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denoland-deno/runtime/js/06_util.js
2024-01-10 15:37:25 -07:00

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1.6 KiB
JavaScript

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { core, primordials } from "ext:core/mod.js";
const {
op_bootstrap_log_level,
} = core.ensureFastOps();
const {
Promise,
SafeArrayIterator,
} = primordials;
// WARNING: Keep this in sync with Rust (search for LogLevel)
const LogLevel = {
Error: 1,
Warn: 2,
Info: 3,
Debug: 4,
};
const logSource = "JS";
let logLevel_ = null;
function logLevel() {
if (logLevel_ === null) {
logLevel_ = op_bootstrap_log_level() || 3;
}
return logLevel_;
}
function log(...args) {
if (logLevel() >= LogLevel.Debug) {
// if we destructure `console` off `globalThis` too early, we don't bind to
// the right console, therefore we don't log anything out.
globalThis.console.error(
`DEBUG ${logSource} -`,
...new SafeArrayIterator(args),
);
}
}
function createResolvable() {
let resolve;
let reject;
const promise = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
promise.resolve = resolve;
promise.reject = reject;
return promise;
}
function writable(value) {
return {
value,
writable: true,
enumerable: true,
configurable: true,
};
}
function nonEnumerable(value) {
return {
value,
writable: true,
enumerable: false,
configurable: true,
};
}
function readOnly(value) {
return {
value,
enumerable: true,
writable: false,
configurable: true,
};
}
function getterOnly(getter) {
return {
get: getter,
set() {},
enumerable: true,
configurable: true,
};
}
export { createResolvable, getterOnly, log, nonEnumerable, readOnly, writable };