FM / api

/usr/share/doc/nodejs/api

Name	Size	Mode	Actions
assets/	-	0755	rm
addons.html	85172	0644	edit dl rm
addons.json.gz	11188	0644	edit dl rm
addons.md	41013	0644	edit dl rm
all.html	4598048	0644	edit dl rm
all.json.gz	681643	0644	edit dl rm
assert.html	110665	0644	edit dl rm
assert.json.gz	12007	0644	edit dl rm
assert.md	47147	0644	edit dl rm
async_hooks.html	83599	0644	edit dl rm
async_hooks.json.gz	14085	0644	edit dl rm
async_hooks.md	38888	0644	edit dl rm
buffer.html	245762	0644	edit dl rm
buffer.json.gz	24105	0644	edit dl rm
buffer.md	105044	0644	edit dl rm
child_process.html	136767	0644	edit dl rm
child_process.json.gz	19399	0644	edit dl rm
child_process.md	62919	0644	edit dl rm
cli.html	87936	0644	edit dl rm
cli.json.gz	16615	0644	edit dl rm
cli.md	42263	0644	edit dl rm
cluster.html	60116	0644	edit dl rm
cluster.json.gz	9557	0644	edit dl rm
cluster.md	25426	0644	edit dl rm
console.html	46093	0644	edit dl rm
console.json.gz	6056	0644	edit dl rm
console.md	16431	0644	edit dl rm
crypto.html	283043	0644	edit dl rm
crypto.json.gz	32118	0644	edit dl rm
crypto.md	125198	0644	edit dl rm
debugger.html	18089	0644	edit dl rm
debugger.json.gz	2820	0644	edit dl rm
debugger.md	6133	0644	edit dl rm
deprecations.html	138537	0644	edit dl rm
deprecations.json.gz	18470	0644	edit dl rm
deprecations.md	79120	0644	edit dl rm
dgram.html	62425	0644	edit dl rm
dgram.json.gz	9630	0644	edit dl rm
dgram.md	27746	0644	edit dl rm
dns.html	98289	0644	edit dl rm
dns.json.gz	13838	0644	edit dl rm
dns.md	40799	0644	edit dl rm
documentation.html	10978	0644	edit dl rm
documentation.json	3328	0644	edit dl rm
documentation.md	2247	0644	edit dl rm
domain.html	36301	0644	edit dl rm
domain.json.gz	6355	0644	edit dl rm
domain.md	15521	0644	edit dl rm
embedding.html	18165	0644	edit dl rm
embedding.json.gz	3625	0644	edit dl rm
embedding.md	8811	0644	edit dl rm
errors.html	182982	0644	edit dl rm
errors.json.gz	36479	0644	edit dl rm
errors.md	81734	0644	edit dl rm
esm.html	92490	0644	edit dl rm
esm.json.gz	15054	0644	edit dl rm
esm.md	48466	0644	edit dl rm
events.html	75986	0644	edit dl rm
events.json.gz	9561	0644	edit dl rm
events.md	28823	0644	edit dl rm
fs.html	437179	0644	edit dl rm
fs.json.gz	47095	0644	edit dl rm
fs.md	187735	0644	edit dl rm
globals.html	19795	0644	edit dl rm
globals.json.gz	2525	0644	edit dl rm
globals.md	5838	0644	edit dl rm
http.html	164378	0644	edit dl rm
http.json.gz	25888	0644	edit dl rm
http.md	74465	0644	edit dl rm
http2.html	256451	0644	edit dl rm
http2.json.gz	37157	0644	edit dl rm
http2.md	121722	0644	edit dl rm
https.html	38345	0644	edit dl rm
https.json.gz	4847	0644	edit dl rm
https.md	13942	0644	edit dl rm
index.html	10087	0644	edit dl rm
index.json	54	0644	edit dl rm
index.md	1825	0644	edit dl rm
inspector.html	22433	0644	edit dl rm
inspector.json.gz	3338	0644	edit dl rm
inspector.md	6825	0644	edit dl rm
intl.html	23154	0644	edit dl rm
intl.json.gz	4038	0644	edit dl rm
intl.md	11092	0644	edit dl rm
