`${key[0].toUpperCase()}${key.slice(1)}`;
}
function copyAccessor(dest, prefix, key, { enumerable, get, set }) {
ReflectDefineProperty(dest, `${prefix}Get${key}`, {
__proto__: null,
value: uncurryThis(get),
enumerable
});
if (set !== undefined) {
ReflectDefineProperty(dest, `${prefix}Set${key}`, {
__proto__: null,
value: uncurryThis(set),
enumerable
});
}
}
function copyPropsRenamed(src, dest, prefix) {
for (const key of ReflectOwnKeys(src)) {
const newKey = getNewKey(key);
const desc = ReflectGetOwnPropertyDescriptor(src, key);
if ('get' in desc) {
copyAccessor(dest, prefix, newKey, desc);
} else {
const name = `${prefix}${newKey}`;
ReflectDefineProperty(dest, name, { __proto__: null, ...desc });
if (varargsMethods.includes(name)) {
ReflectDefineProperty(dest, `${name}Apply`, {
__proto__: null,
// `src` is bound as the `this` so that the static `this` points
// to the object it was defined on,
// e.g.: `ArrayOfApply` gets a `this` of `Array`:
value: applyBind(desc.value, src),
});
}
}
}
}
function copyPropsRenamedBound(src, dest, prefix) {
for (const key of ReflectOwnKeys(src)) {
const newKey = getNewKey(key);
const desc = ReflectGetOwnPropertyDescriptor(src, key);
if ('get' in desc) {
copyAccessor(dest, prefix, newKey, desc);
} else {
const { value } = desc;
if (typeof value === 'function') {
desc.value = value.bind(src);
}
const name = `${prefix}${newKey}`;
ReflectDefineProperty(dest, name, { __proto__: null, ...desc });
if (varargsMethods.includes(name)) {
ReflectDefineProperty(dest, `${name}Apply`, {
__proto__: null,
value: applyBind(value, src),
});
}
}
}
}
function copyPrototype(src, dest, prefix) {
for (const key of ReflectOwnKeys(src)) {
const newKey = getNewKey(key);
const desc = ReflectGetOwnPropertyDescriptor(src, key);
if ('get' in desc) {
copyAccessor(dest, prefix, newKey, desc);
} else {
const { value } = desc;
if (typeof value === 'function') {
desc.value = uncurryThis(value);
}
const name = `${prefix}${newKey}`;
ReflectDefineProperty(dest, name, { __proto__: null, ...desc });
if (varargsMethods.includes(name)) {
ReflectDefineProperty(dest, `${name}Apply`, {
__proto__: null,
value: applyBind(value),
});
}
}
}
}
// Create copies of configurable value properties of the global object
[
'Proxy',
'globalThis',
].forEach((name) => {
// eslint-disable-next-line no-restricted-globals
primordials[name] = globalThis[name];
});
// Create copies of URI handling functions
[
decodeURI,
decodeURIComponent,
encodeURI,
encodeURIComponent,
].forEach((fn) => {
primordials[fn.name] = fn;
});
// Create copies of legacy functions
[
escape,
eval,
unescape,
].forEach((fn) => {
primordials[fn.name] = fn;
});
// Create copies of the namespace objects
[
'JSON',
'Math',
'Proxy',
'Reflect',
].forEach((name) => {
// eslint-disable-next-line no-restricted-globals
copyPropsRenamed(globalThis[name], primordials, name);
});
// Create copies of intrinsic objects
[
'AggregateError',
'Array',
'ArrayBuffer',
'BigInt',
'BigInt64Array',
'BigUint64Array',
'Boolean',
'DataView',
'Date',
'Error',
'EvalError',
'FinalizationRegistry',
'Float32Array',
'Float64Array',
'Function',
'Int16Array',
'Int32Array',
'Int8Array',
'Map',
'Number',
'Object',
'RangeError',
'ReferenceError',
'RegExp',
'Set',
'String',
'Symbol',
'SyntaxError',
'TypeError',
'URIError',
'Uint16Array',
'Uint32Array',
'Uint8Array',
'Uint8ClampedArray',
'WeakMap',
'WeakRef',
'WeakSet',
].forEach((name) => {
// eslint-disable-next-line no-restricted-globals
const original = globalThis[name];
primordials[name] = original;
copyPropsRenamed(original, primordials, name);
copyPrototype(original.prototype, primordials, `${name}Prototype`);
});
// Create copies of intrinsic objects that require a valid `this` to call
// static methods.
