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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// TODO(petamoriken): enable prefer-primordials for node polyfills
// deno-lint-ignore-file prefer-primordials
import { validateFunction } from "ext:deno_node/internal/validators.mjs";
import {
normalizeEncoding,
slowCases,
} from "ext:deno_node/internal/normalize_encoding.mjs";
export { normalizeEncoding, slowCases };
import {
ObjectCreate,
StringPrototypeToUpperCase,
} from "ext:deno_node/internal/primordials.mjs";
import { ERR_UNKNOWN_SIGNAL } from "ext:deno_node/internal/errors.ts";
import { os } from "ext:deno_node/internal_binding/constants.ts";
import { primordials } from "ext:core/mod.js";
const {
SafeWeakRef,
} = primordials;
export const customInspectSymbol = Symbol.for("nodejs.util.inspect.custom");
export const kEnumerableProperty = Object.create(null);
kEnumerableProperty.enumerable = true;
export const kEmptyObject = Object.freeze(Object.create(null));
export function once(callback) {
let called = false;
return function (...args) {
if (called) return;
called = true;
Reflect.apply(callback, this, args);
};
}
export function createDeferredPromise() {
let resolve;
let reject;
const promise = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
return { promise, resolve, reject };
}
// In addition to being accessible through util.promisify.custom,
// this symbol is registered globally and can be accessed in any environment as
// Symbol.for('nodejs.util.promisify.custom').
const kCustomPromisifiedSymbol = Symbol.for("nodejs.util.promisify.custom");
// This is an internal Node symbol used by functions returning multiple
// arguments, e.g. ['bytesRead', 'buffer'] for fs.read().
const kCustomPromisifyArgsSymbol = Symbol.for(
"nodejs.util.promisify.customArgs",
);
export const customPromisifyArgs = kCustomPromisifyArgsSymbol;
export function promisify(
original,
) {
validateFunction(original, "original");
if (original[kCustomPromisifiedSymbol]) {
const fn = original[kCustomPromisifiedSymbol];
validateFunction(fn, "util.promisify.custom");
return Object.defineProperty(fn, kCustomPromisifiedSymbol, {
value: fn,
enumerable: false,
writable: false,
configurable: true,
});
}
// Names to create an object from in case the callback receives multiple
// arguments, e.g. ['bytesRead', 'buffer'] for fs.read.
const argumentNames = original[kCustomPromisifyArgsSymbol];
function fn(...args) {
return new Promise((resolve, reject) => {
args.push((err, ...values) => {
if (err) {
return reject(err);
}
if (argumentNames !== undefined && values.length > 1) {
const obj = {};
for (let i = 0; i < argumentNames.length; i++) {
obj[argumentNames[i]] = values[i];
}
resolve(obj);
} else {
resolve(values[0]);
}
});
Reflect.apply(original, this, args);
});
}
Object.setPrototypeOf(fn, Object.getPrototypeOf(original));
Object.defineProperty(fn, kCustomPromisifiedSymbol, {
value: fn,
enumerable: false,
writable: false,
configurable: true,
});
return Object.defineProperties(
fn,
Object.getOwnPropertyDescriptors(original),
);
}
let signalsToNamesMapping;
function getSignalsToNamesMapping() {
if (signalsToNamesMapping !== undefined) {
return signalsToNamesMapping;
}
signalsToNamesMapping = ObjectCreate(null);
for (const key in os.signals) {
signalsToNamesMapping[os.signals[key]] = key;
}
return signalsToNamesMapping;
}
export function convertToValidSignal(signal) {
if (typeof signal === "number" && getSignalsToNamesMapping()[signal]) {
return signal;
}
if (typeof signal === "string") {
const signalName = os.signals[StringPrototypeToUpperCase(signal)];
if (signalName) return signalName;
}
throw new ERR_UNKNOWN_SIGNAL(signal);
}
export class WeakReference {
#weak = null;
#strong = null;
#refCount = 0;
constructor(object) {
this.#weak = new SafeWeakRef(object);
}
incRef() {
this.#refCount++;
if (this.#refCount === 1) {
const derefed = this.#weak.deref();
if (derefed !== undefined) {
this.#strong = derefed;
}
}
return this.#refCount;
}
decRef() {
this.#refCount--;
if (this.#refCount === 0) {
this.#strong = null;
}
return this.#refCount;
}
get() {
return this.#weak.deref();
}
}
promisify.custom = kCustomPromisifiedSymbol;
export default {
convertToValidSignal,
createDeferredPromise,
customInspectSymbol,
customPromisifyArgs,
kEmptyObject,
kEnumerableProperty,
normalizeEncoding,
once,
promisify,
slowCases,
};
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