Table of Contents

• TTY

  • Class: tty.ReadStream

    • readStream.isRaw
    • readStream.isTTY
    • readStream.setRawMode(mode)

  • Class: tty.WriteStream

    • Event: 'resize'
    • writeStream.clearLine(dir)
    • writeStream.clearScreenDown()
    • writeStream.columns
    • writeStream.cursorTo(x, y)
    • writeStream.getColorDepth([env])
    • writeStream.getWindowSize()
    • writeStream.hasColors([count][, env])
    • writeStream.isTTY
    • writeStream.moveCursor(dx, dy)
    • writeStream.rows
  • tty.isatty(fd)

TTY#

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:

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:

$ 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[src]#

The tty.ReadStream class is a subclass of net.Socket that 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