// Refs: https://www.ecma-international.org/ecma-262/#sec-promise.all
[
'Promise',
].forEach((name) => {
// eslint-disable-next-line no-restricted-globals
const original = globalThis[name];
primordials[name] = original;
copyPropsRenamedBound(original, primordials, name);
copyPrototype(original.prototype, primordials, `${name}Prototype`);
});
// Create copies of abstract intrinsic objects that are not directly exposed
// on the global object.
// Refs: https://tc39.es/ecma262/#sec-%typedarray%-intrinsic-object
[
{ name: 'TypedArray', original: Reflect.getPrototypeOf(Uint8Array) },
{ name: 'ArrayIterator', original: {
prototype: Reflect.getPrototypeOf(Array.prototype[Symbol.iterator]()),
} },
{ name: 'StringIterator', original: {
prototype: Reflect.getPrototypeOf(String.prototype[Symbol.iterator]()),
} },
].forEach(({ name, original }) => {
primordials[name] = original;
// The static %TypedArray% methods require a valid `this`, but can't be bound,
// as they need a subclass constructor as the receiver:
copyPrototype(original, primordials, name);
copyPrototype(original.prototype, primordials, `${name}Prototype`);
});
/* eslint-enable node-core/prefer-primordials */
const {
ArrayPrototypeForEach,
ArrayPrototypeMap,
FinalizationRegistry,
FunctionPrototypeCall,
Map,
ObjectFreeze,
ObjectSetPrototypeOf,
Promise,
PromisePrototypeThen,
Set,
SymbolIterator,
WeakMap,
WeakRef,
WeakSet,
} = primordials;
// Because these functions are used by `makeSafe`, which is exposed
// on the `primordials` object, it's important to use const references
// to the primordials that they use:
const createSafeIterator = (factory, next) => {
class SafeIterator {
constructor(iterable) {
this._iterator = factory(iterable);
}
next() {
return next(this._iterator);
}
[SymbolIterator]() {
return this;
}
}
ObjectSetPrototypeOf(SafeIterator.prototype, null);
ObjectFreeze(SafeIterator.prototype);
ObjectFreeze(SafeIterator);
return SafeIterator;
};
primordials.SafeArrayIterator = createSafeIterator(
primordials.ArrayPrototypeSymbolIterator,
primordials.ArrayIteratorPrototypeNext
);
primordials.SafeStringIterator = createSafeIterator(
primordials.StringPrototypeSymbolIterator,
primordials.StringIteratorPrototypeNext
);
const copyProps = (src, dest) => {
ArrayPrototypeForEach(ReflectOwnKeys(src), (key) => {
if (!ReflectGetOwnPropertyDescriptor(dest, key)) {
ReflectDefineProperty(
dest,
key,
{ __proto__: null, ...ReflectGetOwnPropertyDescriptor(src, key) });
}
});
};
/**
* @type {typeof primordials.makeSafe}
*/
const makeSafe = (unsafe, safe) => {
if (SymbolIterator in unsafe.prototype) {
const dummy = new unsafe();
let next; // We can reuse the same `next` method.
ArrayPrototypeForEach(ReflectOwnKeys(unsafe.prototype), (key) => {
if (!ReflectGetOwnPropertyDescriptor(safe.prototype, key)) {
const desc = ReflectGetOwnPropertyDescriptor(unsafe.prototype, key);
if (
typeof desc.value === 'function' &&
desc.value.length === 0 &&
SymbolIterator in (FunctionPrototypeCall(desc.value, dummy) ?? {})
) {
const createIterator = uncurryThis(desc.value);
next ??= uncurryThis(createIterator(dummy).next);
const SafeIterator = createSafeIterator(createIterator, next);
desc.value = function() {
return new SafeIterator(this);
};
}
ReflectDefineProperty(safe.prototype, key, { __proto__: null, ...desc });
}
});
} else {
copyProps(unsafe.prototype, safe.prototype);
}
copyProps(unsafe, safe);
ObjectSetPrototypeOf(safe.prototype, null);
ObjectFreeze(safe.prototype);
ObjectFreeze(safe);
return safe;
};
primordials.makeSafe = makeSafe;
// Subclass the constructors because we need to use their prototype
// methods later.
