Get stdout window width, with four fallbacks, tty, output.columns, a custom environment variable and then a default.

Tested against NodeJS v10+

Usage

npm install --save cli-width

"use strict";
 
const cliWidth = require("cli-width");
 
cliWidth(); // maybe 204 :) 

You can also set the CLI_WIDTH environment variable.

If none of the methods are supported, and the environment variable isn't set, the default width value is going to be 0, that can be changed using the configurable options.

API

cliWidth([options])

cliWidth can be configured using an options parameter, the possible properties are:

defaultWidth<number> Defines a default value to be used if none of the methods are available, defaults to 0
output<object> A stream to be used to read width values from, defaults to process.stdout
tty<object> TTY module to try to read width from as a fallback, defaults to ‘require('tty’)`

Examples

Defining both a default width value and a stream output to try to read from:

const cliWidth = require("cli-width");
const ttys = require("ttys");
 
cliWidth({
  defaultWidth: 80,
  output: ttys.output,
}); 

Defines a different tty module to read width from:

const cliWidth = require("cli-width");
const ttys = require("ttys");
 
cliWidth({
  tty: ttys,
}); 

Tests

npm install

npm test

Coverage can be generated with npm run coverage.