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readme.md
supports-color
Detect whether a terminal supports color
Install
$ npm install supports-color
Usage
const supportsColor = require('supports-color');
if (supportsColor.stdout) {
console.log('Terminal stdout supports color');
}
if (supportsColor.stdout.has256) {
console.log('Terminal stdout supports 256 colors');
}
if (supportsColor.stderr.has16m) {
console.log('Terminal stderr supports 16 million colors (truecolor)');
}
API
Returns an Object
with a stdout
and stderr
property for testing either streams. Each property is an Object
, or false
if color is not supported.
The stdout
/stderr
objects specifies a level of support for color through a .level
property and a corresponding flag:
.level = 1
and.hasBasic = true
: Basic color support (16 colors).level = 2
and.has256 = true
: 256 color support.level = 3
and.has16m = true
: Truecolor support (16 million colors)
require('supports-color').supportsColor(stream, options?)
Additionally, supports-color
exposes the .supportsColor()
function that takes an arbitrary write stream (e.g. process.stdout
) and an optional options object to (re-)evaluate color support for an arbitrary stream.
For example, require('supports-color').stdout
is the equivalent of require('supports-color').supportsColor(process.stdout)
.
The options object supports a single boolean property sniffFlags
. By default it is true
, which instructs supportsColor()
to sniff process.argv
for the multitude of --color
flags (see Info below). If false
, then process.argv
is not considered when determining color support.
Info
It obeys the --color
and --no-color
CLI flags.
For situations where using --color
is not possible, use the environment variable FORCE_COLOR=1
(level 1), FORCE_COLOR=2
(level 2), or FORCE_COLOR=3
(level 3) to forcefully enable color, or FORCE_COLOR=0
to forcefully disable. The use of FORCE_COLOR
overrides all other color support checks.
Explicit 256/Truecolor mode can be enabled using the --color=256
and --color=16m
flags, respectively.
Related
- supports-color-cli - CLI for this module
- chalk - Terminal string styling done right
Maintainers
Tidelift helps make open source sustainable for maintainers while giving companies
assurances about security, maintenance, and licensing for their dependencies.