// Defining the `constructor` is necessary here to avoid the default
// constructor which uses the user-mutable `%ArrayIteratorPrototype%.next`.
primordials.SafeMap = makeSafe(
Map,
class SafeMap extends Map {
constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
}
);
primordials.SafeWeakMap = makeSafe(
WeakMap,
class SafeWeakMap extends WeakMap {
constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
}
);
primordials.SafeSet = makeSafe(
Set,
class SafeSet extends Set {
constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
}
);
primordials.SafeWeakSet = makeSafe(
WeakSet,
class SafeWeakSet extends WeakSet {
constructor(i) { super(i); } // eslint-disable-line no-useless-constructor
}
);
primordials.SafeFinalizationRegistry = makeSafe(
FinalizationRegistry,
class SafeFinalizationRegistry extends FinalizationRegistry {
// eslint-disable-next-line no-useless-constructor
constructor(cleanupCallback) { super(cleanupCallback); }
}
);
primordials.SafeWeakRef = makeSafe(
WeakRef,
class SafeWeakRef extends WeakRef {
// eslint-disable-next-line no-useless-constructor
constructor(target) { super(target); }
}
);
const SafePromise = makeSafe(
Promise,
class SafePromise extends Promise {
// eslint-disable-next-line no-useless-constructor
constructor(executor) { super(executor); }
}
);
/**
* Attaches a callback that is invoked when the Promise is settled (fulfilled or
* rejected). The resolved value cannot be modified from the callback.
* Prefer using async functions when possible.
* @param {Promise<any>} thisPromise
* @param {() => void) | undefined | null} onFinally The callback to execute
* when the Promise is settled (fulfilled or rejected).
* @returns {Promise} A Promise for the completion of the callback.
*/
primordials.SafePromisePrototypeFinally = (thisPromise, onFinally) =>
// Wrapping on a new Promise is necessary to not expose the SafePromise
// prototype to user-land.
new Promise((a, b) =>
new SafePromise((a, b) => PromisePrototypeThen(thisPromise, a, b))
.finally(onFinally)
.then(a, b)
);
primordials.AsyncIteratorPrototype =
primordials.ReflectGetPrototypeOf(
primordials.ReflectGetPrototypeOf(
async function* () {}).prototype);
const arrayToSafePromiseIterable = (promises, mapFn) =>
new primordials.SafeArrayIterator(
ArrayPrototypeMap(
promises,
(promise, i) =>
new SafePromise((a, b) => PromisePrototypeThen(mapFn == null ? promise : mapFn(promise, i), a, b))
)
);
/**
* @param {Promise<any>[]} promises
* @param {(v: Promise<any>, k: number) => Promise<any>} [mapFn]
* @returns {Promise<any[]>}
*/
primordials.SafePromiseAll = (promises, mapFn) =>
// Wrapping on a new Promise is necessary to not expose the SafePromise
// prototype to user-land.
new Promise((a, b) =>
SafePromise.all(arrayToSafePromiseIterable(promises, mapFn)).then(a, b)
);
/**
* @param {Promise<any>[]} promises
* @param {(v: Promise<any>, k: number) => Promise<any>} [mapFn]
* @returns {Promise<PromiseSettledResult<any>[]>}
*/
primordials.SafePromiseAllSettled = (promises, mapFn) =>
// Wrapping on a new Promise is necessary to not expose the SafePromise
// prototype to user-land.
new Promise((a, b) =>
SafePromise.allSettled(arrayToSafePromiseIterable(promises, mapFn)).then(a, b)
);
/**
* @param {Promise<any>[]} promises
* @param {(v: Promise<any>, k: number) => Promise<any>} [mapFn]
* @returns {Promise<any>}
*/
primordials.SafePromiseAny = (promises, mapFn) =>
// Wrapping on a new Promise is necessary to not expose the SafePromise
// prototype to user-land.
new Promise((a, b) =>
SafePromise.any(arrayToSafePromiseIterable(promises, mapFn)).then(a, b)
);
/**
* @param {Promise<any>[]} promises
* @param {(v: Promise<any>, k: number) => Promise<any>} [mapFn]
* @returns {Promise<any>}
*/
primordials.SafePromiseRace = (promises, mapFn) =>
// Wrapping on a new Promise is necessary to not expose the SafePromise
// prototype to user-land.
new Promise((a, b) =>
SafePromise.race(arrayToSafePromiseIterable(promises, mapFn)).then(a, b)
);
ObjectSetPrototypeOf(primordials, null);
ObjectFreeze(primordials);
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