module.html	21739	0644	edit dl rm
module.json.gz	2821	0644	edit dl rm
module.md	5341	0644	edit dl rm
modules.html	61333	0644	edit dl rm
modules.json.gz	11897	0644	edit dl rm
modules.md	30610	0644	edit dl rm
n-api.html	340382	0644	edit dl rm
n-api.json.gz	48682	0644	edit dl rm
n-api.md	206268	0644	edit dl rm
net.html	95113	0644	edit dl rm
net.json.gz	14265	0644	edit dl rm
net.md	40473	0644	edit dl rm
os.html	58658	0644	edit dl rm
os.json.gz	8576	0644	edit dl rm
os.md	34632	0644	edit dl rm
packages.html	65483	0644	edit dl rm
packages.json.gz	12401	0644	edit dl rm
packages.md	36538	0644	edit dl rm
path.html	39321	0644	edit dl rm
path.json.gz	4873	0644	edit dl rm
path.md	14750	0644	edit dl rm
perf_hooks.html	56215	0644	edit dl rm
perf_hooks.json.gz	6973	0644	edit dl rm
perf_hooks.md	20116	0644	edit dl rm
policy.html	15908	0644	edit dl rm
policy.json.gz	2908	0644	edit dl rm
policy.md	6324	0644	edit dl rm
process.html	169341	0644	edit dl rm
process.json.gz	27734	0644	edit dl rm
process.md	82162	0644	edit dl rm
punycode.html	16904	0644	edit dl rm
punycode.json.gz	1939	0644	edit dl rm
punycode.md	4063	0644	edit dl rm
querystring.html	19334	0644	edit dl rm
querystring.json.gz	2519	0644	edit dl rm
querystring.md	5423	0644	edit dl rm
readline.html	58434	0644	edit dl rm
readline.json.gz	8835	0644	edit dl rm
readline.md	25133	0644	edit dl rm
repl.html	54152	0644	edit dl rm
repl.json.gz	10053	0644	edit dl rm
repl.md	23754	0644	edit dl rm
report.html	44941	0644	edit dl rm
report.json.gz	6227	0644	edit dl rm
report.md	18287	0644	edit dl rm
stream.html	200501	0644	edit dl rm
stream.json.gz	34485	0644	edit dl rm
stream.md	98619	0644	edit dl rm
string_decoder.html	14415	0644	edit dl rm
string_decoder.json.gz	1545	0644	edit dl rm
string_decoder.md	2934	0644	edit dl rm
synopsis.html	11475	0644	edit dl rm
synopsis.json	3013	0644	edit dl rm
synopsis.md	2129	0644	edit dl rm
timers.html	27467	0644	edit dl rm
timers.json.gz	3637	0644	edit dl rm
timers.md	9738	0644	edit dl rm
tls.html	148381	0644	edit dl rm
tls.json.gz	29988	0644	edit dl rm
tls.md	81388	0644	edit dl rm
tracing.html	19586	0644	edit dl rm
tracing.json.gz	2829	0644	edit dl rm
tracing.md	6756	0644	edit dl rm
tty.html	26930	0644	edit dl rm
tty.json.gz	3758	0644	edit dl rm
tty.md	8989	0644	edit dl rm
url.html	97495	0644	edit dl rm
url.json.gz	13611	0644	edit dl rm
url.md	44869	0644	edit dl rm
util.html	178081	0644	edit dl rm
util.json.gz	20542	0644	edit dl rm
util.md	71255	0644	edit dl rm
v8.html	44688	0644	edit dl rm
v8.json.gz	6082	0644	edit dl rm
v8.md	15533	0644	edit dl rm
vm.html	103392	0644	edit dl rm
vm.json.gz	14023	0644	edit dl rm
vm.md	48293	0644	edit dl rm
wasi.html	17088	0644	edit dl rm
wasi.json.gz	2814	0644	edit dl rm
wasi.md	5932	0644	edit dl rm
worker_threads.html	70808	0644	edit dl rm
worker_threads.json.gz	11326	0644	edit dl rm
worker_threads.md	33883	0644	edit dl rm
zlib.html	90124	0644	edit dl rm
zlib.json.gz	10569	0644	edit dl rm
zlib.md	35697	0644	edit dl rm

