nodejs/doc/api/globals.md

# Global Objects

<!--introduced_in=v0.10.0-->
<!-- type=misc -->

These objects are available in all modules. The following variables may appear
to be global but are not. They exist only in the scope of modules, see the
[module system documentation][]:

* [`__dirname`][]
* [`__filename`][]
* [`exports`][]
* [`module`][]
* [`require()`][]

The objects listed here are specific to Node.js. There are [built-in objects][]
that are part of the JavaScript language itself, which are also globally
accessible.

## Class: `Buffer`
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added: v0.1.103
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<!-- type=global -->

* {Function}

Used to handle binary data. See the [buffer section][].

## `__dirname`

This variable may appear to be global but is not. See [`__dirname`][].

## `__filename`

This variable may appear to be global but is not. See [`__filename`][].

## `clearImmediate(immediateObject)`
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added: v0.9.1
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<!--type=global-->

[`clearImmediate`][] is described in the [timers][] section.

## `clearInterval(intervalObject)`
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added: v0.0.1
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<!--type=global-->

[`clearInterval`][] is described in the [timers][] section.

## `clearTimeout(timeoutObject)`
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added: v0.0.1
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<!--type=global-->

[`clearTimeout`][] is described in the [timers][] section.

## `console`
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added: v0.1.100
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<!-- type=global -->

* {Object}

Used to print to stdout and stderr. See the [`console`][] section.

## `exports`

This variable may appear to be global but is not. See [`exports`][].

## `global`
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added: v0.1.27
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<!-- type=global -->

* {Object} The global namespace object.

In browsers, the top-level scope is the global scope. This means that
within the browser `var something` will define a new global variable. In
Node.js this is different. The top-level scope is not the global scope;
`var something` inside a Node.js module will be local to that module.

## `module`

This variable may appear to be global but is not. See [`module`][].

## `process`
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added: v0.1.7
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<!-- type=global -->

* {Object}

The process object. See the [`process` object][] section.

## `queueMicrotask(callback)`
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<!-- type=global -->

* `callback` {Function} Function to be queued.

The `queueMicrotask()` method queues a microtask to invoke `callback`. If
`callback` throws an exception, the [`process` object][] `'uncaughtException'`
event will be emitted.

The microtask queue is managed by V8 and may be used in a similar manner to
the [`process.nextTick()`][] queue, which is managed by Node.js. The
`process.nextTick()` queue is always processed before the microtask queue
within each turn of the Node.js event loop.

```js
// Here, `queueMicrotask()` is used to ensure the 'load' event is always
// emitted asynchronously, and therefore consistently. Using
// `process.nextTick()` here would result in the 'load' event always emitting
// before any other promise jobs.

DataHandler.prototype.load = async function load(key) {
  const hit = this._cache.get(url);
  if (hit !== undefined) {
    queueMicrotask(() => {
      this.emit('load', hit);
    });
    return;
  }

  const data = await fetchData(key);
  this._cache.set(url, data);
  this.emit('load', data);
};
```

## `require()`

This variable may appear to be global but is not. See [`require()`][].

## `setImmediate(callback[, ...args])`
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added: v0.9.1
-->

<!-- type=global -->

[`setImmediate`][] is described in the [timers][] section.

## `setInterval(callback, delay[, ...args])`
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added: v0.0.1
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<!-- type=global -->

[`setInterval`][] is described in the [timers][] section.

## `setTimeout(callback, delay[, ...args])`
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added: v0.0.1
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<!-- type=global -->

[`setTimeout`][] is described in the [timers][] section.

## `TextDecoder`
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added: v11.0.0
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<!-- type=global -->

The WHATWG `TextDecoder` class. See the [`TextDecoder`][] section.

## `TextEncoder`
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added: v11.0.0
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<!-- type=global -->

The WHATWG `TextEncoder` class. See the [`TextEncoder`][] section.

## `URL`
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added: v10.0.0
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<!-- type=global -->

The WHATWG `URL` class. See the [`URL`][] section.

## `URLSearchParams`
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added: v10.0.0
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<!-- type=global -->

The WHATWG `URLSearchParams` class. See the [`URLSearchParams`][] section.

## `WebAssembly`
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added: v8.0.0
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<!-- type=global -->

* {Object}

The object that acts as the namespace for all W3C
[WebAssembly][webassembly-org] related functionality. See the
[Mozilla Developer Network][webassembly-mdn] for usage and compatibility.

[`TextDecoder`]: util.html#util_class_util_textdecoder
[`TextEncoder`]: util.html#util_class_util_textencoder
[`URLSearchParams`]: url.html#url_class_urlsearchparams
[`URL`]: url.html#url_class_url
[`__dirname`]: modules.html#modules_dirname
[`__filename`]: modules.html#modules_filename
[`clearImmediate`]: timers.html#timers_clearimmediate_immediate
[`clearInterval`]: timers.html#timers_clearinterval_timeout
[`clearTimeout`]: timers.html#timers_cleartimeout_timeout
[`console`]: console.html
[`exports`]: modules.html#modules_exports
[`module`]: modules.html#modules_module
[`process.nextTick()`]: process.html#process_process_nexttick_callback_args
[`process` object]: process.html#process_process
[`require()`]: modules.html#modules_require_id
[`setImmediate`]: timers.html#timers_setimmediate_callback_args
[`setInterval`]: timers.html#timers_setinterval_callback_delay_args
[`setTimeout`]: timers.html#timers_settimeout_callback_delay_args
[buffer section]: buffer.html
[built-in objects]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
[module system documentation]: modules.html
[timers]: timers.html
[webassembly-mdn]: https://developer.mozilla.org/en-US/docs/WebAssembly
[webassembly-org]: https://webassembly.org