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denoland-deno/runtime/js/06_util.js

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JavaScript

// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { primordials } from "ext:core/mod.js";
import { op_bootstrap_log_level } from "ext:core/ops";
const { 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),
);
}
}
export { log };