Edit: /usr/share/doc/nodejs/api/tty.md (8989B)

# TTY

> Stability: 2 - Stable

The `tty` module provides the `tty.ReadStream` and `tty.WriteStream` classes.
In most cases, it will not be necessary or possible to use this module directly.
However, it can be accessed using:

```js
const tty = require('tty');
```

When Node.js detects that it is being run with a text terminal ("TTY")
attached, [`process.stdin`][] will, by default, be initialized as an instance of
`tty.ReadStream` and both [`process.stdout`][] and [`process.stderr`][] will, by
default be instances of `tty.WriteStream`. The preferred method of determining
whether Node.js is being run within a TTY context is to check that the value of
the `process.stdout.isTTY` property is `true`:

```console
$ node -p -e "Boolean(process.stdout.isTTY)"
true
$ node -p -e "Boolean(process.stdout.isTTY)" | cat
false
```

In most cases, there should be little to no reason for an application to
manually create instances of the `tty.ReadStream` and `tty.WriteStream`
classes.

## Class: `tty.ReadStream`

* Extends: {net.Socket}

Represents the readable side of a TTY. In normal circumstances
[`process.stdin`][] will be the only `tty.ReadStream` instance in a Node.js
process and there should be no reason to create additional instances.

### `readStream.isRaw`

A `boolean` that is `true` if the TTY is currently configured to operate as a
raw device. Defaults to `false`.

### `readStream.isTTY`

A `boolean` that is always `true` for `tty.ReadStream` instances.

### `readStream.setRawMode(mode)`

* `mode` {boolean} If `true`, configures the `tty.ReadStream` to operate as a
  raw device. If `false`, configures the `tty.ReadStream` to operate in its
  default mode. The `readStream.isRaw` property will be set to the resulting
  mode.
* Returns: {this} The read stream instance.

Allows configuration of `tty.ReadStream` so that it operates as a raw device.

When in raw mode, input is always available character-by-character, not
including modifiers. Additionally, all special processing of characters by the
terminal is disabled, including echoing input characters.
`CTRL`+`C` will no longer cause a `SIGINT` when in this mode.

## Class: `tty.WriteStream`

* Extends: {net.Socket}

Represents the writable side of a TTY. In normal circumstances,
[`process.stdout`][] and [`process.stderr`][] will be the only
`tty.WriteStream` instances created for a Node.js process and there
should be no reason to create additional instances.

### Event: `'resize'`

The `'resize'` event is emitted whenever either of the `writeStream.columns`
or `writeStream.rows` properties have changed. No arguments are passed to the
listener callback when called.

```js
process.stdout.on('resize', () => {
  console.log('screen size has changed!');
  console.log(`${process.stdout.columns}x${process.stdout.rows}`);
});
```

### `writeStream.clearLine(dir[, callback])`

* `dir` {number}
  * `-1`: to the left from cursor
  * `1`: to the right from cursor
  * `0`: the entire line
* `callback` {Function} Invoked once the operation completes.
* Returns: {boolean} `false` if the stream wishes for the calling code to wait
  for the `'drain'` event to be emitted before continuing to write additional
  data; otherwise `true`.

`writeStream.clearLine()` clears the current line of this `WriteStream` in a
direction identified by `dir`.

### `writeStream.clearScreenDown([callback])`

* `callback` {Function} Invoked once the operation completes.
* Returns: {boolean} `false` if the stream wishes for the calling code to wait
  for the `'drain'` event to be emitted before continuing to write additional
  data; otherwise `true`.

`writeStream.clearScreenDown()` clears this `WriteStream` from the current
cursor down.

### `writeStream.columns`

A `number` specifying the number of columns the TTY currently has. This property
is updated whenever the `'resize'` event is emitted.

### `writeStream.cursorTo(x[, y][, callback])`

* `x` {number}
* `y` {number}
* `callback` {Function} Invoked once the operation completes.
* Returns: {boolean} `false` if the stream wishes for the calling code to wait
  for the `'drain'` event to be emitted before continuing to write additional
  data; otherwise `true`.

`writeStream.cursorTo()` moves this `WriteStream`'s cursor to the specified
position.

### `writeStream.getColorDepth([env])`

* `env` {Object} An object containing the environment variables to check. This
  enables simulating the usage of a specific terminal. **Default:**
  `process.env`.
* Returns: {number}

Returns:

* `1` for 2,
* `4` for 16,
* `8` for 256,
* `24` for 16,777,216
colors supported.

Use this to determine what colors the terminal supports. Due to the nature of
colors in terminals it is possible to either have false positives or false
negatives. It depends on process information and the environment variables that
may lie about what terminal is used.
It is possible to pass in an `env` object to simulate the usage of a specific
terminal. This can be useful to check how specific environment settings behave.

To enforce a specific color support, use one of the below environment settings.

* 2 colors: `FORCE_COLOR = 0` (Disables colors)
* 16 colors: `FORCE_COLOR = 1`
* 256 colors: `FORCE_COLOR = 2`
* 16,777,216 colors: `FORCE_COLOR = 3`

Disabling color support is also possible by using the `NO_COLOR` and
`NODE_DISABLE_COLORS` environment variables.

### `writeStream.getWindowSize()`

* Returns: {number[]}

`writeStream.getWindowSize()` returns the size of the [TTY](tty.html)
corresponding to this `WriteStream`. The array is of the type
`[numColumns, numRows]` where `numColumns` and `numRows` represent the number
of columns and rows in the corresponding [TTY](tty.html).

### `writeStream.hasColors([count][, env])`

* `count` {integer} The number of colors that are requested (minimum 2).
  **Default:** 16.
* `env` {Object} An object containing the environment variables to check. This
  enables simulating the usage of a specific terminal. **Default:**
  `process.env`.
* Returns: {boolean}

Returns `true` if the `writeStream` supports at least as many colors as provided
in `count`. Minimum support is 2 (black and white).

This has the same false positives and negatives as described in
[`writeStream.getColorDepth()`][].

```js
process.stdout.hasColors();
// Returns true or false depending on if `stdout` supports at least 16 colors.
process.stdout.hasColors(256);
// Returns true or false depending on if `stdout` supports at least 256 colors.
process.stdout.hasColors({ TMUX: '1' });
// Returns true.
process.stdout.hasColors(2 ** 24, { TMUX: '1' });
// Returns false (the environment setting pretends to support 2 ** 8 colors).
```

### `writeStream.isTTY`

A `boolean` that is always `true`.

### `writeStream.moveCursor(dx, dy[, callback])`

* `dx` {number}
* `dy` {number}
* `callback` {Function} Invoked once the operation completes.
* Returns: {boolean} `false` if the stream wishes for the calling code to wait
  for the `'drain'` event to be emitted before continuing to write additional
  data; otherwise `true`.

`writeStream.moveCursor()` moves this `WriteStream`'s cursor *relative* to its
current position.

### `writeStream.rows`

A `number` specifying the number of rows the TTY currently has. This property
is updated whenever the `'resize'` event is emitted.

## `tty.isatty(fd)`

* `fd` {number} A numeric file descriptor
* Returns: {boolean}

The `tty.isatty()` method returns `true` if the given `fd` is associated with
a TTY and `false` if it is not, including whenever `fd` is not a non-negative
integer.

[`process.stderr`]: process.html#process_process_stderr
[`process.stdin`]: process.html#process_process_stdin
[`process.stdout`]: process.html#process_process_stdout
[`writeStream.getColorDepth()`]: #tty_writestream_getcolordepth_env

cmd: